[语言] Tracer：开放遥测、Golang 和 Jagger 简单实现

示踪剂

Tracer 是可观察性的一部分，它在微服务架构的实现中发挥着重要作用，并提供应用程序逻辑中运行的进程的“跟踪”概述。

简单来说，在Webservice中，Tracer会通过发出Trace信号来提供一个逻辑的执行时间有多长的想法。稍后，通过 Exporter 向 Collector 传输信号后，该 Tracer 将以嵌套跨度的形式可视化并可见。 [OpenTelemetry：痕迹]

开放式遥测

为了能够传输随后由收集器收集的 Traces 信号，Webservice 需要 OpenTelemetry 作为一个库，该库已成为标准的可观测性协议，通常称为 OpenTelemetry 协议 (OTLP)。 [OpenTelemetry：语言 - Go]

耶格

跟踪信号的可视化确实需要提供 Web 服务中发生的进程的概述。 Jaeger 是一个开源平台，利用 HTTP 或 gRPC 通信协议支持 OTLP。 [耶格尔]

在 Go 语言中的实现

Golang编程语言中Tracer的实现将实现一个简单的情况，即Web服务仅返回具有不同响应持续时间的数据。将使用的库是：

• Chi：HTTP 框架
• OpenTelemetry：遥测信令

将 OpenTelemetry 设置为遥测模块

在 pkg/telemetry/telemetry.go 目录中实现 Telemetry 模块：

package telemetry

import (
    "context"
    "errors"
    "time"

    "go.opentelemetry.io/otel"
    "go.opentelemetry.io/otel/exporters/otlp/otlptrace"
    "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
    "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
    "go.opentelemetry.io/otel/sdk/resource"
    "go.opentelemetry.io/otel/sdk/trace"
)

// enumeration constant for which protocol used
const (
    HTTP uint8 = iota
    GRPC
)

// setup client to connect web-service with Jaeger
func SetupTraceClient(ctx context.Context, protocol uint8, endpoint string) otlptrace.Client {
    switch protocol {
    case GRPC:
        return otlptracegrpc.NewClient(otlptracegrpc.WithEndpoint(endpoint), otlptracegrpc.WithInsecure(), otlptracegrpc.WithCompressor("gzip"))
    default:
        return otlptracehttp.NewClient(otlptracehttp.WithEndpoint(endpoint), otlptracehttp.WithInsecure(), otlptracehttp.WithCompression(otlptracehttp.NoCompression))
    }
}

func setupTraceProvider(ctx context.Context, traceClient otlptrace.Client) (*trace.TracerProvider, error) {
    // set resource
    res, err := resource.New(
        ctx,
        resource.WithFromEnv(),
    )
    if err != nil {
        return nil, err
    }

    // init trace exporter
    traceExporter, err := otlptrace.New(ctx, traceClient)
    if err != nil {
        return nil, err
    }

    // init trace exporter
    traceProvider := trace.NewTracerProvider(
        trace.WithBatcher(
            traceExporter,
            trace.WithBatchTimeout(time.Duration(time.Second*3)),
        ),
        trace.WithResource(res), // Discover and provide attributes from OTEL_RESOURCE_ATTRIBUTES and OTEL_SERVICE_NAME environment variables.
    )

    return traceProvider, nil
}

func SetupTelemetrySDK(ctx context.Context, traceClient otlptrace.Client) (func(context.Context) error, error) {
    var err error
    var shutdownFuncs []func(context.Context) error

    shutdown := func(ctx context.Context) error {
        var err error
        for _, fn := range shutdownFuncs {
            err = errors.Join(err, fn(ctx))
        }
        shutdownFuncs = nil
        return err
    }

    handleErr := func(inErr error) {
        err = errors.Join(inErr, shutdown(ctx))
    }

    traceProvider, err := setupTraceProvider(ctx, traceClient)
    if err != nil {
        handleErr(err)
        return shutdown, err
    }

    shutdownFuncs = append(shutdownFuncs, traceProvider.Shutdown)
    otel.SetTracerProvider(traceProvider)

    return shutdown, nil
}

然后，在主函数main.go中设置遥测配置：

package main

import (
    "context"
    "fmt"
    "net/http"
    "os"
    "os/signal"
    "syscall"
    "time"

    "github.com/go-chi/chi/v5"
    "github.com/wahyurudiyan/medium/otel-jaeger/config"
    "github.com/wahyurudiyan/medium/otel-jaeger/pkg/telemetry"
    "github.com/wahyurudiyan/medium/otel-jaeger/router"
)

func SetupTelemetry(ctx context.Context, config *config.Config) (func(context.Context) error, error) {
    otlpCli := telemetry.SetupTraceClient(ctx, telemetry.GRPC, config.JaegerGRPCEndpoint)
    shutdownFn, err := telemetry.SetupTelemetrySDK(ctx, otlpCli)
    return shutdownFn, err
}

func main() {
    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    defer cancel()

    cfg := config.Get()

    shutdownFn, err := SetupTelemetry(ctx, cfg)
    if err != nil {
        shutdownFn(ctx)
        panic(err)
    }

    r := chi.NewRouter()
    r.Route("/api", func(r chi.Router) {
        router.Router(r)
    })

    srv := http.Server{
        Addr:    "0.0.0.0:8080",
        Handler: r,
    }
    go func() {
        fmt.Println("Server running at port:", srv.Addr)
        if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
            fmt.Printf("listen: %s\n", err)
        }
    }()

    quit := make(chan os.Signal, 1)
    signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
    



<p>在router/router.go文件的handler中使用Tracer来传输Traces信号：<br>
</p>

<pre class="brush:php;toolbar:false">package router

import (
    "encoding/json"
    "net/http"
    "time"

    "github.com/go-chi/chi/v5"
    "github.com/wahyurudiyan/medium/otel-jaeger/pkg/random"
    "go.opentelemetry.io/otel"
)

var (
    tracer = otel.Tracer("WebServer-Otel-Jaeger")
)

func getUserHandler(w http.ResponseWriter, r *http.Request) {
    _, span := tracer.Start(r.Context(), "GetUser")
    defer span.End()

    user := struct {
        Name     string
        Email    string
        Password string
    }{
        Name:     "John Doe",
        Email:    "john@email.com",
        Password: "Super5ecr3t!",
    }
    blob, _ := json.Marshal(&user)

    sleepDuration := time.Duration(time.Millisecond * time.Duration(random.GenerateRandNum()))
    time.Sleep(sleepDuration)

    w.Header().Add("Content-Type", "application/json")
    w.WriteHeader(http.StatusOK)
    w.Write(blob)
}

func Router(router chi.Router) {
    router.Get("/user", getUserHandler)
}

部署

此构建 Web 服务的 Docker 配置，利用 Dockerfile 中的多阶段构建映像机制：

FROM golang:1.23.4 AS build
WORKDIR /src
COPY . .
RUN go get -v
RUN CGO_ENABLED=0 go build -o /bin/service .

FROM alpine:latest
WORKDIR /app
COPY --from=build /bin/service /bin/service
CMD ["/bin/service"]

接下来，将通过 docker-compose.yaml 文件进行镜像构建，配置如下：

services:
  web-service:
    container_name: service
    build:
      context: .
      dockerfile: Dockerfile
    environment:
      OTEL_SERVICE_NAME: service-otel-jaeger
      JAEGER_GRPC_ENDPOINT: jaeger:4317
    entrypoint: ["service"]
    ports:
      - 8080:8080

  jaeger:
    container_name: jaeger
    image: jaegertracing/all-in-one:latest
    environment:
      COLLECTOR_ZIPKIN_HOST_PORT: :9411
    ports:
      - 16686:16686 
      - 4317:4317 
      - 4318:4318 
      - 9411:9411

在service.jaeger.ports中，暴露的端口是：

• 16686：Jaeger 仪表板
• 4317：采用 gRPC 协议的 Jaeger OTLP Protobuf
• 4318：采用 HTTP 协议的 Jaeger OTLP Protobuf/JSON
• 9411：Zipkin 收藏家

运行docker-compose.yaml中已经定义的应用程序，可以使用命令：

docker compose up --build

应用程序运行后，您可以尝试在端点 http://127.0.0.1:8080/api/user 上点击应用程序，如果 Webservice 和应用程序已连接，则服务名称将出现如图所示。

将出现一个跨度来定义运行一个流程需要多长时间。

负载测试

现在让我们尝试使用 CLI 工具 hey [https://github.com/rakyll/hey] 来运行负载测试。以下命令可用于执行简单的负载测试：

package telemetry

import (
    "context"
    "errors"
    "time"

    "go.opentelemetry.io/otel"
    "go.opentelemetry.io/otel/exporters/otlp/otlptrace"
    "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
    "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
    "go.opentelemetry.io/otel/sdk/resource"
    "go.opentelemetry.io/otel/sdk/trace"
)

// enumeration constant for which protocol used
const (
    HTTP uint8 = iota
    GRPC
)

// setup client to connect web-service with Jaeger
func SetupTraceClient(ctx context.Context, protocol uint8, endpoint string) otlptrace.Client {
    switch protocol {
    case GRPC:
        return otlptracegrpc.NewClient(otlptracegrpc.WithEndpoint(endpoint), otlptracegrpc.WithInsecure(), otlptracegrpc.WithCompressor("gzip"))
    default:
        return otlptracehttp.NewClient(otlptracehttp.WithEndpoint(endpoint), otlptracehttp.WithInsecure(), otlptracehttp.WithCompression(otlptracehttp.NoCompression))
    }
}

func setupTraceProvider(ctx context.Context, traceClient otlptrace.Client) (*trace.TracerProvider, error) {
    // set resource
    res, err := resource.New(
        ctx,
        resource.WithFromEnv(),
    )
    if err != nil {
        return nil, err
    }

    // init trace exporter
    traceExporter, err := otlptrace.New(ctx, traceClient)
    if err != nil {
        return nil, err
    }

    // init trace exporter
    traceProvider := trace.NewTracerProvider(
        trace.WithBatcher(
            traceExporter,
            trace.WithBatchTimeout(time.Duration(time.Second*3)),
        ),
        trace.WithResource(res), // Discover and provide attributes from OTEL_RESOURCE_ATTRIBUTES and OTEL_SERVICE_NAME environment variables.
    )

    return traceProvider, nil
}

func SetupTelemetrySDK(ctx context.Context, traceClient otlptrace.Client) (func(context.Context) error, error) {
    var err error
    var shutdownFuncs []func(context.Context) error

    shutdown := func(ctx context.Context) error {
        var err error
        for _, fn := range shutdownFuncs {
            err = errors.Join(err, fn(ctx))
        }
        shutdownFuncs = nil
        return err
    }

    handleErr := func(inErr error) {
        err = errors.Join(inErr, shutdown(ctx))
    }

    traceProvider, err := setupTraceProvider(ctx, traceClient)
    if err != nil {
        handleErr(err)
        return shutdown, err
    }

    shutdownFuncs = append(shutdownFuncs, traceProvider.Shutdown)
    otel.SetTracerProvider(traceProvider)

    return shutdown, nil
}

该命令将运行每秒 100 个请求 (RPS) 的负载测试，持续 10 分钟。 Jaeger UI 页面上显示的结果如下所示。

如果负载测试运行完成，将会有负载测试结果的报告。

package main

import (
    "context"
    "fmt"
    "net/http"
    "os"
    "os/signal"
    "syscall"
    "time"

    "github.com/go-chi/chi/v5"
    "github.com/wahyurudiyan/medium/otel-jaeger/config"
    "github.com/wahyurudiyan/medium/otel-jaeger/pkg/telemetry"
    "github.com/wahyurudiyan/medium/otel-jaeger/router"
)

func SetupTelemetry(ctx context.Context, config *config.Config) (func(context.Context) error, error) {
    otlpCli := telemetry.SetupTraceClient(ctx, telemetry.GRPC, config.JaegerGRPCEndpoint)
    shutdownFn, err := telemetry.SetupTelemetrySDK(ctx, otlpCli)
    return shutdownFn, err
}

func main() {
    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    defer cancel()

    cfg := config.Get()

    shutdownFn, err := SetupTelemetry(ctx, cfg)
    if err != nil {
        shutdownFn(ctx)
        panic(err)
    }

    r := chi.NewRouter()
    r.Route("/api", func(r chi.Router) {
        router.Router(r)
    })

    srv := http.Server{
        Addr:    "0.0.0.0:8080",
        Handler: r,
    }
    go func() {
        fmt.Println("Server running at port:", srv.Addr)
        if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
            fmt.Printf("listen: %s\n", err)
        }
    }()

    quit := make(chan os.Signal, 1)
    signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
    



<h2>
  
  
  Github项目
</h2>

<p>对于那些想要尝试或查看完整代码的人，您可以克隆以下存储库：https://github.com/wahyurudiyan/otel-jaeger。</p>


          

            
        

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