codegen/template_bundle/template_files.go

// Code generated by go-bindata.
// sources:
// codegen/templates/augmented_mock.tmpl
// codegen/templates/clientless-workflow.tmpl
// codegen/templates/dependency_struct.tmpl
// codegen/templates/endpoint.tmpl
// codegen/templates/endpoint_collection.tmpl
// codegen/templates/endpoint_test.tmpl
// codegen/templates/endpoint_test_tchannel_client.tmpl
// codegen/templates/fixture_types.tmpl
// codegen/templates/grpc_client.tmpl
// codegen/templates/http_client.tmpl
// codegen/templates/http_client_test.tmpl
// codegen/templates/main.tmpl
// codegen/templates/main_test.tmpl
// codegen/templates/middleware_http.tmpl
// codegen/templates/middleware_tchannel.tmpl
// codegen/templates/module_class_initializer.tmpl
// codegen/templates/module_initializer.tmpl
// codegen/templates/module_mock_initializer.tmpl
// codegen/templates/service.tmpl
// codegen/templates/service_mock.tmpl
// codegen/templates/structs.tmpl
// codegen/templates/tchannel_client.tmpl
// codegen/templates/tchannel_client_test_server.tmpl
// codegen/templates/tchannel_endpoint.tmpl
// codegen/templates/workflow.tmpl
// codegen/templates/workflow_mock.tmpl
// codegen/templates/workflow_mock_clients_type.tmpl
// DO NOT EDIT!

package templates

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"
	"time"
)

type asset struct {
	bytes []byte
	info  os.FileInfo
}

type bindataFileInfo struct {
	name    string
	size    int64
	mode    os.FileMode
	modTime time.Time
}

func (fi bindataFileInfo) Name() string {
	return fi.name
}
func (fi bindataFileInfo) Size() int64 {
	return fi.size
}
func (fi bindataFileInfo) Mode() os.FileMode {
	return fi.mode
}
func (fi bindataFileInfo) ModTime() time.Time {
	return fi.modTime
}
func (fi bindataFileInfo) IsDir() bool {
	return false
}
func (fi bindataFileInfo) Sys() interface{} {
	return nil
}

var _augmented_mockTmpl = []byte(`{{- /* template to render client mock code for custom client */ -}}
{{- $methods := .Methods}}
{{- $fixturePkg := .Fixture.ImportPath -}}
{{- $scenarios := .Fixture.Scenarios -}}
{{- $clientinterface := .ClientInterface}}

package clientmock

import (
	"github.com/golang/mock/gomock"
)

// Mock{{$clientinterface}}WithFixture is a mock of Client interface with preset fixture
type Mock{{$clientinterface}}WithFixture struct {
	*Mock{{$clientinterface}}
	fixture *ClientFixture

	{{range $method := $methods}}
	{{$methodName := $method.Name -}}
	{{$methodMockType := printf "%sMock" $methodName -}}
	{{camel $methodMockType}} *{{$methodMockType}}
	{{- end}}
}

// Call is a thin wrapper around gomock.Call for exposing the methods that do not mutate the fixture related information
// like Return().
type Call struct {
	call *gomock.Call
}

// MaxTimes marks a fixture as callable up to a maximum number of times.
func (c Call) MaxTimes(max int) {
	c.call.MaxTimes(max)
}

// MinTimes marks a fixture as must be called a minimum number of times.
func (c Call) MinTimes(min int) {
	c.call.MinTimes(min)
}

// New creates a new mock instance
func New(ctrl *gomock.Controller, fixture *ClientFixture) *Mock{{$clientinterface}}WithFixture {
	return &Mock{{$clientinterface}}WithFixture{
		Mock{{$clientinterface}}: NewMock{{$clientinterface}}(ctrl),
		fixture:    fixture,
	}
}

// EXPECT shadows the EXPECT method on the underlying mock client.
// It should not be called directly.
func (m *Mock{{$clientinterface}}WithFixture) EXPECT() {
	panic("should not call EXPECT directly.")
}


{{range $method := $methods}}
{{$methodName := $method.Name -}}
{{$methodMockType := printf "%sMock" $methodName -}}
{{$methodMockField := camel $methodMockType -}}
{{$methodScenarios := index $scenarios $methodName -}}
// {{$methodMockType}} mocks the {{$methodName}} method
type {{$methodMockType}} struct {
	scenarios  *{{$methodName}}Scenarios
	mockClient *Mock{{$clientinterface}}
}
{{$methodMockMethod := printf "Expect%s" $methodName -}}
// {{$methodMockMethod}} returns an object that allows the caller to choose expected scenario for {{$methodName}}
func (m *Mock{{$clientinterface}}WithFixture) {{$methodMockMethod}}() *{{$methodMockType}} {
	if m.{{$methodMockField}} == nil {
		m.{{$methodMockField}} = &{{$methodMockType}}{
			scenarios:  m.fixture.{{$methodName}},
			mockClient: m.Mock{{$clientinterface}},
		}
	}
	return m.{{$methodMockField}}
}

{{- range $scenario := $methodScenarios -}}
{{$scenarioMethod := pascal $scenario}}
// {{$scenarioMethod}} sets the expected scenario as defined in the concrete fixture package
// {{$fixturePkg}}
func (s *{{$methodMockType}}) {{$scenarioMethod}}() Call {
	f := s.scenarios.{{$scenarioMethod}}

	{{range $argName, $argType := $method.In}}
	var {{$argName}} interface{}
	{{$argName}} = f.{{title $argName}}
	if f.{{title $argName}}Any {
		{{$argName}} = gomock.Any()
	}
	{{- end}}
	{{- if $method.Variadic}}
	var {{$method.Variadic}} []interface{}
	if f.{{title $method.Variadic}} != nil {
		for _, v := range f.{{title $method.Variadic}} {
			{{$method.Variadic}} = append({{$method.Variadic}}, v)
		}
	} else if f.{{title $method.Variadic}}Any > 0 {
		for i := 0; i < f.{{title $method.Variadic}}Any; i++ {
			{{$method.Variadic}} = append({{$method.Variadic}}, gomock.Any())
		}
	}
	{{- end}}

	{{range $retName, $retType := $method.Out}}
	{{$retName}} := f.{{title $retName}}
	{{- end}}

	return Call{call: s.mockClient.EXPECT().{{$methodName}}({{$method.InString}}{{if $method.Variadic}}, {{$method.Variadic}}...{{end}}).Return({{$method.OutString}})}
}
{{- end -}}
{{- end -}}
`)

func augmented_mockTmplBytes() ([]byte, error) {
	return _augmented_mockTmpl, nil
}

func augmented_mockTmpl() (*asset, error) {
	bytes, err := augmented_mockTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "augmented_mock.tmpl", size: 3627, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _clientlessWorkflowTmpl = []byte(`{{/* template to render gateway workflow interface code */ -}}
{{- $instance := .Instance }}
package clientlessworkflow

{{- $endpointType := .Spec.EndpointType }}
{{- $reqHeaderMap := .ReqHeaders }}
{{- $reqHeaderMapKeys := .ReqHeadersKeys }}
{{- $reqHeaderRequiredKeys := .ReqRequiredHeadersKeys }}
{{- $resHeaderMap := .ResHeaders }}
{{- $resHeaderMapKeys := .ResHeadersKeys }}
{{- $clientlessEndpoint := .IsClientlessEndpoint }}
{{- $clientID := .ClientID }}
{{- $clientName := title .ClientName }}
{{- $clientType := .ClientType }}
{{- $clientMethodName := title .ClientMethodName }}
{{- $serviceMethod := printf "%s%s" (title .Method.ThriftService) (title .Method.Name) }}
{{- $workflowInterface := printf "%sWorkflow" $serviceMethod }}
{{- $workflowStruct := camel $workflowInterface }}
{{- $method := .Method }}

import (
	"context"
	"net/textproto"
	"github.com/uber/zanzibar/config"

	zanzibar "github.com/uber/zanzibar/runtime"

	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end -}}

	{{if .Method.Downstream }}
	{{- range $idx, $pkg := .Method.Downstream.IncludedPackages -}}
	{{$file := basePath $pkg.PackageName -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
	{{- end}}

	"go.uber.org/zap"
	module "{{$instance.PackageInfo.ModulePackagePath}}"
)

{{with .Method -}}
// {{$workflowInterface}} defines the interface for {{$serviceMethod}} workflow
type {{$workflowInterface}} interface {
Handle(
{{- if and (eq .RequestType "") (eq .ResponseType "") }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
) (context.Context, zanzibar.Header, error)
{{else if eq .RequestType "" }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
) (context.Context, {{.ResponseType}}, zanzibar.Header, error)
{{else if eq .ResponseType "" }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
	r {{.RequestType}},
) (context.Context, zanzibar.Header, error)
{{else}}
	ctx context.Context,
	reqHeaders zanzibar.Header,
	r {{.RequestType}},
) (context.Context, {{.ResponseType}}, zanzibar.Header, error)
{{- end}}
}

{{end -}}


{{- with .Method -}}
{{- $methodName := title .Name }}


// New{{$workflowInterface}} creates a workflow
func New{{$workflowInterface}}(deps *module.Dependencies) {{$workflowInterface}} {

	return &{{$workflowStruct}}{
		Logger:  deps.Default.Logger,
	}
}

// {{$workflowStruct}} calls thrift client {{$clientName}}.{{$clientMethodName}}
type {{$workflowStruct}} struct {
	Logger  *zap.Logger
}

// Handle processes the request without a downstream
func (w {{$workflowStruct}}) Handle(
{{- if and (eq .RequestType "") (eq .ResponseType "") }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
) (context.Context, zanzibar.Header, error) {
{{else if eq .RequestType "" }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
) (context.Context, {{.ResponseType}}, zanzibar.Header, error) {
{{else if eq .ResponseType "" }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
	r {{.RequestType}},
) (context.Context, zanzibar.Header, error) {
{{else}}
	ctx context.Context,
	reqHeaders zanzibar.Header,
	r {{.RequestType}},
) (context.Context, {{.ResponseType}}, zanzibar.Header, error) {
{{- end}}

	{{- if ne .ResponseType "" -}}
	response := convert{{$methodName}}DummyResponse(r)
	{{end}}

	clientlessHeaders := map[string]string{}
	{{if (ne (len $reqHeaderMapKeys) 0) }}
	var ok bool
	var h string
	{{- end -}}
	{{range $i, $k := $reqHeaderMapKeys}}
	h, ok = reqHeaders.Get("{{$k}}")
	if ok {
		{{- $typedHeader := index $reqHeaderMap $k -}}
		clientlessHeaders["{{$typedHeader.TransformTo}}"] = h
	}
	{{- end}}

	// Filter and map response headers from client to server response.
	{{if eq $endpointType "tchannel" -}}
	resHeaders := zanzibar.ServerTChannelHeader{}
	{{- else -}}
	resHeaders := zanzibar.ServerHTTPHeader{}
	{{- end -}}

	{{range $i, $k := $resHeaderMapKeys}}
	{{- $resHeaderVal := index $resHeaderMap $k}}
	h, ok = clientlessHeaders["{{$k}}"]
	if ok {
		resHeaders.Set("{{$resHeaderVal.TransformTo}}", h)
	}
	{{- end}}

	{{if eq .ResponseType "" -}}
	return ctx, resHeaders, nil
	{{- else -}}

	resHeaders.Set(zanzibar.ClientTypeKey, "{{$clientType}}")
	return ctx, response, resHeaders, nil
	{{end}}

	{{- end -}}
}

{{if eq $clientlessEndpoint true -}}
{{ range $key, $line := $method.ConvertClientlessRequestGoStatements -}}
{{$line}}
{{ end }}
{{end -}}

`)

func clientlessWorkflowTmplBytes() ([]byte, error) {
	return _clientlessWorkflowTmpl, nil
}

func clientlessWorkflowTmpl() (*asset, error) {
	bytes, err := clientlessWorkflowTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "clientless-workflow.tmpl", size: 4355, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _dependency_structTmpl = []byte(`{{$instance := . -}}
package module

import (
	{{range $classType, $moduleInstances := $instance.ResolvedDependencies -}}
	{{range $idx, $moduleInstance := $moduleInstances -}}
	{{$moduleInstance.PackageInfo.ImportPackageAlias}} "{{$moduleInstance.PackageInfo.ImportPackagePath}}"
	{{end -}}
	{{end}}

	zanzibar "github.com/uber/zanzibar/runtime"
)

// Dependencies contains dependencies for the {{$instance.InstanceName}} {{$instance.ClassName}} module
type Dependencies struct {
	Default *zanzibar.DefaultDependencies
	{{range $classType, $moduleInstances := $instance.ResolvedDependencies -}}
	{{$classType | pascal}} *{{$classType | pascal}}Dependencies
	{{end -}}
}

{{range $classType, $moduleInstances := $instance.ResolvedDependencies -}}
// {{$classType | pascal}}Dependencies contains {{$classType}} dependencies
type {{$classType | pascal}}Dependencies struct {
	{{ range $idx, $dependency := $moduleInstances -}}
	{{- /* TODO: the dependency type should cover all types instead of just interface type */ -}}
	{{$dependency.PackageInfo.QualifiedInstanceName}} {{$dependency.PackageInfo.ImportPackageAlias}}.{{$dependency.PackageInfo.ExportType}}
	{{end -}}
}
{{end -}}
`)

func dependency_structTmplBytes() ([]byte, error) {
	return _dependency_structTmpl, nil
}

func dependency_structTmpl() (*asset, error) {
	bytes, err := dependency_structTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "dependency_struct.tmpl", size: 1180, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _endpointTmpl = []byte(`{{/* template to render gateway http endpoint code */ -}}
{{- $instance := .Instance }}
package {{$instance.PackageInfo.PackageName}}

{{- $reqHeaderMap := .ReqHeaders }}
{{- $reqHeaderMapKeys := .ReqHeadersKeys }}
{{- $reqHeaderRequiredKeys := .ReqRequiredHeadersKeys }}
{{- $resHeaderMap := .ResHeaders }}
{{- $resHeaderMapKeys := .ResHeadersKeys }}
{{- $resHeaderRequiredKeys := .ResRequiredHeadersKeys }}
{{- $clientName := title .ClientName }}
{{- $serviceMethod := printf "%s%s" (title .Method.ThriftService) (title .Method.Name) }}
{{- $handlerName := printf "%sHandler" $serviceMethod }}
{{- $clientMethodName := title .ClientMethodName }}
{{- $endpointId := .Spec.EndpointID }}
{{- $handleId := .Spec.HandleID }}
{{- $middlewares := .Spec.Middlewares }}
{{- $workflowPkg := .WorkflowPkg }}
{{- $workflowInterface := printf "%sWorkflow" $serviceMethod }}
{{- $traceKey := .TraceKey }}

import (
	"context"
	"runtime/debug"
	"encoding/json"
	"io/ioutil"
	"net/http"

	"github.com/opentracing/opentracing-go"
	"github.com/pkg/errors"
	"go.uber.org/thriftrw/ptr"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
	zanzibar "github.com/uber/zanzibar/runtime"

	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end -}}

	{{if .Method.Downstream }}
	{{- range $idx, $pkg := .Method.Downstream.IncludedPackages -}}
	{{$file := basePath $pkg.PackageName -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
	{{- end}}

	{{- if len $middlewares | ne 0 }}
	{{- range $idx, $middleware := $middlewares }}
	{{$middleware.Name | camel}} "{{$middleware.ImportPath}}"
	{{- end}}
	{{- end}}

	module "{{$instance.PackageInfo.ModulePackagePath}}"
)

{{with .Method -}}

// {{$handlerName}} is the handler for "{{.HTTPPath}}"
type {{$handlerName}} struct {
	Dependencies  *module.Dependencies
	endpoint      *zanzibar.RouterEndpoint
}

// New{{$handlerName}} creates a handler
func New{{$handlerName}}(deps *module.Dependencies) *{{$handlerName}} {
	handler := &{{$handlerName}}{
		Dependencies: deps,
	}
	handler.endpoint = zanzibar.NewRouterEndpoint(
		deps.Default.ContextExtractor, deps.Default,
		"{{$endpointId}}", "{{$handleId}}",
		{{ if len $middlewares | ne 0 -}}
		zanzibar.NewStack([]zanzibar.MiddlewareHandle{
			{{range $idx, $middleware := $middlewares -}}
			deps.Middleware.{{$middleware.Name | pascal}}.NewMiddlewareHandle(
				{{$middleware.Name | camel}}.Options{
				{{range $key, $value := $middleware.PrettyOptions -}}
					{{$key}} : {{$value}},
				{{end -}}
				},
			),
			{{end -}}
		}, handler.HandleRequest).Handle,
		{{- else -}}
		handler.HandleRequest,
		{{- end}}
	)

	return handler
}

// Register adds the http handler to the gateway's http router
func (h *{{$handlerName}}) Register(g *zanzibar.Gateway) error {
	return g.HTTPRouter.Handle(
		"{{.HTTPMethod}}", "{{.HTTPPath}}",
		http.HandlerFunc(h.endpoint.HandleRequest),
	)
}

// HandleRequest handles "{{.HTTPPath}}".
func (h *{{$handlerName}}) HandleRequest(
	ctx context.Context,
	req *zanzibar.ServerHTTPRequest,
	res *zanzibar.ServerHTTPResponse,
) context.Context {
	defer func() {
		if r := recover(); r != nil {
			stacktrace := string(debug.Stack())
			e := errors.Errorf("enpoint panic: %v, stacktrace: %v", r, stacktrace)
			ctx = h.Dependencies.Default.ContextLogger.ErrorZ(
				ctx,
				"Endpoint failure: endpoint panic",
				zap.Error(e),
				zap.String("stacktrace", stacktrace))

			h.Dependencies.Default.ContextMetrics.IncCounter(ctx, zanzibar.MetricEndpointPanics, 1)
			res.SendError(502, "Unexpected workflow panic, recovered at endpoint.", nil)
		}
	}()

	{{ if $reqHeaderRequiredKeys -}}
	if !req.CheckHeaders({{$reqHeaderRequiredKeys | printf "%#v" }}) {
		return ctx
	}
	{{- end -}}

	{{if ne .RequestType ""}}
	var requestBody {{unref .RequestType}}

	{{- if ne .HTTPMethod "GET"}}
	if ok := req.ReadAndUnmarshalBody(&requestBody); !ok {
		return ctx
	}
	{{end}}

	{{range $index, $line := .RequestParamGoStatements -}}
	{{$line}}
	{{end}}

	{{end}}

	{{range $index, $line := .ReqHeaderGoStatements -}}
	{{$line}}
	{{end}}

	{{range $index, $line := .ParseQueryParamGoStatements -}}
	{{$line}}
	{{end}}

	// log endpoint request to downstream services
	if ce := h.Dependencies.Default.ContextLogger.Check(zapcore.DebugLevel, "stub"); ce != nil {
		var zfields []zapcore.Field
		{{- if ne .RequestType ""}}
		zfields = append(zfields, zap.String("body", fmt.Sprintf("%s", req.GetRawBody())))
		{{- end}}
		for _, k := range req.Header.Keys() {
			if val, ok := req.Header.Get(k); ok {
				zfields = append(zfields, zap.String(k, val))
			}
		}
		ctx = h.Dependencies.Default.ContextLogger.DebugZ(ctx, "endpoint request to downstream", zfields...)
	}

	w := {{$workflowPkg}}.New{{$workflowInterface}}(h.Dependencies)
	if span := req.GetSpan(); span != nil {
		ctx = opentracing.ContextWithSpan(ctx, span)
	}

	{{if and (eq .RequestType "") (eq .ResponseType "")}}
	ctx, cliRespHeaders, err := w.Handle(ctx, req.Header)
	{{else if eq .RequestType ""}}
	ctx, response, cliRespHeaders, err := w.Handle(ctx, req.Header)
	{{else if eq .ResponseType ""}}
	ctx, cliRespHeaders, err := w.Handle(ctx, req.Header, &requestBody)
	{{else}}
	ctx, response, cliRespHeaders, err := w.Handle(ctx, req.Header, &requestBody)

	// log downstream response to endpoint
	if ce := h.Dependencies.Default.ContextLogger.Check(zapcore.DebugLevel, "stub"); ce != nil {
		var zfields []zapcore.Field
		{{- if ne .ResponseType ""}}
		if body, err := json.Marshal(response); err == nil {
			zfields = append(zfields, zap.String("body", fmt.Sprintf("%s", body)))
		}
		{{- end}}
		if cliRespHeaders != nil {
			for _, k := range cliRespHeaders.Keys() {
				if val, ok := cliRespHeaders.Get(k); ok {
					zfields = append(zfields, zap.String(k, val))
				}
			}
		}
		if traceKey, ok := req.Header.Get("{{$traceKey}}"); ok {
			zfields = append(zfields, zap.String("{{$traceKey}}", traceKey))
		}
		ctx = h.Dependencies.Default.ContextLogger.DebugZ(ctx, "downstream service response", zfields...)
	}
	{{end -}}

	// map useful client response headers to server response
	if cliRespHeaders != nil {
		if val, ok := cliRespHeaders.Get(zanzibar.ClientResponseDurationKey); ok {
			if duration, err := time.ParseDuration(val); err == nil {
				res.DownstreamFinishTime = duration
			}
			cliRespHeaders.Unset(zanzibar.ClientResponseDurationKey)
		}
		if val, ok := cliRespHeaders.Get(zanzibar.ClientTypeKey); ok {
			res.ClientType = val
			cliRespHeaders.Unset(zanzibar.ClientTypeKey)
		}
	}

	if err != nil {
		{{- if eq (len .Exceptions) 0 -}}
		res.SendError(500, "Unexpected server error", err)
		return ctx
		{{ else }}
		{{$val := false}}
		{{range $idx, $exception := .Exceptions}}
			{{if not $exception.IsBodyDisallowed}}
				{{$val = true}}
			{{ end}}
		{{end}}
		{{ if $val -}}
		switch errValue := err.(type) {
		{{else -}}
		switch err.(type) {
		{{end -}}
		{{range $idx, $exception := .Exceptions}}
		case *{{$exception.Type}}:
			{{if $exception.IsBodyDisallowed -}}
			res.WriteJSONBytes({{$exception.StatusCode.Code}}, cliRespHeaders, nil)
			{{else -}}
			res.WriteJSON(
				{{$exception.StatusCode.Code}}, cliRespHeaders, errValue,
			)
			{{end -}}
			return ctx
		{{end}}
			default:
				res.SendError(500, "Unexpected server error", err)
				return ctx
		}
		{{ end }}
	}

	{{if eq .ResponseType "" -}}
	res.WriteJSONBytes({{.OKStatusCode.Code}}, cliRespHeaders, nil)
	{{- else if eq .ResponseType "string" -}}
	bytes, err := json.Marshal(response)
	if err != nil {
		res.SendError(500, "Unexpected server error", errors.Wrap(err, "Unable to marshal resp json"))
		return ctx
	}
	res.WriteJSONBytes({{.OKStatusCode.Code}}, cliRespHeaders, bytes)
	{{- else -}}
	res.WriteJSON({{.OKStatusCode.Code}}, cliRespHeaders, response)
	{{- end }}
	return ctx
}

{{end -}}
`)

func endpointTmplBytes() ([]byte, error) {
	return _endpointTmpl, nil
}

func endpointTmpl() (*asset, error) {
	bytes, err := endpointTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "endpoint.tmpl", size: 7798, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _endpoint_collectionTmpl = []byte(`{{- $instance := .Instance -}}
{{- $endpointMeta := .EndpointMeta -}}

package {{$instance.PackageInfo.PackageName}}

import (
	module "{{$instance.PackageInfo.ModulePackagePath}}"
	zanzibar "github.com/uber/zanzibar/runtime"
)

// Endpoint registers a request handler on a gateway
type Endpoint interface{
	Register(*zanzibar.Gateway) error
}

// NewEndpoint returns a collection of endpoints that can be registered on
// a gateway
func NewEndpoint(deps *module.Dependencies) Endpoint {
	return &EndpointHandlers{
		{{- range $idx, $meta := $endpointMeta }}
		{{$serviceMethod := printf "%s%s" (title .Method.ThriftService) (title .Method.Name) -}}
		{{$handlerName := printf "%sHandler"  $serviceMethod -}}
		{{$handlerName}}: New{{$handlerName}}(deps),
		{{- end}}
	}
}


// EndpointHandlers is a collection of individual endpoint handlers
type EndpointHandlers struct {
	{{- range $idx, $meta := $endpointMeta }}
	{{$serviceMethod := printf "%s%s" (title $meta.Method.ThriftService) (title $meta.Method.Name) -}}
	{{$handlerName := printf "%sHandler"  $serviceMethod -}}
	{{$handlerName}} *{{$handlerName}}
	{{- end}}
}

// Register registers the endpoint handlers with the gateway
func (handlers *EndpointHandlers) Register(gateway *zanzibar.Gateway) error {
	{{- range $idx, $meta := $endpointMeta }}
	{{$serviceMethod := printf "%s%s" (title .Method.ThriftService) (title .Method.Name) -}}
	{{$handlerName := printf "%sHandler"  $serviceMethod -}}
	err{{$idx}} := handlers.{{$handlerName}}.Register(gateway)
	if err{{$idx}} != nil {
		return err{{$idx}}
	}
	{{- end}}
	return nil
}


`)

func endpoint_collectionTmplBytes() ([]byte, error) {
	return _endpoint_collectionTmpl, nil
}

func endpoint_collectionTmpl() (*asset, error) {
	bytes, err := endpoint_collectionTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "endpoint_collection.tmpl", size: 1591, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _endpoint_testTmpl = []byte(`{{/* template to render gateway http endpoint tests */ -}}
{{- $instance := .Instance }}
package {{$instance.PackageInfo.PackageName}}

import (
	"bytes"
	"path/filepath"
	"net/http"
	"testing"
	"runtime"

	"github.com/stretchr/testify/assert"
	"github.com/uber/zanzibar/test/lib/bench_gateway"
	testBackend "github.com/uber/zanzibar/test/lib/test_backend"
	testGateway "github.com/uber/zanzibar/test/lib/test_gateway"
)

{{- $clientID := .ClientID }}
{{- $relativePathToRoot := .RelativePathToRoot}}
{{- $headers := .ReqHeaders }}
{{with .Method -}}
{{- $clientPackage := .Downstream.PackageName -}}
{{- $clientMethod := .DownstreamMethod -}}
{{- $clientMethodName := $clientMethod.Name | title -}}
{{- $clientMethodRequestType := fullTypeName  ($clientMethod).RequestType ($clientPackage) -}}
{{- $clientMethodResponseType := fullTypeName  ($clientMethod).ResponseType ($clientPackage) -}}


{{range $testName, $testFixture := $.TestFixtures}}

func getDirName{{$testFixture.HandleID | title}}{{$testFixture.TestName | title}}() string {
	_, file, _, _ := runtime.Caller(0)

	return filepath.Dir(file)
}

func Test{{$testFixture.HandleID | title}}{{$testFixture.TestName | title}}OKResponse(t *testing.T) {
	var counter int

	gateway, err := testGateway.CreateGateway(t, nil, &testGateway.Options{
		KnownHTTPBackends: []string{"{{$clientID}}"},
		TestBinary: filepath.Join(
			getDirName{{$testFixture.HandleID | title}}{{$testFixture.TestName | title}}(),
			"{{$relativePathToRoot}}",
			"build", "services", "{{$testFixture.TestServiceName}}",
			"main", "main.go",
		),
		ConfigFiles: []string{
			filepath.Join(
				getDirName{{$testFixture.HandleID | title}}{{$testFixture.TestName | title}}(),
				"{{$relativePathToRoot}}",
				"config", "test.yaml",
			),
			filepath.Join(
				getDirName{{$testFixture.HandleID | title}}{{$testFixture.TestName | title}}(),
				"{{$relativePathToRoot}}",
				"config", "{{$testFixture.TestServiceName}}", "test.yaml",
			),
		},
	})
	if !assert.NoError(t, err, "got bootstrap err") {
		return
	}
	defer gateway.Close()

	{{range $clientCallName, $clientCallFixture := $testFixture.ClientTestFixtures}}
	fake{{$clientCallFixture.ClientMethod | title}} := func(w http.ResponseWriter, r *http.Request) {

		{{range $k, $v := $clientCallFixture.ClientReqHeaders -}}
		assert.Equal(
			t,
			"{{$v}}",
			r.Header.Get("{{$k}}"))
		{{end}}

		{{range $k, $v := $clientCallFixture.ClientResHeaders -}}
		w.Header().Set("{{$k}}", "{{$v}}")
		{{end}}
		w.WriteHeader({{$.Method.OKStatusCode.Code}})

		{{ if $clientCallFixture.ClientResponse.Body -}}
		payload := []byte({{printf "` + "`" + `%s` + "`" + `" $clientCallFixture.ClientResponse.Body}})
		{{else}}
		var payload []byte
		{{- end}}

		// TODO(zw): generate client response.
		if _, err := w.Write(payload); err != nil {
			t.Fatal("can't write fake response")
		}
		counter++
	}

	gateway.HTTPBackends()["{{$clientID}}"].HandleFunc(
		"{{$clientMethod.HTTPMethod}}", "{{$clientMethod.HTTPPath}}", fake{{$clientCallFixture.ClientMethod | title}},
	)

	{{end -}}

	headers := map[string]string{}
	{{ if $headers -}}
	{{range $k, $v := $testFixture.EndpointReqHeaders -}}
	headers["{{$k}}"] = "{{$v}}"
	{{end}}
	{{- end}}

	{{ if $testFixture.EndpointRequest.Body -}}
	endpointRequest := []byte({{printf "` + "`" + `%s` + "`" + `" $testFixture.EndpointRequest.Body}})
	{{else}}
	endpointRequest := []byte(` + "`" + `{}` + "`" + `)
	{{- end}}

	res, err := gateway.MakeRequest(
		"{{$.Method.HTTPMethod}}",
		"{{$.Method.HTTPPath}}",
		headers,
		bytes.NewReader(endpointRequest),
	)
	if !assert.NoError(t, err, "got http error") {
		return
	}

	assert.Equal(t, {{$.Method.OKStatusCode.Code}}, res.StatusCode)
	{{range $k, $v := $testFixture.EndpointResHeaders -}}
	assert.Equal(
		t,
		"{{$v}}",
		res.Header.Get("{{$k}}"))
	{{end}}
	assert.Equal(t, 1, counter)
}

{{end -}}
{{end -}}
`)

func endpoint_testTmplBytes() ([]byte, error) {
	return _endpoint_testTmpl, nil
}

func endpoint_testTmpl() (*asset, error) {
	bytes, err := endpoint_testTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "endpoint_test.tmpl", size: 3820, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _endpoint_test_tchannel_clientTmpl = []byte(`{{/* template to render gateway http endpoint tests */}}
{{- $instance := .Instance }}
package {{$instance.PackageInfo.PackageName}}

import (
	"bytes"
	"context"
	{{if .Method.DownstreamMethod.ResponseType -}}
	"encoding/json"
	{{end -}}
	"path/filepath"
	"testing"
	"strconv"
	{{if ne .Method.ResponseType "" -}}
	"io/ioutil"
	{{end}}

	"github.com/stretchr/testify/assert"
	testGateway "github.com/uber/zanzibar/test/lib/test_gateway"
	"github.com/uber/zanzibar/test/lib/util"
	"github.com/uber/zanzibar/config"
	testbackend "github.com/uber/zanzibar/test/lib/test_backend"

	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
)

{{- $clientName := camel .ClientName -}}
{{- $headers := .ReqHeaders }}

{{with .Method -}}
{{- $responseType := .ResponseType -}}
{{- $clientPackage := .Downstream.PackageName -}}
{{- $thriftService := .DownstreamMethod.ThriftService -}}
{{- $clientMethod := .DownstreamMethod -}}
{{- $clientMethodName := $clientMethod.Name -}}
{{- $clientMethodRequestType := fullTypeName  ($clientMethod).RequestType ($clientPackage) -}}
{{- $clientMethodResponseType := fullTypeName  ($clientMethod).ResponseType ($clientPackage) -}}

{{range $testName, $testFixture := $.TestFixtures}}
func Test{{title $testFixture.HandleID}}{{title $testFixture.TestName}}OKResponse(t *testing.T) {

	confFiles := util.DefaultConfigFiles("{{$testFixture.TestServiceName}}")
	staticConf := config.NewRuntimeConfigOrDie(confFiles, map[string]interface{}{})
	var alternateServiceDetail config.AlternateServiceDetail
	if staticConf.ContainsKey("clients.{{$clientName}}.alternates") {
		staticConf.MustGetStruct("clients.{{$clientName}}.alternates", &alternateServiceDetail)
	}
	var backends []*testbackend.TestTChannelBackend
	for serviceName := range alternateServiceDetail.ServicesDetailMap {
		if serviceName == "nomatch" {
			continue
		}
		backend, err := testbackend.CreateTChannelBackend(int32(0), serviceName)
		assert.NoError(t, err)
		err = backend.Bootstrap()
		assert.NoError(t, err)
		backends = append(backends, backend)
	}

	gateway, err := testGateway.CreateGateway(t, map[string]interface{}{
		{{/* the serviceName here is service discovery name, therefore is ok to be arbitrary */ -}}
		"clients.{{$clientName}}.serviceName": "{{$clientName}}Service",
	}, &testGateway.Options{
	KnownTChannelBackends: []string{"{{$clientName}}"},
		TestBinary:            util.DefaultMainFile("{{$testFixture.TestServiceName}}"),
		ConfigFiles:           confFiles,
		Backends:              backends,
	})
	if !assert.NoError(t, err, "got bootstrap err") {
		return
	}
	defer gateway.Close()

	{{range $clientCallName, $clientCallFixture := $testFixture.ClientTestFixtures}}
	{{$clientFunc := printf "fake%s" (title $clientCallFixture.ClientMethod) -}}
	{{$clientFunc}} := func(
		ctx context.Context,
		reqHeaders map[string]string,
		{{if $clientMethod.RequestType -}}
		args {{$clientMethodRequestType}},
		{{end -}}
	) ({{- if $clientMethod.ResponseType -}}{{$clientMethodResponseType}}, {{- end -}}map[string]string, error) {

		{{range $k, $v := $clientCallFixture.ClientReqHeaders -}}
		assert.Equal(
			t,
			"{{$v}}",
			reqHeaders["{{$k}}"])
		{{end -}}

		var resHeaders map[string]string
		{{if (len $clientCallFixture.ClientResHeaders) -}}
		resHeaders = map[string]string{}
		{{end -}}
		{{range $k, $v := $clientCallFixture.ClientResHeaders -}}
		resHeaders["{{$k}}"] = "{{$v}}"
		{{end}}

		{{if $clientMethod.ResponseType -}}
		var res {{unref $clientMethod.ResponseType}}

		clientResponse := []byte({{printf "` + "`" + `%s` + "`" + `" $clientCallFixture.ClientResponse.Body}})
		err := json.Unmarshal(clientResponse, &res)
		if err!= nil {
			t.Fatal("cant't unmarshal client response json to client response struct")
			return nil, resHeaders, err
		}
		return &res, resHeaders, nil
		{{else -}}
		return resHeaders, nil
		{{end -}}
	}

	headers := map[string]string{}
	err = gateway.TChannelBackends()["{{$clientName}}"].Register(
			"{{$testFixture.EndpointID}}", "{{$testFixture.HandleID}}", "{{$thriftService}}::{{$clientMethodName}}",
				{{$clientPackage}}.New{{$thriftService}}{{title $clientMethodName}}Handler({{$clientFunc}}),
		)
	assert.NoError(t, err)
	makeRequestAndValidate{{title $testFixture.HandleID}}{{title $testFixture.TestName}}(t, gateway, headers)

	isSet := true
	i := 1
	for serviceName := range alternateServiceDetail.ServicesDetailMap {
		headers := map[string]string{}

		if serviceName == "nomatch" {
			headers["x-container"] = "randomstr"
			headers["x-test-Env"] = "randomstr"
		} else {
			if isSet {
				headers["x-container"] = "sandbox"
				isSet = false
			} else {
				headers["x-test-Env"] = "test1"
			}
			err = gateway.TChannelBackends()["{{$clientName}}:"+strconv.Itoa(i)].Register(
				"{{$testFixture.EndpointID}}", "{{$testFixture.HandleID}}", "{{$thriftService}}::{{$clientMethodName}}",
				{{$clientPackage}}.New{{$thriftService}}{{title $clientMethodName}}Handler({{$clientFunc}}),
			)
			assert.NoError(t, err)
			i++
		}

		makeRequestAndValidate{{title $testFixture.HandleID}}{{title $testFixture.TestName}}(t, gateway, headers)
	}
	{{end}}
}

func makeRequestAndValidate{{title $testFixture.HandleID}}{{title $testFixture.TestName}}(t *testing.T, gateway testGateway.TestGateway, headers map[string]string) {
	{{ if $headers -}}
	{{range $k, $v := $testFixture.EndpointReqHeaders -}}
	headers["{{$k}}"] = "{{$v}}"
	{{end}}
	{{- end}}

	{{ if $testFixture.EndpointRequest.Body -}}
	endpointRequest := []byte({{printf "` + "`" + `%s` + "`" + `" $testFixture.EndpointRequest.Body}})
	{{else}}
	endpointRequest := []byte(` + "`" + `{}` + "`" + `)
	{{- end}}

	res, err := gateway.MakeRequest(
		"{{$.Method.HTTPMethod}}",
		"{{$.Method.HTTPPath}}",
		headers,
		bytes.NewReader(endpointRequest),
	)
	if !assert.NoError(t, err, "got http error") {
		return
	}

	{{if $responseType -}}
	defer func() { _ = res.Body.Close() }()
	data, err := io.ReadAll(res.Body)
	if !assert.NoError(t, err, "failed to read response body") {
		return
	}
	{{end}}

	assert.Equal(t, {{$.Method.OKStatusCode.Code}}, res.StatusCode)
	{{range $k, $v := $testFixture.EndpointResHeaders -}}
	assert.Equal(
		t,
		"{{$v}}",
		res.Header.Get("{{$k}}"))
	{{end -}}
	{{if $responseType -}}
		assert.JSONEq(t, ` + "`" + `{{$testFixture.EndpointResponse.Body}}` + "`" + `, string(data))
	{{end -}}
}

{{end -}}
{{end -}}
`)

func endpoint_test_tchannel_clientTmplBytes() ([]byte, error) {
	return _endpoint_test_tchannel_clientTmpl, nil
}

func endpoint_test_tchannel_clientTmpl() (*asset, error) {
	bytes, err := endpoint_test_tchannel_clientTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "endpoint_test_tchannel_client.tmpl", size: 6329, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _fixture_typesTmpl = []byte(`{{- /* template to render fixture type code for custom client */ -}}
{{- $imports := .Imports}}
{{- $methods := .Methods}}
{{- $scenariosMap := .Fixture.Scenarios}}
package clientmock

{{if (len $imports)}}
import (
	{{- range $path, $alias := $imports}}
	{{$alias}} "{{$path}}"
	{{- end}}
)
{{end}}

// ClientFixture defines the client fixture type
type ClientFixture struct {
{{- range $method := $methods}}
{{$methodName := $method.Name -}}
{{$methodName}} *{{$methodName}}Scenarios
{{- end -}}
}

{{range $method := $methods}}
{{$methodName := $method.Name -}}
{{$scenarios := index $scenariosMap $methodName -}}
// {{$methodName}}Scenarios defines all fixture scenarios for {{$methodName}}
type {{$methodName}}Scenarios struct {
{{range $scenario := $scenarios -}}
{{pascal $scenario}} *{{$methodName}}Fixture ` + "`" + `scenario:"{{$scenario}}"` + "`" + `
{{end -}}
}
{{end -}}


{{- range $method := $methods}}
{{$methodName := $method.Name -}}
// {{$methodName}}Fixture defines the fixture type for {{$methodName}}
type {{$methodName}}Fixture struct {
	{{- range $argName, $argType := $method.In}}
	{{title $argName}} {{$argType}}
	{{- end}}

	{{- if $method.Variadic}}
	{{title $method.Variadic}} []{{$method.VariadicType}}
	{{- end}}

	// Arg{n}Any indicates the nth argument could be gomock.Any
	{{- range $argName, $argType := $method.In}}
	{{title $argName}}Any bool
	{{- end}}

	{{- if $method.Variadic}}
	// {{title $method.Variadic}}Any indicates the variadic argument is a number of gomock.Any
	{{title $method.Variadic}}Any int
	{{- end}}


	{{range $retName, $retType := $method.Out}}
	{{title $retName}} {{$retType}}
	{{- end}}
}
{{- end}}
`)

func fixture_typesTmplBytes() ([]byte, error) {
	return _fixture_typesTmpl, nil
}

func fixture_typesTmpl() (*asset, error) {
	bytes, err := fixture_typesTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "fixture_types.tmpl", size: 1640, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _grpc_clientTmpl = []byte(`{{- /* template to render gateway gRPC client code */ -}}
{{- $instance := .Instance }}
{{- $services := .Services }}
package {{$instance.PackageInfo.PackageName}}

import (
	"context"

	"github.com/afex/hystrix-go/hystrix"
	"go.uber.org/yarpc"

	module "{{$instance.PackageInfo.ModulePackagePath}}"
	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
	zanzibar "github.com/uber/zanzibar/runtime"
)

{{$clientID := $instance.InstanceName -}}
{{$exposedMethods := .ExposedMethods -}}
{{$QPSLevels := .QPSLevels -}}
{{- $clientName := printf "%sClient" (camel $clientID) }}
{{- $exportName := .ExportName}}

// CircuitBreakerConfigKey is key value for qps level to circuit breaker parameters mapping
const CircuitBreakerConfigKey = "circuitbreaking-configurations"

// Client defines {{$clientID}} client interface.
type Client interface {
{{range $i, $svc := .ProtoServices -}}
	{{range $j, $method := $svc.RPC}}
	{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
	{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
	{{- if $methodName -}}
		{{$methodName}} (
		ctx context.Context,
		request *gen.{{$method.Request.Name}},
		opts ...yarpc.CallOption,
		) (context.Context, *gen.{{$method.Response.Name}}, error)
	{{ end -}}
	{{ end -}}
{{ end -}}
}

// {{$clientName}} is the gRPC client for downstream service.
type {{$clientName}} struct {
	{{range $i, $s := $services -}}
	{{camel $s.Name}}Client gen.{{pascal $s.Name}}YARPCClient
	{{ end -}}
	opts   *zanzibar.GRPCClientOpts
}

// NewClient returns a new gRPC client for service {{$clientID}}
func {{$exportName}}(deps *module.Dependencies) Client {
	oc := deps.Default.GRPCClientDispatcher.MustOutboundConfig("{{$clientID}}")
	var routingKey string
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.routingKey") {
		routingKey = deps.Default.Config.MustGetString("clients.{{$clientID}}.routingKey")
	}
	var requestUUIDHeaderKey string
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.requestUUIDHeaderKey") {
		requestUUIDHeaderKey = deps.Default.Config.MustGetString("clients.{{$clientID}}.requestUUIDHeaderKey")
	}
	timeoutInMS := int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.timeout"))
	methodNames := map[string]string{
		{{range $i, $svc := .ProtoServices -}}
			{{range $j, $method := $svc.RPC -}}
			{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
			{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
			{{- if $methodName -}}
				"{{$serviceMethod}}": "{{$methodName}}",
			{{ end -}}
			{{- end -}}
		{{- end}}
	}

	qpsLevels := map[string]string{
			{{range $methodName, $qpsLevel := $QPSLevels -}}
			"{{$methodName}}": "{{$qpsLevel}}",
			{{end}}
	}

	// circuitBreakerDisabled sets whether circuit-breaker should be disabled
	circuitBreakerDisabled := false
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.circuitBreakerDisabled") {
		circuitBreakerDisabled = deps.Default.Config.MustGetBoolean("clients.{{$clientID}}.circuitBreakerDisabled")
	}
	if !circuitBreakerDisabled {
		for _, methodName := range methodNames {
			circuitBreakerName := "{{$clientID}}"  + "-" + methodName
			qpsLevel := "default"
			if level, ok := qpsLevels[circuitBreakerName]; ok {
				qpsLevel = level
			}
			configureCircuitBreaker(deps, timeoutInMS, circuitBreakerName, qpsLevel)
		}
	}

	return &{{$clientName}}{
		{{range $i, $s := $services -}}
		{{camel $s.Name}}Client: gen.New{{pascal $s.Name}}YARPCClient(oc),
		{{ end -}}
		opts: zanzibar.NewGRPCClientOpts(
		deps.Default.ContextLogger,
		deps.Default.ContextMetrics,
		deps.Default.ContextExtractor,
		methodNames,
		"{{$clientID}}",
		routingKey,
		requestUUIDHeaderKey,
		circuitBreakerDisabled,
		timeoutInMS,
		),
	}
}

// CircuitBreakerConfig is used for storing the circuit breaker parameters for each qps level
type CircuitBreakerConfig struct {
	Parameters map[string]map[string]int
}

func configureCircuitBreaker(deps *module.Dependencies, timeoutVal int, circuitBreakerName string, qpsLevel string) {
	// sleepWindowInMilliseconds sets the amount of time, after tripping the circuit,
	// to reject requests before allowing attempts again to determine if the circuit should again be closed
	sleepWindowInMilliseconds := 5000
	// maxConcurrentRequests sets how many requests can be run at the same time, beyond which requests are rejected
	maxConcurrentRequests := 20
	// errorPercentThreshold sets the error percentage at or above which the circuit should trip open
	errorPercentThreshold := 20
	// requestVolumeThreshold sets a minimum number of requests that will trip the circuit in a rolling window of 10s
	// For example, if the value is 20, then if only 19 requests are received in the rolling window of 10 seconds
	// the circuit will not trip open even if all 19 failed.
	requestVolumeThreshold := 20
	// parses circuit breaker configurations
	if deps.Default.Config.ContainsKey(CircuitBreakerConfigKey) {
		var config CircuitBreakerConfig
		deps.Default.Config.MustGetStruct(CircuitBreakerConfigKey, &config)
		parameters := config.Parameters
		// first checks if level exists in configurations then assigns parameters
		// if "default" qps level assigns default parameters from circuit breaker configurations
		if settings, ok := parameters[qpsLevel]; ok {
			if sleep, ok := settings["sleepWindowInMilliseconds"]; ok {
				sleepWindowInMilliseconds = sleep
			}
			if max, ok := settings["maxConcurrentRequests"]; ok {
				maxConcurrentRequests = max
			}
			if errorPercent, ok := settings["errorPercentThreshold"]; ok {
				errorPercentThreshold = errorPercent
			}
			if reqVolThreshold, ok := settings["requestVolumeThreshold"]; ok {
				requestVolumeThreshold = reqVolThreshold
			}
		}
	}
	// client settings override parameters
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.sleepWindowInMilliseconds") {
		sleepWindowInMilliseconds = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.sleepWindowInMilliseconds"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.maxConcurrentRequests") {
		maxConcurrentRequests = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.maxConcurrentRequests"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.errorPercentThreshold") {
		errorPercentThreshold = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.errorPercentThreshold"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.requestVolumeThreshold") {
		requestVolumeThreshold = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.requestVolumeThreshold"))
	}
	hystrix.ConfigureCommand(circuitBreakerName, hystrix.CommandConfig{
		MaxConcurrentRequests:  maxConcurrentRequests,
		ErrorPercentThreshold:  errorPercentThreshold,
		SleepWindow:            sleepWindowInMilliseconds,
		RequestVolumeThreshold: requestVolumeThreshold,
		Timeout:                timeoutVal,
	})
}

{{range $i, $svc := .ProtoServices -}}
{{range $j, $method := $svc.RPC -}}
{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
{{if $methodName -}}
// {{$methodName}} is a client RPC call for method {{printf "%s::%s" $svc.Name $method.Name}}.
func (e *{{$clientName}}) {{$methodName}}(
	ctx context.Context,
	request *gen.{{$method.Request.Name}},
	opts ...yarpc.CallOption,
) (context.Context, *gen.{{$method.Response.Name}}, error) {
	var result *gen.{{$method.Response.Name}}
	var err error

	ctx, callHelper := zanzibar.NewGRPCClientCallHelper(ctx, "{{printf "%s::%s" $svc.Name $method.Name}}", e.opts)

	if e.opts.RoutingKey != "" {
		opts = append(opts, yarpc.WithRoutingKey(e.opts.RoutingKey))
	}
	if e.opts.RequestUUIDHeaderKey != "" {
		reqUUID := zanzibar.RequestUUIDFromCtx(ctx)
		if reqUUID != "" {
			opts = append(opts, yarpc.WithHeader(e.opts.RequestUUIDHeaderKey, reqUUID))
		}
	}
	// Creating a new child context with timeout for the yarpc call as this gets cancelled as soon as call is returned
	// from this client or deadline exceeded after timeout
	ctxWithTimeout, cancel := context.WithTimeout(ctx, e.opts.Timeout)
	defer cancel()

	runFunc := e.{{camel $svc.Name}}Client.{{$method.Name}}
	callHelper.Start()
	if e.opts.CircuitBreakerDisabled {
		result, err = runFunc(ctxWithTimeout, request, opts...)
	} else {
		circuitBreakerName := "{{$clientID}}" + "-" + "{{$methodName}}"
		err = hystrix.DoC(ctxWithTimeout, circuitBreakerName, func(ctx context.Context) error {
			result, err = runFunc(ctx, request, opts...)
			return err
		}, nil)
	}
	callHelper.Finish(ctx, err)

	return ctx, result, err
}
{{end -}}
{{end -}}
{{end}}
`)

func grpc_clientTmplBytes() ([]byte, error) {
	return _grpc_clientTmpl, nil
}

func grpc_clientTmpl() (*asset, error) {
	bytes, err := grpc_clientTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "grpc_client.tmpl", size: 8644, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _http_clientTmpl = []byte(`{{- /* template to render edge gateway http client code */ -}}
{{- $instance := .Instance }}
package {{$instance.PackageInfo.PackageName}}

import (
	"context"
	"fmt"
	"net/textproto"
	"github.com/afex/hystrix-go/hystrix"
	"strconv"
	"time"

	"github.com/pkg/errors"
	"github.com/uber/zanzibar/config"
	zanzibar "github.com/uber/zanzibar/runtime"
	"github.com/uber/zanzibar/runtime/jsonwrapper"

	module "{{$instance.PackageInfo.ModulePackagePath}}"
	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
)

{{- $clientID := .ClientID -}}
{{$exposedMethods := .ExposedMethods -}}
{{$QPSLevels := .QPSLevels -}}
{{- $clientName := printf "%sClient" (camel $clientID) }}
{{- $exportName := .ExportName}}
{{- $sidecarRouter := .SidecarRouter}}

// CircuitBreakerConfigKey is key value for qps level to circuit breaker parameters mapping
const CircuitBreakerConfigKey = "circuitbreaking-configurations"

// Client defines {{$clientID}} client interface.
type Client interface {
	HTTPClient() *zanzibar.HTTPClient
{{- range $svc := .Services -}}
{{range .Methods}}
{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
{{- if $methodName -}}
	{{$methodName}}(
		ctx context.Context,
		reqHeaders map[string]string,
		{{if ne .RequestType "" -}}
		args {{.RequestType}},
		{{end -}}
	) (context.Context, {{- if ne .ResponseType "" -}} {{.ResponseType}}, {{- end -}}map[string]string, error)
{{- end -}}
{{- end -}}
{{- end -}}
}

// {{$clientName}} is the http client.
type {{$clientName}} struct {
	clientID string
	httpClient   *zanzibar.HTTPClient
	jsonWrapper   jsonwrapper.JSONWrapper
	circuitBreakerDisabled bool
	requestUUIDHeaderKey string
	requestProcedureHeaderKey string

	{{if $sidecarRouter -}}
	calleeHeader string
	callerHeader string
	callerName   string
	calleeName   string
	altRoutingMap map[string]map[string]string
	{{end -}}
}

// {{$exportName}} returns a new http client.
func {{$exportName}}(deps *module.Dependencies) Client {
	{{if $sidecarRouter -}}
	ip := deps.Default.Config.MustGetString("sidecarRouter.{{$sidecarRouter}}.http.ip")
	port := deps.Default.Config.MustGetInt("sidecarRouter.{{$sidecarRouter}}.http.port")
	callerHeader := deps.Default.Config.MustGetString("sidecarRouter.{{$sidecarRouter}}.http.callerHeader")
	calleeHeader := deps.Default.Config.MustGetString("sidecarRouter.{{$sidecarRouter}}.http.calleeHeader")
	callerName := deps.Default.Config.MustGetString("serviceName")
	calleeName := deps.Default.Config.MustGetString("clients.{{$clientID}}.serviceName")

	var altServiceDetail = config.AlternateServiceDetail{}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.alternates") {
		deps.Default.Config.MustGetStruct("clients.{{$clientID}}.alternates", &altServiceDetail)
	}

	{{else -}}
	ip := deps.Default.Config.MustGetString("clients.{{$clientID}}.ip")
	port := deps.Default.Config.MustGetInt("clients.{{$clientID}}.port")
	{{end -}}
	baseURL := fmt.Sprintf("http://%s:%d", ip, port)
	timeoutVal := int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.timeout"))
	timeout := time.Millisecond * time.Duration(
		timeoutVal,
	)
	defaultHeaders := make(map[string]string)
	if deps.Default.Config.ContainsKey("http.defaultHeaders") {
		deps.Default.Config.MustGetStruct("http.defaultHeaders", &defaultHeaders)
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.defaultHeaders") {
		deps.Default.Config.MustGetStruct("clients.{{$clientID}}.defaultHeaders", &defaultHeaders)
	}
	var requestUUIDHeaderKey string
	if deps.Default.Config.ContainsKey("http.clients.requestUUIDHeaderKey") {
		requestUUIDHeaderKey = deps.Default.Config.MustGetString("http.clients.requestUUIDHeaderKey")
	}
	var requestProcedureHeaderKey string
	if deps.Default.Config.ContainsKey("http.clients.requestProcedureHeaderKey"){
		requestProcedureHeaderKey = deps.Default.Config.MustGetString("http.clients.requestProcedureHeaderKey")
	}
	followRedirect := true
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.followRedirect") {
		followRedirect = deps.Default.Config.MustGetBoolean("clients.{{$clientID}}.followRedirect")
	}

	methodNames := map[string]string{
				{{range $serviceMethod, $methodName := $exposedMethods -}}
				"{{$methodName}}": "{{$serviceMethod}}",
				{{end}}
	}
	// circuitBreakerDisabled sets whether circuit-breaker should be disabled
	circuitBreakerDisabled := false
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.circuitBreakerDisabled") {
		circuitBreakerDisabled = deps.Default.Config.MustGetBoolean("clients.{{$clientID}}.circuitBreakerDisabled")
	}

	//get mapping of client method and it's timeout
	//if mapping is not provided, use client's timeout for all methods
	clientMethodTimeoutMapping := make(map[string]int64)
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.methodTimeoutMapping") {
		deps.Default.Config.MustGetStruct("clients.{{$clientID}}.methodTimeoutMapping", &clientMethodTimeoutMapping)
	} else {
		//override the client overall-timeout with the client's method level timeout
		for methodName := range methodNames {
			clientMethodTimeoutMapping[methodName] = int64(timeoutVal)
		}
	}

	qpsLevels := map[string]string{
				{{range $methodName, $qpsLevel := $QPSLevels -}}
				"{{$methodName}}": "{{$qpsLevel}}",
				{{end}}
	}
	if !circuitBreakerDisabled {
		for methodName, methodTimeout := range clientMethodTimeoutMapping{
			circuitBreakerName := "{{$clientID}}" + "-" + methodName
			qpsLevel := "default"
			if level, ok := qpsLevels[circuitBreakerName]; ok {
				qpsLevel = level
			}
			configureCircuitBreaker(deps, int(methodTimeout), circuitBreakerName, qpsLevel)
		}
	}

	return &{{$clientName}}{
		clientID: "{{$clientID}}",
		{{if $sidecarRouter -}}
		callerHeader: callerHeader,
		calleeHeader: calleeHeader,
		callerName: callerName,
		calleeName: calleeName,
		altRoutingMap: initializeAltRoutingMap(altServiceDetail),
		{{end -}}
		httpClient: zanzibar.NewHTTPClientContext(
			deps.Default.ContextLogger, deps.Default.ContextMetrics, deps.Default.JSONWrapper,
			"{{$clientID}}",
			methodNames,
			baseURL,
			defaultHeaders,
			timeout,
			followRedirect,
		),
		circuitBreakerDisabled: circuitBreakerDisabled,
		requestUUIDHeaderKey: requestUUIDHeaderKey,
		requestProcedureHeaderKey: requestProcedureHeaderKey,
	}
}

{{if $sidecarRouter -}}
func initializeAltRoutingMap(altServiceDetail config.AlternateServiceDetail) map[string]map[string]string {
	// The goal is to support for each header key, multiple values that point to different services
	routingMap := make(map[string]map[string]string)
	for _, alt := range altServiceDetail.RoutingConfigs {
		if headerValueToServiceMap, ok := routingMap[textproto.CanonicalMIMEHeaderKey(alt.HeaderName)]; ok {
			headerValueToServiceMap[alt.HeaderValue] = alt.ServiceName
		} else {
			routingMap[textproto.CanonicalMIMEHeaderKey(alt.HeaderName)] = map[string]string{alt.HeaderValue:alt.ServiceName}
		}
	}
	return routingMap
}
{{end -}}

// CircuitBreakerConfig is used for storing the circuit breaker parameters for each qps level
type CircuitBreakerConfig struct {
	Parameters map[string]map[string]int
}

func configureCircuitBreaker(deps *module.Dependencies, timeoutVal int, circuitBreakerName string, qpsLevel string) {
	// sleepWindowInMilliseconds sets the amount of time, after tripping the circuit,
	// to reject requests before allowing attempts again to determine if the circuit should again be closed
	sleepWindowInMilliseconds := 5000
	// maxConcurrentRequests sets how many requests can be run at the same time, beyond which requests are rejected
	maxConcurrentRequests := 20
	// errorPercentThreshold sets the error percentage at or above which the circuit should trip open
	errorPercentThreshold := 20
	// requestVolumeThreshold sets a minimum number of requests that will trip the circuit in a rolling window of 10s
	// For example, if the value is 20, then if only 19 requests are received in the rolling window of 10 seconds
	// the circuit will not trip open even if all 19 failed.
	requestVolumeThreshold := 20
	// parses circuit breaker configurations
	if deps.Default.Config.ContainsKey(CircuitBreakerConfigKey) {
		var config CircuitBreakerConfig
		deps.Default.Config.MustGetStruct(CircuitBreakerConfigKey, &config)
		parameters := config.Parameters
		// first checks if level exists in configurations then assigns parameters
		// if "default" qps level assigns default parameters from circuit breaker configurations
		if settings, ok := parameters[qpsLevel]; ok {
			if sleep, ok := settings["sleepWindowInMilliseconds"]; ok {
				sleepWindowInMilliseconds = sleep
			}
			if max, ok := settings["maxConcurrentRequests"]; ok {
				maxConcurrentRequests = max
			}
			if errorPercent, ok := settings["errorPercentThreshold"]; ok {
				errorPercentThreshold = errorPercent
			}
			if reqVolThreshold, ok := settings["requestVolumeThreshold"]; ok {
				requestVolumeThreshold = reqVolThreshold
			}
		}
	}
	// client settings override parameters
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.sleepWindowInMilliseconds") {
		sleepWindowInMilliseconds = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.sleepWindowInMilliseconds"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.maxConcurrentRequests") {
		maxConcurrentRequests = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.maxConcurrentRequests"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.errorPercentThreshold") {
		errorPercentThreshold = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.errorPercentThreshold"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.requestVolumeThreshold") {
		requestVolumeThreshold = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.requestVolumeThreshold"))
	}
	hystrix.ConfigureCommand(circuitBreakerName, hystrix.CommandConfig{
			MaxConcurrentRequests:  maxConcurrentRequests,
			ErrorPercentThreshold:  errorPercentThreshold,
			SleepWindow:            sleepWindowInMilliseconds,
			RequestVolumeThreshold: requestVolumeThreshold,
			Timeout:                timeoutVal,
		})
}

// HTTPClient returns the underlying HTTP client, should only be
// used for internal testing.
func (c *{{$clientName}}) HTTPClient() *zanzibar.HTTPClient {
	return c.httpClient
}

{{range $svc := .Services}}
{{range .Methods}}
{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
{{if $methodName -}}

// {{$methodName}} calls "{{.HTTPPath}}" endpoint.
func (c *{{$clientName}}) {{$methodName}}(
	ctx context.Context,
	headers map[string]string,
	{{if ne .RequestType "" -}}
	r {{.RequestType}},
	{{end -}}
) (context.Context, {{- if ne .ResponseType "" -}} {{.ResponseType}}, {{- end -}}map[string]string, error) {
	reqUUID := zanzibar.RequestUUIDFromCtx(ctx)
	if headers == nil {
		headers = make(map[string]string)
	}
	if reqUUID != "" {
		headers[c.requestUUIDHeaderKey] = reqUUID
	}
	if c.requestProcedureHeaderKey != "" {
		headers[c.requestProcedureHeaderKey] = "{{$serviceMethod}}"
	}

	{{if .ResponseType -}}
	var defaultRes  {{.ResponseType}}
	{{end -}}
	req := zanzibar.NewClientHTTPRequest(ctx, c.clientID, "{{$methodName}}", "{{$serviceMethod}}", c.httpClient)

	{{if .ReqHeaderGoStatements }}
	{{range $index, $line := .ReqClientHeaderGoStatements -}}
	{{$line}}
	{{end -}}
	{{- end}}

	{{if $sidecarRouter -}}
	headers[c.callerHeader] = c.callerName

	// Set the service name if dynamic routing header is present
	for routeHeaderKey, routeMap := range c.altRoutingMap {
		if headerVal, ok := headers[routeHeaderKey]; ok {
			for routeRegex, altServiceName := range routeMap {
				//if headerVal matches routeRegex regex, set the alternative service name
				if matchFound, _ := regexp.MatchString(routeRegex, headerVal); matchFound {
					headers[c.calleeHeader] = altServiceName
					break
				}
			}
		}
	}

	// If serviceName was not set in the dynamic routing section above, set as the default
	if _, ok := headers[c.calleeHeader]; !ok {
		headers[c.calleeHeader] = c.calleeName
	}
	{{end}}

	// Generate full URL.
	fullURL := c.httpClient.BaseURL
	{{- range $k, $segment := .PathSegments -}}
	{{- if eq $segment.Type "static" -}}+"/{{$segment.Text}}"
	{{- else -}}+"/"+string({{- if not $segment.Required }} * {{- end -}}r{{$segment.BodyIdentifier | title}})
	{{- end -}}
	{{- end}}

	{{range $index, $line := .WriteQueryParamGoStatements -}}
	{{$line}}
	{{end}}

	{{if (and (ne .RequestType "") (ne .HTTPMethod "GET"))}}
	{{if and (.RequestBoxed) (eq .BoxedRequestType "[]byte")}}
		err := req.WriteBytes("{{.HTTPMethod}}", fullURL, headers, r.{{.BoxedRequestName}})
	{{else}}
		err := req.WriteJSON("{{.HTTPMethod}}", fullURL, headers, {{if .RequestBoxed -}}r.{{.BoxedRequestName}}{{- else -}}r{{- end -}})
	{{end -}}
	{{else}}
	err := req.WriteJSON("{{.HTTPMethod}}", fullURL, headers, nil)
	{{end}} {{- /* <if .RequestType ne ""> */ -}}
	if err != nil {
		return {{if eq .ResponseType ""}}ctx, nil, err{{else}}ctx, defaultRes, nil, err{{end}}
	}

	{{if .ReqHeaders }}
	headerErr := req.CheckHeaders({{.ReqHeaders | printf "%#v"}})
	if headerErr != nil {
		return {{ if eq .ResponseType "" -}}
			ctx, nil, headerErr
			{{- else -}}
			ctx, defaultRes, nil, headerErr
			{{- end}}
	}
	{{- end}}

	var res *zanzibar.ClientHTTPResponse
	if (c.circuitBreakerDisabled) {
		res, err = req.Do()
	} else {
		// We want hystrix ckt-breaker to count errors only for system issues
		var clientErr error
		circuitBreakerName := "{{$clientID}}" + "-" + "{{$methodName}}"
		err = hystrix.DoC(ctx, circuitBreakerName, func(ctx context.Context) error {
			res, clientErr = req.Do()
			if res != nil {
				// This is not a system error/issue. Downstream responded
				return nil
			}
			return clientErr
		}, nil)
		if err == nil {
			// ckt-breaker was ok, bubble up client error if set
			err = clientErr
		}
	}
	if err != nil {
		return ctx, {{if eq .ResponseType ""}}nil, err{{else}}defaultRes, nil, err{{end}}
	}

	respHeaders := make(map[string]string)
	for k := range res.Header {
		respHeaders[k] = res.Header.Get(k)
	}

	defer func() {
		respHeaders[zanzibar.ClientResponseDurationKey] = res.Duration.String()
	}()

	{{- if .ResHeaders }}
	// TODO(jakev): verify mandatory response headers
	{{- end}}

	res.CheckOKResponse([]int{
		{{- range $index, $code := .ValidStatusCodes -}}
		{{if $index}},{{end}}{{$code}}
		{{- end -}}
	})

	{{if and (eq .ResponseType "") (eq (len .Exceptions) 0)}}
	switch res.StatusCode {
		case {{.OKStatusCode.Code}}:
			{{- if and (ne (.OKStatusCode.Code) 204) (ne (.OKStatusCode.Code) 304) -}}
			_, err = res.ReadAll()
			if err != nil {
				return ctx, respHeaders, err
			}
			{{- end}}
			return ctx, respHeaders, nil
		default:
			_, err = res.ReadAll()
			if err != nil {
				return ctx, respHeaders, err
			}
	}
	{{else if eq (len .Exceptions) 0}}
	switch res.StatusCode {
		case {{.OKStatusCode.Code}}:
		{{- if or (eq (.OKStatusCode.Code) 204) (eq (.OKStatusCode.Code) 304) -}}
			return ctx, {{if isPointerType .ResponseType}}&{{end}}{{unref .ResponseType}}{}, respHeaders, nil
		{{- else }}
		{{- if eq .ResponseType "[]byte"}}
		responseBody, err := res.ReadAll()
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}
		return ctx, responseBody, respHeaders, nil
		{{ else }}
		var responseBody {{unref .ResponseType}}
		rawBody, err := res.ReadAll()
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}
		err = res.UnmarshalBody(&responseBody, rawBody)
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}

		{{- if .ResHeaderFields }}
			// TODO(jakev): read response headers and put them in body
		{{- end}}

		return ctx, {{if isPointerType .ResponseType}}&{{end}}responseBody, respHeaders, nil
		{{end -}}
		{{end -}}
		default:
			_, err = res.ReadAll()
			if err != nil {
				return ctx, defaultRes, respHeaders, err
			}
	}
	{{else if eq .ResponseType ""}}
	switch res.StatusCode {
		case {{.OKStatusCode.Code}}:
			{{- if and (ne (.OKStatusCode.Code) 204) (ne (.OKStatusCode.Code) 304) -}}
			_, err = res.ReadAll()
			if err != nil {
				return ctx, respHeaders, err
			}
			{{- end}}

			return ctx, respHeaders, nil
		{{range $code, $exceptions := .ExceptionsByStatusCode -}}
		case {{$code}}:
			{{- if or (eq $code 204) (eq $code 304) }}
				{{/* If multiple exceptions have 204/304 status code mapped, we aren't able to distinguish between them */}}
				{{/* so we'll just return the first exception that has 204/304 status code set. */}}
				{{$val := index $exceptions 0}}
				return ctx, respHeaders, &{{$val.Type}}{}
			{{ else if and (eq (len $exceptions) 1) (eq  (index $exceptions 0).IsBodyDisallowed true) -}}
				{{$val := index $exceptions 0}}
				return ctx, respHeaders, &{{$val.Type}}{}
			{{else}}
			allOptions := []interface{}{
			{{range $idx, $exception := $exceptions -}}
				&{{$exception.Type}}{},
			{{- end}}
			}
			v, err := res.ReadAndUnmarshalBodyMultipleOptions(allOptions)
			if err != nil {
				return ctx, respHeaders, err
			}
			return ctx, respHeaders, v.(error)
			{{end}}
		{{- end}}
		default:
			_, err = res.ReadAll()
			if err != nil {
				return ctx, respHeaders, err
			}
	}
	{{else}}

	switch res.StatusCode {
		case {{.OKStatusCode.Code}}:
		{{- if or (eq (.OKStatusCode.Code) 204) (eq (.OKStatusCode.Code) 304) }}
			return ctx, {{if isPointerType .ResponseType}}&{{end}}{{unref .ResponseType}}{}, respHeaders, nil
		{{- else }}
		{{- if eq .ResponseType "[]byte"}}
		responseBody, err := res.ReadAll()
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}
		return ctx, responseBody, respHeaders, nil
		{{ else }}
		var responseBody {{unref .ResponseType}}
		rawBody, err := res.ReadAll()
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}
		err = res.UnmarshalBody(&responseBody, rawBody)
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}

		{{- if .ResHeaderFields }}
			// TODO(jakev): read response headers and put them in body
		{{- end}}

		return ctx, {{if isPointerType .ResponseType}}&{{end}}responseBody, respHeaders, nil
		{{end -}}
		{{end}}
		{{range $code, $exceptions := .ExceptionsByStatusCode -}}
		case {{$code}}:
			{{- if or (eq $code 204) (eq $code 304) }}
				{{/* If multiple exceptions have 204/304 status code mapped, we aren't able to distinguish between them */}}
				{{/* so we'll just return the first exception that has 204/304 status code set. */}}
				{{$val := index $exceptions 0}}
				return ctx, defaultRes, respHeaders, &{{$val.Type}}{}
			{{ else if and (eq (len $exceptions) 1) (eq  (index $exceptions 0).IsBodyDisallowed true) -}}
				{{$val := index $exceptions 0}}
				return ctx, defaultRes, respHeaders, &{{$val.Type}}{}
			{{else}}
			allOptions := []interface{}{
				{{range $idx, $exception := $exceptions -}}
				&{{$exception.Type}}{},
				{{- end}}
			}
			v, err := res.ReadAndUnmarshalBodyMultipleOptions(allOptions)
			if err != nil {
				return ctx, defaultRes, respHeaders, err
			}
			return ctx, defaultRes, respHeaders, v.(error)
			{{end}}
		{{- end}}
		default:
			_, err = res.ReadAll()
			if err != nil {
				return ctx, defaultRes, respHeaders, err
			}
	}
	{{end}}

	return ctx, {{if ne .ResponseType ""}}defaultRes, {{end}}respHeaders, &zanzibar.UnexpectedHTTPError{
		StatusCode: res.StatusCode,
		RawBody: res.GetRawBody(),
	}
}
{{end}}
{{end}}
{{end}}
`)

func http_clientTmplBytes() ([]byte, error) {
	return _http_clientTmpl, nil
}

func http_clientTmpl() (*asset, error) {
	bytes, err := http_clientTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "http_client.tmpl", size: 19491, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _http_client_testTmpl = []byte(`{{- /* template to render edge gateway http client code */ -}}
{{- $instance := .Instance }}
package {{$instance.PackageInfo.PackageName}}

import (
	"context"
	"fmt"
	"net/textproto"
	"github.com/afex/hystrix-go/hystrix"
	"strconv"
	"time"

	"github.com/pkg/errors"
	"github.com/uber/zanzibar/config"
	zanzibar "github.com/uber/zanzibar/runtime"
	"github.com/uber/zanzibar/runtime/jsonwrapper"

	module "{{$instance.PackageInfo.ModulePackagePath}}"
	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
)

{{- $clientID := .ClientID -}}
{{$exposedMethods := .ExposedMethods -}}
{{$QPSLevels := .QPSLevels -}}
{{- $clientName := printf "%sClient" (camel $clientID) }}
{{- $exportName := .ExportName}}
{{- $sidecarRouter := .SidecarRouter}}

// CustomTemplateTesting generated for testing of custom template feature
const CustomTemplateTesting = "test"
// CircuitBreakerConfigKey is key value for qps level to circuit breaker parameters mapping
const CircuitBreakerConfigKey = "circuitbreaking-configurations"

// Client defines {{$clientID}} client interface.
type Client interface {
	HTTPClient() *zanzibar.HTTPClient
{{- range $svc := .Services -}}
{{range .Methods}}
{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
{{- if $methodName -}}
	{{$methodName}}(
		ctx context.Context,
		reqHeaders map[string]string,
		{{if ne .RequestType "" -}}
		args {{.RequestType}},
		{{end -}}
	) (context.Context, {{- if ne .ResponseType "" -}} {{.ResponseType}}, {{- end -}}map[string]string, error)
{{- end -}}
{{- end -}}
{{- end -}}
}

// {{$clientName}} is the http client.
type {{$clientName}} struct {
	clientID string
	httpClient   *zanzibar.HTTPClient
	jsonWrapper   jsonwrapper.JSONWrapper
	circuitBreakerDisabled bool
	requestUUIDHeaderKey string
	requestProcedureHeaderKey string

	{{if $sidecarRouter -}}
	calleeHeader string
	callerHeader string
	callerName   string
	calleeName   string
	altRoutingMap map[string]map[string]string
	{{end -}}
}

// {{$exportName}} returns a new http client.
func {{$exportName}}(deps *module.Dependencies) Client {
	{{if $sidecarRouter -}}
	ip := deps.Default.Config.MustGetString("sidecarRouter.{{$sidecarRouter}}.http.ip")
	port := deps.Default.Config.MustGetInt("sidecarRouter.{{$sidecarRouter}}.http.port")
	callerHeader := deps.Default.Config.MustGetString("sidecarRouter.{{$sidecarRouter}}.http.callerHeader")
	calleeHeader := deps.Default.Config.MustGetString("sidecarRouter.{{$sidecarRouter}}.http.calleeHeader")
	callerName := deps.Default.Config.MustGetString("serviceName")
	calleeName := deps.Default.Config.MustGetString("clients.{{$clientID}}.serviceName")

	var altServiceDetail = config.AlternateServiceDetail{}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.alternates") {
		deps.Default.Config.MustGetStruct("clients.{{$clientID}}.alternates", &altServiceDetail)
	}

	{{else -}}
	ip := deps.Default.Config.MustGetString("clients.{{$clientID}}.ip")
	port := deps.Default.Config.MustGetInt("clients.{{$clientID}}.port")
	{{end -}}
	baseURL := fmt.Sprintf("http://%s:%d", ip, port)
	timeoutVal := int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.timeout"))
	timeout := time.Millisecond * time.Duration(
		timeoutVal,
	)
	defaultHeaders := make(map[string]string)
	if deps.Default.Config.ContainsKey("http.defaultHeaders") {
		deps.Default.Config.MustGetStruct("http.defaultHeaders", &defaultHeaders)
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.defaultHeaders") {
		deps.Default.Config.MustGetStruct("clients.{{$clientID}}.defaultHeaders", &defaultHeaders)
	}
	var requestUUIDHeaderKey string
	if deps.Default.Config.ContainsKey("http.clients.requestUUIDHeaderKey") {
		requestUUIDHeaderKey = deps.Default.Config.MustGetString("http.clients.requestUUIDHeaderKey")
	}
	var requestProcedureHeaderKey string
	if deps.Default.Config.ContainsKey("http.clients.requestProcedureHeaderKey"){
		requestProcedureHeaderKey = deps.Default.Config.MustGetString("http.clients.requestProcedureHeaderKey")
	}
	followRedirect := true
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.followRedirect") {
		followRedirect = deps.Default.Config.MustGetBoolean("clients.{{$clientID}}.followRedirect")
	}

	methodNames := map[string]string{
				{{range $serviceMethod, $methodName := $exposedMethods -}}
				"{{$methodName}}": "{{$serviceMethod}}",
				{{end}}
	}
	// circuitBreakerDisabled sets whether circuit-breaker should be disabled
	circuitBreakerDisabled := false
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.circuitBreakerDisabled") {
		circuitBreakerDisabled = deps.Default.Config.MustGetBoolean("clients.{{$clientID}}.circuitBreakerDisabled")
	}

	//get mapping of client method and it's timeout
	//if mapping is not provided, use client's timeout for all methods
	clientMethodTimeoutMapping := make(map[string]int64)
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.methodTimeoutMapping") {
		deps.Default.Config.MustGetStruct("clients.{{$clientID}}.methodTimeoutMapping", &clientMethodTimeoutMapping)
	} else {
		//override the client overall-timeout with the client's method level timeout
		for methodName := range methodNames {
			clientMethodTimeoutMapping[methodName] = int64(timeoutVal)
		}
	}

	qpsLevels := map[string]string{
				{{range $methodName, $qpsLevel := $QPSLevels -}}
				"{{$methodName}}": "{{$qpsLevel}}",
				{{end}}
	}
	if !circuitBreakerDisabled {
		for methodName, methodTimeout := range clientMethodTimeoutMapping{
			circuitBreakerName := "{{$clientID}}" + "-" + methodName
			qpsLevel := "default"
			if level, ok := qpsLevels[circuitBreakerName]; ok {
				qpsLevel = level
			}
			configureCircuitBreaker(deps, int(methodTimeout), circuitBreakerName, qpsLevel)
		}
	}

	return &{{$clientName}}{
		clientID: "{{$clientID}}",
		{{if $sidecarRouter -}}
		callerHeader: callerHeader,
		calleeHeader: calleeHeader,
		callerName: callerName,
		calleeName: calleeName,
		altRoutingMap: initializeAltRoutingMap(altServiceDetail),
		{{end -}}
		httpClient: zanzibar.NewHTTPClientContext(
			deps.Default.ContextLogger, deps.Default.ContextMetrics, deps.Default.JSONWrapper,
			"{{$clientID}}",
			methodNames,
			baseURL,
			defaultHeaders,
			timeout,
			followRedirect,
		),
		circuitBreakerDisabled: circuitBreakerDisabled,
		requestUUIDHeaderKey: requestUUIDHeaderKey,
		requestProcedureHeaderKey: requestProcedureHeaderKey,
	}
}

{{if $sidecarRouter -}}
func initializeAltRoutingMap(altServiceDetail config.AlternateServiceDetail) map[string]map[string]string {
	// The goal is to support for each header key, multiple values that point to different services
	routingMap := make(map[string]map[string]string)
	for _, alt := range altServiceDetail.RoutingConfigs {
		if headerValueToServiceMap, ok := routingMap[textproto.CanonicalMIMEHeaderKey(alt.HeaderName)]; ok {
			headerValueToServiceMap[alt.HeaderValue] = alt.ServiceName
		} else {
			routingMap[textproto.CanonicalMIMEHeaderKey(alt.HeaderName)] = map[string]string{alt.HeaderValue:alt.ServiceName}
		}
	}
	return routingMap
}
{{end -}}

// CircuitBreakerConfig is used for storing the circuit breaker parameters for each qps level
type CircuitBreakerConfig struct {
	Parameters map[string]map[string]int
}

func configureCircuitBreaker(deps *module.Dependencies, timeoutVal int, circuitBreakerName string, qpsLevel string) {
	// sleepWindowInMilliseconds sets the amount of time, after tripping the circuit,
	// to reject requests before allowing attempts again to determine if the circuit should again be closed
	sleepWindowInMilliseconds := 5000
	// maxConcurrentRequests sets how many requests can be run at the same time, beyond which requests are rejected
	maxConcurrentRequests := 20
	// errorPercentThreshold sets the error percentage at or above which the circuit should trip open
	errorPercentThreshold := 20
	// requestVolumeThreshold sets a minimum number of requests that will trip the circuit in a rolling window of 10s
	// For example, if the value is 20, then if only 19 requests are received in the rolling window of 10 seconds
	// the circuit will not trip open even if all 19 failed.
	requestVolumeThreshold := 20
	// parses circuit breaker configurations
	if deps.Default.Config.ContainsKey(CircuitBreakerConfigKey) {
		var config CircuitBreakerConfig
		deps.Default.Config.MustGetStruct(CircuitBreakerConfigKey, &config)
		parameters := config.Parameters
		// first checks if level exists in configurations then assigns parameters
		// if "default" qps level assigns default parameters from circuit breaker configurations
		if settings, ok := parameters[qpsLevel]; ok {
			if sleep, ok := settings["sleepWindowInMilliseconds"]; ok {
				sleepWindowInMilliseconds = sleep
			}
			if max, ok := settings["maxConcurrentRequests"]; ok {
				maxConcurrentRequests = max
			}
			if errorPercent, ok := settings["errorPercentThreshold"]; ok {
				errorPercentThreshold = errorPercent
			}
			if reqVolThreshold, ok := settings["requestVolumeThreshold"]; ok {
				requestVolumeThreshold = reqVolThreshold
			}
		}
	}
	// client settings override parameters
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.sleepWindowInMilliseconds") {
		sleepWindowInMilliseconds = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.sleepWindowInMilliseconds"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.maxConcurrentRequests") {
		maxConcurrentRequests = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.maxConcurrentRequests"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.errorPercentThreshold") {
		errorPercentThreshold = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.errorPercentThreshold"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.requestVolumeThreshold") {
		requestVolumeThreshold = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.requestVolumeThreshold"))
	}
	hystrix.ConfigureCommand(circuitBreakerName, hystrix.CommandConfig{
			MaxConcurrentRequests:  maxConcurrentRequests,
			ErrorPercentThreshold:  errorPercentThreshold,
			SleepWindow:            sleepWindowInMilliseconds,
			RequestVolumeThreshold: requestVolumeThreshold,
			Timeout:                timeoutVal,
		})
}

// HTTPClient returns the underlying HTTP client, should only be
// used for internal testing.
func (c *{{$clientName}}) HTTPClient() *zanzibar.HTTPClient {
	return c.httpClient
}

{{range $svc := .Services}}
{{range .Methods}}
{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
{{if $methodName -}}

// {{$methodName}} calls "{{.HTTPPath}}" endpoint.
func (c *{{$clientName}}) {{$methodName}}(
	ctx context.Context,
	headers map[string]string,
	{{if ne .RequestType "" -}}
	r {{.RequestType}},
	{{end -}}
) (context.Context, {{- if ne .ResponseType "" -}} {{.ResponseType}}, {{- end -}}map[string]string, error) {
	reqUUID := zanzibar.RequestUUIDFromCtx(ctx)
	if headers == nil {
		headers = make(map[string]string)
	}
	if reqUUID != "" {
		headers[c.requestUUIDHeaderKey] = reqUUID
	}
	if c.requestProcedureHeaderKey != "" {
		headers[c.requestProcedureHeaderKey] = "{{$serviceMethod}}"
	}

	{{if .ResponseType -}}
	var defaultRes  {{.ResponseType}}
	{{end -}}
	req := zanzibar.NewClientHTTPRequest(ctx, c.clientID, "{{$methodName}}", "{{$serviceMethod}}", c.httpClient)

	{{if .ReqHeaderGoStatements }}
	{{range $index, $line := .ReqClientHeaderGoStatements -}}
	{{$line}}
	{{end -}}
	{{- end}}

	{{if $sidecarRouter -}}
	headers[c.callerHeader] = c.callerName

	// Set the service name if dynamic routing header is present
	for routeHeaderKey, routeMap := range c.altRoutingMap {
		if headerVal, ok := headers[routeHeaderKey]; ok {
			for routeRegex, altServiceName := range routeMap {
				//if headerVal matches routeRegex regex, set the alternative service name
				if matchFound, _ := regexp.MatchString(routeRegex, headerVal); matchFound {
					headers[c.calleeHeader] = altServiceName
					break
				}
			}
		}
	}

	// If serviceName was not set in the dynamic routing section above, set as the default
	if _, ok := headers[c.calleeHeader]; !ok {
		headers[c.calleeHeader] = c.calleeName
	}
	{{end}}

	// Generate full URL.
	fullURL := c.httpClient.BaseURL
	{{- range $k, $segment := .PathSegments -}}
	{{- if eq $segment.Type "static" -}}+"/{{$segment.Text}}"
	{{- else -}}+"/"+string({{- if not $segment.Required }} * {{- end -}}r{{$segment.BodyIdentifier | title}})
	{{- end -}}
	{{- end}}

	{{range $index, $line := .WriteQueryParamGoStatements -}}
	{{$line}}
	{{end}}

	{{if (and (ne .RequestType "") (ne .HTTPMethod "GET"))}}
	{{if and (.RequestBoxed) (eq .BoxedRequestType "[]byte")}}
		err := req.WriteBytes("{{.HTTPMethod}}", fullURL, headers, r.{{.BoxedRequestName}})
	{{else}}
		err := req.WriteJSON("{{.HTTPMethod}}", fullURL, headers, {{if .RequestBoxed -}}r.{{.BoxedRequestName}}{{- else -}}r{{- end -}})
	{{end -}}
	{{else}}
	err := req.WriteJSON("{{.HTTPMethod}}", fullURL, headers, nil)
	{{end}} {{- /* <if .RequestType ne ""> */ -}}
	if err != nil {
		return {{if eq .ResponseType ""}}ctx, nil, err{{else}}ctx, defaultRes, nil, err{{end}}
	}

	{{if .ReqHeaders }}
	headerErr := req.CheckHeaders({{.ReqHeaders | printf "%#v"}})
	if headerErr != nil {
		return {{ if eq .ResponseType "" -}}
			ctx, nil, headerErr
			{{- else -}}
			ctx, defaultRes, nil, headerErr
			{{- end}}
	}
	{{- end}}

	var res *zanzibar.ClientHTTPResponse
	if (c.circuitBreakerDisabled) {
		res, err = req.Do()
	} else {
		// We want hystrix ckt-breaker to count errors only for system issues
		var clientErr error
		circuitBreakerName := "{{$clientID}}" + "-" + "{{$methodName}}"
		err = hystrix.DoC(ctx, circuitBreakerName, func(ctx context.Context) error {
			res, clientErr = req.Do()
			if res != nil {
				// This is not a system error/issue. Downstream responded
				return nil
			}
			return clientErr
		}, nil)
		if err == nil {
			// ckt-breaker was ok, bubble up client error if set
			err = clientErr
		}
	}
	if err != nil {
		return ctx, {{if eq .ResponseType ""}}nil, err{{else}}defaultRes, nil, err{{end}}
	}

	respHeaders := make(map[string]string)
	for k := range res.Header {
		respHeaders[k] = res.Header.Get(k)
	}

	defer func() {
		respHeaders[zanzibar.ClientResponseDurationKey] = res.Duration.String()
	}()

	{{- if .ResHeaders }}
	// TODO(jakev): verify mandatory response headers
	{{- end}}

	res.CheckOKResponse([]int{
		{{- range $index, $code := .ValidStatusCodes -}}
		{{if $index}},{{end}}{{$code}}
		{{- end -}}
	})

	{{if and (eq .ResponseType "") (eq (len .Exceptions) 0)}}
	switch res.StatusCode {
		case {{.OKStatusCode.Code}}:
			{{- if and (ne (.OKStatusCode.Code) 204) (ne (.OKStatusCode.Code) 304) -}}
			_, err = res.ReadAll()
			if err != nil {
				return ctx, respHeaders, err
			}
			{{- end}}
			return ctx, respHeaders, nil
		default:
			_, err = res.ReadAll()
			if err != nil {
				return ctx, respHeaders, err
			}
	}
	{{else if eq (len .Exceptions) 0}}
	switch res.StatusCode {
		case {{.OKStatusCode.Code}}:
		{{- if or (eq (.OKStatusCode.Code) 204) (eq (.OKStatusCode.Code) 304) -}}
			return ctx, {{if isPointerType .ResponseType}}&{{end}}{{unref .ResponseType}}{}, respHeaders, nil
		{{- else }}
		{{- if eq .ResponseType "[]byte"}}
		responseBody, err := res.ReadAll()
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}
		return ctx, responseBody, respHeaders, nil
		{{ else }}
		var responseBody {{unref .ResponseType}}
		rawBody, err := res.ReadAll()
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}
		err = res.UnmarshalBody(&responseBody, rawBody)
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}

		{{- if .ResHeaderFields }}
			// TODO(jakev): read response headers and put them in body
		{{- end}}

		return ctx, {{if isPointerType .ResponseType}}&{{end}}responseBody, respHeaders, nil
		{{end -}}
		{{end -}}
		default:
			_, err = res.ReadAll()
			if err != nil {
				return ctx, defaultRes, respHeaders, err
			}
	}
	{{else if eq .ResponseType ""}}
	switch res.StatusCode {
		case {{.OKStatusCode.Code}}:
			{{- if and (ne (.OKStatusCode.Code) 204) (ne (.OKStatusCode.Code) 304) -}}
			_, err = res.ReadAll()
			if err != nil {
				return ctx, respHeaders, err
			}
			{{- end}}

			return ctx, respHeaders, nil
		{{range $code, $exceptions := .ExceptionsByStatusCode -}}
		case {{$code}}:
			{{- if or (eq $code 204) (eq $code 304) }}
				{{/* If multiple exceptions have 204/304 status code mapped, we aren't able to distinguish between them */}}
				{{/* so we'll just return the first exception that has 204/304 status code set. */}}
				{{$val := index $exceptions 0}}
				return ctx, respHeaders, &{{$val.Type}}{}
			{{ else if and (eq (len $exceptions) 1) (eq  (index $exceptions 0).IsBodyDisallowed true) -}}
				{{$val := index $exceptions 0}}
				return ctx, respHeaders, &{{$val.Type}}{}
			{{else}}
			allOptions := []interface{}{
			{{range $idx, $exception := $exceptions -}}
				&{{$exception.Type}}{},
			{{- end}}
			}
			v, err := res.ReadAndUnmarshalBodyMultipleOptions(allOptions)
			if err != nil {
				return ctx, respHeaders, err
			}
			return ctx, respHeaders, v.(error)
			{{end}}
		{{- end}}
		default:
			_, err = res.ReadAll()
			if err != nil {
				return ctx, respHeaders, err
			}
	}
	{{else}}

	switch res.StatusCode {
		case {{.OKStatusCode.Code}}:
		{{- if or (eq (.OKStatusCode.Code) 204) (eq (.OKStatusCode.Code) 304) }}
			return ctx, {{if isPointerType .ResponseType}}&{{end}}{{unref .ResponseType}}{}, respHeaders, nil
		{{- else }}
		{{- if eq .ResponseType "[]byte"}}
		responseBody, err := res.ReadAll()
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}
		return ctx, responseBody, respHeaders, nil
		{{ else }}
		var responseBody {{unref .ResponseType}}
		rawBody, err := res.ReadAll()
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}
		err = res.UnmarshalBody(&responseBody, rawBody)
		if err != nil {
			return ctx, defaultRes, respHeaders, err
		}

		{{- if .ResHeaderFields }}
			// TODO(jakev): read response headers and put them in body
		{{- end}}

		return ctx, {{if isPointerType .ResponseType}}&{{end}}responseBody, respHeaders, nil
		{{end -}}
		{{end}}
		{{range $code, $exceptions := .ExceptionsByStatusCode -}}
		case {{$code}}:
			{{- if or (eq $code 204) (eq $code 304) }}
				{{/* If multiple exceptions have 204/304 status code mapped, we aren't able to distinguish between them */}}
				{{/* so we'll just return the first exception that has 204/304 status code set. */}}
				{{$val := index $exceptions 0}}
				return ctx, defaultRes, respHeaders, &{{$val.Type}}{}
			{{ else if and (eq (len $exceptions) 1) (eq  (index $exceptions 0).IsBodyDisallowed true) -}}
				{{$val := index $exceptions 0}}
				return ctx, defaultRes, respHeaders, &{{$val.Type}}{}
			{{else}}
			allOptions := []interface{}{
				{{range $idx, $exception := $exceptions -}}
				&{{$exception.Type}}{},
				{{- end}}
			}
			v, err := res.ReadAndUnmarshalBodyMultipleOptions(allOptions)
			if err != nil {
				return ctx, defaultRes, respHeaders, err
			}
			return ctx, defaultRes, respHeaders, v.(error)
			{{end}}
		{{- end}}
		default:
			_, err = res.ReadAll()
			if err != nil {
				return ctx, defaultRes, respHeaders, err
			}
	}
	{{end}}

	return ctx, {{if ne .ResponseType ""}}defaultRes, {{end}}respHeaders, &zanzibar.UnexpectedHTTPError{
		StatusCode: res.StatusCode,
		RawBody: res.GetRawBody(),
	}
}
{{end}}
{{end}}
{{end}}
`)

func http_client_testTmplBytes() ([]byte, error) {
	return _http_client_testTmpl, nil
}

func http_client_testTmpl() (*asset, error) {
	bytes, err := http_client_testTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "http_client_test.tmpl", size: 19602, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _mainTmpl = []byte(`{{- /* template to render gateway main.go */ -}}
{{- $instance := . -}}

package main

import (
	"bytes"
	"context"
	"flag"
	"strings"

	"github.com/uber/zanzibar/config"

	"github.com/pkg/errors"

	_ "go.uber.org/automaxprocs"
	"go.uber.org/fx"
	"go.uber.org/zap"

	zanzibar "github.com/uber/zanzibar/runtime"

	app "{{$instance.PackageInfo.PackageRoot}}"
	service "{{$instance.PackageInfo.GeneratedPackagePath}}"
	module "{{$instance.PackageInfo.ModulePackagePath}}"
	uberconfig "go.uber.org/config"
)

var configFiles *string

// Module defines the Zanzibar application module for {{$instance.InstanceName | pascal}}
var Module = fx.Options(
	fx.Provide(New),
	fx.Invoke(run),
)

func opts() fx.Option {
	return fx.Options(
		append(
			[]fx.Option{Module},
			app.GetOverrideFxOptions()...,
		)...,
	)
}

// Params defines the dependencies of the New module.
type Params struct {
	fx.In
	Lifecycle fx.Lifecycle
}

// Result defines the objects that the New module provides
type Result struct {
	fx.Out
	// Gateway corresponds to the fully built server gateway
	Gateway *zanzibar.Gateway
	// Provider is an abstraction over the Zanzibar config store
	Provider uberconfig.Provider ` + "`" + `name:"zanzibarConfig"` + "`" + `
	// Deps is a reference to the dependency tree inside zanzibar gateway
	Deps *service.DependenciesTree
}

func main() {
	fx.New(opts()).Run()
}

// run is the main entry point for {{$instance.InstanceName | pascal}}
func run(gateway *zanzibar.Gateway) {
	gateway.Logger.Info("Started {{$instance.InstanceName | pascal}}",
		zap.String("realHTTPAddr", gateway.RealHTTPAddr),
		zap.String("realTChannelAddr", gateway.RealTChannelAddr),
		zap.Any("config", gateway.InspectOrDie()),
	)
}

// New exports functionality similar to Module, but allows the caller to wrap
// or modify Result. Most users should use Module instead.
func New(p Params) (Result, error) {
	readFlags()
	gateway, deps, err := createGateway()
	if err != nil {
		return Result{}, errors.Wrap(err, "failed to create gateway server")
	}

	// Represent the zanzibar config in YAML that will be used to expose a config provider
	yamlCfg, err := gateway.Config.AsYaml()
	if err != nil {
		return Result{}, errors.Wrap(err, "unable to marshal Zanzibar config to YAML")
	}
	provider, err := uberconfig.NewYAML(
		[]uberconfig.YAMLOption{
			uberconfig.Source(bytes.NewReader(yamlCfg)),
		}...,
	)
	if err != nil {
		return Result{}, errors.Wrap(err, "unable to provide a YAML view from Zanzibar config")
	}

	p.Lifecycle.Append(fx.Hook{
		OnStart: func(ctx context.Context) error {
			err = gateway.Bootstrap()
			if err != nil {
				panic(errors.Wrap(err, "failed to bootstrap gateway server"))
			}
			return nil
		},
		OnStop: func(ctx context.Context) error {
			gateway.Logger.Info("fx OnStop() hook activated")
			gateway.WaitGroup.Add(1)
			gateway.Shutdown()
			gateway.WaitGroup.Done()
			return nil
		},
	})

	return Result{
		Gateway: gateway,
		Provider: provider,
		Deps: deps,
	}, nil
}

func createGateway() (*zanzibar.Gateway, *service.DependenciesTree, error) {
	cfg := getConfig()
	gateway, deps, err := service.CreateGateway(cfg, app.AppOptions)
	if err != nil {
		return nil, nil, err
	}
	return gateway, deps.(*service.DependenciesTree), nil
}

func getConfig() *zanzibar.StaticConfig {
	var files []string

	if configFiles == nil {
		files = []string{}
	} else {
		files = strings.Split(*configFiles, ";")
	}

	return config.NewRuntimeConfigOrDie(files, nil)
}

func readFlags() {
	configFiles = flag.String(
		"config",
		"",
		"an ordered, semi-colon separated list of configuration files to use",
	)
	flag.Parse()
}
`)

func mainTmplBytes() ([]byte, error) {
	return _mainTmpl, nil
}

func mainTmpl() (*asset, error) {
	bytes, err := mainTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "main.tmpl", size: 3608, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _main_testTmpl = []byte(`{{- /* template to render gateway main_test.go 
This template is the test entrypoint for spawning a gateway
as a child process using the test coverage features etc.
*/ -}}
{{- $instance := . -}}

package main

import (
	"flag"
	"os"
	"os/signal"
	"syscall"
	"testing"

	"github.com/stretchr/testify/assert"
	zanzibar "github.com/uber/zanzibar/runtime"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"

	module "{{$instance.PackageInfo.ModulePackagePath}}"
)

var cachedServer *zanzibar.Gateway

func TestMain(m *testing.M) {
	readFlags()
	if os.Getenv("GATEWAY_RUN_CHILD_PROCESS_TEST") != "" {
		listenOnSignals()

		code := m.Run()
		os.Exit(code)
	} else {
		os.Exit(0)
	}
}

func listenOnSignals() {
	sigs := make(chan os.Signal, 1)

	signal.Notify(sigs, syscall.SIGUSR2)

	go func() {
		<-sigs

		if cachedServer != nil {
			cachedServer.Close()
		}
	}()
}

func TestStartGateway(t *testing.T) {
	testLogger := zap.New(
		zapcore.NewCore(
			zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig()),
			os.Stderr,
			zap.DebugLevel,
		),
	)

	gateway, deps, err := createGateway()
	if err != nil {
		testLogger.Error(
			"Failed to CreateGateway in TestStartGateway()",
			zap.Error(err),
		)
		return
	}
	assert.NotNil(t, deps)

	cachedServer = gateway
	err = gateway.Bootstrap()
	if err != nil {
		testLogger.Error(
			"Failed to Bootstrap in TestStartGateway()",
			zap.Error(err),
		)
		return
	}
	logAndWait(gateway)
}

func logAndWait(server *zanzibar.Gateway) {
	server.Logger.Info("Started {{$instance.InstanceName | pascal}}",
		zap.String("realHTTPAddr", server.RealHTTPAddr),
		zap.String("realTChannelAddr", server.RealTChannelAddr),
		zap.Any("config", server.InspectOrDie()),
	)

	go func(){
		sig := make(chan os.Signal, 1)
		signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
		<-sig
		server.WaitGroup.Add(1)
		server.Shutdown()
		server.WaitGroup.Done()
	}()
	server.Wait()
}
`)

func main_testTmplBytes() ([]byte, error) {
	return _main_testTmpl, nil
}

func main_testTmpl() (*asset, error) {
	bytes, err := main_testTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "main_test.tmpl", size: 1896, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _middleware_httpTmpl = []byte(`{{$instance := . -}}

package {{$instance.PackageInfo.PackageName}}

import (
	zanzibar "github.com/uber/zanzibar/runtime"
	module "{{$instance.PackageInfo.ModulePackagePath}}"
	handle "{{index .Config "path"}}"
)

// Middleware is a container for module.Deps and factory for MiddlewareHandle
type Middleware struct {
	Deps *module.Dependencies
}

// NewMiddleware is a factory method for the struct
func NewMiddleware(deps *module.Dependencies) Middleware {
	return Middleware {
		Deps: deps,
	}
}

// NewMiddlewareHandle calls back to the custom middleware to build a MiddlewareHandle
func (m *Middleware) NewMiddlewareHandle(o handle.Options) zanzibar.MiddlewareHandle {
	return handle.NewMiddleware(m.Deps, o)
}


`)

func middleware_httpTmplBytes() ([]byte, error) {
	return _middleware_httpTmpl, nil
}

func middleware_httpTmpl() (*asset, error) {
	bytes, err := middleware_httpTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "middleware_http.tmpl", size: 718, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _middleware_tchannelTmpl = []byte(`{{$instance := . -}}

package {{$instance.PackageInfo.PackageName}}

import (
	zanzibar "github.com/uber/zanzibar/runtime"
	module "{{$instance.PackageInfo.ModulePackagePath}}"
	handle "{{index .Config "path"}}"
)

// Middleware is a container for module.Deps and factory for MiddlewareHandle
type Middleware struct {
	Deps *module.Dependencies
}

// NewMiddleware is a factory method for the struct
func NewMiddleware(deps *module.Dependencies) Middleware {
	return Middleware {
		Deps: deps,
	}
}

// NewMiddlewareHandle calls back to the custom middleware to build a MiddlewareHandle
func (m *Middleware) NewMiddlewareHandle(o handle.Options) zanzibar.MiddlewareTchannelHandle {
	return handle.NewMiddleware(m.Deps, o)
}


`)

func middleware_tchannelTmplBytes() ([]byte, error) {
	return _middleware_tchannelTmpl, nil
}

func middleware_tchannelTmpl() (*asset, error) {
	bytes, err := middleware_tchannelTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "middleware_tchannel.tmpl", size: 726, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _module_class_initializerTmpl = []byte(`{{- $className := index . 0 }}
{{- $instance := index . 1 }}

{{- $moduleInstances := (index $instance.RecursiveDependencies $className)}}
{{- $initializedDeps := printf "initialized%sDependencies" (title $className) }}

{{- if eq (len .) 3 }}
{{$initializedDeps}} := &{{index . 2}}.{{$className | title}}DependenciesNodes{}
{{- else }}
{{$initializedDeps}} := &{{$className | title}}DependenciesNodes{}
{{- end }}
tree.{{$className | title}} = {{$initializedDeps}}

{{- range $idx, $dependency := $moduleInstances}}
	{{- $pkgInfo := $dependency.PackageInfo }}
	{{$initializedDeps}}.{{$pkgInfo.QualifiedInstanceName}} = {{$pkgInfo.ImportPackageAlias}}.{{$pkgInfo.ExportName}}(&{{$pkgInfo.ModulePackageAlias}}.Dependencies{
	Default: initializedDefaultDependencies,
	{{- range $className, $moduleInstances := $dependency.ResolvedDependencies}}
	{{$className | pascal}}: &{{$pkgInfo.ModulePackageAlias}}.{{$className | pascal}}Dependencies{
		{{- range $idy, $subDependency := $moduleInstances}}
		{{$subDependency.PackageInfo.QualifiedInstanceName}}: initialized{{$className | pascal}}Dependencies.{{$subDependency.PackageInfo.QualifiedInstanceName}},
		{{- end}}
	},
	{{- end}}
})
{{- end}}
`)

func module_class_initializerTmplBytes() ([]byte, error) {
	return _module_class_initializerTmpl, nil
}

func module_class_initializerTmpl() (*asset, error) {
	bytes, err := module_class_initializerTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "module_class_initializer.tmpl", size: 1191, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _module_initializerTmpl = []byte(`{{$instance := . -}}

package module

import (
	{{range $classType, $moduleInstances := $instance.RecursiveDependencies -}}
	{{range $idx, $moduleInstance := $moduleInstances -}}
	{{$moduleInstance.PackageInfo.ImportPackageAlias}} "{{$moduleInstance.PackageInfo.ImportPackagePath}}"
	{{$moduleInstance.PackageInfo.ModulePackageAlias}} "{{$moduleInstance.PackageInfo.ModulePackagePath}}"
	{{end -}}
	{{end}}

	zanzibar "github.com/uber/zanzibar/runtime"
)

// DependenciesTree contains all deps for this service.
type DependenciesTree struct {
	{{range $idx, $className := $instance.DependencyOrder -}}
	{{$className | title}} *{{$className | title}}DependenciesNodes
	{{end -}}
}

{{range $idx, $className := $instance.DependencyOrder -}}
{{$moduleInstances := (index $instance.RecursiveDependencies $className) -}}
// {{$className | title}}DependenciesNodes contains {{$className}} dependencies
type {{$className | title}}DependenciesNodes struct {
	{{ range $idx, $dependency := $moduleInstances -}}
	{{$dependency.PackageInfo.QualifiedInstanceName}} {{$dependency.PackageInfo.ImportPackageAlias}}.{{$dependency.PackageInfo.ExportType}}
	{{end -}}
}
{{end -}}

// InitializeDependencies fully initializes all dependencies in the dep tree
// for the {{$instance.InstanceName}} {{$instance.ClassName}}
func InitializeDependencies(
	g *zanzibar.Gateway,
) (*DependenciesTree, *Dependencies) {
	tree := &DependenciesTree{}

	initializedDefaultDependencies := &zanzibar.DefaultDependencies{
		Logger:               g.Logger,
		ContextExtractor:     g.ContextExtractor,
		ContextLogger:        g.ContextLogger,
		ContextMetrics:       zanzibar.NewContextMetrics(g.RootScope),
		Scope:                g.RootScope,
		Tracer:               g.Tracer,
		Config:               g.Config,
		ServerTChannel:       g.ServerTChannel,
		Gateway:              g,
		GRPCClientDispatcher: g.GRPCClientDispatcher,
		JSONWrapper:		  g.JSONWrapper,
	}

	{{range $idx, $className := $instance.DependencyOrder}}
	{{template "module_class_initializer.tmpl" args $className $instance}}
	{{end}}

	dependencies := &Dependencies{
		Default: initializedDefaultDependencies,
		{{- range $className, $moduleInstances := $instance.ResolvedDependencies}}
		{{$className | pascal}}: &{{$className | pascal}}Dependencies{
			{{- range $idy, $subDependency := $moduleInstances}}
			{{$subDependency.PackageInfo.QualifiedInstanceName}}: initialized{{$className | pascal}}Dependencies.{{$subDependency.PackageInfo.QualifiedInstanceName}},
			{{- end}}
		},
		{{- end}}
	}

	return tree, dependencies
}
`)

func module_initializerTmplBytes() ([]byte, error) {
	return _module_initializerTmpl, nil
}

func module_initializerTmpl() (*asset, error) {
	bytes, err := module_initializerTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "module_initializer.tmpl", size: 2564, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _module_mock_initializerTmpl = []byte(`{{$instance := .Instance -}}
{{$leafWithFixture := .LeafWithFixture -}}
{{$leafClass := firstIsClientOrEmpty $instance.DependencyOrder -}}
{{$mockDeps := printf "Mock%sNodes" (title $leafClass) -}}
{{$classPkg := "module" -}}

package {{$instance.PackageInfo.GeneratedPackageAlias}}mock

import (
	"testing"

	"github.com/golang/mock/gomock"
	zanzibar "github.com/uber/zanzibar/runtime"
	{{$classPkg}} "{{$instance.PackageInfo.ModulePackagePath}}"

	{{range $classType, $moduleInstances := $instance.RecursiveDependencies -}}
	{{range $idx, $moduleInstance := $moduleInstances -}}
	{{if eq $classType $leafClass -}}
	{{$moduleInstance.PackageInfo.GeneratedPackageAlias}} "{{$moduleInstance.PackageInfo.GeneratedPackagePath}}/mock-client"
	{{if (index $leafWithFixture $moduleInstance.InstanceName) -}}
	fixture{{$moduleInstance.PackageInfo.ImportPackageAlias}} "{{index $leafWithFixture $moduleInstance.InstanceName}}"
	{{end -}}
	{{else -}}
	{{$moduleInstance.PackageInfo.ImportPackageAlias}} "{{$moduleInstance.PackageInfo.ImportPackagePath}}"
	{{$moduleInstance.PackageInfo.ModulePackageAlias}} "{{$moduleInstance.PackageInfo.ModulePackagePath}}"
	{{end -}}
	{{end -}}
	{{end}}
)

{{$moduleInstances := (index $instance.RecursiveDependencies $leafClass) -}}
// {{$mockDeps}} contains mock {{$leafClass}} dependencies
type {{$mockDeps}} struct {
	{{ range $idx, $dependency := $moduleInstances -}}
	{{- if (index $leafWithFixture $dependency.InstanceName) }}
	{{$dependency.PackageInfo.QualifiedInstanceName}} *{{$dependency.PackageInfo.GeneratedPackageAlias}}.Mock{{$dependency.PackageInfo.ExportType}}WithFixture
	{{- else }}
	{{$dependency.PackageInfo.QualifiedInstanceName}} *{{$dependency.PackageInfo.GeneratedPackageAlias}}.Mock{{$dependency.PackageInfo.ExportType}}
	{{- end }}
	{{- end}}
}

// InitializeDependenciesMock fully initializes all dependencies in the dep tree
// for the {{$instance.InstanceName}} {{$instance.ClassName}} with leaf nodes being mocks
func InitializeDependenciesMock(
	g *zanzibar.Gateway,
	ctrl *gomock.Controller,
) (*{{$classPkg}}.DependenciesTree, *{{$classPkg}}.Dependencies, *{{$mockDeps}}) {
	tree := &{{$classPkg}}.DependenciesTree{}

	{{ if eq $leafClass "" -}}
	{{camel $mockDeps}} := &{{$mockDeps}}{}
	{{ end -}}

	initializedDefaultDependencies := &zanzibar.DefaultDependencies{
		ContextExtractor:     g.ContextExtractor,
		ContextMetrics:       g.ContextMetrics,
		ContextLogger:        g.ContextLogger,
		Logger:               g.Logger,
		Scope:                g.RootScope,
		Config:               g.Config,
		ServerTChannel:   	  g.ServerTChannel,
		Tracer:               g.Tracer,
		GRPCClientDispatcher: g.GRPCClientDispatcher,
		JSONWrapper:          g.JSONWrapper,
	}

	{{range $idx, $className := $instance.DependencyOrder}}
	{{if eq $className $leafClass -}}
	{{- $moduleInstances := (index $instance.RecursiveDependencies $className)}}
	{{camel $mockDeps}} := &{{$mockDeps}}{
		{{- range $idx, $dependency := $moduleInstances}}
		{{- $pkgInfo := $dependency.PackageInfo }}
		{{- if (index $leafWithFixture $dependency.InstanceName) }}
		{{$pkgInfo.QualifiedInstanceName}}: {{$pkgInfo.GeneratedPackageAlias}}.New(ctrl, fixture{{$pkgInfo.ImportPackageAlias}}.Fixture),
		{{- else }}
		{{$pkgInfo.QualifiedInstanceName}}: {{$pkgInfo.GeneratedPackageAlias}}.NewMock{{title $className}}(ctrl),
		{{- end }}
		{{- end }}
	}
	{{- $initializedDeps := printf "initialized%sDependencies" (title $className) }}
	{{$initializedDeps}} := &{{$classPkg}}.{{$className | title}}DependenciesNodes{}
	tree.{{$className | title}} = {{$initializedDeps}}
	{{- range $idx, $dependency := $moduleInstances}}
	{{- $pkgInfo := $dependency.PackageInfo }}
	{{$initializedDeps}}.{{$pkgInfo.QualifiedInstanceName}} = {{camel $mockDeps}}.{{$pkgInfo.QualifiedInstanceName}}
	{{- end }}
	{{else -}}
	{{template "module_class_initializer.tmpl" args $className $instance $classPkg}}
	{{end}}
	{{end}}

	dependencies := &{{$classPkg}}.Dependencies{
		Default: initializedDefaultDependencies,
		{{- range $className, $moduleInstances := $instance.ResolvedDependencies}}
		{{$className | pascal}}: &{{$classPkg}}.{{$className | pascal}}Dependencies{
			{{- range $idy, $subDependency := $moduleInstances}}
			{{$subDependency.PackageInfo.QualifiedInstanceName}}: initialized{{$className | pascal}}Dependencies.{{$subDependency.PackageInfo.QualifiedInstanceName}},
			{{- end}}
		},
		{{- end}}
	}

	return tree, dependencies, {{camel $mockDeps}}
}
`)

func module_mock_initializerTmplBytes() ([]byte, error) {
	return _module_mock_initializerTmpl, nil
}

func module_mock_initializerTmpl() (*asset, error) {
	bytes, err := module_mock_initializerTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "module_mock_initializer.tmpl", size: 4471, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _serviceTmpl = []byte(`{{- /* template to render gateway main.go */ -}}
{{- $instance := . -}}

package {{$instance.PackageInfo.GeneratedPackageAlias}}

import (
	"os"
	"path/filepath"

	"go.uber.org/zap"
	zanzibar "github.com/uber/zanzibar/runtime"

	module "{{$instance.PackageInfo.ModulePackagePath}}"
)

// DependenciesTree re-exported for convenience.
type DependenciesTree module.DependenciesTree

// CreateGateway creates a new instances of the {{$instance.InstanceName}}
// service with the specified config
func CreateGateway(
	config *zanzibar.StaticConfig,
	opts *zanzibar.Options,
) (*zanzibar.Gateway, interface{}, error) {
	gateway, err := zanzibar.CreateGateway(config, opts)
	if err != nil {
		return nil, nil, err
	}

	tree, dependencies := module.InitializeDependencies(gateway)
	registerErr := RegisterDeps(gateway, dependencies)
	if registerErr != nil {
		return nil, nil, registerErr
	}

	return gateway, (*DependenciesTree)(tree), nil
}

// RegisterDeps registers direct dependencies of the service
func RegisterDeps(g *zanzibar.Gateway, deps *module.Dependencies) error {
	//lint:ignore S1021 allow less concise variable declaration for ease of code generation
	var err error
	{{- range $class, $instances := $instance.ResolvedDependencies }}
	{{- range $idx, $instance := $instances }}
	err = deps.{{title $class}}.{{$instance.PackageInfo.QualifiedInstanceName}}.Register(g)
	if err != nil {
		return err
	}
	{{- end}}
	{{- end}}
	return nil
}
`)

func serviceTmplBytes() ([]byte, error) {
	return _serviceTmpl, nil
}

func serviceTmpl() (*asset, error) {
	bytes, err := serviceTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "service.tmpl", size: 1445, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _service_mockTmpl = []byte(`{{- $instance := .Instance -}}
{{- $defaultTestConfigPath := .TestConfigPath -}}
{{- $leafClass := firstIsClientOrEmpty $instance.DependencyOrder -}}
{{- $mockType := printf "Mock%sNodes" (title $leafClass) -}}
{{- $mock := printf "Mock%ss" (title $leafClass) -}}

package {{$instance.PackageInfo.GeneratedPackageAlias}}mock

import (
	"context"
	"errors"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"testing"
	"time"


	"github.com/golang/mock/gomock"
	"github.com/uber/zanzibar/config"
	zanzibar "github.com/uber/zanzibar/runtime"

	service "{{$instance.PackageInfo.GeneratedPackagePath}}"
)

// MockService interface
type MockService interface {
	MakeHTTPRequest(
		method string,
		url string,
		headers map[string]string,
		body io.Reader,
	) (*http.Response, error)
	MakeTChannelRequest(
		ctx context.Context,
		thriftService string,
		method string,
		headers map[string]string,
		req, resp zanzibar.RWTStruct,
	) (bool, map[string]string, error)
	{{$mock}}() *{{$mockType}}
	Server() *zanzibar.Gateway
	Start()
	Stop()
}

type mockService struct {
	started        bool
	server         *zanzibar.Gateway
	ctrl           *gomock.Controller
	{{camel $mock}}    *{{$mockType}}
	httpClient     *http.Client
	tChannelClient zanzibar.TChannelCaller
}

// MustCreateTestService creates a new MockService, panics if it fails doing so.
// Optional testConfigPaths specifies runtime config files used in tests, it
// should be paths that are relative to "$GOPATH/src".
// If testConfigPaths is absent, a default test config file is used.
// The default test config file is chosen base on existence in order below:
// - "../../config/test.yaml" where current dir is the dir of service-config.yaml for the mocked service
// - "config/test.yaml" where current dir is the project root
func MustCreateTestService(t *testing.T, testConfigPaths ...string) MockService {
	if len(testConfigPaths) == 0 {
		configPath := filepath.Join("src", "{{$defaultTestConfigPath}}")
		defaultPath := filepath.Join(os.Getenv("GOPATH"), configPath)

		// This is a temporary solution for running tests using bazel
		// see https://docs.bazel.build/versions/master/test-encyclopedia.html for relevant env vars
		// TODO: need long term solution to avoid hardcoding bazel specifics
		bazelPath := filepath.Join(os.Getenv("TEST_SRCDIR"), os.Getenv("TEST_WORKSPACE"), configPath)

		testConfigPaths = append(
			testConfigPaths,
			defaultPath,
			bazelPath,
		)
	}
	c := config.NewRuntimeConfigOrDie(testConfigPaths, nil)

	server, err := zanzibar.CreateGateway(c, nil)
	if err != nil {
		panic(err)
	}

	ctrl := gomock.NewController(t)
	_, dependencies, mockNodes := InitializeDependenciesMock(server, ctrl)
	registerErr := service.RegisterDeps(server, dependencies)
	if registerErr != nil {
		panic(registerErr)
	}

	httpClient := &http.Client{
		Transport: &http.Transport{
			DisableKeepAlives:   false,
			MaxIdleConns:        500,
			MaxIdleConnsPerHost: 500,
		},
	}

	// TChannel clients must have a timeout defined, so defining a long timeout that should not realistically
	// be hit in tests.
	timeout := time.Duration(5) * time.Minute
	timeoutPerAttempt := time.Duration(1) * time.Minute

	tchannelClient := zanzibar.NewRawTChannelClient(
		server.ServerTChannel,
		server.ContextLogger,
		server.RootScope,
		&zanzibar.TChannelClientOption{
			ServiceName:       server.ServiceName,
			ClientID:          "TestClient",
			Timeout:           timeout,
			TimeoutPerAttempt: timeoutPerAttempt,
		},
	)

	return &mockService{
		server:         		server,
		ctrl:                   ctrl,
		{{camel $mock}}:        mockNodes,
		httpClient:     		httpClient,
		tChannelClient: 		tchannelClient,
	}
}

// Server returns the mock server
func (m *mockService) Server() *zanzibar.Gateway {
	return m.server
}

// Start starts the mock server, panics if fails doing so
func (m *mockService) Start() {
	if err := m.server.Bootstrap(); err != nil {
		panic(err)
	}
	m.started = true
}

// Stop stops the mock server
func (m *mockService) Stop() {
	// m.ctrl.Finish() calls runtime.Goexit() on errors
	// put it in defer so cleanup is always done
	defer func(){
		m.server.Shutdown()
		m.started = false
	}()
	m.ctrl.Finish()
}

// {{$mock}} returns the mock {{$leafClass}}s
func (m *mockService) {{$mock}}() *{{$mockType}} {
	return m.{{camel $mock}}
}

// MakeHTTPRequest makes a HTTP request to the mock server
func (m *mockService) MakeHTTPRequest(
	method string,
	url string,
	headers map[string]string,
	body io.Reader,
) (*http.Response, error) {
	if !m.started {
		return nil, errors.New("mock server is not started")
	}

	client := m.httpClient

	fullURL := "http://" + m.server.RealHTTPAddr + url

	req, err := http.NewRequest(method, fullURL, body)
	for headerName, headerValue := range headers {
		req.Header.Set(headerName, headerValue)
	}

	if err != nil {
		return nil, err
	}

	return client.Do(req)
}

// MakeTChannelRequest makes a TChannel request to the mock server
func (m *mockService) MakeTChannelRequest(
	ctx context.Context,
	thriftService string,
	method string,
	headers map[string]string,
	req, res zanzibar.RWTStruct,
) (bool, map[string]string, error) {
	if !m.started {
		return false, nil, errors.New("mock server is not started")
	}

	sc := m.server.ServerTChannel.GetSubChannel(m.server.ServiceName)
	sc.Peers().Add(m.server.RealTChannelAddr)
	return m.tChannelClient.Call(ctx, thriftService, method, headers, req, res)
}
`)

func service_mockTmplBytes() ([]byte, error) {
	return _service_mockTmpl, nil
}

func service_mockTmpl() (*asset, error) {
	bytes, err := service_mockTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "service_mock.tmpl", size: 5424, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _structsTmpl = []byte(`{{- /* template to render edge gateway http client code */ -}}

{{- $instance := .Instance }}
package {{$instance.PackageInfo.PackageName}}

import (
	"runtime"
	"path/filepath"

	zanzibar "github.com/uber/zanzibar/runtime"
	{{range $idx, $pkg := .Spec.IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
)

func getDirName() string {
	_, file, _, _ := runtime.Caller(0)
	return zanzibar.GetDirnameFromRuntimeCaller(file)
}
`)

func structsTmplBytes() ([]byte, error) {
	return _structsTmpl, nil
}

func structsTmpl() (*asset, error) {
	bytes, err := structsTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "structs.tmpl", size: 445, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _tchannel_clientTmpl = []byte(`{{- /* template to render edge gateway tchannel client code */ -}}
{{- $instance := .Instance }}
package {{$instance.PackageInfo.PackageName}}

import (
	"context"
	"errors"
	"strconv"
	"strings"
	"time"
	"net/textproto"

	"github.com/afex/hystrix-go/hystrix"
	"github.com/uber/tchannel-go"
	zanzibar "github.com/uber/zanzibar/runtime"
	"github.com/uber/tchannel-go"
	"github.com/uber/zanzibar/config"
	"github.com/uber/zanzibar/runtime/ruleengine"


	"go.uber.org/zap"

	module "{{$instance.PackageInfo.ModulePackagePath}}"
	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
)

{{$clientID := .ClientID -}}
{{$exposedMethods := .ExposedMethods -}}
{{$QPSLevels := .QPSLevels -}}
{{- $clientName := printf "%sClient" (camel $clientID) }}
{{- $exportName := .ExportName}}
{{- $sidecarRouter := .SidecarRouter}}

// CircuitBreakerConfigKey is key value for qps level to circuit breaker parameters mapping
const CircuitBreakerConfigKey = "circuitbreaking-configurations"

var logFieldErrLocation = zanzibar.LogFieldErrorLocation("client::{{$instance.InstanceName}}")

// Client defines {{$clientID}} client interface.
type Client interface {
{{range $svc := .Services -}}
{{range .Methods}}
{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
{{- if $methodName -}}
	{{$methodName}}(
		ctx context.Context,
		reqHeaders map[string]string,
		{{if ne .RequestType "" -}}
		args {{.RequestType}},
		{{end -}}
	) (context.Context, {{- if ne .ResponseType "" -}} {{.ResponseType}}, {{- end -}}map[string]string, error)
{{- end -}}
{{- end -}}
{{- end -}}
}

// NewClient returns a new TChannel client for service {{$clientID}}.
func {{$exportName}}(deps *module.Dependencies) Client {
	{{- /* this is the service discovery service name */}}
	serviceName := deps.Default.Config.MustGetString("clients.{{$clientID}}.serviceName")
	var routingKey string
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.routingKey") {
		routingKey = deps.Default.Config.MustGetString("clients.{{$clientID}}.routingKey")
	}
	var requestUUIDHeaderKey string
	if deps.Default.Config.ContainsKey("tchannel.clients.requestUUIDHeaderKey") {
		requestUUIDHeaderKey = deps.Default.Config.MustGetString("tchannel.clients.requestUUIDHeaderKey")
	}

	{{if $sidecarRouter -}}
		ip := deps.Default.Config.MustGetString("sidecarRouter.{{$sidecarRouter}}.tchannel.ip")
		port := deps.Default.Config.MustGetInt("sidecarRouter.{{$sidecarRouter}}.tchannel.port")
	{{else -}}
		ip := deps.Default.Config.MustGetString("clients.{{$clientID}}.ip")
		port := deps.Default.Config.MustGetInt("clients.{{$clientID}}.port")
	{{end -}}

	gateway := deps.Default.Gateway
	var channel *tchannel.Channel

	// If dedicated.tchannel.client : true, each tchannel client will create a
	// dedicated connection with local sidecar, else it will use a shared connection
	if deps.Default.Config.ContainsKey("dedicated.tchannel.client") &&
		deps.Default.Config.MustGetBoolean("dedicated.tchannel.client") {
		channel = gateway.SetupClientTChannel(deps.Default.Config, serviceName)
		channel.Peers().Add(ip + ":" + strconv.Itoa(int(port)))
	} else {
		channel = gateway.ServerTChannel
		channel.GetSubChannel(serviceName, tchannel.Isolated).Peers().Add(ip + ":" + strconv.Itoa(int(port)))
	}

	/*Ex:
	{
		"clients.rider-presentation.alternates": {
			"routingConfigs": [
				{
					"headerName": "x-test-env",
					"headerValue": "*",
					"serviceName": "testservice"
				},
				{
					"headerName": "x-container",
					"headerValue": "container*",
					"serviceName": "relayer"
				}
			],
			"servicesDetail": {
				"testservice": {
					"ip": "127.0.0.1",
					"port": 5000
				},
				"relayer": {
					"ip": "127.0.0.1",
					"port": 12000
				}
			}
		}
	}*/
	var re ruleengine.RuleEngine
	var headerPatterns []string
	altChannelMap  := make(map[string]*tchannel.SubChannel)
	headerPatterns, re = initializeDynamicChannel(channel, deps, headerPatterns, altChannelMap, re)
	timeoutVal := int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.timeout"))
	timeout := time.Millisecond * time.Duration(
		timeoutVal,
	)
	timeoutPerAttempt := time.Millisecond * time.Duration(
		deps.Default.Config.MustGetInt("clients.{{$clientID}}.timeoutPerAttempt"),
	)

	methodNames := map[string]string{
		{{range $svc := .Services -}}
		{{range .Methods -}}
		{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
		{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
			{{if $methodName -}}
			"{{$serviceMethod}}": "{{$methodName}}",
			{{end -}}
		{{ end -}}
		{{ end -}}
	}

	//get mapping of client method and it's timeout
	//if mapping is not provided, use client's timeout for all the methods
	clientMethodTimeoutMapping := make(map[string]int64)
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.methodTimeoutMapping") {
		deps.Default.Config.MustGetStruct("clients.{{$clientID}}.methodTimeoutMapping", &clientMethodTimeoutMapping)
	} else {
		for _, methodName := range methodNames {
			clientMethodTimeoutMapping[methodName] = int64(timeoutVal)
		}
	}

	qpsLevels := map[string]string{
				{{range $methodName, $qpsLevel := $QPSLevels -}}
				"{{$methodName}}": "{{$qpsLevel}}",
				{{end}}
	}

	// circuitBreakerDisabled sets whether circuit-breaker should be disabled
	circuitBreakerDisabled := false
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.circuitBreakerDisabled") {
		circuitBreakerDisabled = deps.Default.Config.MustGetBoolean("clients.{{$clientID}}.circuitBreakerDisabled")
	}

	if !circuitBreakerDisabled {
		for methodName, methodTimeoutVal := range clientMethodTimeoutMapping{
			circuitBreakerName := "{{$clientID}}" + "-" + methodName
			qpsLevel := "default"
			if level, ok := qpsLevels[circuitBreakerName]; ok {
				qpsLevel = level
			}
			configureCircuitBreaker(deps, int(methodTimeoutVal), circuitBreakerName, qpsLevel)
		}
	}

	var client *zanzibar.TChannelClient

	if  deps.Default.Config.ContainsKey("tchannelclients.retryCount.feature.enabled") && deps.Default.Config.MustGetBoolean("tchannelclients.retryCount.feature.enabled") && deps.Default.Config.ContainsKey("clients.{{$clientID}}.retryCount") && int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.retryCount")) > 0{
		maxAttempts := int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.retryCount"))
		client = zanzibar.NewTChannelClientContext(
				channel,
				deps.Default.ContextLogger,
				deps.Default.ContextMetrics,
				deps.Default.ContextExtractor,
				&zanzibar.TChannelClientOption{
					ServiceName:          serviceName,
					ClientID:             "{{$clientID}}",
					MethodNames:          methodNames,
					Timeout:              timeout,
					TimeoutPerAttempt:    timeoutPerAttempt,
					RoutingKey:           &routingKey,
					RuleEngine:           re,
					HeaderPatterns:       headerPatterns,
					RequestUUIDHeaderKey: requestUUIDHeaderKey,
					AltChannelMap:        altChannelMap,
					MaxAttempts:          maxAttempts,
				},
			)
	}else{
		client = zanzibar.NewTChannelClientContext(
				channel,
				deps.Default.ContextLogger,
				deps.Default.ContextMetrics,
				deps.Default.ContextExtractor,
				&zanzibar.TChannelClientOption{
					ServiceName:          serviceName,
					ClientID:             "{{$clientID}}",
					MethodNames:          methodNames,
					Timeout:              timeout,
					TimeoutPerAttempt:    timeoutPerAttempt,
					RoutingKey:           &routingKey,
					RuleEngine:           re,
					HeaderPatterns:       headerPatterns,
					RequestUUIDHeaderKey: requestUUIDHeaderKey,
					AltChannelMap:        altChannelMap,
				},
			)
	}

	return &{{$clientName}}{
		client: client,
		circuitBreakerDisabled: circuitBreakerDisabled,
		defaultDeps:            deps.Default,
	}
}

func initializeDynamicChannel(channel *tchannel.Channel, deps *module.Dependencies, headerPatterns []string, altChannelMap map[string]*tchannel.SubChannel, re ruleengine.RuleEngine) ([]string, ruleengine.RuleEngine) {
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.alternates") {
		var alternateServiceDetail config.AlternateServiceDetail
		deps.Default.Config.MustGetStruct("clients.{{$clientID}}.alternates", &alternateServiceDetail)

		ruleWrapper := ruleengine.RuleWrapper{}
		for _, routingConfig := range alternateServiceDetail.RoutingConfigs {
			ruleValue := []string{routingConfig.ServiceName}
			rd := routingConfig.RoutingDelegate
			if rd != nil {
				ruleValue = append(ruleValue, *rd)
			}
			rawRule := ruleengine.RawRule{Patterns: []string{textproto.CanonicalMIMEHeaderKey(routingConfig.HeaderName),
				strings.ToLower(routingConfig.HeaderValue)}, Value: ruleValue}
			headerPatterns = append(headerPatterns, textproto.CanonicalMIMEHeaderKey(routingConfig.HeaderName))
			ruleWrapper.Rules = append(ruleWrapper.Rules, rawRule)

			scAlt := channel.GetSubChannel(routingConfig.ServiceName, tchannel.Isolated)
			serviceRouting, ok := alternateServiceDetail.ServicesDetailMap[routingConfig.ServiceName]
			if !ok {
				panic("service routing mapping incorrect for service: " + routingConfig.ServiceName)
			}
			scAlt.Peers().Add(serviceRouting.IP + ":" + strconv.Itoa(serviceRouting.Port))
			altChannelMap[routingConfig.ServiceName] = scAlt
		}

		re = ruleengine.NewRuleEngine(ruleWrapper)
	}
	return headerPatterns, re
}

// CircuitBreakerConfig is used for storing the circuit breaker parameters for each qps level
type CircuitBreakerConfig struct {
	Parameters map[string]map[string]int
}

func configureCircuitBreaker(deps *module.Dependencies, timeoutVal int, circuitBreakerName string, qpsLevel string) {
	// sleepWindowInMilliseconds sets the amount of time, after tripping the circuit,
	// to reject requests before allowing attempts again to determine if the circuit should again be closed
	sleepWindowInMilliseconds := 5000
	// maxConcurrentRequests sets how many requests can be run at the same time, beyond which requests are rejected
	maxConcurrentRequests := 20
	// errorPercentThreshold sets the error percentage at or above which the circuit should trip open
	errorPercentThreshold := 20
	// requestVolumeThreshold sets a minimum number of requests that will trip the circuit in a rolling window of 10s
	// For example, if the value is 20, then if only 19 requests are received in the rolling window of 10 seconds
	// the circuit will not trip open even if all 19 failed.
	requestVolumeThreshold := 20
	// parses circuit breaker configurations
	if deps.Default.Config.ContainsKey(CircuitBreakerConfigKey) {
		var config CircuitBreakerConfig
		deps.Default.Config.MustGetStruct(CircuitBreakerConfigKey, &config)
		parameters := config.Parameters
		// first checks if level exists in configurations then assigns parameters
		// if "default" qps level assigns default parameters from circuit breaker configurations
		if settings, ok := parameters[qpsLevel]; ok {
			if sleep, ok := settings["sleepWindowInMilliseconds"]; ok {
				sleepWindowInMilliseconds = sleep
			}
			if max, ok := settings["maxConcurrentRequests"]; ok {
				maxConcurrentRequests = max
			}
			if errorPercent, ok := settings["errorPercentThreshold"]; ok {
				errorPercentThreshold = errorPercent
			}
			if reqVolThreshold, ok := settings["requestVolumeThreshold"]; ok {
				requestVolumeThreshold = reqVolThreshold
			}
		}
	}
	// client settings override parameters
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.sleepWindowInMilliseconds") {
		sleepWindowInMilliseconds = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.sleepWindowInMilliseconds"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.maxConcurrentRequests") {
		maxConcurrentRequests = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.maxConcurrentRequests"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.errorPercentThreshold") {
		errorPercentThreshold = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.errorPercentThreshold"))
	}
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.requestVolumeThreshold") {
		requestVolumeThreshold = int(deps.Default.Config.MustGetInt("clients.{{$clientID}}.requestVolumeThreshold"))
	}
	hystrix.ConfigureCommand(circuitBreakerName, hystrix.CommandConfig{
			MaxConcurrentRequests:  maxConcurrentRequests,
			ErrorPercentThreshold:  errorPercentThreshold,
			SleepWindow:            sleepWindowInMilliseconds,
			RequestVolumeThreshold: requestVolumeThreshold,
			Timeout:                timeoutVal,
		})
}

// {{$clientName}} is the TChannel client for downstream service.
type {{$clientName}} struct {
	client *zanzibar.TChannelClient
	circuitBreakerDisabled bool
	defaultDeps  *zanzibar.DefaultDependencies
}

{{range $svc := .Services}}
{{range .Methods}}
{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
{{$methodName := (title (index $exposedMethods $serviceMethod)) -}}
{{if $methodName -}}
	// {{$methodName}} is a client RPC call for method "{{$serviceMethod}}"
	func (c *{{$clientName}}) {{$methodName}}(
		ctx context.Context,
		reqHeaders map[string]string,
		{{if ne .RequestType "" -}}
		args {{.RequestType}},
		{{end -}}
	) (context.Context, {{- if ne .ResponseType "" -}} {{.ResponseType}}, {{- end -}}map[string]string, error) {
		var result {{.GenCodePkgName}}.{{title $svc.Name}}_{{title .Name}}_Result
		{{if .ResponseType -}}
		var resp {{.ResponseType}}
		{{end}}
		logger := c.client.ContextLogger

		{{if eq .RequestType "" -}}
			args := &{{.GenCodePkgName}}.{{title $svc.Name}}_{{title .Name}}_Args{}
		{{end -}}

		var success bool
		respHeaders := make(map[string]string)
		var err error
		if (c.circuitBreakerDisabled) {
			success, respHeaders, err = c.client.Call(
				ctx, "{{$svc.Name}}", "{{.Name}}", reqHeaders, args, &result)
		} else {
			// We want hystrix ckt-breaker to count errors only for system issues
			var clientErr error
			scope := c.defaultDeps.Scope.Tagged(map[string]string{
			"client" : "{{$clientID}}",
			"methodName" : "{{$methodName}}",
			})
			start := time.Now()
			circuitBreakerName := "{{$clientID}}" + "-" + "{{$methodName}}"
			err = hystrix.DoC(ctx, circuitBreakerName, func(ctx context.Context) error {
				elapsed := time.Now().Sub(start)
				scope.Timer("hystrix-timer").Record(elapsed)
				success, respHeaders, clientErr = c.client.Call(
				ctx, "{{$svc.Name}}", "{{.Name}}", reqHeaders, args, &result)
				if _, isSysErr := clientErr.(tchannel.SystemError); !isSysErr {
					// Declare ok if it is not a system-error
					return nil
				}
				return clientErr
			}, nil)
			if err == nil {
				// ckt-breaker was ok, bubble up client error if set
				err = clientErr
			}
		}
		if err != nil {
			zanzibar.AppendLogFieldsToContext(ctx, zap.String("error", fmt.Sprintf("error making tchannel call: %s", err)), logFieldErrLocation)
		}

		if err == nil && !success {
			switch {
				{{range .Exceptions -}}
				case result.{{title .Name}} != nil:
					err = result.{{title .Name}}
					zanzibar.AppendLogFieldsToContext(ctx, zap.Error(err), zanzibar.LogFieldErrTypeClientException, logFieldErrLocation)
				{{end -}}
				{{if ne .ResponseType "" -}}
				case result.Success != nil:
					ctx = logger.WarnZ(ctx, "Internal error. Success flag is not set for {{title .Name}}. Overriding")
					success = true
				{{end -}}
				default:
					err = errors.New("{{$clientName}} received no result or unknown exception for {{title .Name}}")
					zanzibar.AppendLogFieldsToContext(ctx, zap.Error(err), logFieldErrLocation)
			}
		}
		if err != nil {
			ctx = logger.WarnZ(ctx, "Client failure: TChannel client call returned error")
		{{if eq .ResponseType "" -}}
			return ctx, respHeaders, err
		{{else -}}
			return ctx, resp, respHeaders, err
		{{end -}}
		}

		{{if eq .ResponseType "" -}}
			return ctx, respHeaders, err
		{{else -}}
			resp, err = {{.GenCodePkgName}}.{{title $svc.Name}}_{{title .Name}}_Helper.UnwrapResponse(&result)
			if err != nil {
				zanzibar.AppendLogFieldsToContext(ctx, zap.Error(err), logFieldErrLocation)
				ctx = logger.WarnZ(ctx, "Client failure: unable to unwrap client response")
			}
			return ctx, resp, respHeaders, err
		{{end -}}
	}
{{end -}}
{{end -}}
{{end}}
`)

func tchannel_clientTmplBytes() ([]byte, error) {
	return _tchannel_clientTmpl, nil
}

func tchannel_clientTmpl() (*asset, error) {
	bytes, err := tchannel_clientTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "tchannel_client.tmpl", size: 16209, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _tchannel_client_test_serverTmpl = []byte(`{{- /* template to render edge gateway tchannel server code */ -}}
{{- $instance := .Instance }}
package {{$instance.PackageInfo.PackageName}}

import (
	"context"
	"errors"
	"time"

	zanzibar "github.com/uber/zanzibar/runtime"
	"go.uber.org/thriftrw/wire"

	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
)

{{$exposedMethods := .ExposedMethods -}}
{{range $svc := .Services}}
{{range .Methods}}
{{$serviceMethod := printf "%s::%s" $svc.Name .Name -}}
{{$methodName := index $exposedMethods $serviceMethod -}}
{{if $methodName -}}
{{$privateName := lower .Name -}}
{{$genCodePkg := .GenCodePkgName -}}
{{$func := printf "%s%sFunc" $svc.Name (lintAcronym .Name) -}}
{{$handler := printf "%s%sHandler" $svc.Name (lintAcronym .Name) -}}
// {{$func}} is the handler function for "{{.Name}}" method of thrift service "{{$svc.Name}}".
type {{$func}} func (
	ctx context.Context,
	reqHeaders map[string]string,
	{{if ne .RequestType "" -}}
		args {{.RequestType}},
	{{end -}}
) ({{- if ne .ResponseType "" -}}{{.ResponseType}}, {{- end -}}map[string]string, error)

// New{{$handler}} wraps a handler function so it can be registered with a thrift server.
func New{{$handler}}(f {{$func}}) zanzibar.TChannelHandler {
	return &{{$handler}}{f}
}

// {{$handler}} handles the "{{.Name}}" method call of thrift service "{{$svc.Name}}".
type {{$handler}} struct {
	{{$privateName}} {{$func}}
}

// Handle parses request from wire value and calls corresponding handler function.
func (h *{{$handler}}) Handle(
	ctx context.Context,
	reqHeaders map[string]string,
	wireValue *wire.Value,
) (context.Context, bool, zanzibar.RWTStruct, map[string]string, error) {
	var req {{$genCodePkg}}.{{title $svc.Name}}_{{title .Name}}_Args
	var res {{$genCodePkg}}.{{title $svc.Name}}_{{title .Name}}_Result

	if err := req.FromWire(*wireValue); err != nil {
		return ctx, false, nil, nil, err
	}

	{{- if and (eq .RequestType "") (eq .ResponseType "")}}
		respHeaders, err := h.{{$privateName}}(ctx, reqHeaders)
	{{- else if eq .RequestType ""}}
		r, respHeaders, err := h.{{$privateName}}(ctx, reqHeaders)
	{{- else if eq .ResponseType ""}}
		respHeaders, err := h.{{$privateName}}(ctx, reqHeaders, &req)
	{{- else}}
		r, respHeaders, err := h.{{$privateName}}(ctx, reqHeaders, &req)
	{{- end}}

	{{if eq (len .Exceptions) 0 -}}
		if err != nil {
			return ctx, false, nil, nil, err
		}
		{{if .ResponseType -}}
		res.Success = {{.RefResponse "r"}}
		{{end -}}
	{{else -}}
		if err != nil {
			switch v := err.(type) {
			{{$method := .Name -}}
			{{range .Exceptions -}}
				case *{{.Type}}:
					if v == nil {
						return ctx, false, nil, nil, errors.New(
							"Handler for {{$method}} returned non-nil error type *{{title .Name}} but nil value",
						)
					}
					res.{{title .Name}} = v
			{{end -}}
				default:
					return ctx, false, nil, nil, err
			}
		} {{if .ResponseType -}} else {
			res.Success = {{.RefResponse "r"}}
		} {{end -}}
	{{end}}

	return ctx, err == nil, &res, respHeaders, nil
}
{{end -}}
{{end -}}
{{end}}
`)

func tchannel_client_test_serverTmplBytes() ([]byte, error) {
	return _tchannel_client_test_serverTmpl, nil
}

func tchannel_client_test_serverTmpl() (*asset, error) {
	bytes, err := tchannel_client_test_serverTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "tchannel_client_test_server.tmpl", size: 3065, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _tchannel_endpointTmpl = []byte(`{{- /* template to render edge gateway tchannel server code */ -}}
{{- $instance := .Instance }}
{{- $spec := .Spec }}
package {{$instance.PackageInfo.PackageName}}

{{- $middlewares := .Spec.Middlewares }}
import (
	"context"
	"runtime/debug"
	"time"

	"github.com/pkg/errors"
	"go.uber.org/thriftrw/wire"
	"go.uber.org/zap"

	tchannel "github.com/uber/tchannel-go"
	zanzibar "github.com/uber/zanzibar/runtime"

	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end -}}

	{{- if len $middlewares | ne 0 }}
	{{- range $idx, $middleware := $middlewares }}
	{{$middleware.Name | camel}} "{{$middleware.ImportPath}}"
	{{- end}}
	{{- end}}

	module "{{$instance.PackageInfo.ModulePackagePath}}"
)

{{- $serviceMethod := printf "%s%s" (title .Method.ThriftService) (title .Method.Name) }}
{{- $methodName := .Method.Name }}
{{- $handlerName := printf "%sHandler"  $serviceMethod }}
{{- $genCodePkg := .Method.GenCodePkgName }}
{{- $workflowPkg := .WorkflowPkg }}
{{- $workflowInterface := printf "%sWorkflow" $serviceMethod }}
{{- $deputyReqHeader := .DeputyReqHeader}}
{{- $clientID := .ClientID }}

{{with .Method -}}
// New{{$handlerName}} creates a handler to be registered with a thrift server.
func New{{$handlerName}}(deps *module.Dependencies) *{{$handlerName}} {
	handler := &{{$handlerName}}{
		Deps: deps,
	}
	handler.endpoint = zanzibar.NewTChannelEndpoint(
		"{{$spec.EndpointID}}", "{{$spec.HandleID}}", "{{.ThriftService}}::{{.Name}}",
		{{ if len $middlewares | ne 0 -}}
			zanzibar.NewTchannelStack([]zanzibar.MiddlewareTchannelHandle{
			{{range $idx, $middleware := $middlewares -}}
				deps.Middleware.{{$middleware.Name | pascal}}.NewMiddlewareHandle(
					{{$middleware.Name | camel}}.Options{
					{{range $key, $value := $middleware.PrettyOptions -}}
						{{$key}} : {{$value}},
					{{end -}}
					},
				),
			{{end -}}
			}, handler),
		{{- else -}}
			handler,
		{{- end}}
	)

	return handler
}

// {{$handlerName}} is the handler for "{{.ThriftService}}::{{.Name}}".
type {{$handlerName}} struct {
	Deps     *module.Dependencies
	endpoint *zanzibar.TChannelEndpoint
}

// Register adds the tchannel handler to the gateway's tchannel router
func (h *{{$handlerName}}) Register(g *zanzibar.Gateway) error {
	return g.ServerTChannelRouter.Register(h.endpoint)
}

// Handle handles RPC call of "{{.ThriftService}}::{{.Name}}".
func (h *{{$handlerName}}) Handle(
	ctx context.Context,
	reqHeaders map[string]string,
	wireValue *wire.Value,
) (ctxRes context.Context, isSuccessful bool, response zanzibar.RWTStruct, headers map[string]string, e error) {
	defer func() {
		if r := recover(); r != nil {
			stacktrace := string(debug.Stack())
			e = errors.Errorf("enpoint panic: %v, stacktrace: %v", r, stacktrace)
			ctx = h.Deps.Default.ContextLogger.ErrorZ(
				ctx,
				"Endpoint failure: endpoint panic",
				zap.Error(e),
				zap.String("stacktrace", stacktrace))

			h.Deps.Default.ContextMetrics.IncCounter(ctx, zanzibar.MetricEndpointPanics, 1)
			isSuccessful = false
			response = nil
			headers = nil
		}
	}()

	wfReqHeaders := zanzibar.ServerTChannelHeader(reqHeaders)
	{{if .ReqHeaders -}}
	if err := wfReqHeaders.EnsureContext(ctx, {{.ReqHeaders | printf "%#v" }}, h.Deps.Default.ContextLogger); err != nil {
		return ctx, false, nil, nil, errors.Wrapf(
			err, "%s.%s (%s) missing request headers",
			h.endpoint.EndpointID, h.endpoint.HandlerID, h.endpoint.Method,
		)
	}
	{{- end}}

	var res {{$genCodePkg}}.{{title .ThriftService}}_{{title .Name}}_Result

	{{if ne .RequestType "" -}}
	var req {{unref .RequestType}}
	if err := req.FromWire(*wireValue); err != nil {
		ctx = h.Deps.Default.ContextLogger.ErrorZ(ctx, "Endpoint failure: error converting request from wire", zap.Error(err))
		return ctx, false, nil, nil, errors.Wrapf(
			err, "Error converting %s.%s (%s) request from wire",
			h.endpoint.EndpointID, h.endpoint.HandlerID, h.endpoint.Method,
		)
	}


	if hostPort, ok := reqHeaders["{{$deputyReqHeader}}"]; ok {
		if hostPort != "" {
			return h.redirectToDeputy(ctx, reqHeaders, hostPort, &req, &res)
		}
	}
	{{end -}}

	workflow := {{if $workflowPkg}}{{$workflowPkg}}.{{end}}New{{$workflowInterface}}(h.Deps)

	{{if and (eq .RequestType "") (eq .ResponseType "")}}
	ctx, wfResHeaders, err := workflow.Handle(ctx, wfReqHeaders)
	{{else if eq .RequestType ""}}
	ctx, r, wfResHeaders, err := workflow.Handle(ctx, wfReqHeaders)
	{{else if eq .ResponseType ""}}
	ctx, wfResHeaders, err := workflow.Handle(ctx, wfReqHeaders, &req)
	{{else}}
	ctx, r, wfResHeaders, err := workflow.Handle(ctx, wfReqHeaders, &req)
	{{end}}

	resHeaders := map[string]string{}
	if wfResHeaders != nil {
		for _, key := range wfResHeaders.Keys() {
			resHeaders[key], _ = wfResHeaders.Get(key)
		}
	}

	{{if eq (len .Exceptions) 0 -}}
		if err != nil {
			ctx = h.Deps.Default.ContextLogger.ErrorZ(ctx, "Endpoint failure: handler returned error", zap.Error(err))
			return ctx, false, nil, resHeaders, err
		}
		res.Success = {{.RefResponse "r"}}
	{{else -}}
		if err != nil {
			switch v := err.(type) {
			{{$method := .Name -}}
			{{range .Exceptions -}}
				case *{{.Type}}:
					ctxWithError := zanzibar.WithScopeTagsDefault(ctx, map[string]string{
						"app-error": "{{.Type}}",
					}, h.Deps.Default.ContextMetrics.Scope())
					h.Deps.Default.ContextMetrics.IncCounter(ctxWithError, zanzibar.MetricEndpointAppErrors, 1)
					if v == nil {
						ctx = h.Deps.Default.ContextLogger.ErrorZ(
							ctx,
							"Endpoint failure: handler returned non-nil error type *{{.Type}} but nil value",
							zap.Error(err),
						)
						return ctx, false, nil, resHeaders, errors.Errorf(
							"%s.%s (%s) handler returned non-nil error type *{{.Type}} but nil value",
							h.endpoint.EndpointID, h.endpoint.HandlerID, h.endpoint.Method,
						)
					}
					res.{{title .Name}} = v
			{{end -}}
				default:
					ctxWithError := zanzibar.WithScopeTagsDefault(ctx, map[string]string{
						"app-error": "unknown",
					}, h.Deps.Default.ContextMetrics.Scope())
					h.Deps.Default.ContextMetrics.IncCounter(ctxWithError, zanzibar.MetricEndpointAppErrors, 1)
					ctx = h.Deps.Default.ContextLogger.ErrorZ(ctx, "Endpoint failure: handler returned error", zap.Error(err))
					return ctx, false, nil, resHeaders, errors.Wrapf(
						err, "%s.%s (%s) handler returned error",
						h.endpoint.EndpointID, h.endpoint.HandlerID, h.endpoint.Method,
					)
			}
		} {{if ne .ResponseType "" -}} else {
			res.Success = {{.RefResponse "r"}}
		} {{end -}}
	{{end}}

	{{- if .ResHeaders}}
	if wfResHeaders == nil {
		return ctx, false, nil, nil, errors.Wrapf(
			errors.Errorf(
				"Missing mandatory headers: %s",
				strings.Join({{.ResHeaders | printf "%#v" }}, ", "),
			),
			"%s.%s (%s) missing response headers",
			h.endpoint.EndpointID, h.endpoint.HandlerID, h.endpoint.Method,
		)
	}

	if err := wfResHeaders.EnsureContext(ctx, {{.ResHeaders | printf "%#v" }}, h.Deps.Default.ContextLogger); err != nil {
		return ctx, false, nil, nil, errors.Wrapf(
			err, "%s.%s (%s) missing response headers",
			h.endpoint.EndpointID, h.endpoint.HandlerID, h.endpoint.Method,
		)
	}
	{{- end}}

	return ctx, err == nil, &res, resHeaders, nil
}

{{if ne .RequestType "" -}}
// redirectToDeputy sends the request to deputy hostPort
func (h *{{$handlerName}}) redirectToDeputy(
	ctx context.Context,
	reqHeaders map[string]string,
	hostPort string,
	req *{{unref .RequestType}},
	res *{{$genCodePkg}}.{{title .ThriftService}}_{{title .Name}}_Result,
) (context.Context, bool, zanzibar.RWTStruct, map[string]string, error) {
	var routingKey string
	if h.Deps.Default.Config.ContainsKey("tchannel.routingKey") {
		routingKey = h.Deps.Default.Config.MustGetString("tchannel.routingKey")
	}

	serviceName := h.Deps.Default.Config.MustGetString("tchannel.serviceName")
	timeout := time.Millisecond * time.Duration(
		h.Deps.Default.Config.MustGetInt("tchannel.deputy.timeout"),
	)
	timeoutPerAttemptConf := int(h.Deps.Default.Config.MustGetInt("tchannel.deputy.timeoutPerAttempt"))
	timeoutPerAttempt := time.Millisecond * time.Duration(timeoutPerAttemptConf)

	maxAttempts := int(h.Deps.Default.Config.MustGetInt("clients.{{$clientID}}.retryCount"))

	methodNames := map[string]string{
		"{{.ThriftService}}::{{.Name}}": "{{$methodName}}",
	}

	deputyChannel, err := tchannel.NewChannel(serviceName, nil)
	if err != nil {
		ctx = h.Deps.Default.ContextLogger.ErrorZ(ctx, "Deputy Failure", zap.Error(err))
	}
	defer deputyChannel.Close()
	deputyChannel.Peers().Add(hostPort)
	client := zanzibar.NewTChannelClientContext(
		deputyChannel,
		h.Deps.Default.ContextLogger,
		h.Deps.Default.ContextMetrics,
		h.Deps.Default.ContextExtractor,
		&zanzibar.TChannelClientOption{
			ServiceName:       serviceName,
			ClientID:           "{{$clientID}}",
			MethodNames:       methodNames,
			Timeout:           timeout,
			TimeoutPerAttempt: timeoutPerAttempt,
			RoutingKey:        &routingKey,
		},
	)

	timeoutAndRetryConfig := zanzibar.BuildTimeoutAndRetryConfig(timeoutPerAttemptConf, zanzibar.DefaultBackOffTimeAcrossRetriesConf,
																maxAttempts, zanzibar.DefaultScaleFactor)

	ctx = zanzibar.WithTimeAndRetryOptions(ctx, timeoutAndRetryConfig)

	success, respHeaders, err := client.Call(ctx, "{{.ThriftService}}", "{{$methodName}}", reqHeaders, req, res)
	return ctx, success, res, respHeaders, err
}
{{end -}}

{{end -}}
`)

func tchannel_endpointTmplBytes() ([]byte, error) {
	return _tchannel_endpointTmpl, nil
}

func tchannel_endpointTmpl() (*asset, error) {
	bytes, err := tchannel_endpointTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "tchannel_endpoint.tmpl", size: 9383, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _workflowTmpl = []byte(`{{/* template to render gateway workflow interface code */ -}}
{{- $instance := .Instance }}
package workflow

{{- $endpointType := .Spec.EndpointType }}
{{- $reqHeaderMap := .ReqHeaders }}
{{- $reqHeaderMapKeys := .ReqHeadersKeys }}
{{- $defaultHeaders := .DefaultHeaders }}
{{- $reqHeaderRequiredKeys := .ReqRequiredHeadersKeys }}
{{- $resHeaderMap := .ResHeaders }}
{{- $resHeaderMapKeys := .ResHeadersKeys }}
{{- $clientID := .ClientID }}
{{- $clientName := title .ClientName }}
{{- $clientType := .ClientType }}
{{- $clientMethodName := title .ClientMethodName }}
{{- $serviceMethod := printf "%s%s" (title .Method.ThriftService) (title .Method.Name) }}
{{- $workflowInterface := printf "%sWorkflow" $serviceMethod }}
{{- $workflowStruct := camel $workflowInterface }}
{{- $endpointId := .Spec.EndpointID }}
{{- $handleId := .Spec.HandleID }}
{{- $handleIdDotEndpointIdFmt := printf "%s.%s" ($endpointId) ($handleId) }}

import (
	"context"
	"net/textproto"
	"github.com/uber/zanzibar/config"

	zanzibar "github.com/uber/zanzibar/runtime"

	{{range $idx, $pkg := .IncludedPackages -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end -}}

	{{if .Method.Downstream }}
	{{- range $idx, $pkg := .Method.Downstream.IncludedPackages -}}
	{{$file := basePath $pkg.PackageName -}}
	{{$pkg.AliasName}} "{{$pkg.PackageName}}"
	{{end}}
	{{- end}}

	module "{{$instance.PackageInfo.ModulePackagePath}}"
	"go.uber.org/zap"
)

{{with .Method -}}
// {{$workflowInterface}} defines the interface for {{$serviceMethod}} workflow
type {{$workflowInterface}} interface {
Handle(
{{- if and (eq .RequestType "") (eq .ResponseType "") }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
) (context.Context, zanzibar.Header, error)
{{else if eq .RequestType "" }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
) (context.Context, {{.ResponseType}}, zanzibar.Header, error)
{{else if eq .ResponseType "" }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
	r {{.RequestType}},
) (context.Context, zanzibar.Header, error)
{{else}}
	ctx context.Context,
	reqHeaders zanzibar.Header,
	r {{.RequestType}},
) (context.Context, {{.ResponseType}}, zanzibar.Header, error)
{{- end}}
}

{{end -}}

{{- if .Method.Downstream }}
{{- $method := .Method -}}
{{- with .Method -}}
{{- $methodName := title .Name }}
{{- $clientPackage := .Downstream.PackageName -}}
{{- $clientMethod := .DownstreamMethod -}}
{{- $clientReqType := fullTypeName ($clientMethod).RequestType ($clientPackage) -}}
{{- $clientResType := fullTypeName  ($clientMethod).ResponseType ($clientPackage) -}}
{{- $clientExceptions := .DownstreamMethod.Exceptions -}}

// New{{$workflowInterface}} creates a workflow
func New{{$workflowInterface}}(deps *module.Dependencies) {{$workflowInterface}} {
	var whitelistedDynamicHeaders []string
	if deps.Default.Config.ContainsKey("clients.{{$clientID}}.alternates") {
		var alternateServiceDetail config.AlternateServiceDetail
		deps.Default.Config.MustGetStruct("clients.{{$clientID}}.alternates", &alternateServiceDetail)
		for _, routingConfig := range alternateServiceDetail.RoutingConfigs {
			whitelistedDynamicHeaders = append( whitelistedDynamicHeaders, textproto.CanonicalMIMEHeaderKey(routingConfig.HeaderName))
		}
	}

	return &{{$workflowStruct}}{
		Clients: deps.Client,
		Logger:  deps.Default.Logger,
		whitelistedDynamicHeaders: whitelistedDynamicHeaders,
		defaultDeps: deps.Default,
	}
}

// {{$workflowStruct}} calls thrift client {{$clientName}}.{{$clientMethodName}}
type {{$workflowStruct}} struct {
	Clients *module.ClientDependencies
	Logger  *zap.Logger
	whitelistedDynamicHeaders []string
	defaultDeps               *zanzibar.DefaultDependencies
}

// Handle calls thrift client.
func (w {{$workflowStruct}}) Handle(
{{- if and (eq .RequestType "") (eq .ResponseType "") }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
) (context.Context, zanzibar.Header, error) {
{{else if eq .RequestType "" }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
) (context.Context, {{.ResponseType}}, zanzibar.Header, error) {
{{else if eq .ResponseType "" }}
	ctx context.Context,
	reqHeaders zanzibar.Header,
	r {{.RequestType}},
) (context.Context, zanzibar.Header, error) {
{{else}}
	ctx context.Context,
	reqHeaders zanzibar.Header,
	r {{.RequestType}},
) (context.Context, {{.ResponseType}}, zanzibar.Header, error) {
{{- end}}
	{{- if ne .RequestType "" -}}
	clientRequest := convertTo{{title .Name}}ClientRequest(r)
	{{end}}

	{{- if len $method.PropagateHeadersGoStatements | ne 0 }}
		{{- if ne .RequestType "" -}}
			clientRequest = propagateHeaders{{title .Name}}ClientRequests(clientRequest, reqHeaders)
		{{- else -}}
			clientRequest := propagateHeaders{{title .Name}}ClientRequests(nil, reqHeaders)
		{{end}}
	{{end}}

	clientHeaders := map[string]string{}
	{{if (ne (len $defaultHeaders) 0) }}
	var ok bool
	var h string
	var k string
	{{range $i, $k := $defaultHeaders}}
	k = textproto.CanonicalMIMEHeaderKey("{{$k}}")
	h, ok = reqHeaders.Get(k)
	if ok {
		clientHeaders[k] = h
	}
	{{- end -}}
	{{- end -}}

	{{if (ne (len $reqHeaderMapKeys) 0) }}
	{{if (eq (len $defaultHeaders) 0) }}
	var ok bool
	var h string
	{{- end -}}
	{{- end -}}
	{{range $i, $k := $reqHeaderMapKeys}}
	h, ok = reqHeaders.Get("{{$k}}")
	if ok {
		{{- $typedHeader := index $reqHeaderMap $k -}}
		clientHeaders["{{$typedHeader.TransformTo}}"] = h
	}
	{{- end}}
	for _, whitelistedHeader := range w.whitelistedDynamicHeaders {
		headerVal, ok := reqHeaders.Get(whitelistedHeader)
		if ok {
			clientHeaders[whitelistedHeader] = headerVal
		}
	}

	//when maxRetry is 0, timeout per client level is used & one attempt is made, and timoutPerAttempt is not used
	var timeoutAndRetryConfig *zanzibar.TimeoutAndRetryOptions

	//when endpoint level timeout information is available, override it with client level config
	if w.defaultDeps.Config.ContainsKey("endpoints.{{$handleIdDotEndpointIdFmt}}.timeoutPerAttempt") {
		scaleFactor := w.defaultDeps.Config.MustGetFloat("endpoints.{{$handleIdDotEndpointIdFmt}}.scaleFactor")
		maxRetry := int(w.defaultDeps.Config.MustGetInt("endpoints.{{$handleIdDotEndpointIdFmt}}.retryCount"))

		backOffTimeAcrossRetriesCfg := int(w.defaultDeps.Config.MustGetInt("endpoints.{{$handleIdDotEndpointIdFmt}}.backOffTimeAcrossRetries"))
		timeoutPerAttemptConf := int(w.defaultDeps.Config.MustGetInt("endpoints.{{$handleIdDotEndpointIdFmt}}.timeoutPerAttempt"))

		timeoutAndRetryConfig = zanzibar.BuildTimeoutAndRetryConfig(int(timeoutPerAttemptConf), backOffTimeAcrossRetriesCfg, maxRetry, scaleFactor)
		ctx = zanzibar.WithTimeAndRetryOptions(ctx, timeoutAndRetryConfig)
	}

	{{if and (eq $clientReqType "") (eq $clientResType "")}}
		{{if (eq (len $resHeaderMap) 0) -}}
		ctx, _, err := w.Clients.{{$clientName}}.{{$clientMethodName}}(ctx, clientHeaders)
		{{else}}
		ctx, cliRespHeaders, err := w.Clients.{{$clientName}}.{{$clientMethodName}}(ctx, clientHeaders)
		{{- end }}
	{{else if eq $clientReqType ""}}
		{{if (eq (len $resHeaderMap) 0) -}}
		ctx, clientRespBody, cliRespHeaders, err := w.Clients.{{$clientName}}.{{$clientMethodName}}(
			ctx, clientHeaders,
		)
		{{else}}
		ctx, clientRespBody, cliRespHeaders, err := w.Clients.{{$clientName}}.{{$clientMethodName}}(
			ctx, clientHeaders,
		)
		{{- end }}
	{{else if eq $clientResType ""}}
		{{if (eq (len $resHeaderMap) 0) -}}
		ctx, _, err := w.Clients.{{$clientName}}.{{$clientMethodName}}(
			ctx, clientHeaders, clientRequest,
		)
		{{else}}
		ctx, cliRespHeaders, err := w.Clients.{{$clientName}}.{{$clientMethodName}}(
			ctx, clientHeaders, clientRequest,
		)
		{{- end }}
	{{else}}
		{{if (eq (len $resHeaderMap) 0) -}}
		ctx, clientRespBody, cliRespHeaders, err := w.Clients.{{$clientName}}.{{$clientMethodName}}(
			ctx, clientHeaders, clientRequest,
		)
		{{else}}
		ctx, clientRespBody, cliRespHeaders, err := w.Clients.{{$clientName}}.{{$clientMethodName}}(
			ctx, clientHeaders, clientRequest,
		)
		{{- end }}
	{{end -}}

	{{- $responseType := .ResponseType }}
	if err != nil {
		switch errValue := err.(type) {
			{{range $idx, $cException := $clientExceptions}}
			case *{{$cException.Type}}:
				serverErr := convert{{$methodName}}{{title $cException.Name}}(
					errValue,
				)
				{{if eq $responseType ""}}
				return ctx, nil, serverErr
				{{else if eq $responseType "string" }}
				return ctx, "", nil, serverErr
				{{else}}
				return ctx, nil, nil, serverErr
				{{end}}
			{{end}}
			default:
				w.Logger.Warn("Client failure: could not make client request",
					zap.Error(errValue),
					zap.String("client", "{{$clientName}}"),
				)

				{{if eq $responseType ""}}
				return ctx, nil, err
				{{else if eq $responseType "string" }}
				return ctx, "", nil, err
				{{else}}
				return ctx, nil, nil, err
				{{end}}
		}
	}

	// Filter and map response headers from client to server response.
	{{if eq $endpointType "tchannel" -}}
	resHeaders := zanzibar.ServerTChannelHeader{}
	{{- else -}}
	resHeaders := zanzibar.ServerHTTPHeader{}
	{{- end -}}
	{{range $i, $k := $resHeaderMapKeys}}
	{{- $resHeaderVal := index $resHeaderMap $k}}
	if cliRespHeaders != nil {
		resHeaders.Set("{{$resHeaderVal.TransformTo}}", cliRespHeaders["{{$k}}"])
	}
	{{- end}}

	{{if eq .ResponseType "" -}}
	return ctx, resHeaders, nil
	{{- else -}}
	response := convert{{.DownstreamService}}{{title .Name}}ClientResponse(clientRespBody)
	if val, ok := cliRespHeaders[zanzibar.ClientResponseDurationKey]; ok {
		resHeaders.Set(zanzibar.ClientResponseDurationKey, val)
	}

	resHeaders.Set(zanzibar.ClientTypeKey, "{{$clientType}}")
	return ctx, response, resHeaders, nil
	{{- end -}}
}

{{if and (ne .RequestType "") (ne $clientReqType "") -}}
{{ range $key, $line := $method.ConvertRequestGoStatements -}}
{{$line}}
{{ end }}
{{end -}}

{{- $exceptionIndex := .ExceptionsIndex }}
{{range $idx, $cException := $clientExceptions}}
{{- $sException := index $exceptionIndex $cException.Name -}}

func convert{{$methodName}}{{title $cException.Name}}(
	clientError *{{$cException.Type}},
) *{{$sException.Type}} {
	// TODO: Add error fields mapping here.
	serverError := &{{$sException.Type}}{}
	return serverError
}
{{end}}

{{if and (ne .ResponseType "") (ne $clientResType "") -}}
{{ range $key, $line := $method.ConvertResponseGoStatements -}}
{{$line}}
{{ end }}

{{end -}}

{{- if len $method.PropagateHeadersGoStatements | ne 0 }}
{{ range $key, $line := $method.PropagateHeadersGoStatements -}}
{{$line}}
{{ end }}
{{end -}}

{{end -}}
{{end -}}
`)

func workflowTmplBytes() ([]byte, error) {
	return _workflowTmpl, nil
}

func workflowTmpl() (*asset, error) {
	bytes, err := workflowTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "workflow.tmpl", size: 10454, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _workflow_mockTmpl = []byte(`{{$instance := .Instance -}}
{{$espec := .EndpointSpec -}}
{{$clientsWithFixture := .ClientsWithFixture -}}
{{$serviceMethod := printf "%s%s" (title $espec.ThriftServiceName) (title $espec.ThriftMethodName) -}}
{{$workflowInterface := printf "%sWorkflow" $serviceMethod -}}
{{$leafWithFixture := .ClientsWithFixture -}}
{{$leafClass := firstIsClientOrEmpty $instance.DependencyOrder -}}
{{$mockType := printf "Mock%sNodes" (title $leafClass) -}}
{{$classPkg := "module" -}}

package mock{{lower (camel $instance.InstanceName)}}workflow

import (
	"testing"

	"github.com/golang/mock/gomock"
	"github.com/uber-go/tally"
	"go.uber.org/zap"
	zanzibar "github.com/uber/zanzibar/runtime"

	{{range $classType, $moduleInstances := $instance.RecursiveDependencies -}}
	{{range $idx, $moduleInstance := $moduleInstances -}}
	{{if eq $classType $leafClass -}}
	{{$moduleInstance.PackageInfo.GeneratedPackageAlias}}mock "{{$moduleInstance.PackageInfo.GeneratedPackagePath}}/mock-client"
	{{if (index $leafWithFixture $moduleInstance.InstanceName) -}}
	fixture{{$moduleInstance.PackageInfo.ImportPackageAlias}} "{{index $leafWithFixture $moduleInstance.InstanceName}}"
	{{end -}}
	{{else -}}
	{{$moduleInstance.PackageInfo.ImportPackageAlias}} "{{$moduleInstance.PackageInfo.ImportPackagePath}}"
	{{$moduleInstance.PackageInfo.ModulePackageAlias}} "{{$moduleInstance.PackageInfo.ModulePackagePath}}"
	{{end -}}
	{{end -}}
	{{end -}}
	{{$instance.PackageInfo.PackageAlias}} "{{$espec.WorkflowImportPath}}"
	module "{{$instance.PackageInfo.ModulePackagePath}}"
	workflow "{{$instance.PackageInfo.GeneratedPackagePath}}/workflow"
)

// New{{$workflowInterface}}Mock creates a workflow with mock clients
func New{{$workflowInterface}}Mock(t *testing.T) (workflow.{{$workflowInterface}}, *{{$mockType}}) {
	{{ if (len $instance.DependencyOrder) -}}
	ctrl := gomock.NewController(t)
	{{ else -}}
	{{camel $mockType}} := &{{$mockType}}{}
	{{ end }}

	initializedDefaultDependencies := &zanzibar.DefaultDependencies {
		Logger: zap.NewNop(),
		Scope: tally.NewTestScope("", make(map[string]string)),
	}
	initializedDefaultDependencies.ContextLogger = zanzibar.NewContextLogger(initializedDefaultDependencies.Logger)
	initializedDefaultDependencies.ContextExtractor = &zanzibar.ContextExtractors{}

	{{range $idx, $className := $instance.DependencyOrder}}
	{{- $moduleInstances := (index $instance.RecursiveDependencies $className)}}
	{{- $initializedDeps := printf "initialized%sDependencies" (title $className) }}
	{{$initializedDeps}} := &{{$className}}DependenciesNodes{}
	{{if eq $className $leafClass -}}
	{{camel $mockType}} := &{{$mockType}}{
		{{- range $idx, $dependency := $moduleInstances}}
		{{- $pkgInfo := $dependency.PackageInfo }}
		{{- if (index $leafWithFixture $dependency.InstanceName) }}
		{{$pkgInfo.QualifiedInstanceName}}: {{$pkgInfo.GeneratedPackageAlias}}mock.New(ctrl, fixture{{$pkgInfo.ImportPackageAlias}}.Fixture),
		{{- else }}
		{{$pkgInfo.QualifiedInstanceName}}: {{$pkgInfo.GeneratedPackageAlias}}mock.NewMock{{title $className}}(ctrl),
		{{- end }}
		{{- end }}
	}
	{{- range $idx, $dependency := $moduleInstances}}
	{{- $pkgInfo := $dependency.PackageInfo }}
	{{$initializedDeps}}.{{$pkgInfo.QualifiedInstanceName}} = {{camel $mockType}}.{{$pkgInfo.QualifiedInstanceName}}
	{{- end }}
	{{else -}}
	{{- range $idx, $dependency := $moduleInstances}}
	{{- $pkgInfo := $dependency.PackageInfo }}
	{{$initializedDeps}}.{{$pkgInfo.QualifiedInstanceName}} = {{$pkgInfo.ImportPackageAlias}}.{{$pkgInfo.ExportName}}(&{{$pkgInfo.ModulePackageAlias}}.Dependencies{
	Default: initializedDefaultDependencies,
	{{- range $className, $moduleInstances := $dependency.ResolvedDependencies}}
	{{$className | pascal}}: &{{$pkgInfo.ModulePackageAlias}}.{{$className | pascal}}Dependencies{
		{{- range $idy, $subDependency := $moduleInstances}}
		{{$subDependency.PackageInfo.QualifiedInstanceName}}: initialized{{$className | pascal}}Dependencies.{{$subDependency.PackageInfo.QualifiedInstanceName}},
		{{- end}}
	},
	{{- end}}
})
{{- end}}
	{{end}}
	{{end}}

	w := {{$instance.PackageInfo.PackageAlias}}.New{{$workflowInterface}}(
		&{{$classPkg}}.Dependencies{
			Default: initializedDefaultDependencies,
			{{- range $className, $moduleInstances := $instance.ResolvedDependencies}}
			{{$className | pascal}}: &{{$classPkg}}.{{$className | pascal}}Dependencies{
				{{- range $idy, $subDependency := $moduleInstances}}
				{{$subDependency.PackageInfo.QualifiedInstanceName}}: initialized{{$className | pascal}}Dependencies.{{$subDependency.PackageInfo.QualifiedInstanceName}},
				{{- end}}
			},
			{{- end}}
		},
	)

	return w, {{camel $mockType}}
}`)

func workflow_mockTmplBytes() ([]byte, error) {
	return _workflow_mockTmpl, nil
}

func workflow_mockTmpl() (*asset, error) {
	bytes, err := workflow_mockTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "workflow_mock.tmpl", size: 4653, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

var _workflow_mock_clients_typeTmpl = []byte(`{{$instance := .Instance -}}
{{$leafWithFixture := .ClientsWithFixture -}}
{{$leafClass := firstIsClientOrEmpty $instance.DependencyOrder -}}
{{$typeName := printf "Mock%sNodes" (title $leafClass) -}}
{{$mockDeps := index $instance.RecursiveDependencies $leafClass -}}
package mock{{lower (camel $instance.InstanceName)}}workflow

import (
	{{range $classType, $moduleInstances := $instance.RecursiveDependencies -}}
	{{range $idx, $moduleInstance := $moduleInstances -}}
	{{if eq $classType $leafClass -}}
	{{$moduleInstance.PackageInfo.ImportPackageAlias}} "{{$moduleInstance.PackageInfo.ImportPackagePath}}"
	{{$moduleInstance.PackageInfo.GeneratedPackageAlias}}mock "{{$moduleInstance.PackageInfo.GeneratedPackagePath}}/mock-{{$leafClass}}"
	{{else -}}
	{{$moduleInstance.PackageInfo.ImportPackageAlias}} "{{$moduleInstance.PackageInfo.ImportPackagePath}}"
	{{end -}}
	{{end -}}
	{{end -}}
)

// {{$typeName}} contains mock {{$leafClass}} dependencies for the {{$instance.InstanceName}} {{$instance.ClassName}} module
type {{$typeName}} struct {
	{{range $idx, $moduleInstance := $mockDeps -}}
	{{- $pkgInfo := $moduleInstance.PackageInfo }}
	{{- if (index $leafWithFixture $moduleInstance.InstanceName) }}
	{{$pkgInfo.QualifiedInstanceName}} *{{$pkgInfo.GeneratedPackageAlias}}mock.Mock{{$pkgInfo.ExportType}}WithFixture
	{{- else }}
	{{$pkgInfo.QualifiedInstanceName}} *{{$pkgInfo.GeneratedPackageAlias}}mock.Mock{{$pkgInfo.ExportType}}
	{{- end }}
	{{- end }}
}

{{range $idx, $className := $instance.DependencyOrder -}}
{{$moduleInstances := (index $instance.RecursiveDependencies $className) -}}
// {{$className}}DependenciesNodes contains {{$className}} dependencies
type {{$className}}DependenciesNodes struct {
	{{ range $idx, $dependency := $moduleInstances -}}
	{{$dependency.PackageInfo.QualifiedInstanceName}} {{$dependency.PackageInfo.ImportPackageAlias}}.{{$dependency.PackageInfo.ExportType}}
	{{end -}}
}
{{end -}}
`)

func workflow_mock_clients_typeTmplBytes() ([]byte, error) {
	return _workflow_mock_clients_typeTmpl, nil
}

func workflow_mock_clients_typeTmpl() (*asset, error) {
	bytes, err := workflow_mock_clients_typeTmplBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "workflow_mock_clients_type.tmpl", size: 1935, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
	a := &asset{bytes: bytes, info: info}
	return a, nil
}

// Asset loads and returns the asset for the given name.
// It returns an error if the asset could not be found or
// could not be loaded.
func Asset(name string) ([]byte, error) {
	cannonicalName := strings.Replace(name, "\\", "/", -1)
	if f, ok := _bindata[cannonicalName]; ok {
		a, err := f()
		if err != nil {
			return nil, fmt.Errorf("Asset %s can't read by error: %v", name, err)
		}
		return a.bytes, nil
	}
	return nil, fmt.Errorf("Asset %s not found", name)
}

// MustAsset is like Asset but panics when Asset would return an error.
// It simplifies safe initialization of global variables.
func MustAsset(name string) []byte {
	a, err := Asset(name)
	if err != nil {
		panic("asset: Asset(" + name + "): " + err.Error())
	}

	return a
}

// AssetInfo loads and returns the asset info for the given name.
// It returns an error if the asset could not be found or
// could not be loaded.
func AssetInfo(name string) (os.FileInfo, error) {
	cannonicalName := strings.Replace(name, "\\", "/", -1)
	if f, ok := _bindata[cannonicalName]; ok {
		a, err := f()
		if err != nil {
			return nil, fmt.Errorf("AssetInfo %s can't read by error: %v", name, err)
		}
		return a.info, nil
	}
	return nil, fmt.Errorf("AssetInfo %s not found", name)
}

// AssetNames returns the names of the assets.
func AssetNames() []string {
	names := make([]string, 0, len(_bindata))
	for name := range _bindata {
		names = append(names, name)
	}
	return names
}

// _bindata is a table, holding each asset generator, mapped to its name.
var _bindata = map[string]func() (*asset, error){
	"augmented_mock.tmpl":                augmented_mockTmpl,
	"clientless-workflow.tmpl":           clientlessWorkflowTmpl,
	"dependency_struct.tmpl":             dependency_structTmpl,
	"endpoint.tmpl":                      endpointTmpl,
	"endpoint_collection.tmpl":           endpoint_collectionTmpl,
	"endpoint_test.tmpl":                 endpoint_testTmpl,
	"endpoint_test_tchannel_client.tmpl": endpoint_test_tchannel_clientTmpl,
	"fixture_types.tmpl":                 fixture_typesTmpl,
	"grpc_client.tmpl":                   grpc_clientTmpl,
	"http_client.tmpl":                   http_clientTmpl,
	"http_client_test.tmpl":              http_client_testTmpl,
	"main.tmpl":                          mainTmpl,
	"main_test.tmpl":                     main_testTmpl,
	"middleware_http.tmpl":               middleware_httpTmpl,
	"middleware_tchannel.tmpl":           middleware_tchannelTmpl,
	"module_class_initializer.tmpl":      module_class_initializerTmpl,
	"module_initializer.tmpl":            module_initializerTmpl,
	"module_mock_initializer.tmpl":       module_mock_initializerTmpl,
	"service.tmpl":                       serviceTmpl,
	"service_mock.tmpl":                  service_mockTmpl,
	"structs.tmpl":                       structsTmpl,
	"tchannel_client.tmpl":               tchannel_clientTmpl,
	"tchannel_client_test_server.tmpl":   tchannel_client_test_serverTmpl,
	"tchannel_endpoint.tmpl":             tchannel_endpointTmpl,
	"workflow.tmpl":                      workflowTmpl,
	"workflow_mock.tmpl":                 workflow_mockTmpl,
	"workflow_mock_clients_type.tmpl":    workflow_mock_clients_typeTmpl,
}

// AssetDir returns the file names below a certain
// directory embedded in the file by go-bindata.
// For example if you run go-bindata on data/... and data contains the
// following hierarchy:
//
//	data/
//	  foo.txt
//	  img/
//	    a.png
//	    b.png
//
// then AssetDir("data") would return []string{"foo.txt", "img"}
// AssetDir("data/img") would return []string{"a.png", "b.png"}
// AssetDir("foo.txt") and AssetDir("notexist") would return an error
// AssetDir("") will return []string{"data"}.
func AssetDir(name string) ([]string, error) {
	node := _bintree
	if len(name) != 0 {
		cannonicalName := strings.Replace(name, "\\", "/", -1)
		pathList := strings.Split(cannonicalName, "/")
		for _, p := range pathList {
			node = node.Children[p]
			if node == nil {
				return nil, fmt.Errorf("Asset %s not found", name)
			}
		}
	}
	if node.Func != nil {
		return nil, fmt.Errorf("Asset %s not found", name)
	}
	rv := make([]string, 0, len(node.Children))
	for childName := range node.Children {
		rv = append(rv, childName)
	}
	return rv, nil
}

type bintree struct {
	Func     func() (*asset, error)
	Children map[string]*bintree
}

var _bintree = &bintree{nil, map[string]*bintree{
	"augmented_mock.tmpl":                &bintree{augmented_mockTmpl, map[string]*bintree{}},
	"clientless-workflow.tmpl":           &bintree{clientlessWorkflowTmpl, map[string]*bintree{}},
	"dependency_struct.tmpl":             &bintree{dependency_structTmpl, map[string]*bintree{}},
	"endpoint.tmpl":                      &bintree{endpointTmpl, map[string]*bintree{}},
	"endpoint_collection.tmpl":           &bintree{endpoint_collectionTmpl, map[string]*bintree{}},
	"endpoint_test.tmpl":                 &bintree{endpoint_testTmpl, map[string]*bintree{}},
	"endpoint_test_tchannel_client.tmpl": &bintree{endpoint_test_tchannel_clientTmpl, map[string]*bintree{}},
	"fixture_types.tmpl":                 &bintree{fixture_typesTmpl, map[string]*bintree{}},
	"grpc_client.tmpl":                   &bintree{grpc_clientTmpl, map[string]*bintree{}},
	"http_client.tmpl":                   &bintree{http_clientTmpl, map[string]*bintree{}},
	"http_client_test.tmpl":              &bintree{http_client_testTmpl, map[string]*bintree{}},
	"main.tmpl":                          &bintree{mainTmpl, map[string]*bintree{}},
	"main_test.tmpl":                     &bintree{main_testTmpl, map[string]*bintree{}},
	"middleware_http.tmpl":               &bintree{middleware_httpTmpl, map[string]*bintree{}},
	"middleware_tchannel.tmpl":           &bintree{middleware_tchannelTmpl, map[string]*bintree{}},
	"module_class_initializer.tmpl":      &bintree{module_class_initializerTmpl, map[string]*bintree{}},
	"module_initializer.tmpl":            &bintree{module_initializerTmpl, map[string]*bintree{}},
	"module_mock_initializer.tmpl":       &bintree{module_mock_initializerTmpl, map[string]*bintree{}},
	"service.tmpl":                       &bintree{serviceTmpl, map[string]*bintree{}},
	"service_mock.tmpl":                  &bintree{service_mockTmpl, map[string]*bintree{}},
	"structs.tmpl":                       &bintree{structsTmpl, map[string]*bintree{}},
	"tchannel_client.tmpl":               &bintree{tchannel_clientTmpl, map[string]*bintree{}},
	"tchannel_client_test_server.tmpl":   &bintree{tchannel_client_test_serverTmpl, map[string]*bintree{}},
	"tchannel_endpoint.tmpl":             &bintree{tchannel_endpointTmpl, map[string]*bintree{}},
	"workflow.tmpl":                      &bintree{workflowTmpl, map[string]*bintree{}},
	"workflow_mock.tmpl":                 &bintree{workflow_mockTmpl, map[string]*bintree{}},
	"workflow_mock_clients_type.tmpl":    &bintree{workflow_mock_clients_typeTmpl, map[string]*bintree{}},
}}

// RestoreAsset restores an asset under the given directory
func RestoreAsset(dir, name string) error {
	data, err := Asset(name)
	if err != nil {
		return err
	}
	info, err := AssetInfo(name)
	if err != nil {
		return err
	}
	err = os.MkdirAll(_filePath(dir, filepath.Dir(name)), os.FileMode(0755))
	if err != nil {
		return err
	}
	err = ioutil.WriteFile(_filePath(dir, name), data, info.Mode())
	if err != nil {
		return err
	}
	err = os.Chtimes(_filePath(dir, name), info.ModTime(), info.ModTime())
	if err != nil {
		return err
	}
	return nil
}

// RestoreAssets restores an asset under the given directory recursively
func RestoreAssets(dir, name string) error {
	children, err := AssetDir(name)
	// File
	if err != nil {
		return RestoreAsset(dir, name)
	}
	// Dir
	for _, child := range children {
		err = RestoreAssets(dir, filepath.Join(name, child))
		if err != nil {
			return err
		}
	}
	return nil
}

func _filePath(dir, name string) string {
	cannonicalName := strings.Replace(name, "\\", "/", -1)
	return filepath.Join(append([]string{dir}, strings.Split(cannonicalName, "/")...)...)
}