source/http/server.cpp

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