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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.logserver.net;
import com.yahoo.io.Connection;
import com.yahoo.io.ReadLine;
import com.yahoo.log.InvalidLogFormatException;
import com.yahoo.log.LogLevel;
import com.yahoo.log.LogMessage;
import com.yahoo.logserver.LogDispatcher;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* TODO
* <UL>
* <LI> send invalid log messages to somewhere so they can be
* analyzed and errors can be corrected.
* </UL>
*
* @author Bjorn Borud
*/
public class LogConnection implements Connection {
private static final Logger log = Logger.getLogger(LogConnection.class.getName());
public static final int READBUFFER_SIZE = (32 * 1024);
// the set of active connections
private static final Set<LogConnection> activeConnections = new HashSet<>();
private final SocketChannel socket;
private final LogDispatcher dispatcher;
private final ByteBuffer readBuffer = ByteBuffer.allocateDirect(READBUFFER_SIZE);
// counters
private long totalBytesRead = 0;
public LogConnection(SocketChannel socket, LogDispatcher dispatcher) {
this.socket = socket;
this.dispatcher = dispatcher;
addToActiveSet(this);
}
/**
* Return a shallow copy of the set of active connections.
*
*/
public static Set<LogConnection> getActiveConnections () {
synchronized(activeConnections) {
return new HashSet<>(activeConnections);
}
}
/**
* @return Return total number of bytes read from connection
*/
public long getTotalBytesRead () {
return totalBytesRead;
}
/**
* Internal method for adding connection to the set
* of active connections.
*
* @param connection The connection to be added
*/
private static void addToActiveSet (LogConnection connection) {
synchronized(activeConnections) {
activeConnections.add(connection);
}
}
/**
* Internal method to remove connection from the set of
* active connections.
*
* @param connection The connection to remove
* @throws IllegalStateException if the connection does not
* exist in the set
*
*/
private static void removeFromActiveSet (LogConnection connection) {
synchronized(activeConnections) {
activeConnections.remove(connection);
}
}
public void connect () throws IOException {
throw new RuntimeException("connect() is not supposed to be called");
}
public void write () {
throw new UnsupportedOperationException();
}
public void read() throws IOException {
if (! readBuffer.hasRemaining()) {
try {
readBuffer.putChar(readBuffer.capacity() - 2, '\n');
readBuffer.flip();
String s = ReadLine.readLine(readBuffer);
if (s == null) {
return;
}
log.log(LogLevel.DEBUG, "Log message too long. Message from "
+ socket.socket().getInetAddress() + " exceeds "
+ readBuffer.capacity() + ". The message was: " + s);
LogMessage msg = LogMessage.parseNativeFormat(s);
dispatcher.handle(msg);
}
catch (InvalidLogFormatException e) {
log.log(LogLevel.DEBUG, "Invalid log message", e);
}
finally {
readBuffer.clear();
}
return;
}
int ret = socket.read(readBuffer);
if (ret == -1) {
close();
return;
}
if (ret == 0) {
if (log.isLoggable(Level.FINE)) {
log.log(LogLevel.DEBUG, "zero byte read occurred");
}
}
// update global counter
totalBytesRead += ret;
readBuffer.flip();
String s;
while ((s = ReadLine.readLine(readBuffer)) != null) {
try {
LogMessage msg = LogMessage.parseNativeFormat(s);
dispatcher.handle(msg);
}
catch (InvalidLogFormatException e) {
log.log(LogLevel.DEBUG, "Invalid log message", e);
}
}
}
public void close() throws IOException {
if (log.isLoggable(Level.FINE)) {
log.log(LogLevel.INFO, this + ": closing");
}
socket.close();
removeFromActiveSet(this);
}
public int selectOps() {
return SelectionKey.OP_READ;
}
public SocketChannel socketChannel() {
return socket;
}
}
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