Various update bits.
[dcpomatic.git] / src / lib / update.cc
1 /*
2     Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
3
4     This program is free software; you can redistribute it and/or modify
5     it under the terms of the GNU General Public License as published by
6     the Free Software Foundation; either version 2 of the License, or
7     (at your option) any later version.
8
9     This program is distributed in the hope that it will be useful,
10     but WITHOUT ANY WARRANTY; without even the implied warranty of
11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12     GNU General Public License for more details.
13
14     You should have received a copy of the GNU General Public License
15     along with this program; if not, write to the Free Software
16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17
18 */
19
20 #include <string>
21 #include <sstream>
22 #include <boost/algorithm/string.hpp>
23 #include <curl/curl.h>
24 #include <libcxml/cxml.h>
25 #include "update.h"
26 #include "version.h"
27 #include "ui_signaller.h"
28
29 #define BUFFER_SIZE 1024
30
31 using std::cout;
32 using std::min;
33 using std::string;
34 using std::stringstream;
35 using boost::lexical_cast;
36
37 UpdateChecker* UpdateChecker::_instance = 0;
38
39 static size_t
40 write_callback_wrapper (void* data, size_t size, size_t nmemb, void* user)
41 {
42         return reinterpret_cast<UpdateChecker*>(user)->write_callback (data, size, nmemb);
43 }
44
45 UpdateChecker::UpdateChecker ()
46         : _buffer (new char[BUFFER_SIZE])
47         , _offset (0)
48         , _curl (0)
49         , _state (NOT_RUN)
50         , _emits (0)
51 {
52         curl_global_init (CURL_GLOBAL_ALL);
53         _curl = curl_easy_init ();
54
55         curl_easy_setopt (_curl, CURLOPT_URL, "http://dcpomatic.com/update");
56         curl_easy_setopt (_curl, CURLOPT_WRITEFUNCTION, write_callback_wrapper);
57         curl_easy_setopt (_curl, CURLOPT_WRITEDATA, this);
58         curl_easy_setopt (_curl, CURLOPT_TIMEOUT, 20);
59         
60         string const agent = "dcpomatic/" + string (dcpomatic_version);
61         curl_easy_setopt (_curl, CURLOPT_USERAGENT, agent.c_str ());
62
63         _thread = new boost::thread (boost::bind (&UpdateChecker::thread, this));
64 }
65
66 UpdateChecker::~UpdateChecker ()
67 {
68         /* We are not cleaning up our thread, but hey well */
69         
70         curl_easy_cleanup (_curl);
71         curl_global_cleanup ();
72         delete[] _buffer;
73 }
74
75 void
76 UpdateChecker::run ()
77 {
78         boost::mutex::scoped_lock lm (_process_mutex);
79         _condition.notify_one ();
80 }
81
82 void
83 UpdateChecker::thread ()
84 {
85         while (1) {
86                 boost::mutex::scoped_lock lock (_process_mutex);
87                 _condition.wait (lock);
88                 lock.unlock ();
89                 
90                 try {
91                         _offset = 0;
92                         
93                         int r = curl_easy_perform (_curl);
94                         if (r != CURLE_OK) {
95                                 set_state (FAILED);
96                                 return;
97                         }
98                         
99                         _buffer[_offset] = '\0';
100                         stringstream s;
101                         s << _buffer;
102                         cxml::Document doc ("Update");
103                         doc.read_stream (s);
104                         
105                         {
106                                 boost::mutex::scoped_lock lm (_data_mutex);
107                                 _stable = doc.string_child ("Stable");
108                                 _test = doc.string_child ("Test");
109                         }
110                         
111                         string current = string (dcpomatic_version);
112                         bool current_pre = false;
113                         if (boost::algorithm::ends_with (current, "pre")) {
114                                 current = current.substr (0, current.length() - 3);
115                                 current_pre = true;
116                         }
117                         
118                         float current_float = lexical_cast<float> (current);
119                         if (current_pre) {
120                                 current_float -= 0.005;
121                         }
122                         
123                         if (current_float < lexical_cast<float> (_stable)) {
124                                 set_state (YES);
125                         } else {
126                                 set_state (NO);
127                         }
128                 } catch (...) {
129                         set_state (FAILED);
130                 }
131         }
132 }
133         
134 size_t
135 UpdateChecker::write_callback (void* data, size_t size, size_t nmemb)
136 {
137         size_t const t = min (size * nmemb, size_t (BUFFER_SIZE - _offset - 1));
138         memcpy (_buffer + _offset, data, t);
139         _offset += t;
140         return t;
141 }
142
143 void
144 UpdateChecker::set_state (State s)
145 {
146         {
147                 boost::mutex::scoped_lock lm (_data_mutex);
148                 _state = s;
149                 _emits++;
150         }
151
152         ui_signaller->emit (boost::bind (boost::ref (StateChanged)));
153 }
154
155 UpdateChecker *
156 UpdateChecker::instance ()
157 {
158         if (!_instance) {
159                 _instance = new UpdateChecker ();
160         }
161
162         return _instance;
163 }
164
165