go使用opentelemetry+jaeger---本地函数

之前做过这个，时间久了就忘记了。这里做个笔记

jaeger自行安装，由于最近docker镜像都失效了，只能去GitHub自己下载二进制，或者你懂得。。

项目目录

local.go

package main

import (
	"context"
	"log"
	"time"

	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/jaeger"
	"go.opentelemetry.io/otel/sdk/resource"
	tracesdk "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
)

const (
	service     = "local" //服务名字
	environment = "dev"   //环境
	id          = 1       //服务id
)

// tracerProvider
func tracerProvider(url string) (*tracesdk.TracerProvider, error) {
	// 创建 Jaeger exporter
	exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(url)))
	if err != nil {
		return nil, err
	}
	tp := tracesdk.NewTracerProvider(
		tracesdk.WithBatcher(exp),
		tracesdk.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceName(service),
			attribute.String("environment", environment),
			attribute.Int64("ID", id),
		)),
	)
	return tp, nil
}

func main() {
	tp, err := tracerProvider("http://192.168.252.128:14268/api/traces")
	if err != nil {
		log.Fatal("连不上jaeger", err)
	}
	// 以jaeger为上报指标地址
	otel.SetTracerProvider(tp)

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	//优雅退出
	defer func(ctx context.Context) {
		ctx, cancel = context.WithTimeout(ctx, time.Second*5)
		defer cancel()
		if err := tp.Shutdown(ctx); err != nil {
			log.Fatal(err)
		}
	}(ctx)
	//创建一个跟踪器
	tr := tp.Tracer("component-main")
	//启动新的span
	ctx, span := tr.Start(ctx, "foo")
	defer span.End()
	//通过ctx进行传参，连接
	bar(ctx)
}

func bar(ctx context.Context) {
	//新的跟踪器
	tr := otel.Tracer("component-bar")
	//新span
	_, span := tr.Start(ctx, "bar")
	//设置属性
	span.SetAttributes(attribute.Key("testset").String("value"))
	defer span.End()
}