mirror of https://github.com/grpc/grpc-go.git
68 lines
2.9 KiB
Go
68 lines
2.9 KiB
Go
/*
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* Copyright 2024 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package opentelemetry
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import (
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"context"
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"strings"
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"go.opentelemetry.io/otel/trace"
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"google.golang.org/grpc"
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otelinternaltracing "google.golang.org/grpc/stats/opentelemetry/internal/tracing"
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)
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const (
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delayedResolutionEventName = "Delayed name resolution complete"
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tracerName = "grpc-go"
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)
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// traceTagRPC populates provided context with a new span using the
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// TextMapPropagator supplied in trace options and internal itracing.carrier.
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// It creates a new outgoing carrier which serializes information about this
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// span into gRPC Metadata, if TextMapPropagator is provided in the trace
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// options. if TextMapPropagator is not provided, it returns the context as is.
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func (h *clientStatsHandler) traceTagRPC(ctx context.Context, ai *attemptInfo, nameResolutionDelayed bool) (context.Context, *attemptInfo) {
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// Add a "Delayed name resolution complete" event to the call span
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// if there was name resolution delay. In case of multiple retry attempts,
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// ensure that event is added only once.
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callSpan := trace.SpanFromContext(ctx)
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ci := getCallInfo(ctx)
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if nameResolutionDelayed && !ci.nameResolutionEventAdded.Swap(true) && callSpan.SpanContext().IsValid() {
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callSpan.AddEvent(delayedResolutionEventName)
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}
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mn := "Attempt." + strings.Replace(ai.method, "/", ".", -1)
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tracer := h.options.TraceOptions.TracerProvider.Tracer(tracerName, trace.WithInstrumentationVersion(grpc.Version))
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ctx, span := tracer.Start(ctx, mn)
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carrier := otelinternaltracing.NewOutgoingCarrier(ctx)
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h.options.TraceOptions.TextMapPropagator.Inject(ctx, carrier)
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ai.traceSpan = span
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return carrier.Context(), ai
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}
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// createCallTraceSpan creates a call span to put in the provided context using
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// provided TraceProvider. If TraceProvider is nil, it returns context as is.
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func (h *clientStatsHandler) createCallTraceSpan(ctx context.Context, method string) (context.Context, trace.Span) {
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if h.options.TraceOptions.TracerProvider == nil {
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logger.Error("TraceProvider is not provided in trace options")
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return ctx, nil
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}
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mn := "Sent." + strings.Replace(removeLeadingSlash(method), "/", ".", -1)
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tracer := h.options.TraceOptions.TracerProvider.Tracer(tracerName, trace.WithInstrumentationVersion(grpc.Version))
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ctx, span := tracer.Start(ctx, mn, trace.WithSpanKind(trace.SpanKindClient))
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return ctx, span
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}
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