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
|
/*
Copyright (c) 2007-2009 FastMQ Inc.
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "zmq_tcp_engine.hpp"
#include "config.hpp"
#include "i_session.hpp"
#include "err.hpp"
zmq::zmq_tcp_engine_t::zmq_tcp_engine_t (fd_t fd_) :
poller (NULL),
session (NULL),
terminating (false),
insize (0),
inpos (0),
outsize (0),
outpos (0)
{
// Allocate read & write buffer.
inbuf = new unsigned char [in_batch_size];
zmq_assert (inbuf);
outbuf = new unsigned char [out_batch_size];
zmq_assert (outbuf);
// Attach the socket.
int rc = socket.open (fd_);
zmq_assert (rc == 0);
}
void zmq::zmq_tcp_engine_t::attach (i_poller *poller_, i_session *session_)
{
zmq_assert (!poller);
poller = poller_;
zmq_assert (!session);
session = session_;
encoder.set_session (session);
decoder.set_session (session);
// Let session know we are here.
session->set_engine (this);
// Register the engine with the polling thread.
handle = poller->add_fd (socket.get_fd (), this);
poller->set_pollin (handle);
poller->set_pollout (handle);
// Flush any pending inbound messages.
in_event ();
}
void zmq::zmq_tcp_engine_t::detach ()
{
zmq_assert (poller);
poller->rm_fd (handle);
poller = NULL;
zmq_assert (session);
session->set_engine (NULL);
session = NULL;
encoder.set_session (NULL);
decoder.set_session (NULL);
}
void zmq::zmq_tcp_engine_t::revive ()
{
zmq_assert (poller);
poller->set_pollout (handle);
}
void zmq::zmq_tcp_engine_t::schedule_terminate ()
{
terminating = true;
}
void zmq::zmq_tcp_engine_t::terminate ()
{
delete this;
}
void zmq::zmq_tcp_engine_t::shutdown ()
{
delete this;
}
zmq::zmq_tcp_engine_t::~zmq_tcp_engine_t ()
{
detach ();
delete [] outbuf;
delete [] inbuf;
}
void zmq::zmq_tcp_engine_t::in_event ()
{
// If there's no data to process in the buffer, read new data.
if (inpos == insize) {
// Read as much data as possible to the read buffer.
insize = socket.read (inbuf, in_batch_size);
inpos = 0;
// Check whether the peer has closed the connection.
if (insize == -1) {
insize = 0;
error ();
return;
}
}
// Following code should be executed even if there's not a single byte in
// the buffer. There still can be a decoded messages stored in the decoder.
// Push the data to the decoder.
int nbytes = decoder.write (inbuf + inpos, insize - inpos);
// Adjust read position. Stop polling for input if we got stuck.
inpos += nbytes;
if (inpos < insize)
poller->reset_pollin (handle);
// If at least one byte was processed, flush all messages the decoder
// may have produced. If engine is disconnected from session, no need
// to flush the messages. It's important that flush is called at the
// very end of in_event as it may invoke in_event itself.
if (nbytes > 0 && session)
session->flush ();
}
void zmq::zmq_tcp_engine_t::out_event ()
{
// If write buffer is empty, try to read new data from the encoder.
if (outpos == outsize) {
outsize = encoder.read (outbuf, out_batch_size);
outpos = 0;
// If there are no more pipes, engine can be deallocated.
if (terminating) {
terminate ();
return;
}
// If there is no data to send, stop polling for output.
if (outsize == 0)
poller->reset_pollout (handle);
}
// If there are any data to write in write buffer, write as much as
// possible to the socket.
if (outpos < outsize) {
int nbytes = socket.write (outbuf + outpos, outsize - outpos);
// Handle problems with the connection.
if (nbytes == -1) {
error ();
return;
}
outpos += nbytes;
}
}
void zmq::zmq_tcp_engine_t::timer_event ()
{
zmq_assert (false);
}
void zmq::zmq_tcp_engine_t::error ()
{
zmq_assert (false);
}
|
