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