/**
* 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.hadoop.oncrpc;
import java.util.Arrays;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.oncrpc.RpcAcceptedReply.AcceptState;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.MessageEvent;
/**
* A simple client that registers an RPC program with portmap.
*/
public class RegistrationClient extends SimpleTcpClient {
public static final Log LOG = LogFactory.getLog(RegistrationClient.class);
public RegistrationClient(String host, int port, XDR request) {
super(host, port, request);
}
/**
* Handler to handle response from the server.
*/
static class RegistrationClientHandler extends SimpleTcpClientHandler {
public RegistrationClientHandler(XDR request) {
super(request);
}
private boolean validMessageLength(int len) {
// 28 bytes is the minimal success response size (portmapV2)
if (len < 28) {
if (LOG.isDebugEnabled()) {
LOG.debug("Portmap mapping registration failed,"
+ " the response size is less than 28 bytes:" + len);
}
return false;
}
return true;
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
ChannelBuffer buf = (ChannelBuffer) e.getMessage(); // Read reply
if (!validMessageLength(buf.readableBytes())) {
e.getChannel().close();
return;
}
// handling fragment header for TCP, 4 bytes.
byte[] fragmentHeader = Arrays.copyOfRange(buf.array(), 0, 4);
int fragmentSize = XDR.fragmentSize(fragmentHeader);
boolean isLast = XDR.isLastFragment(fragmentHeader);
assert (fragmentSize == 28 && isLast == true);
XDR xdr = new XDR();
xdr.writeFixedOpaque(Arrays.copyOfRange(buf.array(), 4,
buf.readableBytes()));
RpcReply reply = RpcReply.read(xdr);
if (reply.getState() == RpcReply.ReplyState.MSG_ACCEPTED) {
RpcAcceptedReply acceptedReply = (RpcAcceptedReply) reply;
handle(acceptedReply, xdr);
} else {
RpcDeniedReply deniedReply = (RpcDeniedReply) reply;
handle(deniedReply);
}
e.getChannel().close(); // shutdown now that request is complete
}
private void handle(RpcDeniedReply deniedReply) {
LOG.warn("Portmap mapping registration request was denied , " +
deniedReply);
}
private void handle(RpcAcceptedReply acceptedReply, XDR xdr) {
AcceptState acceptState = acceptedReply.getAcceptState();
assert (acceptState == AcceptState.SUCCESS);
boolean answer = xdr.readBoolean();
if (answer != true) {
LOG.warn("Portmap mapping registration failed, accept state:"
+ acceptState);
}
LOG.info("Portmap mapping registration succeeded");
}
}
}