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 <boost/asio.hpp>
  22 #include <boost/bind.hpp>
  23 #include <boost/thread.hpp>
  24 #include "json_server.h"
  25 #include "job_manager.h"
  26 #include "job.h"
  27 #include "util.h"
  28 #include "film.h"
  29 #include "transcode_job.h"
  30 #include <iostream>
  31
  32 using std::string;
  33 using std::cout;
  34 using std::map;
  35 using std::list;
  36 using boost::thread;
  37 using boost::shared_ptr;
  38 using boost::dynamic_pointer_cast;
  39 using boost::asio::ip::tcp;
  40
  41 #define MAX_LENGTH 512
  42
  43 enum State {
  44         AWAITING_G,
  45         AWAITING_E,
  46         AWAITING_T,
  47         AWAITING_SPACE,
  48         READING_URL,
  49 };
  50
  51 JSONServer::JSONServer (int port)
  52 {
  53         new thread (boost::bind (&JSONServer::run, this, port));
  54 }
  55
  56 void
  57 JSONServer::run (int port)
  58 try
  59 {
  60         boost::asio::io_service io_service;
  61         tcp::acceptor a (io_service, tcp::endpoint (tcp::v4 (), port));
  62         while (true) {
  63                 try {
  64                         shared_ptr<tcp::socket> s (new tcp::socket (io_service));
  65                         a.accept (*s);
  66                         handle (s);
  67                 }
  68                 catch (...) {
  69
  70                 }
  71         }
  72 }
  73 catch (...)
  74 {
  75
  76 }
  77
  78 void
  79 JSONServer::handle (shared_ptr<tcp::socket> socket)
  80 {
  81         string url;
  82         State state = AWAITING_G;
  83
  84         while (true) {
  85                 char data[MAX_LENGTH];
  86                 boost::system::error_code error;
  87                 size_t len = socket->read_some (boost::asio::buffer (data), error);
  88                 if (error) {
  89                         cout << "error.\n";
  90                         break;
  91                 }
  92
  93                 char* p = data;
  94                 char* e = data + len;
  95                 while (p != e) {
  96
  97                         State old_state = state;
  98                         switch (state) {
  99                         case AWAITING_G:
 100                                 if (*p == 'G') {
 101                                         state = AWAITING_E;
 102                                 }
 103                                 break;
 104                         case AWAITING_E:
 105                                 if (*p == 'E') {
 106                                         state = AWAITING_T;
 107                                 }
 108                                 break;
 109                         case AWAITING_T:
 110                                 if (*p == 'T') {
 111                                         state = AWAITING_SPACE;
 112                                 }
 113                                 break;
 114                         case AWAITING_SPACE:
 115                                 if (*p == ' ') {
 116                                         state = READING_URL;
 117                                 }
 118                                 break;
 119                         case READING_URL:
 120                                 if (*p == ' ') {
 121                                         request (url, socket);
 122                                         state = AWAITING_G;
 123                                         url = "";
 124                                 } else {
 125                                         url += *p;
 126                                 }
 127                                 break;
 128                         }
 129
 130                         if (state == old_state && state != READING_URL) {
 131                                 state = AWAITING_G;
 132                         }
 133
 134                         ++p;
 135                 }
 136         }
 137 }
 138
 139 void
 140 JSONServer::request (string url, shared_ptr<tcp::socket> socket)
 141 {
 142         cout << "request: " << url << "\n";
 143
 144         map<string, string> r = split_get_request (url);
 145         for (map<string, string>::iterator i = r.begin(); i != r.end(); ++i) {
 146                 cout << i->first << " => " << i->second << "\n";
 147         }
 148
 149         string action;
 150         if (r.find ("action") != r.end ()) {
 151                 action = r["action"];
 152         }
 153
 154         SafeStringStream json;
 155         if (action == "status") {
 156
 157                 list<shared_ptr<Job> > jobs = JobManager::instance()->get ();
 158
 159                 json << "{ \"jobs\": [";
 160                 for (list<shared_ptr<Job> >::iterator i = jobs.begin(); i != jobs.end(); ++i) {
 161
 162                         json << "{ ";
 163
 164                         if ((*i)->film()) {
 165                                 json << "\"dcp\": \"" << (*i)->film()->dcp_name() << "\", ";
 166                         }
 167
 168                         json << "\"name\": \""   << (*i)->json_name() << "\", ";
 169                         if ((*i)->progress ()) {
 170                                 json << "\"progress\": " << (*i)->progress().get() << ", ";
 171                         } else {
 172                                 json << "\"progress\": unknown, ";
 173                         }
 174                         json << "\"status\": \"" << (*i)->json_status() << "\"";
 175                         json << " }";
 176
 177                         list<shared_ptr<Job> >::iterator j = i;
 178                         ++j;
 179                         if (j != jobs.end ()) {
 180                                 json << ", ";
 181                         }
 182                 }
 183                 json << "] }";
 184
 185                 if (json.str().empty ()) {
 186                         json << "{ }";
 187                 }
 188         }
 189
 190         SafeStringStream reply;
 191         reply << "HTTP/1.1 200 OK\r\n"
 192               << "Content-Length: " << json.str().length() << "\r\n"
 193               << "Content-Type: application/json\r\n"
 194                               << "\r\n"
 195               << json.str () << "\r\n";
 196         cout << "reply: " << json.str() << "\n";
 197         boost::asio::write (*socket, boost::asio::buffer (reply.str().c_str(), reply.str().length()));
 198 }