example_gin_test.go

// Licensed to SkyAPM org under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. SkyAPM org 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 gin

import (
	"fmt"
	"log"
	"net/http"
	"sync"

	"github.com/SkyAPM/go2sky"
	h "github.com/SkyAPM/go2sky/plugins/http"
	"github.com/SkyAPM/go2sky/reporter"
	"github.com/gin-gonic/gin"
)

func ExampleMiddleware() {
	// Use gRPC reporter for production
	re, err := reporter.NewLogReporter()
	if err != nil {
		log.Fatalf("new reporter error %v \n", err)
	}
	defer re.Close()

	tracer, err := go2sky.NewTracer("gin-server", go2sky.WithReporter(re))
	if err != nil {
		log.Fatalf("create tracer error %v \n", err)
	}
	tracer.WaitUntilRegister()
	gin.SetMode(gin.ReleaseMode)
	r := gin.New()

	//Use go2sky middleware with tracing
	r.Use(Middleware(r, tracer))

	r.GET("/user/:name", func(c *gin.Context) {
		name := c.Param("name")
		c.String(200, "Hello %s", name)
	})

	go func() {
		if err := http.ListenAndServe(":8080", r); err != nil {
			panic(err)
		}
	}()
	var wg sync.WaitGroup
	wg.Add(1)
	go func() {
		defer wg.Done()
		request(tracer)
	}()
	wg.Wait()
	// Output:

}

func request(tracer *go2sky.Tracer) {
	//NewClient returns an HTTP Client with tracer
	client, err := h.NewClient(tracer)
	if err != nil {
		log.Fatalf("create client error %v \n", err)
	}
	request, err := http.NewRequest("GET", fmt.Sprintf("%s/user/gin", "http://127.0.0.1:8080"), nil)
	if err != nil {
		log.Fatalf("unable to create http request: %+v\n", err)
	}
	res, err := client.Do(request)
	if err != nil {
		log.Fatalf("unable to do http request: %+v\n", err)
	}
	_ = res.Body.Close()
}