/*
* 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.nifi.processors.standard.relp.handler;
import org.apache.nifi.logging.ComponentLog;
import org.apache.nifi.processor.util.listen.dispatcher.AsyncChannelDispatcher;
import org.apache.nifi.processor.util.listen.event.Event;
import org.apache.nifi.processor.util.listen.event.EventFactory;
import org.apache.nifi.processor.util.listen.handler.socket.StandardSocketChannelHandler;
import org.apache.nifi.processor.util.listen.response.socket.SocketChannelResponder;
import org.apache.nifi.processors.standard.relp.frame.RELPDecoder;
import org.apache.nifi.processors.standard.relp.frame.RELPFrame;
import org.apache.nifi.processors.standard.relp.frame.RELPFrameException;
import java.io.IOException;
import java.net.InetAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.nio.charset.Charset;
import java.util.concurrent.BlockingQueue;
/**
* Extends the StandardSocketChannelHandler to decode bytes into RELP frames.
*/
public class RELPSocketChannelHandler<E extends Event<SocketChannel>> extends StandardSocketChannelHandler<E> {
private RELPDecoder decoder;
private RELPFrameHandler<E> frameHandler;
public RELPSocketChannelHandler(final SelectionKey key,
final AsyncChannelDispatcher dispatcher,
final Charset charset,
final EventFactory<E> eventFactory,
final BlockingQueue<E> events,
final ComponentLog logger) {
super(key, dispatcher, charset, eventFactory, events, logger);
this.decoder = new RELPDecoder(charset);
this.frameHandler = new RELPFrameHandler<>(key, charset, eventFactory, events, dispatcher, logger);
}
@Override
protected void processBuffer(final SocketChannel socketChannel, final ByteBuffer socketBuffer)
throws InterruptedException, IOException {
// get total bytes in buffer
final int total = socketBuffer.remaining();
final InetAddress sender = socketChannel.socket().getInetAddress();
try {
// go through the buffer parsing the RELP command
for (int i = 0; i < total; i++) {
byte currByte = socketBuffer.get();
// if we found the end of a frame, handle the frame and mark the buffer
if (decoder.process(currByte)) {
final RELPFrame frame = decoder.getFrame();
logger.debug("Received RELP frame with transaction {} and command {}",
new Object[] {frame.getTxnr(), frame.getCommand()});
final SocketChannelResponder responder = new SocketChannelResponder(socketChannel);
frameHandler.handle(frame, responder, sender.toString());
socketBuffer.mark();
}
}
logger.debug("Done processing buffer");
} catch (final RELPFrameException rfe) {
logger.error("Error reading RELP frames due to {}", new Object[] {rfe.getMessage()}, rfe);
// if an invalid frame or bad data was sent then the decoder will be left in a
// corrupted state, so lets close the connection and cause the client to re-establish
dispatcher.completeConnection(key);
}
}
// not used for anything in RELP since the decoder encapsulates the delimiter
@Override
public byte getDelimiter() {
return RELPFrame.DELIMITER;
}
}