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