mirror of https://github.com/grpc/grpc-go.git
47 lines
1.9 KiB
Go
47 lines
1.9 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"
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"go.opentelemetry.io/otel/trace"
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otelinternaltracing "google.golang.org/grpc/stats/opentelemetry/internal/tracing"
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)
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// traceTagRPC populates context with new span data using the TextMapPropagator
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// supplied in trace options and internal itracing.Carrier. It creates a new
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// incoming carrier which extracts an existing span context (if present) by
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// deserializing from provided context. If valid span context is extracted, it
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// is set as parent of the new span otherwise new span remains the root span.
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// If TextMapPropagator is not provided in the trace options, it returns context
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// as is.
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func (h *serverStatsHandler) traceTagRPC(ctx context.Context, ai *attemptInfo) (context.Context, *attemptInfo) {
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mn := strings.Replace(ai.method, "/", ".", -1)
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var span trace.Span
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tracer := otel.Tracer("grpc-open-telemetry")
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ctx = otel.GetTextMapPropagator().Extract(ctx, otelinternaltracing.NewIncomingCarrier(ctx))
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// If the context.Context provided in `ctx` to tracer.Start(), contains a
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// span then the newly-created Span will be a child of that span,
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// otherwise it will be a root span.
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ctx, span = tracer.Start(ctx, mn, trace.WithSpanKind(trace.SpanKindServer))
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ai.traceSpan = span
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return ctx, ai
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}
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