1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* =========================================================================================
* Copyright © 2013 the kamon project <http://kamon.io/>
*
* 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 kamon.trace
import java.net.InetAddress
import java.util.concurrent.atomic.AtomicLong
import akka.actor._
import com.typesafe.config.Config
import kamon.Kamon
import kamon.metric.MetricsModule
import kamon.util._
import scala.util.Try
trait TracerModule {
def newContext(name: String): TraceContext
def newContext(name: String, token: Option[String]): TraceContext
def newContext(name: String, token: Option[String], timestamp: RelativeNanoTimestamp, isOpen: Boolean, isLocal: Boolean): TraceContext
def subscribe(subscriber: ActorRef): Unit
def unsubscribe(subscriber: ActorRef): Unit
}
object Tracer {
private val _traceContextStorage = new ThreadLocal[TraceContext] {
override def initialValue(): TraceContext = EmptyTraceContext
}
def currentContext: TraceContext =
_traceContextStorage.get()
def setCurrentContext(context: TraceContext): Unit =
_traceContextStorage.set(context)
def clearCurrentContext: Unit =
_traceContextStorage.remove()
def withContext[T](context: TraceContext)(code: ⇒ T): T = {
val oldContext = _traceContextStorage.get()
_traceContextStorage.set(context)
try code finally _traceContextStorage.set(oldContext)
}
// Java variant.
def withContext[T](context: TraceContext, code: Supplier[T]): T =
withContext(context)(code.get)
def withNewContext[T](traceName: String, traceToken: Option[String], autoFinish: Boolean)(code: ⇒ T): T = {
withContext(Kamon.tracer.newContext(traceName, traceToken)) {
val codeResult = code
if (autoFinish)
currentContext.finish()
codeResult
}
}
def withNewContext[T](traceName: String)(code: ⇒ T): T =
withNewContext(traceName, None, false)(code)
def withNewContext[T](traceName: String, traceToken: Option[String])(code: ⇒ T): T =
withNewContext(traceName, traceToken, false)(code)
def withNewContext[T](traceName: String, autoFinish: Boolean)(code: ⇒ T): T =
withNewContext(traceName, None, autoFinish)(code)
// Java variants.
def withNewContext[T](traceName: String, traceToken: Option[String], autoFinish: Boolean, code: Supplier[T]): T =
withNewContext(traceName, traceToken, autoFinish)(code.get)
def withNewContext[T](traceName: String, code: Supplier[T]): T =
withNewContext(traceName, None, false)(code.get)
def withNewContext[T](traceName: String, traceToken: Option[String], code: Supplier[T]): T =
withNewContext(traceName, traceToken, false)(code.get)
def withNewContext[T](traceName: String, autoFinish: Boolean, code: Supplier[T]): T =
withNewContext(traceName, None, autoFinish)(code.get)
}
private[kamon] class TracerModuleImpl(metricsExtension: MetricsModule, config: Config) extends TracerModule {
private val _settings = TraceSettings(config)
private val _hostnamePrefix = Try(InetAddress.getLocalHost.getHostName).getOrElse("unknown-localhost")
private val _tokenCounter = new AtomicLong
private val _subscriptions = new LazyActorRef
private val _incubator = new LazyActorRef
private def newToken: String =
_hostnamePrefix + "-" + String.valueOf(_tokenCounter.incrementAndGet())
def newContext(name: String): TraceContext =
createTraceContext(name, None)
def newContext(name: String, token: Option[String]): TraceContext =
createTraceContext(name, token)
def newContext(name: String, token: Option[String], timestamp: RelativeNanoTimestamp, isOpen: Boolean, isLocal: Boolean): TraceContext =
createTraceContext(name, token, timestamp, isOpen, isLocal)
private def createTraceContext(traceName: String, token: Option[String], startTimestamp: RelativeNanoTimestamp = RelativeNanoTimestamp.now,
isOpen: Boolean = true, isLocal: Boolean = true): TraceContext = {
def newMetricsOnlyContext(token: String): TraceContext =
new MetricsOnlyContext(traceName, token, isOpen, _settings.levelOfDetail, startTimestamp, null)
val traceToken = token.getOrElse(newToken)
if (_settings.levelOfDetail == LevelOfDetail.MetricsOnly || !isLocal)
newMetricsOnlyContext(traceToken)
else {
if (!_settings.sampler.shouldTrace)
newMetricsOnlyContext(traceToken)
else
new TracingContext(traceName, traceToken, true, _settings.levelOfDetail, isLocal, startTimestamp, null, dispatchTracingContext)
}
}
def subscribe(subscriber: ActorRef): Unit =
_subscriptions.tell(TraceSubscriptions.Subscribe(subscriber))
def unsubscribe(subscriber: ActorRef): Unit =
_subscriptions.tell(TraceSubscriptions.Unsubscribe(subscriber))
private[kamon] def dispatchTracingContext(trace: TracingContext): Unit =
if (_settings.sampler.shouldReport(trace.elapsedTime))
if (trace.shouldIncubate)
_incubator.tell(trace)
else
_subscriptions.tell(trace.generateTraceInfo)
/**
* Tracer Extension initialization.
*/
private var _system: ActorSystem = null
private lazy val _start = {
val subscriptions = _system.actorOf(Props[TraceSubscriptions], "trace-subscriptions")
_subscriptions.point(subscriptions)
_incubator.point(_system.actorOf(Incubator.props(subscriptions)))
}
def start(system: ActorSystem): Unit = synchronized {
_system = system
_start
_system = null
}
}
private[kamon] object TracerModuleImpl {
def apply(metricsExtension: MetricsModule, config: Config) =
new TracerModuleImpl(metricsExtension, config)
}
case class TraceInfo(name: String, token: String, timestamp: NanoTimestamp, elapsedTime: NanoInterval, metadata: Map[String, String], segments: List[SegmentInfo])
case class SegmentInfo(name: String, category: String, library: String, timestamp: NanoTimestamp, elapsedTime: NanoInterval, metadata: Map[String, String])
|
