src/lib/json_server.cc

   1 /*
   2     Copyright (C) 2014-2021 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
  22 #include "film.h"
  23 #include "job.h"
  24 #include "job_manager.h"
  25 #include "json_server.h"
  26 #include "transcode_job.h"
  27 #include <dcp/raw_convert.h>
  28 #include <boost/asio.hpp>
  29 #include <boost/bind/bind.hpp>
  30 #include <boost/thread.hpp>
  31 #include <iostream>
  32
  33
  34 using std::cout;
  35 using std::dynamic_pointer_cast;
  36 using std::list;
  37 using std::make_shared;
  38 using std::map;
  39 using std::shared_ptr;
  40 using std::string;
  41 using boost::asio::ip::tcp;
  42 using boost::thread;
  43 using dcp::raw_convert;
  44
  45
  46 #define MAX_LENGTH 512
  47
  48
  49 enum State {
  50         AWAITING_G,
  51         AWAITING_E,
  52         AWAITING_T,
  53         AWAITING_SPACE,
  54         READING_URL,
  55 };
  56
  57
  58 JSONServer::JSONServer (int port)
  59 {
  60 #ifdef DCPOMATIC_LINUX
  61         auto t = new thread (boost::bind (&JSONServer::run, this, port));
  62         pthread_setname_np (t->native_handle(), "json-server");
  63 #else
  64         new thread (boost::bind (&JSONServer::run, this, port));
  65 #endif
  66 }
  67
  68
  69 void
  70 JSONServer::run (int port)
  71 try
  72 {
  73         boost::asio::io_service io_service;
  74         tcp::acceptor a (io_service, tcp::endpoint (tcp::v4 (), port));
  75         while (true) {
  76                 try {
  77                         auto s = make_shared<tcp::socket>(io_service);
  78                         a.accept (*s);
  79                         handle (s);
  80                 }
  81                 catch (...) {
  82
  83                 }
  84         }
  85 }
  86 catch (...)
  87 {
  88
  89 }
  90
  91
  92 void
  93 JSONServer::handle (shared_ptr<tcp::socket> socket)
  94 {
  95         string url;
  96         State state = AWAITING_G;
  97
  98         while (true) {
  99                 char data[MAX_LENGTH];
 100                 boost::system::error_code error;
 101                 size_t len = socket->read_some (boost::asio::buffer (data), error);
 102                 if (error) {
 103                         cout << "error.\n";
 104                         break;
 105                 }
 106
 107                 auto p = data;
 108                 auto e = data + len;
 109                 while (p != e) {
 110
 111                         auto old_state = state;
 112                         switch (state) {
 113                         case AWAITING_G:
 114                                 if (*p == 'G') {
 115                                         state = AWAITING_E;
 116                                 }
 117                                 break;
 118                         case AWAITING_E:
 119                                 if (*p == 'E') {
 120                                         state = AWAITING_T;
 121                                 }
 122                                 break;
 123                         case AWAITING_T:
 124                                 if (*p == 'T') {
 125                                         state = AWAITING_SPACE;
 126                                 }
 127                                 break;
 128                         case AWAITING_SPACE:
 129                                 if (*p == ' ') {
 130                                         state = READING_URL;
 131                                 }
 132                                 break;
 133                         case READING_URL:
 134                                 if (*p == ' ') {
 135                                         request (url, socket);
 136                                         state = AWAITING_G;
 137                                         url = "";
 138                                 } else {
 139                                         url += *p;
 140                                 }
 141                                 break;
 142                         }
 143
 144                         if (state == old_state && state != READING_URL) {
 145                                 state = AWAITING_G;
 146                         }
 147
 148                         ++p;
 149                 }
 150         }
 151 }
 152
 153
 154 map<string, string>
 155 split_get_request(string url)
 156 {
 157         enum {
 158                 AWAITING_QUESTION_MARK,
 159                 KEY,
 160                 VALUE
 161         } state = AWAITING_QUESTION_MARK;
 162
 163         map<string, string> r;
 164         string k;
 165         string v;
 166         for (size_t i = 0; i < url.length(); ++i) {
 167                 switch (state) {
 168                 case AWAITING_QUESTION_MARK:
 169                         if (url[i] == '?') {
 170                                 state = KEY;
 171                         }
 172                         break;
 173                 case KEY:
 174                         if (url[i] == '=') {
 175                                 v.clear();
 176                                 state = VALUE;
 177                         } else {
 178                                 k += url[i];
 179                         }
 180                         break;
 181                 case VALUE:
 182                         if (url[i] == '&') {
 183                                 r.insert(make_pair(k, v));
 184                                 k.clear ();
 185                                 state = KEY;
 186                         } else {
 187                                 v += url[i];
 188                         }
 189                         break;
 190                 }
 191         }
 192
 193         if (state == VALUE) {
 194                 r.insert (make_pair (k, v));
 195         }
 196
 197         return r;
 198 }
 199
 200
 201 void
 202 JSONServer::request (string url, shared_ptr<tcp::socket> socket)
 203 {
 204         cout << "request: " << url << "\n";
 205
 206         auto r = split_get_request (url);
 207         for (auto const& i: r) {
 208                 cout << i.first << " => " << i.second << "\n";
 209         }
 210
 211         string action;
 212         if (r.find ("action") != r.end ()) {
 213                 action = r["action"];
 214         }
 215
 216         string json;
 217         if (action == "status") {
 218
 219                 auto jobs = JobManager::instance()->get();
 220
 221                 json += "{ \"jobs\": [";
 222                 for (auto i = jobs.cbegin(); i != jobs.cend(); ++i) {
 223                         json += "{ ";
 224
 225                         if ((*i)->film()) {
 226                                 json += "\"dcp\": \"" + (*i)->film()->dcp_name() + "\", ";
 227                         }
 228
 229                         json += "\"name\": \"" + (*i)->json_name() + "\", ";
 230                         if ((*i)->progress()) {
 231                                 json += "\"progress\": " + raw_convert<string>((*i)->progress().get()) + ", ";
 232                         } else {
 233                                 json += "\"progress\": unknown, ";
 234                         }
 235                         json += "\"status\": \"" + (*i)->json_status() + "\"";
 236                         json += " }";
 237
 238                         auto j = i;
 239                         ++j;
 240                         if (j != jobs.end ()) {
 241                                 json += ", ";
 242                         }
 243                 }
 244                 json += "] }";
 245         }
 246
 247         string reply = "HTTP/1.1 200 OK\r\n"
 248                 "Content-Length: " + raw_convert<string>(json.length()) + "\r\n"
 249                 "Content-Type: application/json\r\n"
 250                 "\r\n"
 251                 + json + "\r\n";
 252         cout << "reply: " << json << "\n";
 253         boost::asio::write (*socket, boost::asio::buffer(reply.c_str(), reply.length()));
 254 }