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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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23
middlewares/tracing/entrypoint.go
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@ -22,12 +22,10 @@ func (t *Tracing) NewEntryPoint(name string) negroni.Handler {
}
func (e *entryPointMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
opNameFunc := func(r *http.Request) string {
return fmt.Sprintf("Entrypoint %s %s", e.entryPoint, r.Host)
}
opNameFunc := generateEntryPointSpanName
ctx, _ := e.Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(r.Header))
span := e.StartSpan(opNameFunc(r), ext.RPCServerOption(ctx))
span := e.StartSpan(opNameFunc(r, e.entryPoint, e.SpanNameLimit), ext.RPCServerOption(ctx))
ext.Component.Set(span, e.ServiceName)
LogRequest(span, r)
ext.SpanKindRPCServer.Set(span)
@ -40,3 +38,20 @@ func (e *entryPointMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request,
LogResponseCode(span, recorder.Status())
span.Finish()
}
// 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.
func generateEntryPointSpanName(r *http.Request, entryPoint string, spanLimit int) string {
name := fmt.Sprintf("Entrypoint %s %s", entryPoint, r.Host)
if spanLimit > 0 && len(name) > spanLimit {
if spanLimit < EntryPointMaxLengthNumber {
log.Warnf("SpanNameLimit is set to be less than required static number of characters, defaulting to %d + 3", EntryPointMaxLengthNumber)
spanLimit = EntryPointMaxLengthNumber + 3
}
hash := computeHash(name)
limit := (spanLimit - EntryPointMaxLengthNumber) / 2
name = fmt.Sprintf("Entrypoint %s %s %s", truncateString(entryPoint, limit), truncateString(r.Host, limit), hash)
}
return name
}