chetanmeh commented on a change in pull request #2282: Distributed tracing 
support #2192
URL: 
https://github.com/apache/incubator-openwhisk/pull/2282#discussion_r194662887
 
 

 ##########
 File path: 
common/scala/src/main/scala/whisk/common/tracing/OpenTracingProvider.scala
 ##########
 @@ -0,0 +1,220 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 whisk.common.tracing
+
+import scala.collection.mutable
+import scala.collection.JavaConverters._
+import brave.Tracing
+import brave.opentracing.BraveTracer
+import brave.sampler.Sampler
+import io.opentracing.{Span, SpanContext, Tracer}
+import io.opentracing.util.GlobalTracer
+import io.opentracing.propagation.{Format, TextMapExtractAdapter, 
TextMapInjectAdapter}
+import zipkin2.reporter.{AsyncReporter, Sender}
+import zipkin2.reporter.okhttp3.OkHttpSender
+import pureconfig._
+import whisk.common.{LogMarkerToken, TransactionId}
+import whisk.core.ConfigKeys
+
+import scala.ref.WeakReference
+
+/**
+ * OpenTracing based implementation for tracing
+ */
+class OpenTracer(val tracer: Tracer) extends WhiskTracer {
+
+  /**
+   * Start a Trace for given service.
+   *
+   * @param transactionId transactionId to which this Trace belongs.
+   * @return TracedRequest which provides details about current service being 
traced.
+   */
+  override def startSpan(logMarker: LogMarkerToken, transactionId: 
TransactionId): Unit = {
+
+    val activeSpan: Option[Span] =
+      TracingCacheProvider.spanCache.get(transactionId.meta.id) match {
+        case Some(spanList) => {
+          //create a child span
+          val spanBuilder = tracer
+            .buildSpan(logMarker.action)
+            .withTag("transactionId", transactionId.meta.id)
+
+          Some(
+            spanList.last.get
+              .map(spanBuilder.asChildOf(_).startActive(true).span())
+              .getOrElse(spanBuilder.startActive(true).span()))
+
+        }
+        case None => {
+          //initialize list for this transactionId
+          val list: mutable.ListBuffer[WeakReference[Span]] = 
mutable.ListBuffer()
+          TracingCacheProvider.spanCache.put(transactionId.meta.id, list)
+
+          TracingCacheProvider.contextCache.get(transactionId.meta.id) match {
+            case Some(context) => {
+              //create child span if we have a tracing context
+              Some(
+                tracer
+                  .buildSpan(logMarker.action)
+                  .withTag("transactionId", transactionId.meta.id)
+                  .asChildOf(context)
+                  .startActive(true)
+                  .span())
+            }
+            case None => {
+              Some(
+                tracer
+                  .buildSpan(logMarker.action)
+                  .ignoreActiveSpan()
+                  .withTag("transactionId", transactionId.meta.id)
+                  .startActive(true)
+                  .span())
+            }
+          }
+        }
+      }
+
+    //add active span to list
+    if (activeSpan.isDefined)
+      TracingCacheProvider.spanCache.get(transactionId.meta.id).map(_.+=:(new 
WeakReference(activeSpan.get)))
+  }
+
+  /**
+   * Finish a Trace associated with given transactionId.
+   *
+   * @param transactionId
+   */
+  override def finishSpan(transactionId: TransactionId): Unit = {
+    clear(transactionId)
+  }
+
+  /**
+   * Register error
+   *
+   * @param transactionId
+   */
+  override def error(transactionId: TransactionId): Unit = {
+    clear(transactionId)
+  }
+
+  /**
+   * Get the current TraceContext which can be used for downstream services
+   *
+   * @param transactionId
+   * @return
+   */
+  override def getTraceContext(transactionId: TransactionId): 
Option[Map[String, String]] = {
+    var contextMap: Option[Map[String, String]] = None
+    TracingCacheProvider.spanCache.get(transactionId.meta.id) match {
+      case Some(spanList) => {
+        var map: java.util.Map[String, String] = new java.util.HashMap()
+        //inject latest span context in map
+        spanList.last.get match {
+          case Some(span) => {
+            tracer.inject(span.context(), Format.Builtin.TEXT_MAP, new 
TextMapInjectAdapter(map))
+            contextMap = Some(map.asScala.toMap)
+          }
+          case _ =>
+        }
+      }
+      case None => None
+    }
+    contextMap
+  }
+
+  /**
+   * Get the current TraceContext which can be used for downstream services
+   *
+   * @param transactionId
+   * @return
+   */
+  override def setTraceContext(transactionId: TransactionId, context: 
Option[Map[String, String]]) = {
+    context match {
+      case Some(scalaMap) => {
+        var javaMap: java.util.Map[String, String] =
+          
scala.collection.JavaConverters.mapAsJavaMapConverter(scalaMap).asJava
+        var ctx: SpanContext = tracer.extract(Format.Builtin.TEXT_MAP, new 
TextMapExtractAdapter(javaMap))
+        TracingCacheProvider.contextCache.put(transactionId.meta.id, ctx)
+      }
+      case None =>
+    }
+  }
+
+  private def clear(transactionId: TransactionId): Unit = {
+    TracingCacheProvider.spanCache.get(transactionId.meta.id) match {
+      case Some(spanList) => {
+        spanList.last.get.map(_.finish)
+        spanList.remove(spanList.size - 1)
+        if (spanList.isEmpty) {
+          TracingCacheProvider.spanCache.invalidate(transactionId.meta.id)
+          TracingCacheProvider.contextCache.invalidate(transactionId.meta.id)
+        }
+
+      }
+      case None =>
+    }
+  }
+}
+
+trait WhiskTracer {
+  def startSpan(logMarker: LogMarkerToken, transactionId: TransactionId): Unit 
= {}
+  def finishSpan(transactionId: TransactionId): Unit = {}
+  def error(transactionId: TransactionId): Unit = {}
+  def getTraceContext(transactionId: TransactionId): Option[Map[String, 
String]] = None
+  def setTraceContext(transactionId: TransactionId, context: 
Option[Map[String, String]]): Unit = {}
+}
+
+object WhiskTracerProvider {
+  val tracingConfig = loadConfigOrThrow[TracingConfig](ConfigKeys.tracing)
+
+  val tracer: WhiskTracer = createTracer(tracingConfig)
+
+  private def createTracer(tracingConfig: TracingConfig): WhiskTracer = {
+
+    tracingConfig.zipkin match {
+      case Some(zipkinConfig) => {
+        val zipkinConfig = tracingConfig.zipkin.get
+        if (!GlobalTracer.isRegistered) {
+          val sender: Sender = OkHttpSender.create(zipkinConfig.getUrl)
+          val spanReporter = AsyncReporter.create(sender)
 
 Review comment:
   `spanReporter` would probably [need to be closed][1]
   
   [1]: 
https://github.com/openzipkin/zipkin-reporter-java/blob/master/core/src/main/java/zipkin2/reporter/AsyncReporter.java#L78

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