source/http/server.cpp

   1 #include <exception>
   2 #include <typeinfo>
   3 #include <msp/core/maputils.h>
   4 #include <msp/core/refptr.h>
   5 #include <msp/debug/demangle.h>
   6 #include <msp/net/inet.h>
   7 #include <msp/net/resolve.h>
   8 #include <msp/net/streamsocket.h>
   9 #include <msp/strings/format.h>
  10 #include <msp/strings/utils.h>
  11 #include "request.h"
  12 #include "response.h"
  13 #include "server.h"
  14
  15 using namespace std;
  16
  17 namespace Msp {
  18 namespace Http {
  19
  20 Server::Server():
  21         sock(Net::INET6),
  22         event_disp(0)
  23 { }
  24
  25 Server::Server(unsigned port):
  26         sock(Net::INET6),
  27         event_disp(0)
  28 {
  29         listen(port);
  30 }
  31
  32 // Avoid emitting sigc::signal destructor in files including server.h
  33 Server::~Server()
  34 {
  35 }
  36
  37 void Server::listen(unsigned port)
  38 {
  39         RefPtr<Net::SockAddr> addr = Net::resolve("*", format("%d", port), Net::INET6);
  40         sock.listen(*addr, 8);
  41         sock.signal_data_available.connect(sigc::mem_fun(this, &Server::data_available));
  42 }
  43
  44 unsigned Server::get_port() const
  45 {
  46         const Net::SockAddr &addr = sock.get_local_address();
  47         if(addr.get_family()==Net::INET)
  48                 return static_cast<const Net::InetAddr &>(addr).get_port();
  49         return 0;
  50 }
  51
  52 void Server::use_event_dispatcher(IO::EventDispatcher *ed)
  53 {
  54         if(event_disp)
  55         {
  56                 event_disp->remove(sock);
  57                 for(list<Client>::iterator i=clients.begin(); i!=clients.end(); ++i)
  58                         event_disp->remove(*i->sock);
  59         }
  60         event_disp = ed;
  61         if(event_disp)
  62         {
  63                 event_disp->add(sock);
  64                 for(list<Client>::iterator i=clients.begin(); i!=clients.end(); ++i)
  65                         event_disp->add(*i->sock);
  66         }
  67 }
  68
  69 void Server::delay_response(Response &resp)
  70 {
  71         get_client_by_response(resp).async = true;
  72 }
  73
  74 void Server::submit_response(Response &resp)
  75 {
  76         Client &cl = get_client_by_response(resp);
  77         if(cl.async)
  78                 send_response(cl, *cl.response);
  79 }
  80
  81 void Server::cancel_keepalive(Response &resp)
  82 {
  83         get_client_by_response(resp).keepalive = false;
  84 }
  85
  86 void Server::data_available()
  87 {
  88         Net::StreamSocket *csock = sock.accept();
  89         clients.push_back(Client(csock));
  90         csock->signal_data_available.connect(sigc::bind(sigc::mem_fun(this, &Server::client_data_available), sigc::ref(clients.back())));
  91         csock->signal_end_of_file.connect(sigc::bind(sigc::mem_fun(this, &Server::client_end_of_file), sigc::ref(clients.back())));
  92         if(event_disp)
  93                 event_disp->add(*csock);
  94 }
  95
  96 void Server::client_data_available(Client &cl)
  97 {
  98         for(list<Client>::iterator i=clients.begin(); i!=clients.end(); ++i)
  99                 if(i->stale && &*i!=&cl)
 100                 {
 101                         clients.erase(i);
 102                         break;
 103                 }
 104
 105         try
 106         {
 107                 char rbuf[4096];
 108                 unsigned len = cl.sock->read(rbuf, sizeof(rbuf));
 109                 if(cl.stale)
 110                         return;
 111                 cl.in_buf.append(rbuf, len);
 112         }
 113         catch(const exception &)
 114         {
 115                 cl.stale = true;
 116                 return;
 117         }
 118
 119         RefPtr<Response> response;
 120         if(!cl.request)
 121         {
 122                 if(cl.in_buf.find("\r\n\r\n")!=string::npos || cl.in_buf.find("\n\n")!=string::npos)
 123                 {
 124                         try
 125                         {
 126                                 cl.request = new Request(Request::parse(cl.in_buf));
 127
 128                                 string addr_str = cl.sock->get_peer_address().str();
 129                                 string::size_type colon = addr_str.find(':');
 130                                 cl.request->set_header("-Client-Host", addr_str.substr(0, colon));
 131
 132                                 if(cl.request->get_method()!="GET" && cl.request->get_method()!="POST")
 133                                 {
 134                                         response = new Response(NOT_IMPLEMENTED);
 135                                         response->add_content("Method not implemented\n");
 136                                 }
 137                                 else if(cl.request->get_path()[0]!='/')
 138                                 {
 139                                         response = new Response(BAD_REQUEST);
 140                                         response->add_content("Path must be absolute\n");
 141                                 }
 142                         }
 143                         catch(const exception &e)
 144                         {
 145                                 response = new Response(BAD_REQUEST);
 146                                 response->add_content(format("An error occurred while parsing request headers:\ntype: %s\nwhat: %s",
 147                                         Debug::demangle(typeid(e).name()), e.what()));
 148                         }
 149                         cl.in_buf = string();
 150                 }
 151         }
 152         else
 153         {
 154                 unsigned len = cl.request->parse_content(cl.in_buf);
 155                 cl.in_buf.erase(0, len);
 156         }
 157
 158         if(cl.request && cl.request->is_complete() && !response)
 159         {
 160                 cl.keepalive = false;
 161                 if(cl.request->has_header("Connection"))
 162                         cl.keepalive = !strcasecmp(cl.request->get_header("Connection"), "keep-alive");
 163
 164                 response = new Response(NONE);
 165                 try
 166                 {
 167                         cl.response = response.get();
 168                         responses[cl.response] = &cl;
 169                         signal_request.emit(*cl.request, *response);
 170                         if(cl.async)
 171                                 response.release();
 172                         else
 173                         {
 174                                 responses.erase(cl.response);
 175                                 cl.response = 0;
 176                                 if(response->get_status()==NONE)
 177                                 {
 178                                         response = new Response(NOT_FOUND);
 179                                         response->add_content("The requested resource was not found\n");
 180                                 }
 181                         }
 182                 }
 183                 catch(const exception &e)
 184                 {
 185                         responses.erase(cl.response);
 186                         cl.response = 0;
 187                         response = new Response(INTERNAL_ERROR);
 188                         response->add_content(format("An error occurred while processing the request:\ntype: %s\nwhat: %s",
 189                                 Debug::demangle(typeid(e).name()), e.what()));
 190                 }
 191         }
 192
 193         if(response)
 194                 send_response(cl, *response);
 195 }
 196
 197 void Server::send_response(Client &cl, Response &resp)
 198 {
 199         if(cl.keepalive)
 200                 resp.set_header("Connection", "keep-alive");
 201
 202         try
 203         {
 204                 cl.sock->write(resp.str());
 205         }
 206         catch(const exception &)
 207         {
 208                 cl.stale = true;
 209                 return;
 210         }
 211
 212         cl.async = false;
 213         if(cl.keepalive)
 214         {
 215                 delete cl.request;
 216                 cl.request = 0;
 217                 delete cl.response;
 218                 cl.response = 0;
 219         }
 220         else
 221         {
 222                 cl.sock->shutdown(IO::M_WRITE);
 223                 cl.stale = true;
 224         }
 225 }
 226
 227 void Server::client_end_of_file(Client &cl)
 228 {
 229         cl.stale = true;
 230 }
 231
 232 Server::Client &Server::get_client_by_response(Response &resp)
 233 {
 234         return *get_item(responses, &resp);
 235 }
 236
 237
 238 Server::Client::Client(RefPtr<Net::StreamSocket> s):
 239         sock(s),
 240         request(0),
 241         response(0),
 242         keepalive(false),
 243         async(false),
 244         stale(false)
 245 { }
 246
 247 Server::Client::~Client()
 248 {
 249         delete request;
 250         delete response;
 251 }
 252
 253 } // namespace Http
 254 } // namespace Msp