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