我正在嘗試使用otelgin來跟蹤我的項目，它是這樣說的where required. It is available from gin.Context.Request.Context()，那么我如何從 gin.context 中獲取詳細信息以查看它是否有效。正式地，他們在初始化跟蹤器提供程序時添加一個標準輸出作為導出器：func initTracer() (*sdktrace.TracerProvider, error) { // stdout as exporter exporter, err := stdout.New(stdout.WithPrettyPrint()) if err != nil { return nil, err } tp := sdktrace.NewTracerProvider( sdktrace.WithSampler(sdktrace.AlwaysSample()), sdktrace.WithBatcher(exporter), ) otel.SetTracerProvider(tp) otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})) return tp, nil}這是命令行輸出的一部分："Name": "/users/:id", "SpanContext": { "TraceID": "e7a43d30c0e507b4c59fd65dc3bc6d77", "SpanID": "636c22201c903573", "TraceFlags": "01", "TraceState": "", "Remote": false }, "Parent": { "TraceID": "00000000000000000000000000000000", "SpanID": "0000000000000000", "TraceFlags": "00", "TraceState": "", "Remote": false }, "SpanKind": 2, "StartTime": "2022-11-12T16:02:07.871843+08:00", "EndTime": "2022-11-12T16:02:07.871843+08:00",但是有什么辦法可以得到這個表單 gin.Context 嗎？或者我可以從 gin.Context 獲取出口商的詳細信息嗎？我試圖添加一個中間件來捕獲它們：func TracerGetMiddleware(c *gin.Context) { //var tracer oteltrace.Tracer //tracerInterface, ok := c.Get("otel-go-contrib-tracer") //if ok { /// tracer, ok = tracerInterface.(oteltrace.Tracer) //} //tracer.Start(c, "test") fmt.Println(c.Request.Context())}但這是 c.Request.Context() 的輸出(type *http.contextKey, val <not Stringer>).WithValue(type *http.contextKey, val [::1]:8088).WithCancel.WithCancel.WithValue(type trace.traceContextKeyType, val <not Stringer>)
1 回答
慕虎7371278
TA貢獻1802條經驗 獲得超4個贊
目前我明白了我原本想得到的答案，就是獲取gin.context中的traceID、SpanID等數據
import (
"fmt"
"github.com/gin-gonic/gin"
oteltrace "go.opentelemetry.io/otel/trace"
)
func GetIDMiddleware() gin.HandlerFunc {
return func(c *gin.Context) {
if oteltrace.SpanFromContext(c.Request.Context()).SpanContext().IsValid() {
TraceID := oteltrace.SpanFromContext(c.Request.Context()).SpanContext().TraceID().String()
SpanID := oteltrace.SpanFromContext(c.Request.Context()).SpanContext().SpanID().String()
fmt.Println(TraceID)
fmt.Println(SpanID)
}
}
}
我最初的想法是通過otelgin在context中傳遞trace信息，然后在gin的中間件中通過context抓取traceID等用于zap logging，但是當時不知道怎么獲取TraceID等信息，當我看到gin-contrib/zap庫找到了正確的方法。
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