src/lib/json_server.cc

   1 /*
   2     Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "json_server.h"
  22 #include "job_manager.h"
  23 #include "job.h"
  24 #include "util.h"
  25 #include "film.h"
  26 #include "transcode_job.h"
  27 #include <dcp/raw_convert.h>
  28 #include <boost/asio.hpp>
  29 #include <boost/bind.hpp>
  30 #include <boost/thread.hpp>
  31 #include <iostream>
  32
  33 using std::string;
  34 using std::cout;
  35 using std::map;
  36 using std::list;
  37 using boost::thread;
  38 using boost::shared_ptr;
  39 using boost::dynamic_pointer_cast;
  40 using boost::asio::ip::tcp;
  41 using dcp::raw_convert;
  42
  43 #define MAX_LENGTH 512
  44
  45 enum State {
  46         AWAITING_G,
  47         AWAITING_E,
  48         AWAITING_T,
  49         AWAITING_SPACE,
  50         READING_URL,
  51 };
  52
  53 JSONServer::JSONServer (int port)
  54 {
  55         thread* t = new thread (boost::bind (&JSONServer::run, this, port));
  56 #ifdef DCPOMATIC_LINUX
  57         pthread_setname_np (t->native_handle(), "json-server");
  58 #endif
  59 }
  60
  61 void
  62 JSONServer::run (int port)
  63 try
  64 {
  65         boost::asio::io_service io_service;
  66         tcp::acceptor a (io_service, tcp::endpoint (tcp::v4 (), port));
  67         while (true) {
  68                 try {
  69                         shared_ptr<tcp::socket> s (new tcp::socket (io_service));
  70                         a.accept (*s);
  71                         handle (s);
  72                 }
  73                 catch (...) {
  74
  75                 }
  76         }
  77 }
  78 catch (...)
  79 {
  80
  81 }
  82
  83 void
  84 JSONServer::handle (shared_ptr<tcp::socket> socket)
  85 {
  86         string url;
  87         State state = AWAITING_G;
  88
  89         while (true) {
  90                 char data[MAX_LENGTH];
  91                 boost::system::error_code error;
  92                 size_t len = socket->read_some (boost::asio::buffer (data), error);
  93                 if (error) {
  94                         cout << "error.\n";
  95                         break;
  96                 }
  97
  98                 char* p = data;
  99                 char* e = data + len;
 100                 while (p != e) {
 101
 102                         State old_state = state;
 103                         switch (state) {
 104                         case AWAITING_G:
 105                                 if (*p == 'G') {
 106                                         state = AWAITING_E;
 107                                 }
 108                                 break;
 109                         case AWAITING_E:
 110                                 if (*p == 'E') {
 111                                         state = AWAITING_T;
 112                                 }
 113                                 break;
 114                         case AWAITING_T:
 115                                 if (*p == 'T') {
 116                                         state = AWAITING_SPACE;
 117                                 }
 118                                 break;
 119                         case AWAITING_SPACE:
 120                                 if (*p == ' ') {
 121                                         state = READING_URL;
 122                                 }
 123                                 break;
 124                         case READING_URL:
 125                                 if (*p == ' ') {
 126                                         request (url, socket);
 127                                         state = AWAITING_G;
 128                                         url = "";
 129                                 } else {
 130                                         url += *p;
 131                                 }
 132                                 break;
 133                         }
 134
 135                         if (state == old_state && state != READING_URL) {
 136                                 state = AWAITING_G;
 137                         }
 138
 139                         ++p;
 140                 }
 141         }
 142 }
 143
 144 void
 145 JSONServer::request (string url, shared_ptr<tcp::socket> socket)
 146 {
 147         cout << "request: " << url << "\n";
 148
 149         map<string, string> r = split_get_request (url);
 150         for (map<string, string>::iterator i = r.begin(); i != r.end(); ++i) {
 151                 cout << i->first << " => " << i->second << "\n";
 152         }
 153
 154         string action;
 155         if (r.find ("action") != r.end ()) {
 156                 action = r["action"];
 157         }
 158
 159         string json;
 160         if (action == "status") {
 161
 162                 list<shared_ptr<Job> > jobs = JobManager::instance()->get ();
 163
 164                 json += "{ \"jobs\": [";
 165                 for (list<shared_ptr<Job> >::iterator i = jobs.begin(); i != jobs.end(); ++i) {
 166
 167                         json += "{ ";
 168
 169                         if ((*i)->film()) {
 170                                 json += "\"dcp\": \"" + (*i)->film()->dcp_name() + "\", ";
 171                         }
 172
 173                         json += "\"name\": \"" + (*i)->json_name() + "\", ";
 174                         if ((*i)->progress ()) {
 175                                 json += "\"progress\": " + raw_convert<string>((*i)->progress().get()) + ", ";
 176                         } else {
 177                                 json += "\"progress\": unknown, ";
 178                         }
 179                         json += "\"status\": \"" + (*i)->json_status() + "\"";
 180                         json += " }";
 181
 182                         list<shared_ptr<Job> >::iterator j = i;
 183                         ++j;
 184                         if (j != jobs.end ()) {
 185                                 json += ", ";
 186                         }
 187                 }
 188                 json += "] }";
 189         }
 190
 191         string reply = "HTTP/1.1 200 OK\r\n"
 192                 "Content-Length: " + raw_convert<string>(json.length()) + "\r\n"
 193                 "Content-Type: application/json\r\n"
 194                 "\r\n"
 195                 + json + "\r\n";
 196         cout << "reply: " << json << "\n";
 197         boost::asio::write (*socket, boost::asio::buffer (reply.c_str(), reply.length()));
 198 }