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98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
// Copyright 2017, OpenCensus 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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"sync"
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"sync/atomic"
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"time"
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)
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// Exporter is a type for functions that receive sampled trace spans.
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//
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// The ExportSpan method should be safe for concurrent use and should return
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// quickly; if an Exporter takes a significant amount of time to process a
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// SpanData, that work should be done on another goroutine.
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//
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// The SpanData should not be modified, but a pointer to it can be kept.
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type Exporter interface {
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ExportSpan(s *SpanData)
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}
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type exportersMap map[Exporter]struct{}
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var (
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exporterMu sync.Mutex
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exporters atomic.Value
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)
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// RegisterExporter adds to the list of Exporters that will receive sampled
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// trace spans.
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//
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// Binaries can register exporters, libraries shouldn't register exporters.
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func RegisterExporter(e Exporter) {
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exporterMu.Lock()
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new := make(exportersMap)
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if old, ok := exporters.Load().(exportersMap); ok {
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for k, v := range old {
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new[k] = v
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}
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}
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new[e] = struct{}{}
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exporters.Store(new)
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exporterMu.Unlock()
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}
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// UnregisterExporter removes from the list of Exporters the Exporter that was
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// registered with the given name.
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func UnregisterExporter(e Exporter) {
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exporterMu.Lock()
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new := make(exportersMap)
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if old, ok := exporters.Load().(exportersMap); ok {
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for k, v := range old {
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new[k] = v
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}
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}
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delete(new, e)
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exporters.Store(new)
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exporterMu.Unlock()
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}
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// SpanData contains all the information collected by a Span.
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type SpanData struct {
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SpanContext
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ParentSpanID SpanID
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SpanKind int
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Name string
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StartTime time.Time
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// The wall clock time of EndTime will be adjusted to always be offset
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// from StartTime by the duration of the span.
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EndTime time.Time
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// The values of Attributes each have type string, bool, or int64.
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Attributes map[string]interface{}
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Annotations []Annotation
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MessageEvents []MessageEvent
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Status
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Links []Link
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HasRemoteParent bool
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DroppedAttributeCount int
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DroppedAnnotationCount int
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DroppedMessageEventCount int
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DroppedLinkCount int
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// ChildSpanCount holds the number of child span created for this span.
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ChildSpanCount int
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}
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