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using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Collections;
using System.Collections.Specialized;
using System.IO;
namespace IvyBus
{
/// <summary>
/// Description résumée de IvyStream.
/// </summary>
internal class IvyTCPStreamV3 : NetworkStream, IvyProtocol
{
StreamReader input;
StreamWriter output;
IvyProtocol receiver;
/// the protocol separator
internal const char ARG_START = '\x02';
internal const char ARG_END = '\x03';
internal const char MSG_END = '\n';
internal IvyTCPStreamV3(Socket socket, IvyProtocol _receiver) : base ( socket )
{
output = new StreamWriter(this, Ivy.ivyEncoding);
output.NewLine = MSG_END.ToString();
input = new StreamReader(this, Ivy.ivyEncoding);
receiver = _receiver;
}
/* the protocol magic numbers */
internal enum MessageType : ushort
{
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, ushort msgId, string msgData)
{
// IOException Should be traited upstairs
output.Write((ushort)msgType);
output.Write(' ');
output.Write(msgId);
output.Write(ARG_START);
output.Write(msgData);
output.Write(MSG_END);
output.Flush();
}
void IvyProtocol.TokenStartRegexp(ushort port, string appName)
{
sendMsg(MessageType.StartRegexp, port, appName);
}
void IvyProtocol.TokenEndRegexp()
{
sendMsg(MessageType.EndRegexp, 0, "");
}
void IvyProtocol.TokenApplicationId(ushort priority, string appId)
{
// NOt implemented in this protocol version
}
void IvyProtocol.TokenAddBinding(BindingType type, ushort id, string expression)
{
switch (type)
{
case BindingType.Regexp:
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(ushort id)
{
sendMsg(MessageType.DelBinding, id, "");
}
void IvyProtocol.TokenDirectMsg(ushort id, string message)
{
sendMsg(MessageType.DirectMsg, id, message);
}
void IvyProtocol.TokenPong(string s)
{
sendMsg(MessageType.Pong, 0, s);
}
void IvyProtocol.TokenPing(string s)
{
sendMsg(MessageType.Ping, 0, s);
}
void IvyProtocol.TokenBye(ushort id, string message)
{
sendMsg(MessageType.Bye, id, message);
}
void IvyProtocol.TokenDie(ushort id, string message)
{
sendMsg(MessageType.Die, id, message);
}
void IvyProtocol.TokenMsg(ushort key, string[] args)
{
string delimiter = "" + ARG_END;
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;
sendMsg(MessageType.Msg, key, data);
}
void IvyProtocol.TokenError(ushort key, string arg)
{
sendMsg(MessageType.Msg, key, arg);
}
private ushort DeserializeShort()
{
int read;
ushort ret = 0;
char digit;
// this will eat next non digit char ie space
do
{
read = input.Read();
if (read < 0)
throw new EndOfStreamException();
digit = (char)read;
if (Char.IsDigit(digit))
ret = (ushort)(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;
ushort msgId = 0;
string msgData = null;
try
{
msgType = (MessageType)DeserializeShort();
msgId = DeserializeShort();
msgData = DeserializeString(MSG_END);
switch (msgType)
{
case MessageType.Die:
receiver.TokenDie(msgId, msgData);
break;
case MessageType.Bye:
receiver.TokenBye(msgId, msgData);
break;
case MessageType.AddRegexp:
receiver.TokenAddBinding(BindingType.Regexp, msgId, msgData);
break;
case MessageType.DelBinding:
receiver.TokenDelBinding(msgId);
break;
case MessageType.EndRegexp:
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);
receiver.TokenMsg(msgId, msgData.Split( ARG_END ));
break;
case MessageType.Pong:
receiver.TokenPong(msgData);
break;
case MessageType.Ping:
receiver.TokenPing(msgData);
break;
case MessageType.Error:
receiver.TokenError(msgId, msgData);
break;
case MessageType.StartRegexp:
receiver.TokenStartRegexp(msgId, msgData);
break;
case MessageType.DirectMsg:
receiver.TokenDirectMsg(msgId, msgData);
break;
default:
throw new IvyException("protocol error, unknown message type " + msgType);
}
}
catch (EndOfStreamException)
{
return false;
}
catch (FormatException)
{
throw new IvyException("protocol error on msgType");
}
return true;
}
}
}
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