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                 send_response(cl, *cl.response);
  66 }
  67
  68 void Server::data_available()
  69 {
  70         Net::StreamSocket *csock = sock.accept();
  71         clients.push_back(Client(csock));
  72         csock->signal_data_available.connect(sigc::bind(sigc::mem_fun(this, &Server::client_data_available), sigc::ref(clients.back())));
  73         csock->signal_end_of_file.connect(sigc::bind(sigc::mem_fun(this, &Server::client_end_of_file), sigc::ref(clients.back())));
  74         if(event_disp)
  75                 event_disp->add(*csock);
  76 }
  77
  78 void Server::client_data_available(Client &cl)
  79 {
  80         for(list<Client>::iterator i=clients.begin(); i!=clients.end(); ++i)
  81                 if(i->stale && &*i!=&cl)
  82                 {
  83                         clients.erase(i);
  84                         break;
  85                 }
  86
  87         char rbuf[4096];
  88         unsigned len = cl.sock->read(rbuf, sizeof(rbuf));
  89         if(cl.stale)
  90                 return;
  91         cl.in_buf.append(rbuf, len);
  92
  93         RefPtr<Response> response;
  94         if(!cl.request)
  95         {
  96                 if(cl.in_buf.find("\r\n\r\n")!=string::npos || cl.in_buf.find("\n\n")!=string::npos)
  97                 {
  98                         try
  99                         {
 100                                 cl.request = new Request(Request::parse(cl.in_buf));
 101
 102                                 string addr_str = cl.sock->get_peer_address().str();
 103                                 unsigned colon = addr_str.find(':');
 104                                 cl.request->set_header("-Client-Host", addr_str.substr(0, colon));
 105
 106                                 if(cl.request->get_method()!="GET" && cl.request->get_method()!="POST")
 107                                 {
 108                                         response = new Response(NOT_IMPLEMENTED);
 109                                         response->add_content("Method not implemented\n");
 110                                 }
 111                                 else if(cl.request->get_path()[0]!='/')
 112                                 {
 113                                         response = new Response(BAD_REQUEST);
 114                                         response->add_content("Path must be absolute\n");
 115                                 }
 116                         }
 117                         catch(const exception &e)
 118                         {
 119                                 response = new Response(BAD_REQUEST);
 120                                 response->add_content(e.what());
 121                         }
 122                         cl.in_buf = string();
 123                 }
 124         }
 125         else
 126         {
 127                 len = cl.request->parse_content(cl.in_buf);
 128                 cl.in_buf.erase(0, len);
 129         }
 130
 131         if(cl.request && cl.request->is_complete() && !response)
 132         {
 133                 cl.keepalive = false;
 134                 if(cl.request->has_header("Connection"))
 135                         cl.keepalive = (cl.request->get_header("Connection")=="keep-alive");
 136
 137                 response = new Response(NONE);
 138                 try
 139                 {
 140                         cl.response = response.get();
 141                         responses[cl.response] = &cl;
 142                         signal_request.emit(*cl.request, *response);
 143                         if(cl.async)
 144                                 response.release();
 145                         else
 146                         {
 147                                 responses.erase(cl.response);
 148                                 cl.response = 0;
 149                                 if(response->get_status()==NONE)
 150                                 {
 151                                         response = new Response(NOT_FOUND);
 152                                         response->add_content("The requested resource was not found\n");
 153                                 }
 154                         }
 155                 }
 156                 catch(const exception &e)
 157                 {
 158                         responses.erase(cl.response);
 159                         cl.response = 0;
 160                         response = new Response(INTERNAL_ERROR);
 161                         response->add_content(e.what());
 162                 }
 163         }
 164
 165         if(response)
 166                 send_response(cl, *response);
 167 }
 168
 169 void Server::send_response(Client &cl, Response &resp)
 170 {
 171         cl.sock->write(resp.str());
 172         cl.async = false;
 173         if(cl.keepalive)
 174         {
 175                 delete cl.request;
 176                 cl.request = 0;
 177                 delete cl.response;
 178                 cl.response = 0;
 179         }
 180         else
 181         {
 182                 cl.sock->shutdown(IO::M_WRITE);
 183                 cl.stale = true;
 184         }
 185 }
 186
 187 void Server::client_end_of_file(Client &cl)
 188 {
 189         cl.stale = true;
 190 }
 191
 192 Server::Client &Server::get_client_by_response(Response &resp)
 193 {
 194         return *get_item(responses, &resp);
 195 }
 196
 197
 198 Server::Client::Client(RefPtr<Net::StreamSocket> s):
 199         sock(s),
 200         request(0),
 201         response(0),
 202         keepalive(false),
 203         async(false),
 204         stale(false)
 205 { }
 206
 207 Server::Client::~Client()
 208 {
 209         delete request;
 210         delete response;
 211 }
 212
 213 } // namespace Http
 214 } // namespace Msp