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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 IvyTCPStreamV4 : NetworkStream , IvyProtocol
{
BinaryReader input;
BinaryWriter output;
IvyProtocol 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 */
ApplicationId = 11, /* on start send my ID and priority */
AddBinding = 12, /* other methods for binding message based on hash table */
};
internal IvyTCPStreamV4(Socket socket, IvyProtocol _receiver) : base( socket )
{
input = new BinaryReader(this, Encoding.ASCII);
output = new BinaryWriter(this, Encoding.ASCII);
receiver = _receiver;
}
/*
* message Syntax:
* this is a binary formated message use of network representation
*
* message Format:
MessageType, id , length, string
*/
private void Serialize(short arg)
{
output.Write((ushort)IPAddress.HostToNetworkOrder(arg));
}
private void Serialize(string arg)
{
short length = arg != null ? (short)arg.Length : (short)0;
Serialize(length);
if (length != 0)
output.Write(arg.ToCharArray());
}
private void Serialize(string[] arg)
{
/* serialize count */
Serialize((short)arg.Length);
for (int i = 0; i < arg.Length; i++)
{
Serialize(arg[i]);
}
}
private void sendMsg(MessageType type, int id, params string[] arg)
{
Serialize( (short)type );
Serialize( (short)id );
Serialize(arg);
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)
{
sendMsg(MessageType.ApplicationId, priority, appId);
}
void IvyProtocol.TokenAddBinding(Ivy.ApplicationBinding bind)
{
if (bind.type == Ivy.BindingType.BindRegexp)
{
sendMsg(MessageType.AddRegexp, bind.key, bind.expression); /* perhaps we should perform some checking here */
}
else
{
sendMsg(MessageType.AddBinding, bind.key, bind.expression); /* perhaps we should perform some checking here */
}
}
void IvyProtocol.TokenDelBinding(ushort id)
{
sendMsg(MessageType.DelBinding, id, null );
}
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)
{
sendMsg(MessageType.Msg, key, args );
}
void IvyProtocol.TokenError(ushort key, string arg)
{
sendMsg(MessageType.Msg, key, arg);
}
private short DeserializeShort()
{
return IPAddress.NetworkToHostOrder((short)input.ReadUInt16());
}
private string DeserializeString()
{
string arg;
int val_len;
char[] data;
val_len = (ushort)DeserializeShort();
if (val_len != 0)
{
data = input.ReadChars(val_len);
arg = new String(data);
}
else
arg = "";
return arg;
}
private string[] DeserializeArgument()
{
int nb_children;
string[] arg;
/* Deserialize childrens */
nb_children = (ushort)DeserializeShort();
/* deserialize Value */
arg = new string[nb_children];
for (int i = 0; i < nb_children; i++)
{
arg[i] = DeserializeString();
}
return arg;
}
bool IvyProtocol.receiveMsg()
{
Ivy.ApplicationBinding bind;
MessageType msgType = MessageType.Die;
ushort msgId = 0;
string[] msgData = null;
try
{
msgType = (MessageType)(ushort)DeserializeShort();
msgId = (ushort)DeserializeShort();
msgData = DeserializeArgument();
switch (msgType)
{
case MessageType.Die:
receiver.TokenDie(msgId, msgData[0]);
break;
case MessageType.Bye:
receiver.TokenBye(msgId, msgData[0]);
break;
case MessageType.AddRegexp:
bind = new Ivy.ApplicationBinding();
bind.type = Ivy.BindingType.BindRegexp;
bind.key = msgId;
bind.expression = msgData[0];
receiver.TokenAddBinding(bind);
break;
case MessageType.AddBinding:
bind = new Ivy.ApplicationBinding();
bind.type = Ivy.BindingType.BindSimple;
bind.key = msgId;
bind.expression = msgData[0];
receiver.TokenAddBinding(bind);
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;
case MessageType.ApplicationId:
receiver.TokenApplicationId(msgId, msgData[0]);
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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