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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package com.ericsson.testvnf.server.netconf;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.StringReader;
import java.util.Map;
import java.util.stream.Stream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;
import com.ericsson.testvnf.server.helper.ActionHelper;
import com.ericsson.testvnf.server.helper.CustomParser;
import com.ericsson.testvnf.server.models.Hello;
import com.ericsson.testvnf.server.models.NetconfMessage;
import com.ericsson.testvnf.server.models.RpcData;
import com.ericsson.testvnf.server.requestqueue.RequestQueueHandler;
/*
* NetconfHandler class which handles the netconf communication with a client
*/
public class NetconfHandler implements Runnable {
private InputStream in;
private Map<String, Boolean> connectionResetMap;
private XMLReader xmlReader;
private boolean sessionClosed;
private RequestQueueHandler requestQueueHandler;
private ActionHelper actionHelper;
private Thread requestHandlerThread;
private static final Log log = LogFactory.getLog(NetconfHandler.class);
public NetconfHandler(InputStream in, OutputStream out, Map<String, Boolean> connectionResetMap) {
this.connectionResetMap = connectionResetMap;
this.in = in;
actionHelper = new ActionHelper(out);
this.sessionClosed = false;
}
public void run() {
// initialize rpc request handler and request queue
try {
requestQueueHandler = new RequestQueueHandler();
CustomParser customParser = new CustomParser();
customParser.setRequestQueueHandler(requestQueueHandler); // input requests once processed are added to the request queue.
xmlReader = XMLReaderFactory.createXMLReader();
xmlReader.setContentHandler(customParser);
xmlReader.setErrorHandler(customParser);
} catch (SAXException e) {
log.error("Error creating custom rpc request parser.", e);
return;
}
actionHelper.sendHelloMessage(); // server sends hello to the client as soon as the client initiates a connection with the server
startRequestHandler();
// start and wait for request handler
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
log.warn("Error waiting for thread.", e);
}
readInputRequest();
}
// read input requests from the client
private void readInputRequest(){
StringBuilder netconfMessage = new StringBuilder();
try (BufferedReader br = new BufferedReader(new InputStreamReader(in));
Stream<String> lineStream = br.lines();){
log.info("Parsing message.");
// rpc requests from clients are parsed and processed
lineStream.forEach(ele -> {
ele = ele.trim();
log.info("current element::" + ele);
if (ele.contains("]]>]]>")) {
ele = ele.replace("]]>]]>", "");
}
if (ele.contains("</hello>") || ele.contains("</rpc>")) {
netconfMessage.append(ele + '\n');
String messageAsString = netconfMessage.toString();
try {
log.info("Parsing message---:\n" + messageAsString);
xmlReader.parse(new InputSource(new StringReader(messageAsString.trim()))); //xmlParser parses the rpc requests
log.info("Parsing done..");
} catch (Exception e) {
log.error("Error parsing. Message---: \n" + messageAsString, e);
sessionClosed = true;
}
netconfMessage.setLength(0);// reset the message as one whole request is complete
}else {
netconfMessage.append(ele + '\n');
}
});
} catch (Exception e) {
log.error("Exception caught in NetconfHandler readInputRequest: "+ e.getMessage());
} finally {
interruptThreads();
}
}
// method that performs actions based on the message coming in from the client
private void startRequestHandler() {
log.info("start RequestHandler.");
requestHandlerThread = new Thread("Request handler") {
@Override
public void run() {
while (!sessionClosed) {
NetconfMessage netconfMessage = null;
try {
netconfMessage = requestQueueHandler.waitAndGetMessageFromQueue(); // get the message received
} catch (InterruptedException e) {
log.warn("Interrupted exception");
Thread.currentThread().interrupt();
break;
}
if (netconfMessage instanceof Hello) { // if client sends a hello, send a hello message back
actionHelper.sendHelloMessage();
} else if (netconfMessage instanceof RpcData) {
sessionClosed = actionHelper.doActionForRPCRequest(netconfMessage, connectionResetMap, sessionClosed);
}else {
log.warn("Unknown message received.");
}
}
log.info("Request handler ended");
}
};
requestHandlerThread.start();
log.info("Request handler thread started.");
}
public void interruptThreads() {
actionHelper.interruptGroovyCallerThread();
if (requestHandlerThread!=null && requestHandlerThread.isAlive()) {
log.info("Killing request handler thread");
requestHandlerThread.interrupt();
}
}
}
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