mirror of
https://gitea.com/Lydanne/buildx.git
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76 lines
2.3 KiB
Go
76 lines
2.3 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 trace // import "go.opentelemetry.io/otel/sdk/trace"
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import (
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"context"
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rt "runtime/trace"
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"go.opentelemetry.io/otel/trace"
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"go.opentelemetry.io/otel/sdk/instrumentation"
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)
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type tracer struct {
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provider *TracerProvider
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instrumentationLibrary instrumentation.Library
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}
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var _ trace.Tracer = &tracer{}
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// Start starts a Span and returns it along with a context containing it.
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//
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// The Span is created with the provided name and as a child of any existing
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// span context found in the passed context. The created Span will be
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// configured appropriately by any SpanOption passed. Any Timestamp option
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// passed will be used as the start time of the Span's life-cycle.
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func (tr *tracer) Start(ctx context.Context, name string, options ...trace.SpanStartOption) (context.Context, trace.Span) {
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config := trace.NewSpanStartConfig(options...)
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// For local spans created by this SDK, track child span count.
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if p := trace.SpanFromContext(ctx); p != nil {
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if sdkSpan, ok := p.(*span); ok {
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sdkSpan.addChild()
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}
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}
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span := startSpanInternal(ctx, tr, name, config)
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for _, l := range config.Links() {
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span.addLink(l)
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}
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span.SetAttributes(config.Attributes()...)
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span.tracer = tr
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if span.IsRecording() {
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sps, _ := tr.provider.spanProcessors.Load().(spanProcessorStates)
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for _, sp := range sps {
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sp.sp.OnStart(ctx, span)
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}
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}
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ctx, span.executionTracerTaskEnd = func(ctx context.Context) (context.Context, func()) {
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if !rt.IsEnabled() {
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// Avoid additional overhead if
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// runtime/trace is not enabled.
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return ctx, func() {}
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}
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nctx, task := rt.NewTask(ctx, name)
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return nctx, task.End
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}(ctx)
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return trace.ContextWithSpan(ctx, span), span
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}
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