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package kamon
package trace
import kamon.metric.RecorderRegistry
import kamon.metric.instrument.DynamicRange
import scala.collection.JavaConverters._
import kamon.util.{Clock, MeasurementUnit}
object Span {
val MetricCategory = "span"
val LatencyMetricName = "elapsed-time"
val ErrorMetricName = "error"
val MetricTagPrefix = "metric."
val BooleanTagTrueValue = "1"
val BooleanTagFalseValue = "0"
case class LogEntry(timestamp: Long, fields: Map[String, _])
case class CompletedSpan(
context: SpanContext,
operationName: String,
startTimestampMicros: Long,
endTimestampMicros: Long,
tags: Map[String, String],
logs: Seq[LogEntry]
)
}
class Span(spanContext: SpanContext, initialOperationName: String, startTimestampMicros: Long,
recorderRegistry: RecorderRegistry, reporterRegistry: ReporterRegistryImpl) extends io.opentracing.Span {
private var isOpen: Boolean = true
private val isSampled: Boolean = true // TODO: User a proper sampler
private var operationName: String = initialOperationName
private var endTimestampMicros: Long = 0
private var logs = List.empty[Span.LogEntry]
private var tags = Map.empty[String, String]
private var metricTags = Map.empty[String, String]
override def log(fields: java.util.Map[String, _]): Span =
log(fields.asScala.asInstanceOf[Map[String, _]])
def log(fields: Map[String, _]): Span = synchronized {
if (isSampled && isOpen) {
logs = Span.LogEntry(Clock.microTimestamp(), fields) :: logs
}
this
}
override def log(timestampMicroseconds: Long, fields: java.util.Map[String, _]): Span =
log(timestampMicroseconds, fields.asScala.asInstanceOf[Map[String, _]])
def log(timestampMicroseconds: Long, fields: Map[String, _]): Span = synchronized {
if(isSampled && isOpen) {
logs = Span.LogEntry(timestampMicroseconds, fields) :: logs
}
this
}
override def log(event: String): Span = synchronized {
if(isSampled && isOpen) {
logs = Span.LogEntry(Clock.microTimestamp(), Map("event" -> event)) :: logs
}
this
}
override def log(timestampMicroseconds: Long, event: String): Span = synchronized {
if(isSampled && isOpen) {
logs = Span.LogEntry(timestampMicroseconds, Map("event" -> event)) :: logs
}
this
}
override def log(eventName: String, payload: scala.Any): Span = synchronized {
if(isSampled && isOpen) {
logs = Span.LogEntry(Clock.microTimestamp(), Map(eventName -> payload)) :: logs
}
this
}
override def log(timestampMicroseconds: Long, eventName: String, payload: scala.Any): Span = synchronized {
if(isSampled && isOpen) {
logs = Span.LogEntry(timestampMicroseconds, Map(eventName -> payload)) :: logs
}
this
}
override def getBaggageItem(key: String): String =
spanContext.getBaggage(key)
override def context(): SpanContext =
spanContext
override def setTag(key: String, value: String): Span = synchronized {
if (isOpen) {
extractMetricTag(key, value)
if(isSampled)
tags = tags ++ Map(key -> value)
}
this
}
override def setTag(key: String, value: Boolean): Span = {
if (isOpen) {
val tagValue = if(value) Span.BooleanTagTrueValue else Span.BooleanTagFalseValue
extractMetricTag(key, tagValue)
if(isSampled)
tags = tags + (key -> tagValue)
}
this
}
override def setTag(key: String, value: Number): Span = {
if (isOpen) {
val tagValue = String.valueOf(value)
extractMetricTag(key, tagValue)
if(isSampled)
tags = tags + (key -> tagValue)
}
this
}
def setMetricTag(key: String, value: String): Span = synchronized {
if (isOpen) {
metricTags = metricTags ++ Map(key -> value)
}
this
}
override def setBaggageItem(key: String, value: String): Span = synchronized {
if (isOpen) {
spanContext.addBaggageItem(key, value)
}
this
}
override def setOperationName(operationName: String): Span = {
if(isOpen) {
this.operationName = operationName
}
this
}
private def extractMetricTag(tag: String, value: String): Unit = {
if(tag.startsWith(Span.MetricTagPrefix)) {
metricTags = metricTags ++ Map(tag.substring(Span.MetricTagPrefix.length) -> value)
}
}
override def finish(): Unit =
finish(Clock.microTimestamp())
override def finish(finishMicros: Long): Unit =
if(isOpen) {
isOpen = false
endTimestampMicros = finishMicros
recordSpanMetrics()
reporterRegistry.reportSpan(completedSpan)
}
private def completedSpan: Span.CompletedSpan =
Span.CompletedSpan(spanContext, operationName, startTimestampMicros, endTimestampMicros, tags, logs)
private def recordSpanMetrics(): Unit = {
val elapsedTime = endTimestampMicros - startTimestampMicros
val recorder = recorderRegistry.getRecorder(operationName, Span.MetricCategory, metricTags)
recorder
.histogram(Span.LatencyMetricName, MeasurementUnit.time.microseconds, DynamicRange.Default)
.record(elapsedTime)
tags.get("error").foreach { errorTag =>
if(errorTag != null && errorTag.equals(Span.BooleanTagTrueValue)) {
recorder.counter(Span.ErrorMetricName).increment()
}
}
}
}
|
