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https://github.com/open-telemetry/opentelemetry-go.git
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547d584da8
* Add global propagators The default global propagators are set to the chained W3C trace and correlation context propagators. * Use global propagators in plugins The httptrace and grpcplugins should also get some API for setting a propagator to use (the othttp plugin already has such an API), but that can come in some other PR. * Decrease indentation in trace propagators * Drop obsolete TODOs Now we do "something" with correlation context - it ends up in the context, and we put the context into the request, so the chained HTTP handler can access it too. The other TODO was about tag.Upsert which is long gone. * Do not unnecessarily update the request context The request context already contains the span (and we add some attribute there), so inserting it into context again is pointless. Co-authored-by: Joshua MacDonald <jmacd@users.noreply.github.com>
55 lines
1.6 KiB
Go
55 lines
1.6 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/global"
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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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)
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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, global.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.MapFromContext(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, global.Propagators(), req.Header)
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}
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