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81
instrumentation/google.golang.org/grpc/otelgrpc/metadata_supplier.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| // Copyright The OpenTelemetry Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| package otelgrpc // import "go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc" | ||
|
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| import ( | ||
| "context" | ||
|
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| "go.opentelemetry.io/otel/baggage" | ||
| "go.opentelemetry.io/otel/propagation" | ||
| "go.opentelemetry.io/otel/trace" | ||
| "google.golang.org/grpc/metadata" | ||
| ) | ||
|
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| type metadataSupplier struct { | ||
| metadata *metadata.MD | ||
| } | ||
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| // assert that metadataSupplier implements the TextMapCarrier interface. | ||
| var _ propagation.TextMapCarrier = &metadataSupplier{} | ||
|
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| func (s *metadataSupplier) Get(key string) string { | ||
| values := s.metadata.Get(key) | ||
| if len(values) == 0 { | ||
| return "" | ||
| } | ||
| return values[0] | ||
| } | ||
|
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| func (s *metadataSupplier) Set(key string, value string) { | ||
| s.metadata.Set(key, value) | ||
| } | ||
|
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| func (s *metadataSupplier) Keys() []string { | ||
| out := make([]string, 0, len(*s.metadata)) | ||
| for key := range *s.metadata { | ||
| out = append(out, key) | ||
| } | ||
| return out | ||
| } | ||
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| // Inject injects correlation context and span context into the gRPC | ||
| // metadata object. This function is meant to be used on outgoing | ||
| // requests. | ||
| func Inject(ctx context.Context, md *metadata.MD, opts ...Option) { | ||
| c := newConfig(opts) | ||
| inject(ctx, md, c.Propagators) | ||
| } | ||
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| func inject(ctx context.Context, md *metadata.MD, propagators propagation.TextMapPropagator) { | ||
| propagators.Inject(ctx, &metadataSupplier{ | ||
| metadata: md, | ||
| }) | ||
| } | ||
|
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| // Extract returns the correlation context and span context that | ||
| // another service encoded in the gRPC metadata object with Inject. | ||
| // This function is meant to be used on incoming requests. | ||
| func Extract(ctx context.Context, md *metadata.MD, opts ...Option) (baggage.Baggage, trace.SpanContext) { | ||
| c := newConfig(opts) | ||
| return extract(ctx, md, c.Propagators) | ||
| } | ||
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| func extract(ctx context.Context, md *metadata.MD, propagators propagation.TextMapPropagator) (baggage.Baggage, trace.SpanContext) { | ||
| ctx = propagators.Extract(ctx, &metadataSupplier{ | ||
| metadata: md, | ||
| }) | ||
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| return baggage.FromContext(ctx), trace.SpanContextFromContext(ctx) | ||
| } |