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golang学习笔记（二）：链路追踪
自定义http连接的服务端
package server import ( "github.com/gin-gonic/gin" "go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin" "net/http" ) type MyServer struct { Server *http.Server } func GetServer() *MyServer { gin.SetMode(gin.ReleaseMode) engine := gin.New() s := &http.Server{ Handler: engine, } return &MyServer{ Server: s, } } func (s *MyServer) GetEngine() *gin.Engine { return s.Server.Handler.(*gin.Engine) } func (s *MyServer) Start(addr string) error { e := s.GetEngine() err2 := e.Run(addr) if err2 != nil { return err2 } err := s.Server.ListenAndServe() if err != nil { return err } return nil } func (s *MyServer) EnableTracing() { s.GetEngine().Use(otelgin.Middleware("go20230923")) }- 1
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初始化链路追踪
package tracing import ( "context" "fmt" "go.opentelemetry.io/contrib/propagators/b3" "go.opentelemetry.io/otel" "go.opentelemetry.io/otel/exporters/jaeger" "go.opentelemetry.io/otel/exporters/stdout/stdouttrace" "go.opentelemetry.io/otel/propagation" "go.opentelemetry.io/otel/sdk/resource" "go.opentelemetry.io/otel/sdk/trace" semconv "go.opentelemetry.io/otel/semconv/v1.4.0" ) var tracer = otel.Tracer("go20230923") func InitStdoutProvider(serviceName string) (func(ctx context.Context) error, error) { tracer = otel.Tracer(serviceName) // stdout as exporter exporter, err := stdouttrace.New(stdouttrace.WithPrettyPrint()) if err != nil { return nil, err } tp := trace.NewTracerProvider( trace.WithSampler(trace.AlwaysSample()), trace.WithBatcher(exporter), ) otel.SetTracerProvider(tp) otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})) return tp.Shutdown, nil }- 1
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注册路由
package router import ( "fmt" "github.com/gin-gonic/gin" "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp" "go.opentelemetry.io/otel/trace" "go20230923/pkg/server" "log" "net/http" ) func InitRouter(s *server.MyServer) { engine := s.GetEngine() group := engine.Group("/v1") group.GET("/hello", Hello) group.GET("/world", World) } func Hello(c *gin.Context) { if trace.SpanFromContext(c.Request.Context()).SpanContext().IsValid() { spanCtx := trace.SpanFromContext(c.Request.Context()).SpanContext() traceId := spanCtx.TraceID() spanId := spanCtx.SpanID() fmt.Printf("traceId : %s\n", traceId) fmt.Printf("spanId : %s\n", spanId) } fmt.Println("hello world") request, err := http.NewRequestWithContext(c.Request.Context(), "GET", "http://localhost:8080/v1/world", nil) if err != nil { log.Fatal(err) } client := http.Client{Transport: otelhttp.NewTransport(http.DefaultTransport)} client.Do(request) } func World(c *gin.Context) { if trace.SpanFromContext(c.Request.Context()).SpanContext().IsValid() { spanCtx := trace.SpanFromContext(c.Request.Context()).SpanContext() traceId := spanCtx.TraceID() spanId := spanCtx.SpanID() fmt.Printf("traceId : %s\n", traceId) fmt.Printf("spanId : %s\n", spanId) } fmt.Println("hello world") }- 1
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启动入口
package main import ( "fmt" "go20230923/pkg/server" "go20230923/pkg/tracing" "go20230923/router" ) func main() { s := server.GetServer() s.EnableTracing() tracing.InitStdoutProvider("go20230923") router.InitRouter(s) err := s.Start(":8080") if err != nil { fmt.Println(err) } }- 1
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GET http://localhost:8080/v1/hello 输出：
traceId : 302c3e67a16bd20ce35b9220a4297d08 spanId : f80dd7189261ed84 hello world traceId : 302c3e67a16bd20ce35b9220a4297d08 spanId : 7826014d750cf1c5 hello world { "Name": "/v1/world", "SpanContext": { "TraceID": "302c3e67a16bd20ce35b9220a4297d08", "SpanID": "7826014d750cf1c5", "TraceFlags": "01", "TraceState": "", "Remote": false }, "Parent": { "TraceID": "302c3e67a16bd20ce35b9220a4297d08", "SpanID": "aaa69798fdc0e90c", "TraceFlags": "01", "TraceState": "", "Remote": true }, "SpanKind": 2, "StartTime": "2023-09-29T11:32:41.5265746+08:00", "EndTime": "2023-09-29T11:32:41.5271363+08:00", "Attributes": [ { "Key": "http.method", "Value": { "Type": "STRING", "Value": "GET" } }, { "Key": "http.scheme", "Value": { "Type": "STRING", "Value": "http" } }, { "Key": "http.flavor", "Value": { "Type": "STRING", "Value": "1.1" } }, { "Key": "net.host.name", "Value": { "Type": "STRING", "Value": "go20230923" } }, { "Key": "net.host.port", "Value": { "Type": "INT64", "Value": 8080 } }, { "Key": "net.sock.peer.addr", "Value": { "Type": "STRING", "Value": "::1" } }, { "Key": "net.sock.peer.port", "Value": { "Type": "INT64", "Value": 62471 } }, { "Key": "http.user_agent", "Value": { "Type": "STRING", "Value": "Go-http-client/1.1" } }, { "Key": "http.route", "Value": { "Type": "STRING", "Value": "/v1/world" } }, { "Key": "http.status_code", "Value": { "Type": "INT64", "Value": 200 } } ], "Events": null, "Links": null, "Status": { "Code": "Unset", "Description": "" }, "DroppedAttributes": 0, "DroppedEvents": 0, "DroppedLinks": 0, "ChildSpanCount": 0, "Resource": [ { "Key": "service.name", "Value": { "Type": "STRING", "Value": "unknown_service:___go_build_go20230923.exe" } }, { "Key": "telemetry.sdk.language", "Value": { "Type": "STRING", "Value": "go" } }, { "Key": "telemetry.sdk.name", "Value": { "Type": "STRING", "Value": "opentelemetry" } }, { "Key": "telemetry.sdk.version", "Value": { "Type": "STRING", "Value": "1.18.0" } } ], "InstrumentationLibrary": { "Name": "go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin", "Version": "0.44.0", "SchemaURL": "" } } { "Name": "/v1/hello", "SpanContext": { "TraceID": "302c3e67a16bd20ce35b9220a4297d08", "SpanID": "f80dd7189261ed84", "TraceFlags": "01", "TraceState": "", "Remote": false }, "Parent": { "TraceID": "00000000000000000000000000000000", "SpanID": "0000000000000000", "TraceFlags": "00", "TraceState": "", "Remote": false }, "SpanKind": 2, "StartTime": "2023-09-29T11:32:41.5252493+08:00", "EndTime": "2023-09-29T11:32:41.5271363+08:00", "Attributes": [ { "Key": "http.method", "Value": { "Type": "STRING", "Value": "GET" } }, { "Key": "http.scheme", "Value": { "Type": "STRING", "Value": "http" } }, { "Key": "http.flavor", "Value": { "Type": "STRING", "Value": "1.1" } }, { "Key": "net.host.name", "Value": { "Type": "STRING", "Value": "go20230923" } }, { "Key": "net.host.port", "Value": { "Type": "INT64", "Value": 8080 } }, { "Key": "net.sock.peer.addr", "Value": { "Type": "STRING", "Value": "::1" } }, { "Key": "net.sock.peer.port", "Value": { "Type": "INT64", "Value": 64585 } }, { "Key": "http.user_agent", "Value": { "Type": "STRING", "Value": "PostmanRuntime/7.28.0" } }, { "Key": "http.route", "Value": { "Type": "STRING", "Value": "/v1/hello" } }, { "Key": "http.status_code", "Value": { "Type": "INT64", "Value": 200 } } ], "Events": null, "Links": null, "Status": { "Code": "Unset", "Description": "" }, "DroppedAttributes": 0, "DroppedEvents": 0, "DroppedLinks": 0, "ChildSpanCount": 1, "Resource": [ { "Key": "service.name", "Value": { "Type": "STRING", "Value": "unknown_service:___go_build_go20230923.exe" } }, { "Key": "telemetry.sdk.language", "Value": { "Type": "STRING", "Value": "go" } }, { "Key": "telemetry.sdk.name", "Value": { "Type": "STRING", "Value": "opentelemetry" } }, { "Key": "telemetry.sdk.version", "Value": { "Type": "STRING", "Value": "1.18.0" } } ], "InstrumentationLibrary": { "Name": "go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin", "Version": "0.44.0", "SchemaURL": "" } }- 1
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参考
Go语言 如何获取有关 *gin.Context.Request.Context()的详细信息
golang 使用 OpenTelemetry 实现跨服务全链路追踪
github go-moda项目 -
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- 原文地址：https://blog.csdn.net/u012734723/article/details/132656149
