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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 : IvyTCPStream
{
StreamReader input;
StreamWriter output;
IvyProtocolInterface 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, IvyProtocolInterface _receiver) : base ( socket )
{
output = new StreamWriter(stream, Encoding.ASCII);
output.NewLine = MSG_END.ToString();
input = new StreamReader(stream, Encoding.ASCII);
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 Serialize(ushort arg, char sep)
{
output.Write(arg);
output.Write(sep);
}
private void Serialize(string[] arg, char sep)
{
for (int i = 0; i < arg.Length; i++)
{
output.Write(arg[i]);
if ( i != (arg.Length-1) ) output.Write(sep);
}
}
private void sendMsg(MessageType msgType, ushort msgId,params string[] msgData)
{
#if DEBUG
Console.WriteLine(" sendMsg {0} id={1} data={2}", msgType, msgId, msgData);
#endif
Serialize((ushort)msgType, ' ');
Serialize(msgId, ARG_START);
Serialize(msgData, ARG_END);
output.Write(MSG_END);
output.Flush();
}
public override void TokenStartRegexp(ushort port, string appName)
{
sendMsg(MessageType.StartRegexp, port, appName);
}
public override void TokenEndRegexp()
{
sendMsg(MessageType.EndRegexp, 0, "");
}
public override void TokenApplicationId(ushort priority, string appId)
{
// NOt implemented in this protocol version
}
public override void TokenAddRegexp(ushort id, string bind)
{
sendMsg(MessageType.AddRegexp, id, bind); /* perhaps we should perform some checking here */
}
public override void TokenAddBinding(ushort id, string bind)
{
// NOt implemented in this protocol version
}
public override void TokenDelBinding(ushort id)
{
sendMsg(MessageType.DelBinding, id, "");
}
public override void TokenDirectMsg(ushort id, string message)
{
sendMsg(MessageType.DirectMsg, id, message);
}
public override void TokenPong(string s)
{
sendMsg(MessageType.Pong, 0, s);
}
public override void TokenPing(string s)
{
sendMsg(MessageType.Ping, 0, s);
}
public override void TokenBye(ushort id, string message)
{
sendMsg(MessageType.Bye, id, message);
}
public override void TokenDie(ushort id, string message)
{
sendMsg(MessageType.Die, id, message);
}
public override void TokenMsg(ushort key, string[] args)
{
sendMsg(MessageType.Msg, key, args);
}
public override void 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) break;
digit = (char)read;
if (Char.IsDigit(digit))
ret = (ushort)(ret * 10 + (digit - 0x30));
} while (Char.IsDigit(digit));
return ret;
}
private string DeserializeString(char sep,char eol_sep, out bool eol)
{
int read;
char car = eol_sep;
StringBuilder str = new StringBuilder();
// this will eat next non separator char
do
{
read = input.Read();
if (read < 0) break;
car = (char)read;
if (car != sep && car != eol_sep) str.Append(car);
} while (car != sep && car != eol_sep);
eol = car == eol_sep || (read < 0 );
return str.ToString();
}
private string[] DeserializeArgument()
{
StringCollection coll;
string[] args;
string str;
bool eol;
coll = new StringCollection();
do
{
str = DeserializeString(ARG_END, MSG_END, out eol);
coll.Add(str);
} while (!eol);
args = new string[coll.Count];
coll.CopyTo(args, 0);
return args;
}
internal override bool receiveMsg()
{
MessageType msgType = MessageType.Die;
ushort msgId = 0;
string[] msgData = null;
try
{
msgType = (MessageType)DeserializeShort();
msgId = DeserializeShort();
msgData = DeserializeArgument();
#if DEBUG
Console.WriteLine(" receiveMsg {0} id={1} data={2}", msgType, msgId, msgData);
#endif
switch (msgType)
{
case MessageType.Die:
receiver.TokenDie(msgId, msgData[0]);
break;
case MessageType.Bye:
receiver.TokenBye(msgId, msgData[0]);
break;
case MessageType.AddRegexp:
receiver.TokenAddRegexp(msgId, msgData[0]);
break;
case MessageType.DelBinding:
receiver.TokenDelBinding(msgId);
break;
case MessageType.EndRegexp:
receiver.TokenEndRegexp();
break;
case MessageType.Msg:
receiver.TokenMsg(msgId, msgData);
break;
case MessageType.Pong:
receiver.TokenPong(msgData[0]);
break;
case MessageType.Ping:
receiver.TokenPing(msgData[0]);
break;
case MessageType.Error:
receiver.TokenError(msgId, msgData[0]);
break;
case MessageType.StartRegexp:
receiver.TokenStartRegexp(msgId, msgData[0]);
break;
case MessageType.DirectMsg:
receiver.TokenDirectMsg(msgId, msgData[0]);
break;
default:
throw new IvyException("protocol error, unknown message type " + msgType);
}
}
catch (EndOfStreamException nfe)
{
return false;
}
catch (FormatException nfe)
{
throw new IvyException("protocol error on msgType");
}
return true;
}
}
}
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