71 lines
2.1 KiB
Go
71 lines
2.1 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
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import (
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"context"
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apitrace "go.opentelemetry.io/otel/api/trace"
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"go.opentelemetry.io/otel/internal/trace/parent"
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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 *Provider
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instrumentationLibrary instrumentation.Library
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}
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var _ apitrace.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 ...apitrace.SpanOption) (context.Context, apitrace.Span) {
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config := apitrace.SpanConfigure(options)
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parentSpanContext, remoteParent, links := parent.GetSpanContextAndLinks(ctx, config.NewRoot)
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if p := apitrace.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(tr, name, parentSpanContext, remoteParent, config)
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for _, l := range links {
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span.addLink(l)
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}
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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().(spanProcessorMap)
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for sp := range sps {
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sp.OnStart(span.data)
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}
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}
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ctx, end := startExecutionTracerTask(ctx, name)
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span.executionTracerTaskEnd = end
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return apitrace.ContextWithSpan(ctx, span), span
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}
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