mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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3362421c9b
This is to shrink the PR #100. The only place where the registry.Variable type was used was metrics, so just inline that type into its only user. The use of the registry.Variable type in core.Key was limited to the Name field. The stats package also used the registry.Variable type, but seems that also only the Name field was used and the package is going to be dropped anyway.
102 lines
2.5 KiB
Go
102 lines
2.5 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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"encoding/binary"
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"net/http"
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"github.com/lightstep/tracecontext.go"
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"github.com/lightstep/tracecontext.go/tracestate"
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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/api/tag"
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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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encoding = binary.BigEndian
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)
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// Returns the Attributes, Context Tags, and SpanContext that were encoded by Inject.
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func Extract(req *http.Request) ([]core.KeyValue, []core.KeyValue, core.SpanContext) {
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tc, err := tracecontext.FromHeaders(req.Header)
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if err != nil {
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return nil, nil, core.SpanContext{}
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}
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var sc core.SpanContext
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sc.SpanID = encoding.Uint64(tc.TraceParent.SpanID[0:8])
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sc.TraceID.High = encoding.Uint64(tc.TraceParent.TraceID[0:8])
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sc.TraceID.Low = encoding.Uint64(tc.TraceParent.TraceID[8:16])
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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 tags []core.KeyValue
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for _, ts := range tc.TraceState {
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if ts.Vendor != Vendor {
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continue
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}
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// TODO: max-hops, type conversion questions answered,
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// case-conversion questions.
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tags = append(tags, key.New(ts.Tenant).String(ts.Value))
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}
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return attrs, tags, sc
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}
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type hinjector struct {
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*http.Request
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}
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func (h hinjector) Inject(sc core.SpanContext, tags tag.Map) {
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var tc tracecontext.TraceContext
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var sid [8]byte
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var tid [16]byte
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encoding.PutUint64(sid[0:8], sc.SpanID)
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encoding.PutUint64(tid[0:8], sc.TraceID.High)
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encoding.PutUint64(tid[8:16], sc.TraceID.Low)
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tc.TraceParent.Version = tracecontext.Version
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tc.TraceParent.TraceID = tid
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tc.TraceParent.SpanID = sid
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tc.TraceParent.Flags.Recorded = true // Note: not implemented.
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tags.Foreach(func(kv core.KeyValue) bool {
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// TODO: implement MaxHops
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tc.TraceState = append(tc.TraceState, tracestate.Member{
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Vendor: Vendor,
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Tenant: kv.Key.Name,
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Value: kv.Value.Emit(),
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})
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return true
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})
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tc.SetHeaders(h.Header)
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}
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