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emitter.go
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emitter.go
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// Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with the License. A copy of the License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 xray
import (
"bytes"
"encoding/json"
"net"
"sync"
log "github.com/cihub/seelog"
)
// Header is added before sending segments to daemon.
var Header = []byte(`{"format": "json", "version": 1}` + "\n")
type emitter struct {
sync.Mutex
conn *net.UDPConn
}
var e = &emitter{}
func init() {
refreshEmitter()
}
func refreshEmitter() {
e.Lock()
e.conn, _ = net.DialUDP("udp", nil, privateCfg.DaemonAddr())
e.Unlock()
}
func emit(seg *Segment) {
if seg == nil || !seg.Sampled {
return
}
for _, p := range packSegments(seg, nil) {
if privateCfg.LogLevel() <= log.TraceLvl {
b := &bytes.Buffer{}
json.Indent(b, p, "", " ")
log.Trace(b.String())
}
e.Lock()
_, err := e.conn.Write(append(Header, p...))
if err != nil {
log.Error(err)
}
e.Unlock()
}
}
func packSegments(seg *Segment, outSegments [][]byte) [][]byte {
seg.Lock()
defer seg.Unlock()
trimSubsegment := func(s *Segment) []byte {
ss := privateCfg.StreamingStrategy()
for ss.RequiresStreaming(s) {
if len(s.rawSubsegments) == 0 {
break
}
cb := ss.StreamCompletedSubsegments(s)
outSegments = append(outSegments, cb...)
}
b, _ := json.Marshal(s)
return b
}
for _, s := range seg.rawSubsegments {
outSegments = packSegments(s, outSegments)
if b := trimSubsegment(s); b != nil {
seg.Subsegments = append(seg.Subsegments, b)
}
}
if seg.parent == nil {
if b := trimSubsegment(seg); b != nil {
outSegments = append(outSegments, b)
}
}
return outSegments
}