AWS Propagation support

brave/src/main/java/brave/internal/HexCodec.java

@@ -7,7 +7,7 @@ public final class HexCodec {
    * Parses a 1 to 32 character lower-hex string with no prefix into an unsigned long, tossing any
    * bits higher than 64.
    */
-  public static long lowerHexToUnsignedLong(String lowerHex) {
+  public static long lowerHexToUnsignedLong(CharSequence lowerHex) {
     int length = lowerHex.length();
     if (length < 1 || length > 32) throw isntLowerHexLong(lowerHex);
 
@@ -19,9 +19,9 @@ public static long lowerHexToUnsignedLong(String lowerHex) {
 
   /**
    * Parses a 16 character lower-hex string with no prefix into an unsigned long, starting at the
-   * spe index.
+   * specified index.
    */
-  public static long lowerHexToUnsignedLong(String lowerHex, int index) {
+  public static long lowerHexToUnsignedLong(CharSequence lowerHex, int index) {
     long result = 0;
     for (int endIndex = Math.min(index + 16, lowerHex.length()); index < endIndex; index++) {
       char c = lowerHex.charAt(index);
@@ -37,7 +37,7 @@ public static long lowerHexToUnsignedLong(String lowerHex, int index) {
     return result;
   }
 
-  static NumberFormatException isntLowerHexLong(String lowerHex) {
+  static NumberFormatException isntLowerHexLong(CharSequence lowerHex) {
     throw new NumberFormatException(
         lowerHex + " should be a 1 to 32 character lower-hex string with no prefix");
   }
@@ -76,7 +76,7 @@ public static void writeHexLong(char[] data, int pos, long v) {
   static final char[] HEX_DIGITS =
       {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
 
-  static void writeHexByte(char[] data, int pos, byte b) {
+  public static void writeHexByte(char[] data, int pos, byte b) {
     data[pos + 0] = HEX_DIGITS[(b >> 4) & 0xf];
     data[pos + 1] = HEX_DIGITS[b & 0xf];
   }

instrumentation/benchmarks/pom.xml

@@ -130,6 +130,11 @@
       <artifactId>resteasy-undertow</artifactId>
       <version>${resteasy.version}</version>
     </dependency>
+    <dependency>
+      <groupId>io.zipkin.brave</groupId>
+      <artifactId>brave-propagation-aws</artifactId>
+      <version>${project.version}</version>
+    </dependency>
   </dependencies>
 
   <build>

instrumentation/benchmarks/src/main/java/brave/EndToEndBenchmarks.java

@@ -2,6 +2,7 @@
 
 import brave.http.HttpServerBenchmarks;
 import brave.okhttp3.TracingCallFactory;
+import brave.propagation.aws.AWSPropagation;
 import brave.sampler.Sampler;
 import brave.servlet.TracingFilter;
 import io.undertow.servlet.Servlets;
@@ -78,6 +79,15 @@ public Traced128() {
     }
   }
 
+  public static class TracedAWS extends ForwardingTracingFilter {
+    public TracedAWS() {
+      super(Tracing.newBuilder()
+          .propagationFactory(new AWSPropagation.Factory())
+          .spanReporter(Reporter.NOOP)
+          .build());
+    }
+  }
+
   @Override protected void init(DeploymentInfo servletBuilder) {
     servletBuilder.addFilter(new FilterInfo("Unsampled", Unsampled.class))
         .addFilterUrlMapping("Unsampled", "/unsampled", REQUEST)
@@ -88,6 +98,9 @@ public Traced128() {
         .addFilter(new FilterInfo("Traced128", Traced128.class))
         .addFilterUrlMapping("Traced128", "/traced128", REQUEST)
         .addFilterUrlMapping("Traced128", "/traced128/api", REQUEST)
+        .addFilter(new FilterInfo("TracedAWS", TracedAWS.class))
+        .addFilterUrlMapping("TracedAWS", "/tracedaws", REQUEST)
+        .addFilterUrlMapping("TracedAWS", "/tracedaws/api", REQUEST)
         .addServlets(Servlets.servlet("HelloServlet", HelloServlet.class).addMapping("/*"));
   }
 

instrumentation/benchmarks/src/main/java/brave/http/HttpServerBenchmarks.java

@@ -106,6 +106,18 @@ protected int initServer() throws ServletException {
         .execute().body().close();
   }
 
+  @Benchmark public void tracedawsServer_get() throws Exception {
+    get("/tracedaws");
+  }
+
+  @Benchmark public void tracedawsServer_get_resumeTrace() throws Exception {
+    client.newCall(new Request.Builder().url(baseUrl() + "/traced128")
+        .header("X-Amzn-Trace-Id",
+            "Root=1-67891233-abcdef012345678912345678;Parent=463ac35c9f6413ad;Sampled=1")
+        .build())
+        .execute().body().close();
+  }
+
   void get(String path) throws IOException {
     client.newCall(new Request.Builder().url(baseUrl() + path).build()).execute().body().close();
   }

instrumentation/benchmarks/src/main/java/brave/internal/PropagationBenchmarks.java

@@ -0,0 +1,96 @@
+/**
+ * Copyright 2015-2016 The OpenZipkin 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 brave.internal;
+
+import brave.propagation.Propagation;
+import brave.propagation.TraceContext;
+import brave.propagation.TraceContext.Extractor;
+import brave.propagation.TraceContext.Injector;
+import brave.propagation.TraceContextOrSamplingFlags;
+import brave.propagation.aws.AWSPropagation;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.RunnerException;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+@Measurement(iterations = 5, time = 1)
+@Warmup(iterations = 10, time = 1)
+@Fork(3)
+@BenchmarkMode(Mode.Throughput)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@State(Scope.Thread)
+public class PropagationBenchmarks {
+
+  static final Injector<Map<String, String>> b3Injector =
+      Propagation.B3_STRING.injector(Map::put);
+  static final Injector<Map<String, String>> awsInjector =
+      new AWSPropagation.Factory().create(Propagation.KeyFactory.STRING).injector(Map::put);
+  static final Extractor<Map<String, String>> b3Extractor =
+      Propagation.B3_STRING.extractor(Map::get);
+  static final Extractor<Map<String, String>> awsExtractor =
+      new AWSPropagation.Factory().create(Propagation.KeyFactory.STRING).extractor(Map::get);
+
+  static final TraceContext context = TraceContext.newBuilder()
+      .traceIdHigh(HexCodec.lowerHexToUnsignedLong("67891233abcdef01"))
+      .traceId(HexCodec.lowerHexToUnsignedLong("2345678912345678"))
+      .spanId(HexCodec.lowerHexToUnsignedLong("463ac35c9f6413ad"))
+      .sampled(true)
+      .build();
+
+  static final Map<String, String> incoming = new LinkedHashMap<String, String>() {
+    {
+      b3Injector.inject(context, this);
+      awsInjector.inject(context, this);
+    }
+  };
+
+  Map<String, String> carrier = new LinkedHashMap<>();
+
+  @Benchmark public void inject_b3() {
+    b3Injector.inject(context, carrier);
+  }
+
+  @Benchmark public void inject_aws() {
+    awsInjector.inject(context, carrier);
+  }
+
+  @Benchmark public TraceContextOrSamplingFlags extract_b3() {
+    return b3Extractor.extract(incoming);
+  }
+
+  @Benchmark public TraceContextOrSamplingFlags extract_aws() {
+    return awsExtractor.extract(incoming);
+  }
+
+  // Convenience main entry-point
+  public static void main(String[] args) throws RunnerException {
+    Options opt = new OptionsBuilder()
+        .include(".*" + PropagationBenchmarks.class.getSimpleName() + ".extract_aws")
+        .build();
+
+    new Runner(opt).run();
+  }
+}

pom.xml

@@ -100,6 +100,7 @@
     <module>brave-tests</module>
     <module>context</module>
     <module>instrumentation</module>
+    <module>propagation</module>
     <module>spring-beans</module>
     <module>archive/brave-core</module>
     <module>archive/brave-http</module>

propagation/aws/README.md

@@ -0,0 +1,45 @@
+# brave-propagation-aws
+This changes brave to use "x-amzn-trace-id" as opposed to "x-b3" prefixed headers to propagate trace
+context across processes.
+
+To enable this, configure `brave.Tracing` with `AWSPropagation.Factory` like so:
+
+```java
+tracing = Tracing.newBuilder()
+    .propagationFactory(new AWSPropagation.Factory())
+    ...
+    .build();
+```
+
+## Notes
+* This does not send spans to Amazon. If you want to do that, use [io.zipkin.aws:reporter-xray-udp](https://github.com/openzipkin/zipkin-aws).
+  * Unless you send spans to amazon, the impact is only which headers are used by Brave.
+* This neither depends on, nor coordinates with [com.amazonaws:aws-xray-recorder-sdk-core](http://docs.aws.amazon.com/xray/latest/devguide/xray-sdk-java.html).
+  * If you are using Amazon X-Ray SDK in the same app, Brave will not "see" those traces and visa versa.
+  * If you would like X-Ray SDK integration (such that traces are mutually visible), please raise an issue.
+* This implicitly switches Brave to use 128-bit trace IDS
+  * Internally, Amazon's root timestamp is encoded in the first 32-bits of the 128-bit trace ID.
+
+## Utilities
+There are a couple added utilities for parsing and generating an AWS trace ID string:
+
+* `AWSPropagation.traceIdString` - used to generate a formatted trace ID for correlation purposes.
+* `AWSPropagation.extract` - extracts a trace context from a string such as an environment variable.
+
+Ex to extract the trace ID from the built-in AWS Lambda variable
+```java
+extracted = AWSPropagation.extract(System.getenv("_X_AMZN_TRACE_ID"));
+```
+
+## Extra fields
+Amazon's trace ID format allows propagation of "extra" fields. For example, someone can add
+diagnostic variables by appending them to the trace header as discussed in the [ALB blog](https://aws.amazon.com/blogs/aws/application-performance-percentiles-and-request-tracing-for-aws-application-load-balancer/).
+
+Ex: the below header includes a custom field `CalledFrom=Foo`, which is non-standard, but will be
+propagated throughout the trace.
+```
+X-Amzn-Trace-Id: Root=1-58211399-36d228ad5d99923122bbe354;CalledFrom=Foo
+```
+
+Internally, this field is stored in `TraceContext.extra()`, which allows it to be carried from the
+point a trace context is extracted until where it is injected into an outgoing request or message.

propagation/aws/pom.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <parent>
+    <groupId>io.zipkin.brave</groupId>
+    <artifactId>brave-propagation-parent</artifactId>
+    <version>4.8.2-SNAPSHOT</version>
+  </parent>
+  <modelVersion>4.0.0</modelVersion>
+
+  <artifactId>brave-propagation-aws</artifactId>
+  <name>Brave Propagation: Amazon Web Services (AWS)</name>
+
+  <properties>
+    <main.basedir>${project.basedir}/../..</main.basedir>
+    <main.java.version>1.6</main.java.version>
+    <main.signature.artifact>java16</main.signature.artifact>
+  </properties>
+</project>