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Added support for Trace name truncation for traces

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This commit is contained in:
Alex Antonov 2018-07-31 17:16:03 -05:00 • committed by Traefiker Bot
parent ed0c7d9c49
commit 4d79c2a6d2
8 changed files with 404 additions and 14 deletions
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19
middlewares/tracing/forwarder.go
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@ -23,7 +23,7 @@ func (t *Tracing) NewForwarderMiddleware(frontend, backend string) negroni.Handl
Tracing: t,
frontend: frontend,
backend: backend,
opName: fmt.Sprintf("forward %s/%s", frontend, backend),
opName: generateForwardSpanName(frontend, backend, t.SpanNameLimit),
}
}
@ -44,3 +44,20 @@ func (f *forwarderMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request,
LogResponseCode(span, recorder.Status())
}
// generateForwardSpanName 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 21 characters
func generateForwardSpanName(frontend, backend string, spanLimit int) string {
name := fmt.Sprintf("forward %s/%s", frontend, backend)
if spanLimit > 0 && len(name) > spanLimit {
if spanLimit < ForwardMaxLengthNumber {
log.Warnf("SpanNameLimit is set to be less than required static number of characters, defaulting to %d + 3", ForwardMaxLengthNumber)
spanLimit = ForwardMaxLengthNumber + 3
}
hash := computeHash(name)
limit := (spanLimit - ForwardMaxLengthNumber) / 2
name = fmt.Sprintf("forward %s/%s/%s", truncateString(frontend, limit), truncateString(backend, limit), hash)
}
return name
}