mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-14 10:13:10 +02:00
d4557c3dfa
- Simplify conditionals. - Remove unnecessary nil check. Go type assertions return a bool value indicating whether the assertion succeeded. When the assertion is performed on a nil value, the bool becomes false without a panic, therefore the nil check is unnecessary.
93 lines
2.5 KiB
Go
93 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 trace
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import (
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"context"
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"go.opentelemetry.io/otel/api/core"
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apitrace "go.opentelemetry.io/otel/api/trace"
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)
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type tracer struct {
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provider *Provider
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name string
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}
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var _ apitrace.Tracer = &tracer{}
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func (tr *tracer) Start(ctx context.Context, name string, o ...apitrace.StartOption) (context.Context, apitrace.Span) {
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var opts apitrace.StartConfig
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var parent core.SpanContext
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var remoteParent bool
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//TODO [rghetia] : Add new option for parent. If parent is configured then use that parent.
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for _, op := range o {
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op(&opts)
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}
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if relation := opts.Relation; relation.SpanContext != core.EmptySpanContext() {
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switch relation.RelationshipType {
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case apitrace.ChildOfRelationship, apitrace.FollowsFromRelationship:
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parent = relation.SpanContext
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remoteParent = true
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default:
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// Future relationship types may have different behavior,
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// e.g., adding a `Link` instead of setting the `parent`
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}
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} else if p, ok := apitrace.SpanFromContext(ctx).(*span); ok {
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p.addChild()
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parent = p.spanContext
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}
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spanName := tr.spanNameWithPrefix(name)
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span := startSpanInternal(tr, spanName, parent, remoteParent, opts)
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for _, l := range opts.Links {
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span.addLink(l)
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}
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span.SetAttributes(opts.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, spanName)
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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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func (tr *tracer) WithSpan(ctx context.Context, name string, body func(ctx context.Context) error) error {
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ctx, span := tr.Start(ctx, name)
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defer span.End()
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if err := body(ctx); err != nil {
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// TODO: set event with boolean attribute for error.
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return err
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}
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return nil
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}
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func (tr *tracer) spanNameWithPrefix(name string) string {
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if tr.name != "" {
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return tr.name + "/" + name
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}
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return name
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}
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