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/*
This file is part of GNUnet.
Copyright (C) 2011, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
package org.gnunet.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.Pipe;
import java.nio.channels.SelectionKey;
import java.util.LinkedList;
/**
* Server the entry point class for every gnunet-java component providing services
* to other components.
*
* The configuration for the server (i.e. ports/interfaces) is loaded with the standard configuration system.
*
* Note that other processes can send signals to the service via a pipe, whose name has to be given in the
* environment variable GNUNET_OS_CONTROL_PIPE
*/
public abstract class Service extends Program {
private static final Logger logger = LoggerFactory
.getLogger(Service.class);
private Server s;
private String serviceName;
private RelativeTime idleTimeout;
private boolean requireFound;
private Pipe.SourceChannel sigpipeChannel;
public Service(String serviceName, RelativeTime idleTimeout, boolean requireFound) {
this.serviceName = serviceName;
this.idleTimeout = idleTimeout;
this.requireFound = requireFound;
}
/**
* Obtain the server used by a service. Note that the server must NOT
* be destroyed by the caller.
*
* @return handle to the server for this service, NULL if there is none
*/
public final Server getServer() {
return s;
}
/**
* Stop the service.
*/
public void stop() {
s.stopListening();
}
public void runHook() {
String ip4AddrList = getConfiguration().getValueString(serviceName, "ACCEPT_FROM").orNull();
String ip6AddrList = getConfiguration().getValueString(serviceName, "ACCEPT_FROM6").orNull();
int port = getConfiguration().getValueNumber(serviceName, "PORT").get().intValue();
LinkedList<SocketAddress> addrs = new LinkedList<SocketAddress>();
if (ip4AddrList != null) {
for (String ip4Addr : ip4AddrList.split("[;]")) {
InetAddress addr = Resolver.getInetAddressFromString(ip4Addr);
addrs.add(new InetSocketAddress(addr, port));
}
}
if (ip6AddrList != null) {
for (String ip6Addr : ip6AddrList.split("[;]")) {
InetAddress addr = Resolver.getInetAddressFromString(ip6Addr);
addrs.add(new InetSocketAddress(addr, port));
}
}
s = new Server(addrs, idleTimeout, requireFound);
String pipeName = System.getenv("GNUNET_OS_CONTROL_PIPE");
if (pipeName != null && !pipeName.isEmpty()) {
Scheduler.FilePipe p = Scheduler.openFilePipe(new File(pipeName));
Scheduler.TaskConfiguration t = new Scheduler.TaskConfiguration(RelativeTime.FOREVER,
new SigpipeTask());
t.addSelectEvent(p.getSource(), SelectionKey.OP_READ);
t.setLifeness(false);
t.schedule();
sigpipeChannel = p.getSource();
}
run();
}
private class SigpipeTask implements Scheduler.Task {
@Override
public void run(Scheduler.RunContext ctx) {
ByteBuffer b = ByteBuffer.allocate(1);
int n;
try {
n = sigpipeChannel.read(b);
} catch (IOException e) {
logger.error("error reading signal pipe", e);
return;
}
b.flip();
boolean stopped = false;
if (n == 1) {
byte sig = b.get();
// 15=sigterm
if (sig == 15) {
logger.info("service shutting down");
getServer().stopListening();
stopped = true;
}
}
if (!stopped) {
Scheduler.TaskConfiguration t = new Scheduler.TaskConfiguration(RelativeTime.FOREVER, this);
t.schedule();
} else {
try {
sigpipeChannel.close();
} catch (IOException e) {
logger.error("could not close sigpipe channel, quitting");
}
System.exit(2);
}
}
}
}
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