mirror of
https://github.com/prometheus/prometheus.git
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57 lines
2.2 KiB
Go
57 lines
2.2 KiB
Go
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// 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 (
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opentracing "github.com/opentracing/opentracing-go"
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)
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// ContribObserver can be registered with the Tracer to receive notifications
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// about new Spans. Modelled after github.com/opentracing-contrib/go-observer.
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type ContribObserver interface {
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// Create and return a span observer. Called when a span starts.
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// If the Observer is not interested in the given span, it must return (nil, false).
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// E.g :
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// func StartSpan(opName string, opts ...opentracing.StartSpanOption) {
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// var sp opentracing.Span
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// sso := opentracing.StartSpanOptions{}
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// if spanObserver, ok := Observer.OnStartSpan(span, opName, sso); ok {
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// // we have a valid SpanObserver
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// }
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// ...
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// }
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OnStartSpan(sp opentracing.Span, operationName string, options opentracing.StartSpanOptions) (ContribSpanObserver, bool)
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}
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// ContribSpanObserver is created by the Observer and receives notifications
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// about other Span events. This interface is meant to match
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// github.com/opentracing-contrib/go-observer, via duck typing, without
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// directly importing the go-observer package.
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type ContribSpanObserver 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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// wrapper observer for the old observers (see observer.go)
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type oldObserver struct {
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obs Observer
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}
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func (o *oldObserver) OnStartSpan(sp opentracing.Span, operationName string, options opentracing.StartSpanOptions) (ContribSpanObserver, bool) {
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spanObserver := o.obs.OnStartSpan(operationName, options)
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return spanObserver, spanObserver != nil
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}
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