go - 使用 zipkin-go 完成追踪

Question

我有一些服务。我想使用 zipkin-go 跟踪这些服务。在每个服务中，我都会调用一些其他内部服务或数据库调用。我想跟踪每个事件，例如调用内部服务或数据库花费了多少时间。我已经使用互联网上的可用教程来实现。下面是我的代码:

package main

import (
"fmt"
"os"
"net/http"
"log"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"Upload-Image-API/services/controllers/updatemodrefid"
"Upload-Image-API/services/controllers/uploadimage"
"Upload-Image-API/services/utils"
"github.com/openzipkin/zipkin-go"
"github.com/openzipkin/zipkin-go/model"
zipkinhttp "github.com/openzipkin/zipkin-go/middleware/http"
reporterhttp "github.com/openzipkin/zipkin-go/reporter/http"
)

const endpointURL = "http://localhost:9411/api/v2/spans"

func newTracer() (*zipkin.Tracer, error) {
   // The reporter sends traces to zipkin server
   reporter := reporterhttp.NewReporter(endpointURL)
   port := utils.GetString("serviceListeningPort")
   if port == "" {
        fmt.Println("Port is not defined in configuration ...!!!")
        os.Exit(1)
   }
   // Local endpoint represent the local service information
   localEndpoint := &model.Endpoint{ServiceName: "Upload-Image-API", Port: 7795}

   // Sampler tells you which traces are going to be sampled or not. In this case we will record 100% (1.00) of traces.
   sampler, err := zipkin.NewCountingSampler(1)
   if err != nil {
      return nil, err
   }

   t, err := zipkin.NewTracer(
      reporter,
      zipkin.WithSampler(sampler),
      zipkin.WithLocalEndpoint(localEndpoint),
   )
   if err != nil {
      return nil, err
   }

   return t, err
}


func main() {
    var err error
    var environment = os.Args[1]
    err = utils.LoadDefaultConfig(environment)
    tracer, err := newTracer()
    if err != nil {
      log.Fatal(err)
    }
    // We add the instrumented transport to the defaultClient
    // that comes with the zipkin-go library
    http.DefaultClient.Transport, err = zipkinhttp.NewTransport(
        tracer,
        zipkinhttp.TransportTrace(true),
    )
    if err != nil {
      log.Fatal(err)
    }
    if err != nil {
        fmt.Println("Could not load the configuration because of following err " + err.Error() + " ...!!!")
        os.Exit(1)
    } else {
        fmt.Println("Configurations sucessfully loaded for environment " + environment + " ...!!!")
    }
    allowedHeaders := handlers.AllowedHeaders([]string{"X-Requested-With"})
    allowedOrigins := handlers.AllowedOrigins([]string{"*"})
    allowedMethods := handlers.AllowedMethods([]string{"GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS"})

    port := utils.GetString("serviceListeningPort")
    if port == "" {
        fmt.Println("Port is not defined in configuration ...!!!")
        os.Exit(1)
    }
    router := mux.NewRouter().StrictSlash(true)
    router.HandleFunc("/uploadimage", uploadimage.UploadImages).Methods("POST", "GET")
    router.HandleFunc("/updatemodrefid", updatemodrefid.UpdateModRefId).Methods("POST", "GET")
    router.Use(zipkinhttp.NewServerMiddleware(
  tracer,
  zipkinhttp.SpanName("request")), // name for request span
)
    err = http.ListenAndServe(port, handlers.CORS(allowedHeaders, allowedOrigins, allowedMethods)(router))
    if err != nil {
        fmt.Println("Count not start the server because of following err " + err.Error())
        return
    }
}

我正在跟踪我的请求，但无法跟踪 uploadimage Controller 内发生的情况。下面是我的 zipkin UI 的屏幕截图:

我想跟踪 uploadimage Controller 内发生的所有事件。我需要传递什么才能追踪所有内容。

Answer 1

我是 zipkin 和 golang 的新手，如果你想跟踪内部进程，那么你可以从上下文创建 span

示例:假设您有一个名为 Login 的 api，在登录中您可以执行数据库操作或任何其他操作

func Login(res http.ResponseWriter, req *http.Request) {
    span, _ := tracer.StartSpanFromContext(req.Context(), "database")
    databaseOperation()
    span.Finish()
}