services/function/main.go

// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"context"
	"fmt"
	"math/rand"
	"net/http"
	"time"

	"github.com/OpenFunction/functions-framework-go/framework"
	"github.com/OpenFunction/functions-framework-go/plugin"
	"github.com/OpenFunction/functions-framework-go/plugin/skywalking"
	"k8s.io/klog/v2"
)

func HelloWorld(w http.ResponseWriter, r *http.Request) {
	time.Sleep(time.Millisecond * time.Duration(rand.Intn(60)))
	fmt.Fprintf(w, "Hello, %s!\n", r.URL.Path[1:])
}

func main() {
	ctx := context.Background()
	fwk, err := framework.NewFramework()
	if err != nil {
		klog.Fatal(err)
	}
	fwk.RegisterPlugins(map[string]plugin.Plugin{
		"skywalking": &skywalking.PluginSkywalking{},
	})

	err = fwk.Register(ctx, HelloWorld)
	if err != nil {
		klog.Fatal(err)
	}

	err = fwk.Start(ctx)
	if err != nil {
		klog.Fatal(err)
	}
}