/**
* Intiate and open a connection to a remote node.
*
* @exception java.io.IOException if it was not possible to connect to the
* peer.
*
* @exception OtpAuthException if handshake resulted in an authentication
* error.
*/
protected AbstractConnection(OtpLocalNode self, OtpPeer other)
: base("receive", true)
{
peer = other;
this.self = self;
socket = null;
int port;
traceLevel = defaultLevel;
// now get a connection between the two...
port = OtpEpmd.lookupPort(peer);
// now find highest common dist value
if (peer.Proto != self.Proto || self.DistHigh < peer.DistLow || self.DistLow > peer.DistHigh)
{
throw new IOException("No common protocol found - cannot connect");
}
// highest common version: min(peer.distHigh, self.distHigh)
peer.DistChoose = peer.DistHigh > self.DistHigh ? self.DistHigh : peer.DistHigh;
doConnect(port);
name = peer.Node;
connected = true;
}
/*
* find or create a connection to the given node
*/
public OtpCookedConnection getConnection(String node)
{
OtpPeer peer = null;
OtpCookedConnection conn = null;
lock (connections)
{
// first just try looking up the name as-is
if (connections.ContainsKey(node))
{
conn = connections[node];
}
else
{
// in case node had no '@' add localhost info and try again
peer = new OtpPeer(node);
if (connections.ContainsKey(peer.Node))
{
conn = connections[peer.Node];
}
else
{
try
{
conn = new OtpCookedConnection(this, peer);
conn.setFlags(flags);
addConnection(conn);
}
catch (Exception e)
{
/* false = outgoing */
connAttempt(peer.Node, false, e);
}
}
}
return conn;
}
}
/**
* Accept an incoming connection from a remote node. Used by {@link
* OtpSelf#accept() OtpSelf.accept()} to create a connection based on data
* received when handshaking with the peer node, when the remote node is the
* connection intitiator.
*
* @exception java.io.IOException if it was not possible to connect to the
* peer.
*
* @exception OtpAuthException if handshake resulted in an authentication
* error
*/
protected AbstractConnection(OtpLocalNode self, BufferedTcpClient s)
: base("receive", true)
{
this.self = self;
peer = new OtpPeer();
socket = s;
traceLevel = defaultLevel;
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- ACCEPT FROM " + s.Client.RemoteEndPoint);
}
// get his info
recvName(peer);
// now find highest common dist value
if (peer.Proto != self.Proto || self.DistHigh < peer.DistLow || self.DistLow > peer.DistHigh)
{
close();
throw new IOException("No common protocol found - cannot accept connection");
}
// highest common version: min(peer.distHigh, self.distHigh)
peer.DistChoose = peer.DistHigh > self.DistHigh ? self.DistHigh : peer.DistHigh;
doAccept();
name = peer.Node;
}
protected void recvName(OtpPeer peer)
{
String hisname = "";
try
{
byte[] tmpbuf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
byte[] tmpname;
int len = tmpbuf.Length;
peer.Type = ibuf.read1();
if (peer.Type != AbstractNode.NTYPE_R6)
{
throw new IOException("Unknown remote node type");
}
peer.DistLow = peer.DistHigh = ibuf.read2BE();
if (peer.DistLow < 5)
{
throw new IOException("Unknown remote node type");
}
peer.Flags = ibuf.read4BE();
tmpname = new byte[len - 7];
ibuf.readN(tmpname);
hisname = OtpErlangString.newString(tmpname);
// Set the old nodetype parameter to indicate hidden/normal status
// When the old handshake is removed, the ntype should also be.
if ((peer.Flags & AbstractNode.dFlagPublished) != 0)
{
peer.Type = AbstractNode.NTYPE_R4_ERLANG;
}
else
{
peer.Type = AbstractNode.NTYPE_R4_HIDDEN;
}
if ((peer.Flags & AbstractNode.dFlagExtendedReferences) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended references");
}
if ((peer.Flags & AbstractNode.dFlagExtendedPidsPorts) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended pids and ports");
}
}
catch (OtpErlangDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
int i = hisname.IndexOf('@', 0);
peer.Node = hisname;
peer.Alive = hisname.Substring(0, i);
peer.Host = hisname.Substring(i + 1, hisname.Length - (i + 1));
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE" + " ntype=" + peer.Type
+ " dist=" + peer.DistHigh + " remote=" + peer);
}
}
/*
* Intiate and open a connection to a remote node.
*
* @exception java.io.IOException if it was not possible to connect to the
* peer.
*
* @exception OtpAuthException if handshake resulted in an authentication
* error.
*/
// package scope
internal OtpConnection(OtpSelf self, OtpPeer other)
: base(self, other)
{
this.self = self;
queue = new GenericQueue();
start();
}
/*
* Intiate and open a connection to a remote node.
*
* @exception java.io.IOException if it was not possible to connect to the
* peer.
*
* @exception OtpAuthException if handshake resulted in an authentication
* error.
*/
// package scope
internal OtpCookedConnection(OtpNode self, OtpPeer other)
: base(self, other)
{
this.self = self;
links = new Links(25);
start();
}
/**
* Open a connection to a remote node.
*
* @param other
* the remote node to which you wish to connect.
*
* @return a connection to the remote node.
*
* @exception java.net.UnknownHostException
* if the remote host could not be found.
*
* @exception java.io.IOException
* if it was not possible to connect to the remote node.
*
* @exception OtpAuthException
* if the connection was refused by the remote node.
*/
public OtpConnection connect(OtpPeer other)
{
return new OtpConnection(this, other);
}