7c9314f231
* swarm: propagate ctx, enable opentracing * swarm/tracing: log error when tracing is misconfigured
89 lines
2.8 KiB
Go
89 lines
2.8 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
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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 jaeger
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import opentracing "github.com/opentracing/opentracing-go"
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// Observer can be registered with the Tracer to receive notifications about
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// new Spans.
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//
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// Deprecated: use jaeger.ContribObserver instead.
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type Observer interface {
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OnStartSpan(operationName string, options opentracing.StartSpanOptions) SpanObserver
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}
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// SpanObserver is created by the Observer and receives notifications about
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// other Span events.
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//
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// Deprecated: use jaeger.ContribSpanObserver instead.
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type SpanObserver interface {
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OnSetOperationName(operationName string)
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OnSetTag(key string, value interface{})
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OnFinish(options opentracing.FinishOptions)
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}
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// compositeObserver is a dispatcher to other observers
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type compositeObserver struct {
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observers []ContribObserver
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}
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// compositeSpanObserver is a dispatcher to other span observers
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type compositeSpanObserver struct {
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observers []ContribSpanObserver
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}
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// noopSpanObserver is used when there are no observers registered
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// on the Tracer or none of them returns span observers from OnStartSpan.
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var noopSpanObserver = &compositeSpanObserver{}
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func (o *compositeObserver) append(contribObserver ContribObserver) {
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o.observers = append(o.observers, contribObserver)
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}
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func (o *compositeObserver) OnStartSpan(sp opentracing.Span, operationName string, options opentracing.StartSpanOptions) ContribSpanObserver {
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var spanObservers []ContribSpanObserver
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for _, obs := range o.observers {
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spanObs, ok := obs.OnStartSpan(sp, operationName, options)
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if ok {
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if spanObservers == nil {
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spanObservers = make([]ContribSpanObserver, 0, len(o.observers))
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}
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spanObservers = append(spanObservers, spanObs)
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}
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}
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if len(spanObservers) == 0 {
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return noopSpanObserver
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}
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return &compositeSpanObserver{observers: spanObservers}
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}
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func (o *compositeSpanObserver) OnSetOperationName(operationName string) {
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for _, obs := range o.observers {
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obs.OnSetOperationName(operationName)
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}
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}
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func (o *compositeSpanObserver) OnSetTag(key string, value interface{}) {
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for _, obs := range o.observers {
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obs.OnSetTag(key, value)
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}
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}
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func (o *compositeSpanObserver) OnFinish(options opentracing.FinishOptions) {
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for _, obs := range o.observers {
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obs.OnFinish(options)
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}
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}
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