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
|
/*
Copyright (c) 2012 250bpm s.r.o.
Copyright (c) 2012 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O 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.
Crossroads 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 <algorithm>
#include "surveyor.hpp"
#include "err.hpp"
#include "msg.hpp"
#include "wire.hpp"
#include "likely.hpp"
#include "random.hpp"
xs::surveyor_t::surveyor_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
xsurveyor_t (parent_, tid_, sid_),
receiving_responses (false),
survey_id (generate_random ()),
timeout (0)
{
options.type = XS_SURVEYOR;
}
xs::surveyor_t::~surveyor_t ()
{
}
int xs::surveyor_t::xsend (msg_t *msg_, int flags_)
{
int rc;
// Survey pattern works only with sigle-part messages.
if (flags_ & XS_SNDMORE || msg_->flags () & msg_t::more) {
errno = EINVAL;
return -1;
}
// Start the new survey. First, generate new survey ID.
++survey_id;
msg_t id;
rc = id.init_size (4);
errno_assert (rc == 0);
put_uint32 ((unsigned char*) id.data (), survey_id);
id.set_flags (msg_t::more);
rc = xsurveyor_t::xsend (&id, 0);
if (rc != 0) {
id.close ();
return -1;
}
id.close ();
// Now send the body of the survey.
rc = xsurveyor_t::xsend (msg_, flags_);
errno_assert (rc == 0);
// Start waiting for responses from the peers.
receiving_responses = true;
// Set up the timeout for the survey (-1 means infinite).
if (!options.survey_timeout)
timeout = -1;
else
timeout = now_ms () + options.survey_timeout;
return 0;
}
int xs::surveyor_t::xrecv (msg_t *msg_, int flags_)
{
int rc;
// If there's no survey underway, it's an error.
if (!receiving_responses) {
errno = EFSM;
return -1;
}
// Get the first part of the response -- the survey ID.
rc = xsurveyor_t::xrecv (msg_, flags_);
if (rc != 0) {
if (errno != EAGAIN)
return -1;
// In case of AGAIN we should check whether the survey timeout expired.
// If so, we should return ETIMEDOUT so that user is able to
// distinguish survey timeout from RCVTIMEO-caused timeout.
errno = now_ms () >= timeout ? ETIMEDOUT : EAGAIN;
return -1;
}
// Check whether this is response for the onging survey. If not, we can
// drop the response.
if (unlikely (!(msg_->flags () & msg_t::more) || msg_->size () != 4 ||
get_uint32 ((unsigned char*) msg_->data ()) != survey_id)) {
while (true) {
rc = xsurveyor_t::xrecv (msg_, flags_);
errno_assert (rc == 0);
if (!(msg_->flags () & msg_t::more))
break;
}
msg_->close ();
msg_->init ();
errno = EAGAIN;
return -1;
}
// Get the body of the response.
rc = xsurveyor_t::xrecv (msg_, flags_);
errno_assert (rc == 0);
return 0;
}
bool xs::surveyor_t::xhas_in ()
{
// TODO: We need a prefetched_message here...
xs_assert (false);
return false;
}
bool xs::surveyor_t::xhas_out ()
{
return xsurveyor_t::xhas_out ();
}
int xs::surveyor_t::rcvtimeo ()
{
int t = (int) (timeout - now_ms ());
if (t < 0)
return options.rcvtimeo;
if (options.rcvtimeo < 0)
return t;
return std::min (t, options.rcvtimeo);
}
xs::surveyor_session_t::surveyor_session_t (io_thread_t *io_thread_,
bool connect_, socket_base_t *socket_, const options_t &options_,
const char *protocol_, const char *address_) :
xsurveyor_session_t (io_thread_, connect_, socket_, options_, protocol_,
address_)
{
}
xs::surveyor_session_t::~surveyor_session_t ()
{
}
|
