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| 1 | +/* |
| 2 | + * Copyright 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| 3 | + * |
| 4 | + * Modifications copyright (C) 2017 Uber Technologies, Inc. |
| 5 | + * |
| 6 | + * Licensed under the Apache License, Version 2.0 (the "License"). You may not |
| 7 | + * use this file except in compliance with the License. A copy of the License is |
| 8 | + * located at |
| 9 | + * |
| 10 | + * http://aws.amazon.com/apache2.0 |
| 11 | + * |
| 12 | + * or in the "license" file accompanying this file. This file is distributed on |
| 13 | + * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| 14 | + * express or implied. See the License for the specific language governing |
| 15 | + * permissions and limitations under the License. |
| 16 | + */ |
| 17 | + |
| 18 | +package com.uber.cadence.context; |
| 19 | + |
| 20 | +import io.opentracing.Span; |
| 21 | +import io.opentracing.SpanContext; |
| 22 | +import io.opentracing.Tracer; |
| 23 | +import io.opentracing.propagation.Format; |
| 24 | +import io.opentracing.propagation.TextMap; |
| 25 | +import io.opentracing.util.GlobalTracer; |
| 26 | +import java.nio.charset.Charset; |
| 27 | +import java.util.HashMap; |
| 28 | +import java.util.Iterator; |
| 29 | +import java.util.Map; |
| 30 | + |
| 31 | +/** Support for OpenTracing spans */ |
| 32 | +public class OpenTracingContextPropagator implements ContextPropagator { |
| 33 | + |
| 34 | + private static ThreadLocal<SpanContext> currentOpenTracingSpanContext = new ThreadLocal<>(); |
| 35 | + |
| 36 | + public static void setCurrentOpenTracingSpanContext(SpanContext ctx) { |
| 37 | + if (ctx != null) { |
| 38 | + currentOpenTracingSpanContext.set(ctx); |
| 39 | + } |
| 40 | + } |
| 41 | + |
| 42 | + public static SpanContext getCurrentOpenTracingSpanContext() { |
| 43 | + return currentOpenTracingSpanContext.get(); |
| 44 | + } |
| 45 | + |
| 46 | + @Override |
| 47 | + public String getName() { |
| 48 | + return "OpenTracing"; |
| 49 | + } |
| 50 | + |
| 51 | + @Override |
| 52 | + public Map<String, byte[]> serializeContext(Object context) { |
| 53 | + Map<String, byte[]> serializedContext = new HashMap<>(); |
| 54 | + Map<String, String> contextMap = (Map<String, String>) context; |
| 55 | + for (Map.Entry<String, String> entry : contextMap.entrySet()) { |
| 56 | + serializedContext.put(entry.getKey(), entry.getValue().getBytes(Charset.defaultCharset())); |
| 57 | + } |
| 58 | + return serializedContext; |
| 59 | + } |
| 60 | + |
| 61 | + @Override |
| 62 | + public Object deserializeContext(Map<String, byte[]> context) { |
| 63 | + Map<String, String> contextMap = new HashMap<>(); |
| 64 | + for (Map.Entry<String, byte[]> entry : context.entrySet()) { |
| 65 | + contextMap.put(entry.getKey(), new String(entry.getValue(), Charset.defaultCharset())); |
| 66 | + } |
| 67 | + return contextMap; |
| 68 | + } |
| 69 | + |
| 70 | + @Override |
| 71 | + public Object getCurrentContext() { |
| 72 | + Tracer currentTracer = GlobalTracer.get(); |
| 73 | + Span currentSpan = currentTracer.scopeManager().activeSpan(); |
| 74 | + if (currentSpan != null) { |
| 75 | + HashMapTextMap contextTextMap = new HashMapTextMap(); |
| 76 | + currentTracer.inject(currentSpan.context(), Format.Builtin.TEXT_MAP, contextTextMap); |
| 77 | + return contextTextMap.getBackingMap(); |
| 78 | + } else { |
| 79 | + return null; |
| 80 | + } |
| 81 | + } |
| 82 | + |
| 83 | + @Override |
| 84 | + public void setCurrentContext(Object context) { |
| 85 | + Tracer currentTracer = GlobalTracer.get(); |
| 86 | + Map<String, String> contextAsMap = (Map<String, String>) context; |
| 87 | + if (contextAsMap != null) { |
| 88 | + HashMapTextMap contextTextMap = new HashMapTextMap(contextAsMap); |
| 89 | + setCurrentOpenTracingSpanContext( |
| 90 | + currentTracer.extract(Format.Builtin.TEXT_MAP, contextTextMap)); |
| 91 | + } |
| 92 | + } |
| 93 | + |
| 94 | + private class HashMapTextMap implements TextMap { |
| 95 | + |
| 96 | + private final HashMap<String, String> backingMap = new HashMap<>(); |
| 97 | + |
| 98 | + public HashMapTextMap() { |
| 99 | + // Noop |
| 100 | + } |
| 101 | + |
| 102 | + public HashMapTextMap(Map<String, String> spanData) { |
| 103 | + backingMap.putAll(spanData); |
| 104 | + } |
| 105 | + |
| 106 | + @Override |
| 107 | + public Iterator<Map.Entry<String, String>> iterator() { |
| 108 | + return backingMap.entrySet().iterator(); |
| 109 | + } |
| 110 | + |
| 111 | + @Override |
| 112 | + public void put(String key, String value) { |
| 113 | + backingMap.put(key, value); |
| 114 | + } |
| 115 | + |
| 116 | + public HashMap<String, String> getBackingMap() { |
| 117 | + return backingMap; |
| 118 | + } |
| 119 | + } |
| 120 | +} |
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