将跟踪上下文在GO中的传入请求的标题（krakend的自定义插件）

Question

我想在GO中创建一个自定义插件，然后将其加载到Krakend（Text）中。

在此插件中，我想生成一个跟踪跨度上下文（root）并注入每个传入请求的标头，然后传播到另一个后端API。 我有此代码：

import (
    "context"
    "fmt"
    "net/http"

    // jaegerPropagator "go.opentelemetry.io/contrib/propagators/jaeger"
    "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
    "go.opentelemetry.io/otel"
    "go.opentelemetry.io/otel/propagation"
    "go.opentelemetry.io/otel/sdk/trace"
    otelTrace "go.opentelemetry.io/otel/trace"
)

func newTraceProvider() (*trace.TracerProvider, error) {
    traceExporter, err := stdouttrace.New(
        stdouttrace.WithPrettyPrint())
    if err != nil {
        return nil, err
    }

    traceProvider := trace.NewTracerProvider(
        trace.WithBatcher(traceExporter),
    )
    return traceProvider, nil
}

// This method takes an "http.Handler" and returns another "http.Handler" that modifies the incoming request
func (req registrable) registerHandlers(ctx context.Context, extra map[string]interface{}, handler http.Handler) (http.Handler, error) {

    return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
                 otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{},   propagation.Baggage{}))

        // Set up trace provider.
        tracerProvider, err := newTraceProvider()
        fmt.Println(err)

        tracer := tracerProvider.Tracer(nameTracer)

        // Start a new server span using the tracer and the incoming request context
        newCtx, span := tracer.Start(
            ctx,
            "Root-Server-Span",
            otelTrace.WithSpanKind(otelTrace.SpanKindServer),
        )
        defer span.End() // Ensure the span is ended

        carrier := propagation.HeaderCarrier(req.Header)
        otel.GetTextMapPropagator().Inject(newCtx, carrier)


        // Call the next handler in the chain with the new context
        handler.ServeHTTP(w, req.WithContext(newCtx))
    }), nil
}

插件成功加载，但不能注入标题。 有人在那里知道上述并可以帮助我吗？

我忘了将插件的名称放在克拉肯德。

问题解决了！！！

Answer 1