1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
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, Encoding.ASCII);
output.NewLine = MSG_END.ToString();
input = new StreamReader(this, 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 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;
}
}
}
|
