tencent cloud

nohup ./jaeger-agent --reporter.grpc.host-port={{接入点}} --agent.tags=token={{token}}


cfg := &jaegerConfig.Configuration{
    ServiceName: ginClientName, //对其发起请求的的调用链，叫什么服务
    Sampler: &jaegerConfig.SamplerConfig{ //采样策略的配置，详情见4.1.1
    Type:  "const",
    Param: 1,
    },
    Reporter: &jaegerConfig.ReporterConfig{ //配置客户端如何上报trace信息，所有字段都是可选的
    LogSpans:          true,
    LocalAgentHostPort: endPoint,
    },
    //Token配置
    Tags:        []opentracing.Tag{ //设置tag，token等信息可存于此
    opentracing.Tag{Key: "token", Value: token}, //设置token
    },
}

tracer, closer, err := cfg.NewTracer(jaegerConfig.Logger(jaeger.StdLogger)) //根据配置得到tracer


span := tracer.StartSpan("CallDemoServer") //构建span
ctx := opentracing.ContextWithSpan(context.Background(), span) //将span的引用放入conext中


//构建http的请求
req, err := http.NewRequest(
        http.MethodGet,
        fmt.Sprintf("http://localhost%s/ping", ginPort),
        nil,
    )
req = req.WithContext(ctx)
//构建带tracer的请求
req, ht := nethttp.TraceRequest(tracer, req)


httpClient := &http.Client{Transport: &nethttp.Transport{}} //初始化http客户端
res, err := httpClient.Do(req)
//..省略err判断
body, err := ioutil.ReadAll(res.Body)
//..省略err判断
log.Printf(" %s recevice: %s\\n", clientServerName, string(body))


// Copyright © 2019-2020 Tencent Co., Ltd.

// This file is part of tencent project.
// Do not copy, cite, or distribute without the express
// permission from Cloud Monitor group.

package gindemo

import (
    "context"
    "fmt"
    "github.com/opentracing-contrib/go-stdlib/nethttp"
    "github.com/opentracing/opentracing-go"
    "github.com/opentracing/opentracing-go/ext"
    opentracingLog "github.com/opentracing/opentracing-go/log"
    "github.com/uber/jaeger-client-go"
    jaegerConfig "github.com/uber/jaeger-client-go/config"
    "io/ioutil"
    "log"
    "net/http"
)

const (
    // 服务名 服务唯一标示，服务指标聚合过滤依据。
    ginClientName = "demo-gin-client"
    ginPort       = ":8080"
    endPoint      = "xxxxx:6831" // 本地agent地址
    token         = "abc"
)

// StartClient gin client 也是标准的 http client.
func StartClient() {
    cfg := &jaegerConfig.Configuration{
        ServiceName: ginClientName, //对其发起请求的的调用链，叫什么服务
        Sampler: &jaegerConfig.SamplerConfig{ //采样策略的配置，详情见4.1.1
            Type:  "const",
            Param: 1,
        },
        Reporter: &jaegerConfig.ReporterConfig{ //配置客户端如何上报trace信息，所有字段都是可选的
            LogSpans:           true,
            LocalAgentHostPort: endPoint,
        },
        //Token配置
        Tags: []opentracing.Tag{ //设置tag，token等信息可存于此
            opentracing.Tag{Key: "token", Value: token}, //设置token
        },
    }

    tracer, closer, err := cfg.NewTracer(jaegerConfig.Logger(jaeger.StdLogger)) //根据配置得到tracer
    defer closer.Close()
    if err != nil {
        panic(fmt.Sprintf("ERROR: fail init Jaeger: %v\\n", err))
    }
    //构建span，并将span放入context中
    span := tracer.StartSpan("CallDemoServer")
    ctx := opentracing.ContextWithSpan(context.Background(), span)
    defer span.Finish()

    // 构建http请求
    req, err := http.NewRequest(
        http.MethodGet,
        fmt.Sprintf("http://localhost%s/ping", ginPort),
        nil,
    )
    if err != nil {
        HandlerError(span, err)
        return
    }
    // 构建带tracer的请求
    req = req.WithContext(ctx)
    req, ht := nethttp.TraceRequest(tracer, req)
    defer ht.Finish()

    // 初始化http客户端
    httpClient := &http.Client{Transport: &nethttp.Transport{}}
    // 发起请求
    res, err := httpClient.Do(req)
    if err != nil {
        HandlerError(span, err)
        return
    }
    defer res.Body.Close()
    body, err := ioutil.ReadAll(res.Body)
    if err != nil {
        HandlerError(span, err)
        return
    }
    log.Printf(" %s recevice: %s\\n", ginClientName, string(body))
}

// HandlerError handle error to span.
func HandlerError(span opentracing.Span, err error) {
    span.SetTag(string(ext.Error), true)
    span.LogKV(opentracingLog.Error(err))
}