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feat: replace current JS hack with an Java agent
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78 changes: 78 additions & 0 deletions
78
jvm/agent/src/main/java/io/gatling/js/JavaScriptLanguageHack.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| * Copyright 2011-2024 GatlingCorp (https://gatling.io) | ||
| * | ||
| * 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.gatling.js; | ||
|
|
||
| import static io.gatling.internal.asm.Opcodes.*; | ||
|
|
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| import io.gatling.internal.asm.*; | ||
| import io.gatling.internal.asm.ClassReader; | ||
| import io.gatling.internal.asm.ClassWriter; | ||
| import java.lang.instrument.ClassFileTransformer; | ||
| import java.lang.instrument.IllegalClassFormatException; | ||
| import java.lang.instrument.Instrumentation; | ||
| import java.security.ProtectionDomain; | ||
|
|
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| public class JavaScriptLanguageHack { | ||
| public static void premain(String args, Instrumentation instrumentation) { | ||
| instrumentation.addTransformer(new JavaScriptLanguageClassFileTransformer()); | ||
| try { | ||
| Class.forName("com.oracle.truffle.js.lang.JavaScriptLanguage"); | ||
| } catch (ClassNotFoundException e) { | ||
| throw new IllegalStateException( | ||
| "JavaScriptLanguage class file not found: GraalJS dependency is probably missing"); | ||
| } | ||
| } | ||
|
|
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| private static class JavaScriptLanguageClassFileTransformer implements ClassFileTransformer { | ||
| @Override | ||
| public byte[] transform( | ||
| ClassLoader loader, | ||
| String className, | ||
| Class<?> classBeingRedefined, | ||
| ProtectionDomain protectionDomain, | ||
| byte[] classfileBuffer) | ||
| throws IllegalClassFormatException { | ||
| if (!className.equals("com/oracle/truffle/js/lang/JavaScriptLanguage")) { | ||
| return null; | ||
| } | ||
| ClassReader reader = new ClassReader(classfileBuffer); | ||
| ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS); | ||
| reader.accept(new JavaScriptLanguageClassVisitor(writer), ClassReader.EXPAND_FRAMES); | ||
| return writer.toByteArray(); | ||
| } | ||
| } | ||
|
|
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| private static class JavaScriptLanguageClassVisitor extends ClassVisitor { | ||
| public JavaScriptLanguageClassVisitor(ClassVisitor cv) { | ||
| super(ASM9, cv); | ||
| } | ||
|
|
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| @Override | ||
| public void visitEnd() { | ||
| final var mv = | ||
| cv.visitMethod( | ||
| ACC_PROTECTED, "isThreadAccessAllowed", "(Ljava/lang/Thread;Z)Z", null, null); | ||
| mv.visitCode(); | ||
| mv.visitInsn(ICONST_1); | ||
| mv.visitInsn(IRETURN); | ||
| mv.visitMaxs(1, 2); | ||
| mv.visitEnd(); | ||
|
|
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| super.visitEnd(); | ||
| } | ||
| } | ||
| } |
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