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tracer.go
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tracer.go
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/*
* Copyright (c) 2022, Alibaba Group;
* Licensed 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 trace
import (
"bytes"
"io"
"log"
"github.com/jaegertracing/jaeger/model"
"github.com/cc-cheunggg/ioc-golang/extension/aop/trace/transport"
"github.com/opentracing/opentracing-go"
"github.com/uber/jaeger-client-go"
)
var tracer *wrapperTracer
var collectorAddress = ""
var appName = "ioc-golang-application"
// FIXME: invocation longer than 5s would not be collected
var collectTraceInterval = 5
type wrapperTracer struct {
rawTracer opentracing.Tracer
out chan []*model.Trace
subscribingTraceChan chan []*model.Trace
batchBufferOut chan *bytes.Buffer
subscribingBatchBufferChan chan *bytes.Buffer
}
func (w *wrapperTracer) getRawTracer() opentracing.Tracer {
return w.rawTracer
}
func (w *wrapperTracer) subscribeTrace(subscribingTraceChan chan []*model.Trace) {
transport.SetCollector(appName, subscribingTraceChan, collectTraceInterval)
w.subscribingTraceChan = subscribingTraceChan
}
func (w *wrapperTracer) removeSubscribingTrace() {
transport.RemoveCollector()
w.subscribingTraceChan = nil
}
func (w *wrapperTracer) subscribeBatchBuffer(subscribingBatchBufferChan chan *bytes.Buffer) {
w.subscribingBatchBufferChan = subscribingBatchBufferChan
}
func (w *wrapperTracer) removeSubscribingBatchBuffer() {
w.subscribingBatchBufferChan = nil
}
func (w *wrapperTracer) runCollectingTrace() {
for {
select {
case traces := <-w.out:
if len(traces) == 0 {
continue
}
if ch := w.subscribingTraceChan; ch != nil {
select {
case ch <- traces:
default:
log.Printf("[Trace AOP] failed to write back to trace debug server: %+v\n", traces)
}
}
case batchBuffer := <-w.batchBufferOut:
if batchBuffer == nil {
continue
}
if ch := w.subscribingBatchBufferChan; ch != nil {
select {
case ch <- batchBuffer:
default:
log.Printf("[Trace AOP] failed to write back batchBuffer to trace debug server: %s\n", batchBuffer.String())
}
}
}
}
}
func getGlobalTracer() *wrapperTracer {
if tracer == nil {
outCh := make(chan []*model.Trace)
batchBufferOut := make(chan *bytes.Buffer)
rawJaegerTracer, _ := newJaegerTracer(appName, collectorAddress, batchBufferOut)
tracer = &wrapperTracer{
rawTracer: rawJaegerTracer,
batchBufferOut: batchBufferOut,
out: outCh,
}
go tracer.runCollectingTrace()
}
return tracer
}
func getCollectorAddress() string {
return collectorAddress
}
func setCollectorAddress(addr string) {
collectorAddress = addr
}
func setAppName(name string) {
appName = name
}
func newJaegerTracer(service string, collectorAddress string, batchBufferOut chan *bytes.Buffer) (opentracing.Tracer, io.Closer) {
return jaeger.NewTracer(
service,
jaeger.NewConstSampler(true),
jaeger.NewRemoteReporter(transport.GetLocalWrappedHTTPTransportSingleton(collectorAddress, batchBufferOut)),
)
}