echo

A middleware for the echov4 web framework to use OpenTracing

package main

import (
  "github.com/labstack/echo/v4"
  apmecho "github.com/opentracing-contrib/echo"
  "github.com/opentracing-contrib/echo/examples/tracer"
  "github.com/opentracing/opentracing-go"
  "net/http"
  "os"
)

const (
  DefaultComponentName = "echo-demo"
)

func main() {

  flag := os.Getenv("JAEGER_ENABLED")
  if flag == "true" {
    // 1. init tracer
    tracer, closer := tracer.Init(DefaultComponentName)
    if closer != nil {
      defer closer.Close()
    }
    // 2. ste the global tracer
    if tracer != nil {
      opentracing.SetGlobalTracer(tracer)
    }
  }

  e := echo.New()

  if flag == "true" {
    // 3. use the middleware
    e.Use(apmecho.Middleware(DefaultComponentName))
  }

  e.GET("/", func(c echo.Context) error {
    return c.String(http.StatusOK, "Hello, World!")
  })

  e.Logger.Fatal(e.Start(":1323"))
}

Example: echo-example