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
|
/*
Copyright (c) 2009-2011 250bpm s.r.o.
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2011 VMware, Inc.
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "req.hpp"
#include "err.hpp"
#include "msg.hpp"
#include "wire.hpp"
#include "random.hpp"
#include "likely.hpp"
zmq::req_t::req_t (class ctx_t *parent_, uint32_t tid_) :
xreq_t (parent_, tid_),
receiving_reply (false),
message_begins (true)
{
options.type = ZMQ_REQ;
}
zmq::req_t::~req_t ()
{
}
int zmq::req_t::xsend (msg_t *msg_, int flags_)
{
// If we've sent a request and we still haven't got the reply,
// we can't send another request.
if (receiving_reply) {
errno = EFSM;
return -1;
}
// First part of the request is the request identity.
if (message_begins) {
msg_t bottom;
int rc = bottom.init ();
errno_assert (rc == 0);
bottom.set_flags (msg_t::more);
rc = xreq_t::xsend (&bottom, 0);
if (rc != 0)
return -1;
message_begins = false;
}
bool more = msg_->flags () & msg_t::more ? true : false;
int rc = xreq_t::xsend (msg_, flags_);
if (rc != 0)
return rc;
// If the request was fully sent, flip the FSM into reply-receiving state.
if (!more) {
receiving_reply = true;
message_begins = true;
}
return 0;
}
int zmq::req_t::xrecv (msg_t *msg_, int flags_)
{
// If request wasn't send, we can't wait for reply.
if (!receiving_reply) {
errno = EFSM;
return -1;
}
// First part of the reply should be the original request ID.
if (message_begins) {
int rc = xreq_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
// TODO: This should also close the connection with the peer!
if (unlikely (!(msg_->flags () & msg_t::more) || msg_->size () != 0)) {
while (true) {
int rc = xreq_t::xrecv (msg_, flags_);
errno_assert (rc == 0);
if (!(msg_->flags () & msg_t::more))
break;
}
msg_->close ();
msg_->init ();
errno = EAGAIN;
return -1;
}
message_begins = false;
}
int rc = xreq_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
// If the reply is fully received, flip the FSM into request-sending state.
if (!(msg_->flags () & msg_t::more)) {
receiving_reply = false;
message_begins = true;
}
return 0;
}
bool zmq::req_t::xhas_in ()
{
// TODO: Duplicates should be removed here.
if (!receiving_reply)
return false;
return xreq_t::xhas_in ();
}
bool zmq::req_t::xhas_out ()
{
if (receiving_reply)
return false;
return xreq_t::xhas_out ();
}
zmq::req_session_t::req_session_t (io_thread_t *io_thread_, bool connect_,
socket_base_t *socket_, const options_t &options_,
const char *protocol_, const char *address_) :
xreq_session_t (io_thread_, connect_, socket_, options_, protocol_,
address_)
{
}
zmq::req_session_t::~req_session_t ()
{
}
int zmq::req_session_t::write (msg_t *msg_)
{
if (state == bottom) {
if (msg_->flags () == msg_t::more && msg_->size () == 0) {
state = body;
return xreq_session_t::write (msg_);
}
}
else {
if (msg_->flags () == msg_t::more)
return xreq_session_t::write (msg_);
if (msg_->flags () == 0) {
state = bottom;
return xreq_session_t::write (msg_);
}
}
errno = EFAULT;
return -1;
}
|
