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scouter.agent.asm.asyncsupport.AsyncContextDispatchASM Maven / Gradle / Ivy
/*
* Copyright 2015 the original author or authors.
* @https://github.com/scouter-project/scouter
*
* 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 scouter.agent.asm.asyncsupport;
import scouter.org.objectweb.asm.ClassVisitor;
import scouter.org.objectweb.asm.MethodVisitor;
import scouter.org.objectweb.asm.Opcodes;
import scouter.org.objectweb.asm.commons.LocalVariablesSorter;
import scouter.agent.ClassDesc;
import scouter.agent.Configure;
import scouter.agent.asm.IASM;
import scouter.agent.asm.util.AsmUtil;
import scouter.agent.asm.util.HookingSet;
import scouter.agent.trace.TraceMain;
import java.util.ArrayList;
import java.util.List;
import static scouter.agent.asm.asyncsupport.AsyncContextDispatchASM.ON_COMPLETE_SELF_DISPATCH_METHOD;
/**
* @author Gun Lee ([email protected] ) on 2017. 2. 24.
*/
public class AsyncContextDispatchASM implements IASM, Opcodes {
private static List preservedAsyncContextDispatchPatterns = new ArrayList();
public final static String ON_COMPLETE_SELF_DISPATCH_METHOD = "dispatch()V";
static {
preservedAsyncContextDispatchPatterns.add("org.apache.catalina.core.AsyncContextImpl.dispatch(Ljavax/servlet/ServletContext;Ljava/lang/String;)V");
}
private Configure conf = Configure.getInstance();
private List dispatchTarget;
public AsyncContextDispatchASM() {
dispatchTarget = HookingSet.getHookingMethodSet(HookingSet.buildPatterns(conf.hook_async_context_dispatch_patterns, preservedAsyncContextDispatchPatterns));
}
public ClassVisitor transform(ClassVisitor cv, String className, ClassDesc classDesc) {
if (conf.hook_async_servlet_enabled == false) {
return cv;
}
for (int i = 0; i < dispatchTarget.size(); i++) {
HookingSet mset = dispatchTarget.get(i);
if (mset.classMatch.include(className)) {
return new AsyncContextCV(cv, mset, className);
}
}
return cv;
}
}
class AsyncContextCV extends ClassVisitor implements Opcodes {
String className;
HookingSet mset;
public AsyncContextCV(ClassVisitor cv, HookingSet mset, String className) {
super(ASM5, cv);
this.mset = mset;
this.className = className;
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
if (mv == null || mset.isA(name, desc) == false) {
if(!ON_COMPLETE_SELF_DISPATCH_METHOD.equals(name + desc)) {
return mv;
}
}
if (AsmUtil.isSpecial(name)) {
return mv;
}
return new DispatchMV(access, name, desc, mv);
}
}
class DispatchMV extends LocalVariablesSorter implements Opcodes {
private static final String TRACEMAIN = TraceMain.class.getName().replace('.', '/');
private static final String START_METHOD = "dispatchAsyncServlet";
private static final String START_SIGNATURE = "(Ljava/lang/Object;Ljava/lang/String;)V";
private static final String SELF_DISPATCH_METHOD = "selfDispatchAsyncServlet";
private static final String SELF_DISPATCH_SIGNATURE = "(Ljava/lang/Object;)V";
String name;
String desc;
public DispatchMV(int access, String name, String desc, MethodVisitor mv) {
super(ASM5, access, desc, mv);
this.name = name;
this.desc = desc;
}
@Override
public void visitCode() {
if (ON_COMPLETE_SELF_DISPATCH_METHOD.equals(name+desc)) {
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, SELF_DISPATCH_METHOD, SELF_DISPATCH_SIGNATURE, false);
} else {
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, START_METHOD, START_SIGNATURE, false);
}
mv.visitCode();
}
}