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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.cluster.filter.support;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.common.extension.ExtensionLoader;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.common.utils.NetUtils;
import org.apache.dubbo.rpc.AsyncRpcResult;
import org.apache.dubbo.rpc.Filter;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.InvokeMode;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.PenetrateAttachmentSelector;
import org.apache.dubbo.rpc.Result;
import org.apache.dubbo.rpc.RpcContext;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.RpcInvocation;
import org.apache.dubbo.rpc.TimeoutCountDown;
import org.apache.dubbo.rpc.cluster.filter.ClusterFilter;
import org.apache.dubbo.rpc.model.ApplicationModel;
import java.util.Map;
import java.util.Set;
import static org.apache.dubbo.common.constants.CommonConstants.CONSUMER;
import static org.apache.dubbo.common.constants.CommonConstants.REMOTE_APPLICATION_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.TIME_COUNTDOWN_KEY;
/**
* ConsumerContextFilter set current RpcContext with invoker,invocation, local host, remote host and port
* for consumer invoker.It does it to make the requires info available to execution thread's RpcContext.
*
* @see Filter
* @see RpcContext
*/
@Activate(group = CONSUMER, order = Integer.MIN_VALUE)
public class ConsumerContextFilter implements ClusterFilter, ClusterFilter.Listener {
private Set supportedSelectors;
public ConsumerContextFilter(ApplicationModel applicationModel) {
ExtensionLoader selectorExtensionLoader = applicationModel.getExtensionLoader(PenetrateAttachmentSelector.class);
supportedSelectors = selectorExtensionLoader.getSupportedExtensionInstances();
}
@Override
public Result invoke(Invoker invoker, Invocation invocation) throws RpcException {
RpcContext.RestoreServiceContext originServiceContext = RpcContext.storeServiceContext();
try {
RpcContext.getServiceContext()
.setInvoker(invoker)
.setInvocation(invocation)
.setLocalAddress(NetUtils.getLocalHost(), 0);
RpcContext context = RpcContext.getClientAttachment();
context.setAttachment(REMOTE_APPLICATION_KEY, invoker.getUrl().getApplication());
if (invocation instanceof RpcInvocation) {
((RpcInvocation) invocation).setInvoker(invoker);
}
if (CollectionUtils.isNotEmpty(supportedSelectors)) {
for (PenetrateAttachmentSelector supportedSelector : supportedSelectors) {
Map selected = supportedSelector.select();
if (CollectionUtils.isNotEmptyMap(selected)) {
((RpcInvocation) invocation).addObjectAttachments(selected);
}
}
} else {
((RpcInvocation) invocation).addObjectAttachments(RpcContext.getServerAttachment().getObjectAttachments());
}
Map contextAttachments = RpcContext.getClientAttachment().getObjectAttachments();
if (CollectionUtils.isNotEmptyMap(contextAttachments)) {
/**
* invocation.addAttachmentsIfAbsent(context){@link RpcInvocation#addAttachmentsIfAbsent(Map)}should not be used here,
* because the {@link RpcContext#setAttachment(String, String)} is passed in the Filter when the call is triggered
* by the built-in retry mechanism of the Dubbo. The attachment to update RpcContext will no longer work, which is
* a mistake in most cases (for example, through Filter to RpcContext output traceId and spanId and other information).
*/
((RpcInvocation) invocation).addObjectAttachments(contextAttachments);
}
// pass default timeout set by end user (ReferenceConfig)
Object countDown = context.getObjectAttachment(TIME_COUNTDOWN_KEY);
if (countDown != null) {
TimeoutCountDown timeoutCountDown = (TimeoutCountDown) countDown;
if (timeoutCountDown.isExpired()) {
return AsyncRpcResult.newDefaultAsyncResult(new RpcException(RpcException.TIMEOUT_TERMINATE,
"No time left for making the following call: " + invocation.getServiceName() + "."
+ invocation.getMethodName() + ", terminate directly."), invocation);
}
}
RpcContext.removeServerContext();
return invoker.invoke(invocation);
} finally {
RpcContext.restoreServiceContext(originServiceContext);
}
}
@Override
public void onResponse(Result appResponse, Invoker invoker, Invocation invocation) {
// pass attachments to result
RpcContext.getServerContext().setObjectAttachments(appResponse.getObjectAttachments());
removeContext(invocation);
}
@Override
public void onError(Throwable t, Invoker invoker, Invocation invocation) {
removeContext(invocation);
}
private void removeContext(Invocation invocation) {
RpcContext.removeClientAttachment();
if (invocation instanceof RpcInvocation) {
RpcInvocation rpcInvocation = (RpcInvocation) invocation;
if (rpcInvocation.getInvokeMode() != null) {
// clear service context if not in sync mode
if (rpcInvocation.getInvokeMode() == InvokeMode.ASYNC || rpcInvocation.getInvokeMode() == InvokeMode.FUTURE) {
RpcContext.removeServiceContext();
}
}
}
// server context must not be removed because user might use it on callback.
// So the clear of is delayed til the start of the next rpc call, see RpcContext.removeServerContext(); in invoke() above
// RpcContext.removeServerContext();
}
}