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/*
* 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;
import scouter.agent.ClassDesc;
import scouter.agent.Configure;
import scouter.agent.trace.TraceApiCall;
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.HashSet;
import java.util.Set;
/**
* @author Gun Lee ([email protected]) on 2018. 3. 20.
*/
public class ApiCallResponseObjectASM implements IASM, Opcodes {
private Configure conf = Configure.getInstance();
private static Set hookingClasses = new HashSet();
static {
hookingClasses.add("org/apache/http/impl/execchain/HttpResponseProxy");
hookingClasses.add("org/apache/http/impl/client/CloseableHttpResponseProxy");
}
public ClassVisitor transform(ClassVisitor cv, String className, ClassDesc classDesc) {
if (conf._hook_apicall_enabled == false)
return cv;
if (hookingClasses.contains(className)) {
return new ApiCallResponseObjectCV(cv, className);
}
return cv;
}
}
class ApiCallResponseObjectCV extends ClassVisitor implements Opcodes {
String className;
public ApiCallResponseObjectCV(ClassVisitor cv, String className) {
super(ASM7, cv);
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) {
return null;
}
if ("".equals(name) && desc.startsWith("(Lorg/apache/http/HttpResponse;")) {
return new ApiCallResponseObjectInitMV(className, access, name, desc, mv);
}
return mv;
}
}
class ApiCallResponseObjectInitMV extends LocalVariablesSorter implements Opcodes {
private static final String TRACE = TraceApiCall.class.getName().replace('.', '/');
private static final String END_METHOD = "setCalleeToCtxInHttpClientResponse";
private static final String END_SIGNATURE = "(Ljava/lang/Object;Ljava/lang/Object;)V";
private String className;
private String name;
private String desc;
private int statIdx;
private Type returnType;
private Label startFinally = new Label();
public ApiCallResponseObjectInitMV(String className, int access, String name, String desc, MethodVisitor mv) {
super(ASM7, access, desc, mv);
this.className = className;
this.name = name;
this.desc = desc;
this.returnType = Type.getReturnType(desc);
}
@Override
public void visitInsn(int opcode) {
if ((opcode >= IRETURN && opcode <= RETURN)) {
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE, END_METHOD, END_SIGNATURE, false);
}
mv.visitInsn(opcode);
}
}
