runtime/tchannel_interfaces.go

// Copyright (c) 2023 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package zanzibar

import (
	"context"

	"go.uber.org/thriftrw/wire"
)

// RWTStruct abstracts the request/response structs generated by thriftrw.
type RWTStruct interface {
	ToWire() (wire.Value, error)
	FromWire(wire.Value) error
}

// TChannelCaller abstracts calling a Thrift endpoint, and is used by the generated client code.
type TChannelCaller interface {
	// Call should be passed the method to call, headers and the request/response thriftrw structs.
	// The arguments returned are (whether there was an application error, unexpected error)
	Call(ctx context.Context, service, method string, reqHeaders map[string]string, req, resp RWTStruct) (success bool, respHeaders map[string]string, err error)
}

// TChannelHandler abstracts handling of an RPC that is implemented by the generated server code.
type TChannelHandler interface {
	// Handle should read the request from the given reqReader, and return the response struct.
	// The arguments returned are (whether there was an application error, response headers, result struct, unexpected error)
	Handle(ctx context.Context, reqHeaders map[string]string, wireValue *wire.Value) (ctxRes context.Context, success bool, resp RWTStruct, respHeaders map[string]string, err error)
}