mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-14 10:13:10 +02:00
96 lines
2.7 KiB
Go
96 lines
2.7 KiB
Go
// Copyright The OpenTelemetry 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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package grpctrace
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import (
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"context"
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"google.golang.org/grpc/metadata"
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"go.opentelemetry.io/otel/api/correlation"
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"go.opentelemetry.io/otel/api/global"
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"go.opentelemetry.io/otel/api/kv"
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"go.opentelemetry.io/otel/api/propagation"
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"go.opentelemetry.io/otel/api/trace"
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)
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// Option is a function that allows configuration of the grpctrace Extract()
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// and Inject() functions
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type Option func(*config)
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type config struct {
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propagators propagation.Propagators
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}
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func newConfig(opts []Option) *config {
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c := &config{propagators: global.Propagators()}
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for _, o := range opts {
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o(c)
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}
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return c
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}
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// WithPropagators sets the propagators to use for Extraction and Injection
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func WithPropagators(props propagation.Propagators) Option {
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return func(c *config) {
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c.propagators = props
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}
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}
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type metadataSupplier struct {
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metadata *metadata.MD
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}
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func (s *metadataSupplier) Get(key string) string {
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values := s.metadata.Get(key)
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if len(values) == 0 {
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return ""
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}
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return values[0]
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}
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func (s *metadataSupplier) Set(key string, value string) {
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s.metadata.Set(key, value)
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}
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// Inject injects correlation context and span context into the gRPC
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// metadata object. This function is meant to be used on outgoing
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// requests.
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func Inject(ctx context.Context, metadata *metadata.MD, opts ...Option) {
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c := newConfig(opts)
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propagation.InjectHTTP(ctx, c.propagators, &metadataSupplier{
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metadata: metadata,
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})
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}
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// Extract returns the correlation context and span context that
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// another service encoded in the gRPC metadata object with Inject.
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// This function is meant to be used on incoming requests.
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func Extract(ctx context.Context, metadata *metadata.MD, opts ...Option) ([]kv.KeyValue, trace.SpanContext) {
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c := newConfig(opts)
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ctx = propagation.ExtractHTTP(ctx, c.propagators, &metadataSupplier{
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metadata: metadata,
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})
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spanContext := trace.RemoteSpanContextFromContext(ctx)
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var correlationCtxKVs []kv.KeyValue
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correlation.MapFromContext(ctx).Foreach(func(kv kv.KeyValue) bool {
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correlationCtxKVs = append(correlationCtxKVs, kv)
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return true
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})
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return correlationCtxKVs, spanContext
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}
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