source/http/server.cpp

   1 #include "server.h"
   2 #include <exception>
   3 #include <typeinfo>
   4 #include <msp/core/maputils.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
  14 using namespace std;
  15
  16 namespace Msp {
  17 namespace Http {
  18
  19 Server::Server():
  20         sock(Net::INET6)
  21 { }
  22
  23 Server::Server(unsigned port):
  24         sock(Net::INET6)
  25 {
  26         listen(port);
  27 }
  28
  29 // Avoid emitting sigc::signal destructor in files including server.h
  30 Server::~Server()
  31 {
  32 }
  33
  34 void Server::listen(unsigned port)
  35 {
  36         unique_ptr<Net::SockAddr> addr(Net::resolve("*", format("%d", port), Net::INET6));
  37         sock.listen(*addr, 8);
  38         sock.signal_data_available.connect(sigc::mem_fun(this, &Server::data_available));
  39 }
  40
  41 unsigned Server::get_port() const
  42 {
  43         const Net::SockAddr &addr = sock.get_local_address();
  44         if(addr.get_family()==Net::INET)
  45                 return static_cast<const Net::InetAddr &>(addr).get_port();
  46         return 0;
  47 }
  48
  49 void Server::use_event_dispatcher(IO::EventDispatcher *ed)
  50 {
  51         if(event_disp)
  52         {
  53                 event_disp->remove(sock);
  54                 for(Client &c: clients)
  55                         event_disp->remove(*c.sock);
  56         }
  57         event_disp = ed;
  58         if(event_disp)
  59         {
  60                 event_disp->add(sock);
  61                 for(Client &c: clients)
  62                         event_disp->add(*c.sock);
  63         }
  64 }
  65
  66 void Server::delay_response(Response &resp)
  67 {
  68         get_client_by_response(resp).async = true;
  69 }
  70
  71 void Server::submit_response(Response &resp)
  72 {
  73         Client &cl = get_client_by_response(resp);
  74         if(cl.async)
  75                 send_response(cl, *cl.response);
  76 }
  77
  78 void Server::cancel_keepalive(Response &resp)
  79 {
  80         get_client_by_response(resp).keepalive = false;
  81 }
  82
  83 void Server::close_connections(const Time::TimeDelta &timeout)
  84 {
  85         IO::Poller poller;
  86         for(Client &c: clients)
  87         {
  88                 c.sock->shutdown(IO::M_WRITE);
  89                 poller.set_object(*c.sock, IO::P_INPUT);
  90         }
  91
  92         while(!clients.empty() && poller.poll(timeout))
  93         {
  94                 for(const IO::Poller::PolledObject &p: poller.get_result())
  95                         for(auto j=clients.begin(); j!=clients.end(); ++j)
  96                                 if(j->sock.get()==p.object)
  97                                 {
  98                                         poller.set_object(*j->sock, IO::P_NONE);
  99                                         clients.erase(j);
 100                                         break;
 101                                 }
 102         }
 103 }
 104
 105 void Server::data_available()
 106 {
 107         unique_ptr<Net::StreamSocket> csock(sock.accept());
 108         clients.emplace_back(move(csock));
 109         Client &cl = clients.back();
 110         cl.sock->signal_data_available.connect(sigc::bind(sigc::mem_fun(this, &Server::client_data_available), sigc::ref(clients.back())));
 111         cl.sock->signal_end_of_file.connect(sigc::bind(sigc::mem_fun(this, &Server::client_end_of_file), sigc::ref(clients.back())));
 112         if(event_disp)
 113                 event_disp->add(*cl.sock);
 114 }
 115
 116 void Server::client_data_available(Client &cl)
 117 {
 118         for(auto i=clients.begin(); i!=clients.end(); ++i)
 119                 if(i->stale && &*i!=&cl)
 120                 {
 121                         clients.erase(i);
 122                         break;
 123                 }
 124
 125         try
 126         {
 127                 char rbuf[4096];
 128                 unsigned len = cl.sock->read(rbuf, sizeof(rbuf));
 129                 if(cl.stale)
 130                         return;
 131                 cl.in_buf.append(rbuf, len);
 132         }
 133         catch(const exception &)
 134         {
 135                 cl.stale = true;
 136                 return;
 137         }
 138
 139         unique_ptr<Response> response;
 140         if(!cl.request)
 141         {
 142                 if(cl.in_buf.find("\r\n\r\n")!=string::npos || cl.in_buf.find("\n\n")!=string::npos)
 143                 {
 144                         try
 145                         {
 146                                 cl.request = make_unique<Request>(Request::parse(cl.in_buf));
 147
 148                                 string addr_str = cl.sock->get_peer_address().str();
 149                                 string::size_type colon = addr_str.find(':', (addr_str[0]=='[' ? addr_str.find(']')+1 : 0));
 150                                 cl.request->set_header("-Client-Host", addr_str.substr(0, colon));
 151
 152                                 if(cl.request->get_method()!="GET" && cl.request->get_method()!="POST")
 153                                 {
 154                                         response = make_unique<Response>(NOT_IMPLEMENTED);
 155                                         response->add_content("Method not implemented\n");
 156                                 }
 157                                 else if(cl.request->get_path()[0]!='/')
 158                                 {
 159                                         response = make_unique<Response>(BAD_REQUEST);
 160                                         response->add_content("Path must be absolute\n");
 161                                 }
 162                         }
 163                         catch(const exception &e)
 164                         {
 165                                 response = make_unique<Response>(BAD_REQUEST);
 166                                 response->add_content(format("An error occurred while parsing request headers:\ntype: %s\nwhat: %s",
 167                                         Debug::demangle(typeid(e).name()), e.what()));
 168                         }
 169                         cl.in_buf = string();
 170                 }
 171         }
 172         else
 173         {
 174                 unsigned len = cl.request->parse_content(cl.in_buf);
 175                 cl.in_buf.erase(0, len);
 176         }
 177
 178         if(cl.request && cl.request->is_complete() && !response)
 179         {
 180                 cl.keepalive = false;
 181                 if(cl.request->has_header("Connection"))
 182                         cl.keepalive = !strcasecmp(cl.request->get_header("Connection"), "keep-alive");
 183
 184                 response = make_unique<Response>(NONE);
 185                 try
 186                 {
 187                         cl.response = move(response);
 188                         responses[cl.response.get()] = &cl;
 189                         signal_request.emit(*cl.request, *cl.response);
 190                         if(!cl.async)
 191                         {
 192                                 responses.erase(cl.response.get());
 193                                 response = move(cl.response);
 194                                 if(response->get_status()==NONE)
 195                                 {
 196                                         response = make_unique<Response>(NOT_FOUND);
 197                                         response->add_content("The requested resource was not found\n");
 198                                 }
 199                         }
 200                 }
 201                 catch(const exception &e)
 202                 {
 203                         responses.erase(cl.response.get());
 204                         cl.response.reset();
 205                         response = make_unique<Response>(INTERNAL_ERROR);
 206                         response->add_content(format("An error occurred while processing the request:\ntype: %s\nwhat: %s",
 207                                 Debug::demangle(typeid(e).name()), e.what()));
 208                 }
 209         }
 210
 211         if(response)
 212                 send_response(cl, *response);
 213 }
 214
 215 void Server::send_response(Client &cl, Response &resp)
 216 {
 217         if(cl.keepalive)
 218                 resp.set_header("Connection", "keep-alive");
 219
 220         try
 221         {
 222                 cl.sock->write(resp.str());
 223         }
 224         catch(const exception &)
 225         {
 226                 cl.stale = true;
 227                 return;
 228         }
 229
 230         cl.async = false;
 231         if(cl.keepalive)
 232         {
 233                 cl.request.reset();
 234                 cl.response.reset();
 235         }
 236         else
 237         {
 238                 cl.sock->shutdown(IO::M_WRITE);
 239                 cl.stale = true;
 240         }
 241 }
 242
 243 void Server::client_end_of_file(Client &cl)
 244 {
 245         cl.stale = true;
 246 }
 247
 248 Server::Client &Server::get_client_by_response(Response &resp)
 249 {
 250         return *get_item(responses, &resp);
 251 }
 252
 253
 254 Server::Client::Client(unique_ptr<Net::StreamSocket> s):
 255         sock(move(s))
 256 { }
 257
 258 } // namespace Http
 259 } // namespace Msp