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https://github.com/open-telemetry/opentelemetry-go.git
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6b97bb047a
Correlation context propagation shouldn't be a part of the trace package - it is a different aspect of the propagation cross-cutting concern. This commit also adds a DefaultHTTPPropagator function for correlation context propagation and makes the plugins use it. Co-authored-by: Joshua MacDonald <jmacd@users.noreply.github.com>
61 lines
1.8 KiB
Go
61 lines
1.8 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/otel/api/core"
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"go.opentelemetry.io/otel/api/correlation"
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"go.opentelemetry.io/otel/api/key"
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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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var (
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HostKey = key.New("http.host")
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URLKey = key.New("http.url")
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tcPropagator = trace.DefaultHTTPPropagator()
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ccPropagator = correlation.DefaultHTTPPropagator()
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propagators = propagation.New(
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propagation.WithInjectors(tcPropagator, ccPropagator),
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propagation.WithExtractors(tcPropagator, ccPropagator),
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)
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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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ctx = propagation.ExtractHTTP(ctx, propagators, 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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correlation.FromContext(ctx).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, trace.RemoteSpanContextFromContext(ctx)
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}
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func Inject(ctx context.Context, req *http.Request) {
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propagation.InjectHTTP(ctx, propagators, req.Header)
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}
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