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76 changes: 76 additions & 0 deletions
76
...ntelemetry/javaagent/instrumentation/internal/classloader/DefineClassInstrumentation.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| /* | ||
| * Copyright The OpenTelemetry Authors | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
|
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| package io.opentelemetry.javaagent.instrumentation.internal.classloader; | ||
|
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| import static net.bytebuddy.matcher.ElementMatchers.named; | ||
| import static net.bytebuddy.matcher.ElementMatchers.takesArguments; | ||
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| import io.opentelemetry.javaagent.bootstrap.DefineClassHelper; | ||
| import io.opentelemetry.javaagent.bootstrap.DefineClassHelper.Handler.DefineClassContext; | ||
| import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation; | ||
| import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer; | ||
| import java.nio.ByteBuffer; | ||
| import java.security.ProtectionDomain; | ||
| import net.bytebuddy.asm.Advice; | ||
| import net.bytebuddy.description.type.TypeDescription; | ||
| import net.bytebuddy.matcher.ElementMatcher; | ||
|
|
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| public class DefineClassInstrumentation implements TypeInstrumentation { | ||
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| @Override | ||
| public ElementMatcher<TypeDescription> typeMatcher() { | ||
| return named("java.lang.ClassLoader"); | ||
| } | ||
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| @Override | ||
| public void transform(TypeTransformer transformer) { | ||
| transformer.applyAdviceToMethod( | ||
| named("defineClass") | ||
| .and( | ||
| takesArguments( | ||
| String.class, byte[].class, int.class, int.class, ProtectionDomain.class)), | ||
| DefineClassInstrumentation.class.getName() + "$DefineClassAdvice"); | ||
| transformer.applyAdviceToMethod( | ||
| named("defineClass") | ||
| .and(takesArguments(String.class, ByteBuffer.class, ProtectionDomain.class)), | ||
| DefineClassInstrumentation.class.getName() + "$DefineClassAdvice2"); | ||
| } | ||
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| @SuppressWarnings("unused") | ||
| public static class DefineClassAdvice { | ||
| @Advice.OnMethodEnter(suppress = Throwable.class) | ||
| public static DefineClassContext onEnter( | ||
| @Advice.This ClassLoader classLoader, | ||
| @Advice.Argument(0) String className, | ||
| @Advice.Argument(1) byte[] classBytes, | ||
| @Advice.Argument(2) int offset, | ||
| @Advice.Argument(3) int length) { | ||
| return DefineClassHelper.beforeDefineClass( | ||
| classLoader, className, classBytes, offset, length); | ||
| } | ||
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| @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class) | ||
| public static void onExit(@Advice.Enter DefineClassContext context) { | ||
| DefineClassHelper.afterDefineClass(context); | ||
| } | ||
| } | ||
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| @SuppressWarnings("unused") | ||
| public static class DefineClassAdvice2 { | ||
| @Advice.OnMethodEnter(suppress = Throwable.class) | ||
| public static DefineClassContext onEnter( | ||
| @Advice.This ClassLoader classLoader, | ||
| @Advice.Argument(0) String className, | ||
| @Advice.Argument(1) ByteBuffer classBytes) { | ||
| return DefineClassHelper.beforeDefineClass(classLoader, className, classBytes); | ||
| } | ||
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| @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class) | ||
| public static void onExit(@Advice.Enter DefineClassContext context) { | ||
| DefineClassHelper.afterDefineClass(context); | ||
| } | ||
| } | ||
| } |
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68 changes: 68 additions & 0 deletions
68
...agent-bootstrap/src/main/java/io/opentelemetry/javaagent/bootstrap/DefineClassHelper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| /* | ||
| * Copyright The OpenTelemetry Authors | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
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| package io.opentelemetry.javaagent.bootstrap; | ||
|
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| import java.nio.ByteBuffer; | ||
|
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| public class DefineClassHelper { | ||
|
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| /** Helper class for {@code ClassLoader.defineClass} callbacks. */ | ||
| public interface Handler { | ||
| DefineClassContext beforeDefineClass( | ||
| ClassLoader classLoader, String className, byte[] classBytes, int offset, int length); | ||
|
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| void afterDefineClass(DefineClassContext context); | ||
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| /** Context returned from {@code beforeDefineClass} and passed to {@code afterDefineClass}. */ | ||
| interface DefineClassContext { | ||
| void exit(); | ||
| } | ||
| } | ||
|
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| private static volatile Handler handler; | ||
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| public static Handler.DefineClassContext beforeDefineClass( | ||
| ClassLoader classLoader, String className, byte[] classBytes, int offset, int length) { | ||
| return handler.beforeDefineClass(classLoader, className, classBytes, offset, length); | ||
| } | ||
|
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| public static Handler.DefineClassContext beforeDefineClass( | ||
| ClassLoader classLoader, String className, ByteBuffer byteBuffer) { | ||
| // see how ClassLoader handles ByteBuffer | ||
| // https:/openjdk/jdk11u/blob/487c3344fee3502b4843e7e11acceb77ad16100c/src/java.base/share/classes/java/lang/ClassLoader.java#L1095 | ||
| int length = byteBuffer.remaining(); | ||
| if (byteBuffer.hasArray()) { | ||
| return beforeDefineClass( | ||
| classLoader, | ||
| className, | ||
| byteBuffer.array(), | ||
| byteBuffer.position() + byteBuffer.arrayOffset(), | ||
| length); | ||
| } else { | ||
| byte[] classBytes = new byte[length]; | ||
| byteBuffer.duplicate().get(classBytes); | ||
| return beforeDefineClass(classLoader, className, classBytes, 0, length); | ||
| } | ||
| } | ||
|
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| public static void afterDefineClass(Handler.DefineClassContext context) { | ||
| handler.afterDefineClass(context); | ||
| } | ||
|
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| /** | ||
| * Sets the {@link Handler} with callbacks to execute when {@code ClassLoader.defineClass} is | ||
| * called. | ||
| */ | ||
| public static void internalSetHandler(Handler handler) { | ||
| if (DefineClassHelper.handler != null) { | ||
| // Only possible by misuse of this API, just ignore. | ||
| return; | ||
| } | ||
| DefineClassHelper.handler = handler; | ||
| } | ||
|
|
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| private DefineClassHelper() {} | ||
| } |
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