src/lib/json_server.cc

   1 /*
   2     Copyright (C) 2014-2015 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 <boost/asio.hpp>
  21 #include <boost/bind.hpp>
  22 #include <boost/thread.hpp>
  23 #include "json_server.h"
  24 #include "job_manager.h"
  25 #include "job.h"
  26 #include "util.h"
  27 #include "film.h"
  28 #include "transcode_job.h"
  29
  30 using std::string;
  31 using std::stringstream;
  32 using std::cout;
  33 using std::map;
  34 using std::list;
  35 using boost::thread;
  36 using boost::shared_ptr;
  37 using boost::dynamic_pointer_cast;
  38 using boost::asio::ip::tcp;
  39
  40 #define MAX_LENGTH 512
  41
  42 enum State {
  43         AWAITING_G,
  44         AWAITING_E,
  45         AWAITING_T,
  46         AWAITING_SPACE,
  47         READING_URL,
  48 };
  49
  50 JSONServer::JSONServer (int port)
  51 {
  52         new thread (boost::bind (&JSONServer::run, this, port));
  53 }
  54
  55 void
  56 JSONServer::run (int port)
  57 try
  58 {
  59         boost::asio::io_service io_service;
  60         tcp::acceptor a (io_service, tcp::endpoint (tcp::v4 (), port));
  61         while (true) {
  62                 try {
  63                         shared_ptr<tcp::socket> s (new tcp::socket (io_service));
  64                         a.accept (*s);
  65                         handle (s);
  66                 }
  67                 catch (...) {
  68
  69                 }
  70         }
  71 }
  72 catch (...)
  73 {
  74
  75 }
  76
  77 void
  78 JSONServer::handle (shared_ptr<tcp::socket> socket)
  79 {
  80         string url;
  81         State state = AWAITING_G;
  82
  83         while (true) {
  84                 char data[MAX_LENGTH];
  85                 boost::system::error_code error;
  86                 size_t len = socket->read_some (boost::asio::buffer (data), error);
  87                 if (error) {
  88                         cout << "error.\n";
  89                         break;
  90                 }
  91
  92                 char* p = data;
  93                 char* e = data + len;
  94                 while (p != e) {
  95
  96                         State old_state = state;
  97                         switch (state) {
  98                         case AWAITING_G:
  99                                 if (*p == 'G') {
 100                                         state = AWAITING_E;
 101                                 }
 102                                 break;
 103                         case AWAITING_E:
 104                                 if (*p == 'E') {
 105                                         state = AWAITING_T;
 106                                 }
 107                                 break;
 108                         case AWAITING_T:
 109                                 if (*p == 'T') {
 110                                         state = AWAITING_SPACE;
 111                                 }
 112                                 break;
 113                         case AWAITING_SPACE:
 114                                 if (*p == ' ') {
 115                                         state = READING_URL;
 116                                 }
 117                                 break;
 118                         case READING_URL:
 119                                 if (*p == ' ') {
 120                                         request (url, socket);
 121                                         state = AWAITING_G;
 122                                         url = "";
 123                                 } else {
 124                                         url += *p;
 125                                 }
 126                                 break;
 127                         }
 128
 129                         if (state == old_state && state != READING_URL) {
 130                                 state = AWAITING_G;
 131                         }
 132
 133                         ++p;
 134                 }
 135         }
 136 }
 137
 138 void
 139 JSONServer::request (string url, shared_ptr<tcp::socket> socket)
 140 {
 141         cout << "request: " << url << "\n";
 142
 143         map<string, string> r = split_get_request (url);
 144         for (map<string, string>::iterator i = r.begin(); i != r.end(); ++i) {
 145                 cout << i->first << " => " << i->second << "\n";
 146         }
 147
 148         string action;
 149         if (r.find ("action") != r.end ()) {
 150                 action = r["action"];
 151         }
 152
 153         stringstream json;
 154         if (action == "status") {
 155
 156                 list<shared_ptr<Job> > jobs = JobManager::instance()->get ();
 157
 158                 json << "{ \"jobs\": [";
 159                 for (list<shared_ptr<Job> >::iterator i = jobs.begin(); i != jobs.end(); ++i) {
 160
 161                         json << "{ ";
 162
 163                         if ((*i)->film()) {
 164                                 json << "\"dcp\": \"" << (*i)->film()->dcp_name() << "\", ";
 165                         }
 166
 167                         json << "\"name\": \""   << (*i)->json_name() << "\", ";
 168                         if ((*i)->progress ()) {
 169                                 json << "\"progress\": " << (*i)->progress().get() << ", ";
 170                         } else {
 171                                 json << "\"progress\": unknown, ";
 172                         }
 173                         json << "\"status\": \"" << (*i)->json_status() << "\"";
 174                         json << " }";
 175
 176                         list<shared_ptr<Job> >::iterator j = i;
 177                         ++j;
 178                         if (j != jobs.end ()) {
 179                                 json << ", ";
 180                         }
 181                 }
 182                 json << "] }";
 183
 184                 if (json.str().empty ()) {
 185                         json << "{ }";
 186                 }
 187         }
 188
 189         stringstream reply;
 190         reply << "HTTP/1.1 200 OK\r\n"
 191               << "Content-Length: " << json.str().length() << "\r\n"
 192               << "Content-Type: application/json\r\n"
 193                               << "\r\n"
 194               << json.str () << "\r\n";
 195         cout << "reply: " << json.str() << "\n";
 196         boost::asio::write (*socket, boost::asio::buffer (reply.str().c_str(), reply.str().length()));
 197 }