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/* =========================================================================================
* Copyright © 2013-2017 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.{URLDecoder, URLEncoder}
import java.nio.ByteBuffer
import java.util.concurrent.ThreadLocalRandom
import kamon.trace.SpanContext.{Baggage, SamplingDecision, Source}
import scala.collection.JavaConverters._
import kamon.util.HexCodec
trait SpanContextCodec[T] {
def inject(spanContext: SpanContext, carrier: T): Unit
def extract(carrier: T): Option[SpanContext]
}
trait TextMap {
def get(key: String): Option[String]
def put(key: String, value: String): Unit
def values: Iterator[(String, String)]
}
object SpanContextCodec {
trait Format[C]
object Format {
case object TextMap extends Format[TextMap]
case object HttpHeaders extends Format[TextMap]
case object Binary extends Format[ByteBuffer]
}
// val ExtendedB3: SpanContextCodec[TextMap] = new TextMapSpanCodec(
// traceIDKey = "X-B3-TraceId",
// parentIDKey = "X-B3-ParentSpanId",
// spanIDKey = "X-B3-SpanId",
// sampledKey = "X-B3-Sampled",
// baggageKey = "X-Kamon-Baggage-",
// baggageValueEncoder = urlEncode,
// baggageValueDecoder = urlDecode
// )
private def urlEncode(s: String): String = URLEncoder.encode(s, "UTF-8")
private def urlDecode(s: String): String = URLDecoder.decode(s, "UTF-8")
private class ExtendedB3(identityProvider: IdentityProvider) extends SpanContextCodec[TextMap] {
import ExtendedB3.Headers
override def inject(spanContext: SpanContext, carrier: TextMap): Unit = {
carrier.put(Headers.TraceIdentifier, baggageValueEncoder(spanContext.traceID.string))
carrier.put(parentIDKey, baggageValueEncoder(spanContext.parentID.string))
carrier.put(spanIDKey, baggageValueEncoder(spanContext.spanID.string))
spanContext.baggage.getAll().foreach {
case (key, value) => carrier.put(baggageKey + key, baggageValueEncoder(value))
}
}
override def extract(carrier: TextMap): Option[SpanContext] = {
val traceID = carrier.get(Headers.TraceIdentifier)
.map(identityProvider.traceIdentifierGenerator().from)
.getOrElse(IdentityProvider.NoIdentifier)
val spanID = carrier.get(Headers.SpanIdentifier)
.map(identityProvider.spanIdentifierGenerator().from)
.getOrElse(IdentityProvider.NoIdentifier)
if(traceID != IdentityProvider.NoIdentifier && spanID != IdentityProvider.NoIdentifier) {
val parentID = carrier.get(Headers.ParentSpanIdentifier)
.map(identityProvider.spanIdentifierGenerator().from)
.getOrElse(IdentityProvider.NoIdentifier)
val samplingDecision = carrier.get(Headers.Flags).orElse(carrier.get(Headers.Sampled)) match {
case Some(sampled) if sampled == "1" => SamplingDecision.Sample
case Some(sampled) if sampled == "0" => SamplingDecision.DoNotSample
case _ => SamplingDecision.Unknown
}
Some(SpanContext(traceID, spanID, parentID, samplingDecision, ???, Source.Remote))
} else None
val minimalSpanContext =
for {
traceID <- carrier.get(traceIDKey).map(identityProvider.traceIdentifierGenerator().from)
spanID <- carrier.get(spanIDKey).map(identityProvider.spanIdentifierGenerator().from)
} yield {
}
// var traceID: String = null
// var parentID: String = null
// var spanID: String = null
// var sampled: String = null
// var baggage: Map[String, String] = Map.empty
//
// carrier.iterator().asScala.foreach { entry =>
// if(entry.getKey.equals(traceIDKey))
// traceID = baggageValueDecoder(entry.getValue)
// else if(entry.getKey.equals(parentIDKey))
// parentID = baggageValueDecoder(entry.getValue)
// else if(entry.getKey.equals(spanIDKey))
// spanID = baggageValueDecoder(entry.getValue)
// else if(entry.getKey.equals(sampledKey))
// sampled = entry.getValue
// else if(entry.getKey.startsWith(baggagePrefix))
// baggage = baggage + (entry.getKey.substring(baggagePrefix.length) -> baggageValueDecoder(entry.getValue))
// }
//
// if(traceID != null && spanID != null) {
// val actualParent = if(parentID == null) 0L else decodeLong(parentID)
// val isSampled = if(sampled == null) sampler.decide(ThreadLocalRandom.current().nextLong()) else sampled.equals("1")
//
// new SpanContext(decodeLong(traceID), decodeLong(spanID), actualParent, isSampled, baggage)
// } else null
//
// None
}
private def encodeBaggage(baggage: Baggage): String = {
if(baggage.getAll().nonEmpty) {
baggage.getAll().foreach {
case (key, value) =>
}
} else ""
}
private def decodeLong(input: String): Long =
HexCodec.lowerHexToUnsignedLong(input)
private def encodeLong(input: Long): String =
HexCodec.toLowerHex(input)
}
object ExtendedB3 {
object Headers {
val TraceIdentifier = "X-B3-TraceId"
val ParentSpanIdentifier = "X-B3-ParentSpanId"
val SpanIdentifier = "X-B3-SpanId"
val Sampled = "X-B3-Sampled"
val Flags = "X-B3-Flags"
val Baggage = "X-B3-Extra-Baggage"
}
}
}
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