/
tracer.go
70 lines (58 loc) · 2.16 KB
/
tracer.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"context"
apitrace "go.opentelemetry.io/otel/api/trace"
"go.opentelemetry.io/otel/internal/trace/parent"
"go.opentelemetry.io/otel/sdk/instrumentation"
)
type tracer struct {
provider *TracerProvider
instrumentationLibrary instrumentation.Library
}
var _ apitrace.Tracer = &tracer{}
// Start starts a Span and returns it along with a context containing it.
//
// The Span is created with the provided name and as a child of any existing
// span context found in the passed context. The created Span will be
// configured appropriately by any SpanOption passed. Any Timestamp option
// passed will be used as the start time of the Span's life-cycle.
func (tr *tracer) Start(ctx context.Context, name string, options ...apitrace.SpanOption) (context.Context, apitrace.Span) {
config := apitrace.NewSpanConfig(options...)
parentSpanContext, remoteParent, links := parent.GetSpanContextAndLinks(ctx, config.NewRoot)
if p := apitrace.SpanFromContext(ctx); p != nil {
if sdkSpan, ok := p.(*span); ok {
sdkSpan.addChild()
}
}
span := startSpanInternal(tr, name, parentSpanContext, remoteParent, config)
for _, l := range links {
span.addLink(l)
}
for _, l := range config.Links {
span.addLink(l)
}
span.SetAttributes(config.Attributes...)
span.tracer = tr
if span.IsRecording() {
sps, _ := tr.provider.spanProcessors.Load().(spanProcessorStates)
for _, sp := range sps {
sp.sp.OnStart(span.data)
}
}
ctx, end := startExecutionTracerTask(ctx, name)
span.executionTracerTaskEnd = end
return apitrace.ContextWithSpan(ctx, span), span
}