Add Zipkin exporter support

.circleci/config.yml

@@ -27,7 +27,7 @@ jobs:
 
       - run:
           name: Build Project
-          command: GRADLE_OPTS="-Dorg.gradle.jvmargs='-Xmx1G -Xms64M' -Dota.forkedMaxHeapSize=1G -Dota.forkedMinHeapSize=64M" ./gradlew clean compileTestGroovy compileLatestDepTestGroovy compileTestScala compileLatestDepTestScala compileTestJava compileLatestDepTestJava :opentelemetry-auto:shadowJar :auto-exporters:opentelemetry-auto-exporters-jaeger:shadowJar :auto-exporters:opentelemetry-auto-exporters-otlp:shadowJar :auto-exporters:opentelemetry-auto-exporters-logging:shadowJar --build-cache --parallel --stacktrace --no-daemon --max-workers=8
+          command: GRADLE_OPTS="-Dorg.gradle.jvmargs='-Xmx1G -Xms64M' -Dota.forkedMaxHeapSize=1G -Dota.forkedMinHeapSize=64M" ./gradlew clean compileTestGroovy compileLatestDepTestGroovy compileTestScala compileLatestDepTestScala compileTestJava compileLatestDepTestJava :opentelemetry-auto:shadowJar :auto-exporters:opentelemetry-auto-exporters-jaeger:shadowJar :auto-exporters:opentelemetry-auto-exporters-otlp:shadowJar :auto-exporters:opentelemetry-auto-exporters-logging:shadowJar :auto-exporters:opentelemetry-auto-exporters-zipkin:shadowJar --build-cache --parallel --stacktrace --no-daemon --max-workers=8
 
       - run:
           name: Collect Libs

README.md

@@ -45,6 +45,14 @@ only supports gRPC as its communications protocol.
 | ota.exporter.jaeger.endpoint     | OTA_EXPORTER_JAEGER_ENDPOINT     | The Jaeger endpoint to connect to. Currently only gRPC is supported. |
 | ota.exporter.jaeger.service.name | OTA_EXPORTER_JAEGER_SERVICE_NAME | The service name of this JVM instance                                |
 
+#### Zipkin exporter
+A simple wrapper for the Zipkin exporter of opentelemetry-java. It POSTs json in [Zipkin format](https://zipkin.io/zipkin-api/#/default/post_spans) to a specified HTTP URL.
+
+| System property                  | Environment variable             | Purpose                                                              |
+|----------------------------------|----------------------------------|----------------------------------------------------------------------|
+| ota.exporter.zipkin.endpoint     | OTA_EXPORTER_ZIPKIN_ENDPOINT     | The Zipkin endpoint to connect to. Currently only HTTP is supported. |
+| ota.exporter.zipkin.service.name | OTA_EXPORTER_ZIPKIN_SERVICE_NAME | The service name of this JVM instance    
+
 #### OTLP exporter
 
 A simple wrapper for the OTLP exporter of opentelemetry-java.

auto-exporters/auto-exporters.gradle

@@ -6,17 +6,20 @@ dependencies {
   testCompile project(':auto-exporters:opentelemetry-auto-exporters-otlp')
   testCompile project(':auto-exporters:opentelemetry-auto-exporters-jaeger')
   testCompile project(':auto-exporters:opentelemetry-auto-exporters-logging')
+  testCompile project(':auto-exporters:opentelemetry-auto-exporters-zipkin')
 }
 
 tasks.withType(Test).configureEach() {
   dependsOn ':auto-exporters:opentelemetry-auto-exporters-otlp:shadowJar'
   dependsOn ':auto-exporters:opentelemetry-auto-exporters-jaeger:shadowJar'
   dependsOn ':auto-exporters:opentelemetry-auto-exporters-logging:shadowJar'
+  dependsOn ':auto-exporters:opentelemetry-auto-exporters-zipkin:shadowJar'
   doFirst {
     systemProperty 'projectVersion', allprojects.version[0]
     systemProperty 'adapterRoot', "${rootDir}/auto-exporters"
     systemProperty 'otlpExporterJar', project(':auto-exporters:opentelemetry-auto-exporters-otlp').tasks.shadowJar.archivePath
     systemProperty 'jaegerExporterJar', project(':auto-exporters:opentelemetry-auto-exporters-jaeger').tasks.shadowJar.archivePath
     systemProperty 'loggingExporterJar', project(':auto-exporters:opentelemetry-auto-exporters-logging').tasks.shadowJar.archivePath
+    systemProperty 'zipkinExporterJar', project(':auto-exporters:opentelemetry-auto-exporters-zipkin').tasks.shadowJar.archivePath
   }
 }

auto-exporters/src/test/groovy/io/opentelemetry/auto/exporteradapters/ExporterAdaptersTest.groovy

@@ -34,6 +34,9 @@ class ExporterAdaptersTest extends Specification {
   @Shared
   def loggingExporterJar = System.getProperty("loggingExporterJar")
 
+  @Shared
+  def zipkinExporterJar = System.getProperty("zipkinExporterJar")
+
   @Shared
   def jaegerDir = new File("${adapterRoot}/jaeger-adapter/build/libs")
 
@@ -45,7 +48,7 @@ class ExporterAdaptersTest extends Specification {
     file != null
 
     where:
-    exporter << [otlpExporterJar, jaegerExporterJar, loggingExporterJar]
+    exporter << [otlpExporterJar, jaegerExporterJar, loggingExporterJar, zipkinExporterJar]
   }
 
   def "test exporter load"() {
@@ -70,5 +73,6 @@ class ExporterAdaptersTest extends Specification {
     otlpExporterJar    | 'io.opentelemetry.auto.exporters.otlp.OtlpSpanExporterFactory'
     jaegerExporterJar  | 'io.opentelemetry.auto.exporters.jaeger.JaegerExporterFactory'
     loggingExporterJar | 'io.opentelemetry.auto.exporters.logging.LoggingExporterFactory'
+    zipkinExporterJar  | 'io.opentelemetry.auto.exporters.zipkin.ZipkinExporterFactory'
   }
 }

auto-exporters/zipkin/src/main/java/io/opentelemetry/auto/exporters/zipkin/ZipkinExporterFactory.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * 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 io.opentelemetry.auto.exporters.zipkin;
+
+import io.opentelemetry.exporters.zipkin.ZipkinExporterConfiguration;
+import io.opentelemetry.exporters.zipkin.ZipkinSpanExporter;
+import io.opentelemetry.sdk.contrib.auto.config.Config;
+import io.opentelemetry.sdk.contrib.auto.config.SpanExporterFactory;
+import io.opentelemetry.sdk.trace.export.SpanExporter;
+import zipkin2.reporter.okhttp3.OkHttpSender;
+
+public class ZipkinExporterFactory implements SpanExporterFactory {
+  private static final String ZIPKIN_ENDPOINT = "zipkin.endpoint";
+  private static final String DEFAULT_ZIPKIN_ENDPOINT = "http://localhost:9411/api/v2/spans";
+
+  private static final String ZIPKIN_SERVICE_NAME = "zipkin.service.name";
+  private static final String DEFAULT_ZIPKIN_SERVICE_NAME = "(unknown service)";
+
+  @Override
+  public SpanExporter fromConfig(Config config) {
+    final String zipkinEndpoint = config.getString(ZIPKIN_ENDPOINT, DEFAULT_ZIPKIN_ENDPOINT);
+    final String serviceName = config.getString(ZIPKIN_SERVICE_NAME, DEFAULT_ZIPKIN_SERVICE_NAME);
+    return ZipkinSpanExporter.create(
+        ZipkinExporterConfiguration.builder()
+            .setSender(OkHttpSender.create(zipkinEndpoint))
+            .setServiceName(serviceName)
+            .build());
+  }
+}

auto-exporters/zipkin/src/main/resources/META-INF/services/io.opentelemetry.sdk.contrib.auto.config.SpanExporterFactory

@@ -0,0 +1 @@
+io.opentelemetry.auto.exporters.zipkin.ZipkinExporterFactory

auto-exporters/zipkin/zipkin.gradle

@@ -0,0 +1,17 @@
+plugins {
+  id "com.github.johnrengelman.shadow"
+}
+
+apply from: "${rootDir}/gradle/java.gradle"
+
+dependencies {
+  compile(deps.opentelemetryZipkin) {
+    exclude group: 'io.opentelemetry', module: 'opentelemetry-sdk'
+  }
+  compileOnly deps.opentelemetrySdkAutoConfig
+  compile group: 'io.zipkin.reporter2', name: 'zipkin-sender-okhttp3', version: '2.12.2'
+}
+
+shadowJar {
+  archiveClassifier = ''
+}

gradle/dependencies.gradle

@@ -33,6 +33,7 @@ ext {
     opentelemetrySdkAutoConfig     : dependencies.create(group: 'io.opentelemetry', name: 'opentelemetry-sdk-contrib-auto-config', version: versions.opentelemetry),
     opentelemetryJaeger            : dependencies.create(group: 'io.opentelemetry', name: 'opentelemetry-exporters-jaeger', version: versions.opentelemetry),
     opentelemetryOtlp              : dependencies.create(group: 'io.opentelemetry', name: 'opentelemetry-exporters-otlp', version: versions.opentelemetry),
+    opentelemetryZipkin            : dependencies.create(group: 'io.opentelemetry', name: 'opentelemetry-exporters-zipkin', version: versions.opentelemetry),
 
     // General
     slf4j                          : "org.slf4j:slf4j-api:${versions.slf4j}",

settings.gradle

@@ -152,6 +152,7 @@ include ":auto-exporters"
 include ":auto-exporters:jaeger"
 include ":auto-exporters:logging"
 include ":auto-exporters:otlp"
+include ":auto-exporters:zipkin"
 
 // benchmark
 include ':benchmark'
@@ -174,3 +175,4 @@ project(':java-agent').name = 'opentelemetry-auto'
 project(':auto-exporters:jaeger').name = 'opentelemetry-auto-exporters-jaeger'
 project(':auto-exporters:logging').name = 'opentelemetry-auto-exporters-logging'
 project(':auto-exporters:otlp').name = 'opentelemetry-auto-exporters-otlp'
+project(':auto-exporters:zipkin').name = 'opentelemetry-auto-exporters-zipkin'