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/**
* ProxyClient: Ivy relay, first attempt, still in beta stage DO NOT USE
*
* @author Yannick Jestin
* @author <a href="http://www.tls.cena.fr/products/ivy/">http://www.tls.cena.fr/products/ivy/</a>
*
* (c) ENAC
*
* changelog:
* 1.2.14
* - remove the Thread.start() from the constructor, to avoid mulithread issues
* see * http://findbugs.sourceforge.net/bugDescriptions.html#SC_START_IN_CTOR
* now ,we have to call IvyClient.start() after it has been created
* - throws RuntimeException instead of System.exit(), allows code reuse
* - switch from gnu regexp (deprecated) to the built in java regexp
* - add generic types to declarations
* 1.2.13
* - adds support for RESyntaxException
*
*/
package fr.dgac.ivy ;
import java.io.*;
import java.net.*;
import java.util.* ;
import gnu.getopt.Getopt;
import java.util.regex.*;
class ProxyClient extends Ivy {
private Socket clientSocket;
private PrintWriter out;
private BufferedReader in;
private static boolean debug = (System.getProperty("IVY_DEBUG")!=null) ;
private volatile Thread clientThread; // volatile to ensure the quick communication
private Hashtable<String,String> id=new Hashtable<String,String>();
private Hashtable<String,Ghost>ghosts = new Hashtable<String,Ghost>();
private Hashtable<String,Puppet> puppets =new Hashtable<String,Puppet>(); // key=id value=Puppet
String domain=null;
public static final int DEFAULT_SERVICE_PORT = 3456 ;
public static final String DEFAULTNAME = "ProxyClient";
public static final String helpmsg = "usage: java fr.dgac.ivy.ProxyClient [options] hostname\n\t-b BUS\tspecifies the Ivy bus domain\n\t-p\tport number, default "+DEFAULT_SERVICE_PORT+"\n\t-n ivyname (default "+DEFAULTNAME+")\n\t-q\tquiet, no tty output\n\t-d\tdebug\n\t-h\thelp\ncontacts the ProxyMaster on hostname\n";
private static String name = DEFAULTNAME;
public static void main(String[] args) {
Ivy bus;
Getopt opt = new Getopt("ProxyClient",args,"n:b:dqp:h");
int c;
int servicePort = DEFAULT_SERVICE_PORT;
boolean quiet = false;
String domain=Ivy.getDomain(null);
while ((c = opt.getopt()) != -1) switch (c) {
case 'n':
name=opt.getOptarg();
break;
case 'b':
domain=opt.getOptarg();
break;
case 'q':
quiet=true;
break;
case 'd':
Properties sysProp = System.getProperties();
sysProp.put("IVY_DEBUG","yes");
break;
case 'p':
String s="";
try {
servicePort = Integer.parseInt(s=opt.getOptarg());
} catch (NumberFormatException nfe) {
System.out.println("Invalid port number: " + s );
throw new RuntimeException();
}
break;
case 'h':
default:
System.out.println(helpmsg);
return ;
}
String hostname="localhost";
try {
new ProxyClient(hostname,servicePort,domain).start();
} catch (IvyException ie) {
System.out.println("error, can't connect to Ivy");
ie.printStackTrace();
throw new RuntimeException();
} catch (IOException ioe) {
System.out.println("error, can't connect to the proxy master");
ioe.printStackTrace();
throw new RuntimeException();
}
}
public ProxyClient(String hostname,int servicePort,String domain) throws IOException, IvyException {
super(name,name+" ready",null); // I will join the bus
System.out.println("PC contacting tcp:"+hostname+":"+servicePort);
clientSocket = new Socket(hostname,servicePort) ; // contacting hostname:servicePort
in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
clientThread=new Thread(new Servicer()); //
this.domain=domain;
}
protected void start() throws IvyException {
clientThread.start();
start(domain);
send("Hello bus="+domain);
}
static Pattern getId,fwdGhost,fwdPuppet,puppetRe;
static {
try {
getId=Pattern.compile("^ID id=(.*) value=(.*)");
fwdGhost=Pattern.compile("^ForwardGhost id=(.*) buffer=(.*)");
fwdPuppet=Pattern.compile("^ForwardPuppet id=(.*) buffer=(.*)");
puppetRe=Pattern.compile("^CreatePuppet id=(.*)");
} catch ( PatternSyntaxException res ) {
res.printStackTrace();
System.out.println("Regular Expression bug in Ivy source code ... bailing out");
throw new RuntimeException();
}
}
void parseMsg(String msg) {
// System.out.println("PC parsing "+msg);
Matcher m;
if ((m=getId.matcher(msg)).matches()) {
id.put(m.group(1),m.group(2));
} else if ((m=puppetRe.matcher(msg)).matches()) { // I must create a puppet
String puppetId = m.group(1);
puppets.put(puppetId,new Puppet(this,puppetId,domain));
} else if ((m=fwdGhost.matcher(msg)).matches()) { // I must forward to the ghost
Ghost g = ghosts.get(m.group(1));
try { g.sendBuffer(m.group(2)); } catch( IvyException ie) { ie.printStackTrace(); }
} else if ((m=fwdPuppet.matcher(msg)).matches()) { // I must forward to the puppet
Puppet p = puppets.get(m.group(1));
try { p.parse(m.group(2)); } catch( IvyException ie) { ie.printStackTrace(); }
} else {
System.out.println("unknown message "+msg);
}
}
class Servicer implements Runnable {
public void run() {
//Thread thisThread = Thread.currentThread();
traceDebug("Thread started");
String msg;
try {
while (true) {
msg=in.readLine();
if (msg==null) break;
parseMsg(msg);
}
} catch (IOException ioe) {
traceDebug("Subreader exception ...");
ioe.printStackTrace();
throw new RuntimeException();
}
traceDebug("Subreader Thread stopped");
System.out.println("connexion to ProxyMaster lost");
for (Puppet p:puppets.values()) p.stop();
stop(); // leave the bus TODO: make a disconnexion/reconnexion possible ?
}
}
void send(String s) { // sends a message to the proxyMaster
out.println(s);
out.flush();
}
/*
* here, I create a ghost instead of a normal Ivy Client, to catch the
* protocol and forward everything to the proxies.
* TODO: remember everything in case a new proxy client comes ?
*/
protected IvyClient createIvyClient(Socket s,int port, boolean domachin) throws IOException {
IvyClient i;
// TODO si c'est un puppet, je ne dois pas creer de Ghost
// voir meme me deconnecter du biniou ?
for (Puppet p:puppets.values()) {
if (( p.bus.getAP() == port ) && !domachin ) {
// this new Ivy agent is in fact one of my puppets ...
System.out.println("not Ghosting this (probable) Puppet Ivy agent");
i= new IvyClient(this,s,port,domachin);
i.start();
return i;
}
}
String key = getWBUId();
String ghostId;
send("GetID id="+key); // asks a centralized ID from ProxyMaster
try { // waits for the answer
while ((ghostId=id.get(key))==null) { Thread.sleep(200); }
Ghost g = new Ghost(this,s,port,domachin,ghostId,this);
ghosts.put(ghostId,g);
return g;
} catch (InterruptedException ie) { ie.printStackTrace(); }
System.out.println("error waiting");
throw new RuntimeException();
}
/*
* the function to forward the protocol to all the Puppets through the
* ProxyMaster
*
*/
protected void forwardPuppet(String id,String buffer) {
out.println("ForwardPuppet id="+id+" buffer="+buffer);
out.flush();
}
private static void traceDebug(String s){
if (debug) System.out.println("-->ProxyClient "+name+"<-- "+s);
}
}
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