common/jaeger/jaeger.go

package jaeger

import (
	"context"
	"encoding/json"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/net/ghttp"
	"github.com/gogf/gf/v2/util/gconv"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/jaeger"
	"go.opentelemetry.io/otel/sdk/resource"
	"go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
	"strconv"
)

var Tp = new(trace.TracerProvider)

func init() {
	jaegerAgent, err := g.Cfg().Get(context.Background(), "jaeger.addr")
	if err != nil {
		panic(err)
	}
	exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(gconv.String(jaegerAgent))))
	if err != nil {
		panic(err)
	}
	serverName, err := g.Cfg().Get(context.Background(), "server.Name")
	if err != nil {
		panic(err)
	}
	// 创建一个 TracerProvider，并将 Jaeger exporter 设置为其处理器
	Tp = trace.NewTracerProvider(
		// 使用 BatchSpanProcessor 可以提高性能，它会批量发送 span
		trace.WithBatcher(exp),
		// 设置资源属性，这些属性会附加到所有导出的 span 上
		trace.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceName(gconv.String(serverName)), // 服务名称，在 Jaeger UI 中会显示
		)),
	)
	// 将 TracerProvider 设置为全局，方便在应用的任何地方通过 otel.Tracer() 获取
	otel.SetTracerProvider(Tp)
}
func NewTracer(r *ghttp.Request) {
	// 从传入的上下文中获取 Tracer，或者直接使用全局的
	tracer := otel.Tracer(r.GetServeHandler().GetMetaTag("summary"))
	_, span := tracer.Start(r.Context(), r.GetServeHandler().GetMetaTag("summary"))
	defer span.End() // 非常重要：确保 span 在函数结束时被关闭
	span.SetAttributes(attribute.String("request", getParams(r)))
	r.Middleware.Next()
	span.SetAttributes(attribute.String("response", r.Response.BufferString()))
	//span.AddEvent("Saying hello is done")
}
func getParams(r *ghttp.Request) string {
	params := map[string]interface{}{}
	if r.Method == "POST" {
		json.Unmarshal(r.GetBody(), &params) //获取raw传参
	}
	if r.Method == "GET" {
		r.Request.ParseForm()
		form := r.Form
		for k, v := range form {
			if vl, e := strconv.Atoi(v[0]); e == nil {
				params[k] = vl
			} else {
				params[k] = v[0]
			}
		}
	}
	rp, _ := json.Marshal(&params)
	return string(rp)
}