58 lines
1.9 KiB
Go
58 lines
1.9 KiB
Go
package tracing
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import (
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"fmt"
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"net/http"
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"github.com/containous/traefik/log"
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"github.com/opentracing/opentracing-go"
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"github.com/opentracing/opentracing-go/ext"
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"github.com/urfave/negroni"
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)
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type entryPointMiddleware struct {
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entryPoint string
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*Tracing
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}
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// NewEntryPoint creates a new middleware that the incoming request
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func (t *Tracing) NewEntryPoint(name string) negroni.Handler {
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log.Debug("Added entrypoint tracing middleware")
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return &entryPointMiddleware{Tracing: t, entryPoint: name}
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}
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func (e *entryPointMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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opNameFunc := generateEntryPointSpanName
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ctx, _ := e.Extract(opentracing.HTTPHeaders, HTTPHeadersCarrier(r.Header))
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span := e.StartSpan(opNameFunc(r, e.entryPoint, e.SpanNameLimit), ext.RPCServerOption(ctx))
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ext.Component.Set(span, e.ServiceName)
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LogRequest(span, r)
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ext.SpanKindRPCServer.Set(span)
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r = r.WithContext(opentracing.ContextWithSpan(r.Context(), span))
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recorder := newStatusCodeRecoder(w, 200)
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next(recorder, r)
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LogResponseCode(span, recorder.Status())
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span.Finish()
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}
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// generateEntryPointSpanName will return a Span name of an appropriate lenth based on the 'spanLimit' argument. If needed, it will be truncated, but will not be less than 24 characters.
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func generateEntryPointSpanName(r *http.Request, entryPoint string, spanLimit int) string {
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name := fmt.Sprintf("Entrypoint %s %s", entryPoint, r.Host)
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if spanLimit > 0 && len(name) > spanLimit {
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if spanLimit < EntryPointMaxLengthNumber {
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log.Warnf("SpanNameLimit is set to be less than required static number of characters, defaulting to %d + 3", EntryPointMaxLengthNumber)
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spanLimit = EntryPointMaxLengthNumber + 3
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}
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hash := computeHash(name)
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limit := (spanLimit - EntryPointMaxLengthNumber) / 2
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name = fmt.Sprintf("Entrypoint %s %s %s", truncateString(entryPoint, limit), truncateString(r.Host, limit), hash)
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}
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return name
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}
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