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scouter.agent.asm.asyncsupport.HystrixCommandASM 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.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 scouter.org.objectweb.asm.ClassVisitor;
import scouter.org.objectweb.asm.Label;
import scouter.org.objectweb.asm.MethodVisitor;
import scouter.org.objectweb.asm.Opcodes;
import scouter.org.objectweb.asm.Type;
import scouter.org.objectweb.asm.commons.LocalVariablesSorter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @author Gun Lee ([email protected] ) on 2017. 2. 21.
*/
public class HystrixCommandASM implements IASM, Opcodes {
private Configure conf = Configure.getInstance();
private List prepareTarget = HookingSet.getHookingMethodSet("");
private List receiveTarget = HookingSet.getHookingMethodSet("");
private Map prepareReserved = new HashMap();
private Map receiveReserved = new HashMap();
public HystrixCommandASM() {
if(true) {
AsmUtil.add(prepareReserved, "com/netflix/hystrix/HystrixCommand", "execute()Ljava/lang/Object;");
}
if(true) {
AsmUtil.add(receiveReserved, "com/netflix/hystrix/contrib/javanica/command/GenericCommand", "run()Ljava/lang/Object;");
}
}
public ClassVisitor transform(ClassVisitor cv, String className, ClassDesc classDesc) {
HookingSet mset = prepareReserved.get(className);
if (mset != null){
return new HystrixCommandPrepareCV(cv, mset, className);
}
mset = receiveReserved.get(className);
if (mset != null){
return new HystrixCommandReceiveCV(cv, mset, className);
}
return cv;
}
}
class HystrixCommandPrepareCV extends ClassVisitor implements Opcodes {
String className;
private HookingSet mset;
public HystrixCommandPrepareCV(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) {
return mv;
}
if (AsmUtil.isSpecial(name)) {
return mv;
}
return new HystrixCommandPrepareMV(access, name, desc, mv);
}
}
class HystrixCommandReceiveCV extends ClassVisitor implements Opcodes {
String className;
private HookingSet mset;
public HystrixCommandReceiveCV(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) {
return mv;
}
if (AsmUtil.isSpecial(name)) {
return mv;
}
return new HystrixCommandReceiveMV(access, name, desc, mv);
}
}
class HystrixCommandReceiveMV extends LocalVariablesSorter implements Opcodes {
private static final String TARGET = TraceMain.class.getName().replace('.', '/');
private static final String START_METHOD = "callRunnableCallInvoked";
private static final String START_SIGNATURE = "(Ljava/lang/Object;)Ljava/lang/Object;";
private static final String END_METHOD = "callRunnableCallEnd";
private static final String END_METHOD_DESC = "(" +
"Ljava/lang/Object;" +
"Ljava/lang/Object;" +
"Ljava/lang/Throwable;" +
")V";
private Label startFinally = new Label();
private Type returnType;
String name;
String desc;
private int statIdx;
public HystrixCommandReceiveMV(int access, String name, String desc, MethodVisitor mv) {
super(ASM5, access, desc, mv);
this.name = name;
this.desc = desc;
this.returnType = Type.getReturnType(desc);
}
@Override
public void visitCode() {
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, START_METHOD, START_SIGNATURE, false);
statIdx = newLocal(Type.getType(Object.class));
mv.visitVarInsn(Opcodes.ASTORE, statIdx);
mv.visitLabel(startFinally);
mv.visitCode();
}
@Override
public void visitInsn(int opcode) {
if ((opcode >= IRETURN && opcode <= RETURN)) {
capReturn();
}
mv.visitInsn(opcode);
}
private void capReturn() {
Type tp = returnType;
if (tp == null || tp.equals(Type.VOID_TYPE)) {
mv.visitInsn(Opcodes.ACONST_NULL);
mv.visitVarInsn(Opcodes.ALOAD, statIdx);
mv.visitInsn(Opcodes.ACONST_NULL);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, END_METHOD, END_METHOD_DESC, false);
return;
}
switch (tp.getSort()) {
case Type.DOUBLE:
case Type.LONG:
mv.visitInsn(Opcodes.DUP2);
break;
default:
mv.visitInsn(Opcodes.DUP);
}
// TODO method return test dup and store
// int rtnIdx = newLocal(tp);
// mv.visitVarInsn(Opcodes.ASTORE, rtnIdx);
// mv.visitVarInsn(Opcodes.ALOAD, rtnIdx);
mv.visitVarInsn(Opcodes.ALOAD, statIdx);// stat
mv.visitInsn(Opcodes.ACONST_NULL);// throwable
mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, END_METHOD, END_METHOD_DESC, false);
}
@Override
public void visitMaxs(int maxStack, int maxLocals) {
Label endFinally = new Label();
mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
mv.visitLabel(endFinally);
mv.visitInsn(DUP);
int errIdx = newLocal(Type.getType(Throwable.class));
mv.visitVarInsn(Opcodes.ASTORE, errIdx);
mv.visitInsn(Opcodes.ACONST_NULL);// return
mv.visitVarInsn(Opcodes.ALOAD, statIdx);
mv.visitVarInsn(Opcodes.ALOAD, errIdx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, END_METHOD, END_METHOD_DESC,false);
mv.visitInsn(ATHROW);
mv.visitMaxs(maxStack + 8, maxLocals + 2);
}
}
class HystrixCommandPrepareMV extends LocalVariablesSorter implements Opcodes {
private static final String TARGET = TraceMain.class.getName().replace('.', '/');
private static final String START_METHOD = "hystrixPrepareInvoked";
private static final String START_SIGNATURE = "(Ljava/lang/Object;)V";
String name;
String desc;
public HystrixCommandPrepareMV(int access, String name, String desc, MethodVisitor mv) {
super(ASM5, access, desc, mv);
this.name = name;
this.desc = desc;
}
@Override
public void visitCode() {
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, START_METHOD, START_SIGNATURE, false);
mv.visitCode();
}
}
