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server: avoid call to trace.FromContext and resulting allocations when tracing is disabled #2926

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merged 1 commit into from
Jul 30, 2019
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server: avoid call to trace.FromContext and resulting allocations when tracing is disabled #2926

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3 changes: 3 additions & 0 deletions server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -759,6 +759,9 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// traceInfo returns a traceInfo and associates it with stream, if tracing is enabled.
// If tracing is not enabled, it returns nil.
func (s *Server) traceInfo(st transport.ServerTransport, stream *transport.Stream) (trInfo *traceInfo) {
if !EnableTracing {
return nil
}
tr, ok := trace.FromContext(stream.Context())
if !ok {
return nil
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