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
|
/*
Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "encode_server_finder.h"
#include "exceptions.h"
#include "util.h"
#include "config.h"
#include "cross.h"
#include "encode_server_description.h"
#include "dcpomatic_socket.h"
#include "raw_convert.h"
#include <libcxml/cxml.h>
#include <boost/lambda/lambda.hpp>
#include <iostream>
#include "i18n.h"
using std::string;
using std::list;
using std::vector;
using std::cout;
using boost::shared_ptr;
using boost::scoped_array;
using boost::weak_ptr;
EncodeServerFinder* EncodeServerFinder::_instance = 0;
EncodeServerFinder::EncodeServerFinder ()
: _disabled (false)
, _search_thread (0)
, _listen_thread (0)
, _stop (false)
{
Config::instance()->Changed.connect (boost::bind (&EncodeServerFinder::config_changed, this, _1));
}
void
EncodeServerFinder::start ()
{
_search_thread = new boost::thread (boost::bind (&EncodeServerFinder::search_thread, this));
_listen_thread = new boost::thread (boost::bind (&EncodeServerFinder::listen_thread, this));
}
EncodeServerFinder::~EncodeServerFinder ()
{
_stop = true;
_search_condition.notify_all ();
if (_search_thread) {
DCPOMATIC_ASSERT (_search_thread->joinable ());
_search_thread->join ();
}
_listen_io_service.stop ();
if (_listen_thread) {
DCPOMATIC_ASSERT (_listen_thread->joinable ());
_listen_thread->join ();
}
}
void
EncodeServerFinder::search_thread ()
try
{
boost::system::error_code error;
boost::asio::io_service io_service;
boost::asio::ip::udp::socket socket (io_service);
socket.open (boost::asio::ip::udp::v4(), error);
if (error) {
throw NetworkError ("failed to set up broadcast socket");
}
socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
socket.set_option (boost::asio::socket_base::broadcast (true));
string const data = DCPOMATIC_HELLO;
while (!_stop) {
if (Config::instance()->use_any_servers ()) {
/* Broadcast to look for servers */
try {
boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
} catch (...) {
}
}
/* Query our `definite' servers (if there are any) */
vector<string> servers = Config::instance()->servers ();
for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
if (server_found (*i)) {
/* Don't bother asking a server that we already know about */
continue;
}
try {
boost::asio::ip::udp::resolver resolver (io_service);
boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (Config::instance()->server_port_base() + 1));
boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
} catch (...) {
}
}
boost::mutex::scoped_lock lm (_search_condition_mutex);
_search_condition.timed_wait (lm, boost::get_system_time() + boost::posix_time::seconds (10));
}
}
catch (...)
{
store_current ();
}
void
EncodeServerFinder::listen_thread ()
try {
using namespace boost::asio::ip;
try {
_listen_acceptor.reset (new tcp::acceptor (_listen_io_service, tcp::endpoint (tcp::v4(), Config::instance()->server_port_base() + 1)));
} catch (...) {
boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
}
start_accept ();
_listen_io_service.run ();
}
catch (...)
{
store_current ();
}
void
EncodeServerFinder::start_accept ()
{
shared_ptr<Socket> socket (new Socket ());
_listen_acceptor->async_accept (
socket->socket(),
boost::bind (&EncodeServerFinder::handle_accept, this, boost::asio::placeholders::error, socket)
);
}
void
EncodeServerFinder::handle_accept (boost::system::error_code ec, shared_ptr<Socket> socket)
{
if (ec) {
start_accept ();
return;
}
uint32_t length;
socket->read (reinterpret_cast<uint8_t*> (&length), sizeof (uint32_t));
length = ntohl (length);
scoped_array<char> buffer (new char[length]);
socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
string s (buffer.get());
shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
xml->read_string (s);
string const ip = socket->socket().remote_endpoint().address().to_string ();
if (!server_found (ip) && xml->optional_number_child<int>("Version").get_value_or (0) == SERVER_LINK_VERSION) {
EncodeServerDescription sd (ip, xml->number_child<int> ("Threads"));
{
boost::mutex::scoped_lock lm (_servers_mutex);
_servers.push_back (sd);
}
emit (boost::bind (boost::ref (ServersListChanged)));
}
start_accept ();
}
bool
EncodeServerFinder::server_found (string ip) const
{
boost::mutex::scoped_lock lm (_servers_mutex);
list<EncodeServerDescription>::const_iterator i = _servers.begin();
while (i != _servers.end() && i->host_name() != ip) {
++i;
}
return i != _servers.end ();
}
EncodeServerFinder*
EncodeServerFinder::instance ()
{
if (!_instance) {
_instance = new EncodeServerFinder ();
_instance->start ();
}
return _instance;
}
void
EncodeServerFinder::drop ()
{
delete _instance;
_instance = 0;
}
list<EncodeServerDescription>
EncodeServerFinder::servers () const
{
boost::mutex::scoped_lock lm (_servers_mutex);
return _servers;
}
void
EncodeServerFinder::config_changed (Config::Property what)
{
if (what == Config::USE_ANY_SERVERS || what == Config::SERVERS) {
{
boost::mutex::scoped_lock lm (_servers_mutex);
_servers.clear ();
}
ServersListChanged ();
_search_condition.notify_all ();
}
}
|
