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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.rpc.filter;
import org.apache.dubbo.common.beanutil.JavaBeanAccessor;
import org.apache.dubbo.common.beanutil.JavaBeanDescriptor;
import org.apache.dubbo.common.beanutil.JavaBeanSerializeUtil;
import org.apache.dubbo.common.constants.CommonConstants;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.PojoUtils;
import org.apache.dubbo.common.utils.ReflectUtils;
import org.apache.dubbo.rpc.Constants;
import org.apache.dubbo.rpc.Filter;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Result;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.RpcInvocation;
import org.apache.dubbo.rpc.service.GenericService;
import org.apache.dubbo.rpc.support.ProtocolUtils;
import org.apache.dubbo.rpc.support.RpcUtils;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import static org.apache.dubbo.common.constants.CommonConstants.$INVOKE;
import static org.apache.dubbo.common.constants.CommonConstants.$INVOKE_ASYNC;
import static org.apache.dubbo.common.constants.CommonConstants.GENERIC_PARAMETER_DESC;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.COMMON_FAILED_REFLECT;
import static org.apache.dubbo.rpc.Constants.GENERIC_KEY;
/**
* GenericImplInvokerFilter
*/
@Activate(group = CommonConstants.CONSUMER, value = GENERIC_KEY, order = 20000)
public class GenericImplFilter implements Filter, Filter.Listener {
private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(GenericImplFilter.class);
private static final Class[] GENERIC_PARAMETER_TYPES = new Class[]{String.class, String[].class, Object[].class};
private static final String GENERIC_IMPL_MARKER = "GENERIC_IMPL";
@Override
public Result invoke(Invoker invoker, Invocation invocation) throws RpcException {
String generic = invoker.getUrl().getParameter(GENERIC_KEY);
// calling a generic impl service
if (isCallingGenericImpl(generic, invocation)) {
RpcInvocation invocation2 = new RpcInvocation(invocation);
/**
* Mark this invocation as a generic impl call, this value will be removed automatically before passing on the wire.
* See {@link RpcUtils#sieveUnnecessaryAttachments(Invocation)}
*/
invocation2.put(GENERIC_IMPL_MARKER, true);
String methodName = invocation2.getMethodName();
Class[] parameterTypes = invocation2.getParameterTypes();
Object[] arguments = invocation2.getArguments();
String[] types = new String[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
types[i] = ReflectUtils.getName(parameterTypes[i]);
}
Object[] args;
if (ProtocolUtils.isBeanGenericSerialization(generic)) {
args = new Object[arguments.length];
for (int i = 0; i < arguments.length; i++) {
args[i] = JavaBeanSerializeUtil.serialize(arguments[i], JavaBeanAccessor.METHOD);
}
} else {
args = PojoUtils.generalize(arguments);
}
if (RpcUtils.isReturnTypeFuture(invocation)) {
invocation2.setMethodName($INVOKE_ASYNC);
} else {
invocation2.setMethodName($INVOKE);
}
invocation2.setParameterTypes(GENERIC_PARAMETER_TYPES);
invocation2.setParameterTypesDesc(GENERIC_PARAMETER_DESC);
invocation2.setArguments(new Object[]{methodName, types, args});
return invoker.invoke(invocation2);
}
// making a generic call to a normal service
else if (isMakingGenericCall(generic, invocation)) {
Object[] args = (Object[]) invocation.getArguments()[2];
if (ProtocolUtils.isJavaGenericSerialization(generic)) {
for (Object arg : args) {
if (byte[].class != arg.getClass()) {
error(generic, byte[].class.getName(), arg.getClass().getName());
}
}
} else if (ProtocolUtils.isBeanGenericSerialization(generic)) {
for (Object arg : args) {
if (!(arg instanceof JavaBeanDescriptor)) {
error(generic, JavaBeanDescriptor.class.getName(), arg.getClass().getName());
}
}
}
invocation.setAttachment(
GENERIC_KEY, invoker.getUrl().getParameter(GENERIC_KEY));
}
return invoker.invoke(invocation);
}
private void error(String generic, String expected, String actual) throws RpcException {
throw new RpcException("Generic serialization [" + generic + "] only support message type " + expected + " and your message type is " + actual);
}
@Override
public void onResponse(Result appResponse, Invoker invoker, Invocation invocation) {
String generic = invoker.getUrl().getParameter(GENERIC_KEY);
String methodName = invocation.getMethodName();
Class[] parameterTypes = invocation.getParameterTypes();
Object genericImplMarker = invocation.get(GENERIC_IMPL_MARKER);
if (genericImplMarker != null && (boolean) invocation.get(GENERIC_IMPL_MARKER)) {
if (!appResponse.hasException()) {
Object value = appResponse.getValue();
try {
Class invokerInterface = invoker.getInterface();
if (!$INVOKE.equals(methodName) && !$INVOKE_ASYNC.equals(methodName)
&& invokerInterface.isAssignableFrom(GenericService.class)) {
try {
// find the real interface from url
String realInterface = invoker.getUrl().getParameter(Constants.INTERFACE);
invokerInterface = ReflectUtils.forName(realInterface);
} catch (Throwable e) {
// ignore
}
}
Method method = invokerInterface.getMethod(methodName, parameterTypes);
if (ProtocolUtils.isBeanGenericSerialization(generic)) {
if (value == null) {
appResponse.setValue(value);
} else if (value instanceof JavaBeanDescriptor) {
appResponse.setValue(JavaBeanSerializeUtil.deserialize((JavaBeanDescriptor) value));
} else {
throw new RpcException("The type of result value is " + value.getClass().getName() + " other than " + JavaBeanDescriptor.class.getName() + ", and the result is " + value);
}
} else {
Type[] types = ReflectUtils.getReturnTypes(method);
appResponse.setValue(PojoUtils.realize(value, (Class) types[0], types[1]));
}
} catch (NoSuchMethodException e) {
throw new RpcException(e.getMessage(), e);
}
} else if (appResponse.getException() instanceof com.alibaba.dubbo.rpc.service.GenericException) {
com.alibaba.dubbo.rpc.service.GenericException exception = (com.alibaba.dubbo.rpc.service.GenericException) appResponse.getException();
try {
String className = exception.getExceptionClass();
Class clazz = ReflectUtils.forName(className);
Throwable targetException = null;
Throwable lastException = null;
try {
targetException = (Throwable) clazz.newInstance();
} catch (Throwable e) {
lastException = e;
for (Constructor constructor : clazz.getConstructors()) {
try {
targetException = (Throwable) constructor.newInstance(new Object[constructor.getParameterTypes().length]);
break;
} catch (Throwable e1) {
lastException = e1;
}
}
}
if (targetException != null) {
try {
Field field = Throwable.class.getDeclaredField("detailMessage");
if (!field.isAccessible()) {
field.setAccessible(true);
}
field.set(targetException, exception.getExceptionMessage());
} catch (Throwable e) {
logger.warn(COMMON_FAILED_REFLECT, "", "", e.getMessage(), e);
}
appResponse.setException(targetException);
} else if (lastException != null) {
throw lastException;
}
} catch (Throwable e) {
throw new RpcException("Can not deserialize exception " + exception.getExceptionClass() + ", message: " + exception.getExceptionMessage(), e);
}
}
}
}
@Override
public void onError(Throwable t, Invoker invoker, Invocation invocation) {
}
private boolean isCallingGenericImpl(String generic, Invocation invocation) {
return ProtocolUtils.isGeneric(generic)
&& (!$INVOKE.equals(invocation.getMethodName()) && !$INVOKE_ASYNC.equals(invocation.getMethodName()))
&& invocation instanceof RpcInvocation;
}
private boolean isMakingGenericCall(String generic, Invocation invocation) {
return (invocation.getMethodName().equals($INVOKE) || invocation.getMethodName().equals($INVOKE_ASYNC))
&& invocation.getArguments() != null
&& invocation.getArguments().length == 3
&& ProtocolUtils.isGeneric(generic);
}
}