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namespace IvyBus
{
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Collections;
using System.Collections.Specialized;
using System.IO;
using IvyBus.Properties;
/// <summary>
/// Description résumée de IvyStream.
/// </summary>
internal class IvyTCPStreamV3 : NetworkStream, IvyProtocol
{
/// the protocol separator
internal const char ArgStart = '\x02';
internal const char ArgEnd = '\x03';
internal const char MsgEnd = '\n';
private StreamReader input;
private StreamWriter output;
private IvyProtocol receiver;
internal IvyTCPStreamV3(Socket socket, IvyProtocol receiver) : base(socket)
{
this.output = new StreamWriter(this, Ivy.ivyEncoding);
this.output.NewLine = MsgEnd.ToString();
this.input = new StreamReader(this, Ivy.ivyEncoding);
this.receiver = receiver;
}
void IvyProtocol.Close()
{
this.output.Close();
this.input.Close();
if ( this.Socket != null ) // Correct problem in Mono ( under linux )
this.Socket.Shutdown(SocketShutdown.Both);
base.Close();
}
/* the protocol magic numbers */
internal enum MessageType : int
{
Bye = 0, /* end of the peer */
AddRegexp = 1, /* the peer adds a regexp */
Msg = 2, /* the peer sends a message */
Error = 3, /* error message */
DelBinding = 4, /* the peer removes one of his regex */ // OLD DelRegexp rename to DelBinding
EndRegexp = 5, /* no more regexp in the handshake */
StartRegexp = 6, /* avoid race condition in concurrent connexions */
DirectMsg = 7, /* the peer sends a direct message */
Die = 8, /* the peer wants us to quit */
Ping = 9, /* checks the presence of the other */
Pong = 10, /* checks the presence of the other */
}
/*
* message Syntax:
* this is text formated message 'type id STX ARG0 {[ETX] ARG1 [ETX] ARGn}\n'
*
* message Format:
MessageType, id , length, string
*/
private void SendMsg(MessageType msgType, int msgId, string msgData)
{
// IOException Should be traited upstairs
lock (this.output)
{
this.output.Write((int)msgType);
this.output.Write(' ');
this.output.Write(msgId);
this.output.Write(ArgStart);
this.output.Write(msgData);
this.output.Write(MsgEnd);
this.output.Flush();
}
}
void IvyProtocol.TokenStartRegexp(int port, string appName)
{
this.SendMsg(MessageType.StartRegexp, port, appName);
}
void IvyProtocol.TokenEndRegexp()
{
this.SendMsg(MessageType.EndRegexp, 0, string.Empty);
}
void IvyProtocol.TokenAddBinding(BindingType type, int id, string expression)
{
switch (type)
{
case BindingType.RegularExpression:
this.SendMsg(MessageType.AddRegexp, id, expression); /* perhaps we should perform some checking here */
break;
case BindingType.Simple:
// NO Simple Binding in this protocol
break;
}
}
void IvyProtocol.TokenDelBinding(int id)
{
this.SendMsg(MessageType.DelBinding, id, string.Empty);
}
void IvyProtocol.TokenDirectMsg(int id, string message)
{
this.SendMsg(MessageType.DirectMsg, id, message);
}
void IvyProtocol.TokenPong(int id, string s)
{
this.SendMsg(MessageType.Pong, id, s);
}
void IvyProtocol.TokenPing(int id, string s)
{
this.SendMsg(MessageType.Ping, id, s);
}
void IvyProtocol.TokenBye(int id, string message)
{
this.SendMsg(MessageType.Bye, id, message);
}
void IvyProtocol.TokenDie(int id, string message)
{
this.SendMsg(MessageType.Die, id, message);
}
void IvyProtocol.TokenMsg(int key, string[] args)
{
string delimiter = string.Empty + ArgEnd;
string data = string.Join(delimiter, args);
// a bad protocol implementation in C add a delimiter to the end of each arg
// we must add a delimiter to the end
data += delimiter;
this.SendMsg(MessageType.Msg, key, data);
}
void IvyProtocol.TokenError(int key, string arg)
{
this.SendMsg(MessageType.Error, key, arg);
}
private int DeserializeInt()
{
int read;
int ret = 0;
char digit;
// this will eat next non digit char ie space
do
{
read = this.input.Read();
if (read < 0)
throw new EndOfStreamException();
digit = (char)read;
if (Char.IsDigit(digit))
ret = (int)(ret * 10 + (digit - 0x30));
} while (Char.IsDigit(digit));
return ret;
}
private string DeserializeString(char sep)
{
int read;
char car;
StringBuilder str = new StringBuilder();
// this will eat next non separator char
do
{
read = input.Read();
if (read < 0)
throw new EndOfStreamException();
car = (char)read;
if (car != sep ) str.Append(car);
} while (car != sep);
return str.ToString();
}
bool IvyProtocol.ReceiveMsg()
{
MessageType msgType = MessageType.Die;
int msgId = 0;
string msgData = null;
try
{
msgType = (MessageType)DeserializeInt();
msgId = DeserializeInt();
msgData = DeserializeString(MsgEnd);
switch (msgType)
{
case MessageType.Die:
this.receiver.TokenDie(msgId, msgData);
break;
case MessageType.Bye:
this.receiver.TokenBye(msgId, msgData);
break;
case MessageType.AddRegexp:
this.receiver.TokenAddBinding(BindingType.RegularExpression, msgId, msgData);
break;
case MessageType.DelBinding:
this.receiver.TokenDelBinding(msgId);
break;
case MessageType.EndRegexp:
this.receiver.TokenEndRegexp();
break;
case MessageType.Msg:
// a bad protocol implementation in C add a delimiter to the end of each arg
// we must remove a delimiter to the end
if ( msgData.Length > 0 )
msgData = msgData.Remove(msgData.Length - 1,1);
this.receiver.TokenMsg(msgId, msgData.Split( ArgEnd ));
break;
case MessageType.Pong:
this.receiver.TokenPong(msgId,msgData);
break;
case MessageType.Ping:
this.receiver.TokenPing(msgId,msgData);
break;
case MessageType.Error:
this.receiver.TokenError(msgId, msgData);
break;
case MessageType.StartRegexp:
this.receiver.TokenStartRegexp(msgId, msgData);
break;
case MessageType.DirectMsg:
this.receiver.TokenDirectMsg(msgId, msgData);
break;
default:
throw new IvyException(Resources.UnknownMessage + msgType);
}
}
catch (NullReferenceException)
{
return false;
}
catch (EndOfStreamException)
{
return false;
}
catch (FormatException)
{
throw new IvyException(Resources.ProtocolError);
}
return true;
}
}
}
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