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(Client &c: clients)
  58                         event_disp->remove(*c.sock);
  59         }
  60         event_disp = ed;
  61         if(event_disp)
  62         {
  63                 event_disp->add(sock);
  64                 for(Client &c: clients)
  65                         event_disp->add(*c.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::close_connections(const Time::TimeDelta &timeout)
  87 {
  88         IO::Poller poller;
  89         for(Client &c: clients)
  90         {
  91                 c.sock->shutdown(IO::M_WRITE);
  92                 poller.set_object(*c.sock, IO::P_INPUT);
  93         }
  94
  95         while(!clients.empty() && poller.poll(timeout))
  96         {
  97                 for(const IO::Poller::PolledObject &p: poller.get_result())
  98                         for(list<Client>::iterator j=clients.begin(); j!=clients.end(); ++j)
  99                                 if(j->sock.get()==p.object)
 100                                 {
 101                                         poller.set_object(*j->sock, IO::P_NONE);
 102                                         clients.erase(j);
 103                                         break;
 104                                 }
 105         }
 106 }
 107
 108 void Server::data_available()
 109 {
 110         Net::StreamSocket *csock = sock.accept();
 111         clients.push_back(Client(csock));
 112         csock->signal_data_available.connect(sigc::bind(sigc::mem_fun(this, &Server::client_data_available), sigc::ref(clients.back())));
 113         csock->signal_end_of_file.connect(sigc::bind(sigc::mem_fun(this, &Server::client_end_of_file), sigc::ref(clients.back())));
 114         if(event_disp)
 115                 event_disp->add(*csock);
 116 }
 117
 118 void Server::client_data_available(Client &cl)
 119 {
 120         for(list<Client>::iterator i=clients.begin(); i!=clients.end(); ++i)
 121                 if(i->stale && &*i!=&cl)
 122                 {
 123                         clients.erase(i);
 124                         break;
 125                 }
 126
 127         try
 128         {
 129                 char rbuf[4096];
 130                 unsigned len = cl.sock->read(rbuf, sizeof(rbuf));
 131                 if(cl.stale)
 132                         return;
 133                 cl.in_buf.append(rbuf, len);
 134         }
 135         catch(const exception &)
 136         {
 137                 cl.stale = true;
 138                 return;
 139         }
 140
 141         RefPtr<Response> response;
 142         if(!cl.request)
 143         {
 144                 if(cl.in_buf.find("\r\n\r\n")!=string::npos || cl.in_buf.find("\n\n")!=string::npos)
 145                 {
 146                         try
 147                         {
 148                                 cl.request = new Request(Request::parse(cl.in_buf));
 149
 150                                 string addr_str = cl.sock->get_peer_address().str();
 151                                 string::size_type colon = addr_str.find(':');
 152                                 cl.request->set_header("-Client-Host", addr_str.substr(0, colon));
 153
 154                                 if(cl.request->get_method()!="GET" && cl.request->get_method()!="POST")
 155                                 {
 156                                         response = new Response(NOT_IMPLEMENTED);
 157                                         response->add_content("Method not implemented\n");
 158                                 }
 159                                 else if(cl.request->get_path()[0]!='/')
 160                                 {
 161                                         response = new Response(BAD_REQUEST);
 162                                         response->add_content("Path must be absolute\n");
 163                                 }
 164                         }
 165                         catch(const exception &e)
 166                         {
 167                                 response = new Response(BAD_REQUEST);
 168                                 response->add_content(format("An error occurred while parsing request headers:\ntype: %s\nwhat: %s",
 169                                         Debug::demangle(typeid(e).name()), e.what()));
 170                         }
 171                         cl.in_buf = string();
 172                 }
 173         }
 174         else
 175         {
 176                 unsigned len = cl.request->parse_content(cl.in_buf);
 177                 cl.in_buf.erase(0, len);
 178         }
 179
 180         if(cl.request && cl.request->is_complete() && !response)
 181         {
 182                 cl.keepalive = false;
 183                 if(cl.request->has_header("Connection"))
 184                         cl.keepalive = !strcasecmp(cl.request->get_header("Connection"), "keep-alive");
 185
 186                 response = new Response(NONE);
 187                 try
 188                 {
 189                         cl.response = response.get();
 190                         responses[cl.response] = &cl;
 191                         signal_request.emit(*cl.request, *response);
 192                         if(cl.async)
 193                                 response.release();
 194                         else
 195                         {
 196                                 responses.erase(cl.response);
 197                                 cl.response = 0;
 198                                 if(response->get_status()==NONE)
 199                                 {
 200                                         response = new Response(NOT_FOUND);
 201                                         response->add_content("The requested resource was not found\n");
 202                                 }
 203                         }
 204                 }
 205                 catch(const exception &e)
 206                 {
 207                         responses.erase(cl.response);
 208                         cl.response = 0;
 209                         response = new Response(INTERNAL_ERROR);
 210                         response->add_content(format("An error occurred while processing the request:\ntype: %s\nwhat: %s",
 211                                 Debug::demangle(typeid(e).name()), e.what()));
 212                 }
 213         }
 214
 215         if(response)
 216                 send_response(cl, *response);
 217 }
 218
 219 void Server::send_response(Client &cl, Response &resp)
 220 {
 221         if(cl.keepalive)
 222                 resp.set_header("Connection", "keep-alive");
 223
 224         try
 225         {
 226                 cl.sock->write(resp.str());
 227         }
 228         catch(const exception &)
 229         {
 230                 cl.stale = true;
 231                 return;
 232         }
 233
 234         cl.async = false;
 235         if(cl.keepalive)
 236         {
 237                 delete cl.request;
 238                 cl.request = 0;
 239                 delete cl.response;
 240                 cl.response = 0;
 241         }
 242         else
 243         {
 244                 cl.sock->shutdown(IO::M_WRITE);
 245                 cl.stale = true;
 246         }
 247 }
 248
 249 void Server::client_end_of_file(Client &cl)
 250 {
 251         cl.stale = true;
 252 }
 253
 254 Server::Client &Server::get_client_by_response(Response &resp)
 255 {
 256         return *get_item(responses, &resp);
 257 }
 258
 259
 260 Server::Client::Client(RefPtr<Net::StreamSocket> s):
 261         sock(s),
 262         request(0),
 263         response(0),
 264         keepalive(false),
 265         async(false),
 266         stale(false)
 267 { }
 268
 269 Server::Client::~Client()
 270 {
 271         delete request;
 272         delete response;
 273 }
 274
 275 } // namespace Http
 276 } // namespace Msp