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segment.go
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segment.go
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// Licensed to SkyAPM org under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. SkyAPM org licenses this file to you 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 go2sky
import (
"sync/atomic"
"github.com/SkyAPM/go2sky/internal/idgen"
"github.com/SkyAPM/go2sky/internal/tool"
"github.com/SkyAPM/go2sky/propagation"
"github.com/SkyAPM/go2sky/reporter/grpc/common"
v2 "github.com/SkyAPM/go2sky/reporter/grpc/language-agent-v2"
)
func newSegmentSpan(defaultSpan *defaultSpan, parentSpan segmentSpan) (s segmentSpan) {
ssi := &segmentSpanImpl{
defaultSpan: *defaultSpan,
}
ssi.createSegmentContext(parentSpan)
if parentSpan == nil || !parentSpan.segmentRegister() {
rs := newSegmentRoot(ssi)
rs.createRootSegmentContext(parentSpan)
s = rs
} else {
s = ssi
}
return
}
// SegmentContext is the context in a segment
type SegmentContext struct {
TraceID []int64
SegmentID []int64
SpanID int32
ParentSpanID int32
ParentSegmentID []int64
collect chan<- ReportedSpan
refNum *int32
spanIDGenerator *int32
}
// ReportedSpan is accessed by Reporter to load reported data
type ReportedSpan interface {
Context() *SegmentContext
Refs() []*propagation.SpanContext
StartTime() int64
EndTime() int64
OperationName() string
Peer() string
SpanType() common.SpanType
SpanLayer() common.SpanLayer
IsError() bool
Tags() []*common.KeyStringValuePair
Logs() []*v2.Log
ComponentID() int32
}
type segmentSpan interface {
Span
context() SegmentContext
segmentRegister() bool
}
type segmentSpanImpl struct {
defaultSpan
SegmentContext
}
// For Span
func (s *segmentSpanImpl) End() {
s.defaultSpan.End()
go func() {
s.Context().collect <- s
}()
}
// For Reported Span
func (s *segmentSpanImpl) Context() *SegmentContext {
return &s.SegmentContext
}
func (s *segmentSpanImpl) Refs() []*propagation.SpanContext {
return s.defaultSpan.Refs
}
func (s *segmentSpanImpl) StartTime() int64 {
return tool.Millisecond(s.defaultSpan.StartTime)
}
func (s *segmentSpanImpl) EndTime() int64 {
return tool.Millisecond(s.defaultSpan.EndTime)
}
func (s *segmentSpanImpl) OperationName() string {
return s.defaultSpan.OperationName
}
func (s *segmentSpanImpl) Peer() string {
return s.defaultSpan.Peer
}
func (s *segmentSpanImpl) SpanType() common.SpanType {
return common.SpanType(s.defaultSpan.SpanType)
}
func (s *segmentSpanImpl) SpanLayer() common.SpanLayer {
return s.defaultSpan.Layer
}
func (s *segmentSpanImpl) IsError() bool {
return s.defaultSpan.IsError
}
func (s *segmentSpanImpl) Tags() []*common.KeyStringValuePair {
return s.defaultSpan.Tags
}
func (s *segmentSpanImpl) Logs() []*v2.Log {
return s.defaultSpan.Logs
}
func (s *segmentSpanImpl) ComponentID() int32 {
return s.defaultSpan.ComponentID
}
func (s *segmentSpanImpl) context() SegmentContext {
return s.SegmentContext
}
func (s *segmentSpanImpl) segmentRegister() bool {
for {
o := atomic.LoadInt32(s.Context().refNum)
if o < 0 {
return false
}
if atomic.CompareAndSwapInt32(s.Context().refNum, o, o+1) {
return true
}
}
}
func (s *segmentSpanImpl) createSegmentContext(parent segmentSpan) {
if parent == nil {
s.SegmentContext = SegmentContext{}
if len(s.defaultSpan.Refs) > 0 {
s.TraceID = s.defaultSpan.Refs[0].TraceID
} else {
s.TraceID = idgen.GenerateGlobalID()
}
} else {
s.SegmentContext = parent.context()
s.ParentSegmentID = s.SegmentID
s.ParentSpanID = s.SpanID
s.SpanID = atomic.AddInt32(s.Context().spanIDGenerator, 1)
}
}
type rootSegmentSpan struct {
*segmentSpanImpl
notify <-chan ReportedSpan
segment []ReportedSpan
doneCh chan int32
}
func (rs *rootSegmentSpan) End() {
rs.defaultSpan.End()
go func() {
rs.doneCh <- atomic.SwapInt32(rs.Context().refNum, -1)
}()
}
func (rs *rootSegmentSpan) createRootSegmentContext(parent segmentSpan) {
rs.SegmentID = idgen.GenerateScopedGlobalID(int64(rs.tracer.instanceID))
i := int32(0)
rs.spanIDGenerator = &i
rs.SpanID = i
rs.ParentSpanID = -1
}
func newSegmentRoot(segmentSpan *segmentSpanImpl) *rootSegmentSpan {
s := &rootSegmentSpan{
segmentSpanImpl: segmentSpan,
}
var init int32
s.refNum = &init
ch := make(chan ReportedSpan)
s.collect = ch
s.notify = ch
s.segment = make([]ReportedSpan, 0, 10)
s.doneCh = make(chan int32)
go func() {
total := -1
defer close(ch)
defer close(s.doneCh)
for {
select {
case span := <-s.notify:
s.segment = append(s.segment, span)
case n := <-s.doneCh:
total = int(n)
}
if total == len(s.segment) {
break
}
}
s.tracer.reporter.Send(append(s.segment, s))
}()
return s
}