src/lib/json_server.cc

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