Go微服务: go-micro集成链路追踪jaeger_go-micro集成jaeger-优快云博客

关于链路追踪jeager的原理

参考: https://blog.youkuaiyun.com/Tyro_java/article/details/137754812

核心代码演示

1 ) 概述

这里接前文结构框架：https://blog.youkuaiyun.com/Tyro_java/article/details/137753232

2 ）核心代码：common/jaeger.go

package common

import (
	"io"
	"time"

	"github.com/opentracing/opentracing-go"
	"github.com/uber/jaeger-client-go"
	jaegerConfig "github.com/uber/jaeger-client-go/config"
)

// 初始化Jaeger Tracer实例
func NewTracer(serviceName string, addr string) (opentracing.Tracer, io.Closer, error) {
	cfg := jaegerConfig.Configuration{
		ServiceName: serviceName,
		Sampler: &jaegerConfig.SamplerConfig{
			Type:  jaeger.SamplerTypeConst,
			Param: 1, // 采样率设置为1，即100%采样
		},
		Reporter: &jaegerConfig.ReporterConfig{
			BufferFlushInterval: 1 * time.Second,
			LogSpans:            true,
			LocalAgentHostPort:  addr,
		},
	}

	return cfg.NewTracer()
}

可见，这里封装了 Jaeger Tracer 的实例

2 ）核心代码 main.go

package main

import (
	"fmt"
	"log"
	"strconv"

	"github.com/go-micro/plugins/v4/registry/consul"
	opentracingFn "github.com/go-micro/plugins/v4/wrapper/trace/opentracing"
	"github.com/opentracing/opentracing-go"
	"go-micro.dev/v4"
	"go-micro.dev/v4/registry"

	"gitee.com/go-micro-services/product/common"
	"gitee.com/go-micro-services/product/domain/repository"
	"gitee.com/go-micro-services/product/domain/service"
	"gitee.com/go-micro-services/product/handler"
	pbproduct "gitee.com/go-micro-services/product/proto/product"

	"github.com/jinzhu/gorm"
	_ "github.com/jinzhu/gorm/dialects/mysql"
)

var (
	serviceName     = "go.micro.service.product"
	version         = "latest"
	host            = "127.0.0.1"
	port            = 8090
	address         = host + ":" + strconv.Itoa(port)
	mysqlConfigPath = "/micro/config/mysql"
)

func main() {
	// 1. 指定注册中心
	consulReg := consul.NewRegistry(
		registry.Addrs(address),
	)

	// 2. 从配置中心获取mysql配置并创建处理
	mysqlConfig, consulConfigErr := common.GetConsulMysqlConfig(address, mysqlConfigPath)
	if consulConfigErr != nil {
		log.Fatal(consulConfigErr)
	}
	mysqlUrl := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8&parseTime=True&loc=Local", mysqlConfig.User, mysqlConfig.Pwd, mysqlConfig.Host, mysqlConfig.Port, mysqlConfig.Database)
	db, dbErr := gorm.Open("mysql", mysqlUrl)
	if dbErr != nil {
		log.Fatal(dbErr)
	}
	defer db.Close()
	db.SingularTable(false) // true 则 表就是单数

	rp := repository.NewProductRepository(db)
	// 数据库表初始化，只执行一次, 如果本来就设计好了，则无需下面
	// rp.InitTable()

	// 3. 链路追踪配置
	tracer, closer, tracerErr := common.NewTracer("go.micro.service.product", "localhost:6831")
	if tracerErr != nil {
		log.Fatal(tracerErr)
	}
	defer closer.Close()
	opentracing.SetGlobalTracer(tracer)

	// 4. 创建服务实例
	productDataService := service.NewProductDataService(rp)

	// 5. 创建服务和初始化
	srv := micro.NewService()
	srv.Init(
		micro.Name(serviceName),
		micro.Version(version),
		micro.Registry(consulReg),
		micro.WrapHandler(opentracingFn.NewHandlerWrapper(opentracing.GlobalTracer())), // 绑定链路追踪
	)

	// 6. 注册 handler
	if handlerErr := pbproduct.RegisterProductHandler(srv.Server(), &handler.Product{ProductDataService: productDataService}); handlerErr != nil {
		log.Fatal(handlerErr)
	}

	// 7. 运行服务
	if runErr := srv.Run(); runErr != nil {
		log.Fatal(runErr)
	}
}