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https://github.com/open-telemetry/opentelemetry-go.git
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e11b90cab2
* Implement W3C Correlation Context propagator * PR comments * PR comments * Update test to inject context properly * Fix merge
58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
// Copyright 2019, 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 httptrace
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import (
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"context"
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"net/http"
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"go.opentelemetry.io/api/core"
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"go.opentelemetry.io/api/key"
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"go.opentelemetry.io/propagation"
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)
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const (
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Vendor = "ot"
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)
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var (
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HostKey = key.New("http.host")
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URLKey = key.New("http.url")
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propagator = propagation.HTTPTraceContextPropagator{}
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)
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// Returns the Attributes, Context Entries, and SpanContext that were encoded by Inject.
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func Extract(ctx context.Context, req *http.Request) ([]core.KeyValue, []core.KeyValue, core.SpanContext) {
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sc, correlationCtx := propagator.Extract(ctx, req.Header)
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attrs := []core.KeyValue{
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URLKey.String(req.URL.String()),
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// Etc.
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}
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var correlationCtxKVs []core.KeyValue
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correlationCtx.Foreach(func(kv core.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 attrs, correlationCtxKVs, sc
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}
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func Inject(ctx context.Context, req *http.Request) {
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propagator.Inject(ctx, req.Header)
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}
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