source/http/client.cpp

   1 #include <msp/core/except.h>
   2 #include <msp/core/refptr.h>
   3 #include <msp/net/resolve.h>
   4 #include <msp/time/units.h>
   5 #include "client.h"
   6 #include "request.h"
   7 #include "response.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace Http {
  13
  14 Client::Client():
  15         sock(0),
  16         event_disp(0),
  17         user_agent("libmsphttp/0.1"),
  18         request(0),
  19         response(0)
  20 { }
  21
  22 Client::~Client()
  23 {
  24         delete sock;
  25         delete request;
  26         delete response;
  27 }
  28
  29 void Client::use_event_dispatcher(IO::EventDispatcher *ed)
  30 {
  31         if(event_disp && sock)
  32                 event_disp->remove(*sock);
  33         event_disp = ed;
  34         if(event_disp && sock)
  35                 event_disp->add(*sock);
  36 }
  37
  38 void Client::start_request(const Request &r)
  39 {
  40         if(request)
  41                 throw InvalidState("Already processing a request");
  42
  43         string host = r.get_header("Host");
  44         if(host.find(':')==string::npos)
  45                 host += ":80";
  46         RefPtr<Net::SockAddr> addr = Net::resolve(host);
  47
  48         delete sock;
  49         sock = new Net::StreamSocket(addr->get_family());
  50         sock->set_block(false);
  51
  52         sock->signal_data_available.connect(sigc::mem_fun(this, &Client::data_available));
  53         sock->signal_connect_finished.connect(sigc::mem_fun(this, &Client::connect_finished));
  54         if(event_disp)
  55                 event_disp->add(*sock);
  56
  57         sock->connect(*addr);
  58
  59         request = new Request(r);
  60         if(!user_agent.empty())
  61                 request->set_header("User-Agent", user_agent);
  62
  63         delete response;
  64         response = 0;
  65         in_buf.clear();
  66 }
  67
  68 const Response *Client::get_url(const std::string &url)
  69 {
  70         start_request(Request::from_url(url));
  71         wait_response();
  72         return response;
  73 }
  74
  75 void Client::tick()
  76 {
  77         if(!request)
  78                 return;
  79
  80         while(IO::PollEvent ev = IO::poll(*sock, sock->get_events(), Time::zero))
  81                 sock->event(ev);
  82
  83         if(response && response->is_complete())
  84         {
  85                 signal_response_complete.emit(*response);
  86
  87                 delete sock;
  88                 sock = 0;
  89                 delete request;
  90                 request = 0;
  91         }
  92 }
  93
  94 void Client::wait_response()
  95 {
  96         while(request && (!response || !response->is_complete()))
  97                 tick();
  98 }
  99
 100 void Client::abort()
 101 {
 102         delete sock;
 103         sock = 0;
 104         delete request;
 105         request = 0;
 106 }
 107
 108 void Client::connect_finished(const exception *err)
 109 {
 110         if(err)
 111         {
 112                 signal_socket_error.emit(err);
 113
 114                 delete request;
 115                 request = 0;
 116         }
 117         else
 118                 sock->write(request->str());
 119 }
 120
 121 void Client::data_available()
 122 {
 123         char rbuf[4096];
 124         unsigned len;
 125         try
 126         {
 127                 len = sock->read(rbuf, sizeof(rbuf));
 128         }
 129         catch(const exception &e)
 130         {
 131                 signal_socket_error.emit(&e);
 132                 return;
 133         }
 134
 135         if(!len)
 136                 return;
 137         in_buf.append(rbuf, len);
 138
 139         if(!response)
 140         {
 141                 if(in_buf.find("\r\n\r\n")!=string::npos || in_buf.find("\n\n")!=string::npos)
 142                 {
 143                         response = new Response(Response::parse(in_buf));
 144                         response->set_user_data(request->get_user_data());
 145                         in_buf = string();
 146                 }
 147         }
 148         else
 149         {
 150                 len = response->parse_content(in_buf);
 151                 in_buf.erase(0, len);
 152         }
 153
 154         if(response && response->is_complete())
 155         {
 156                 signal_response_complete.emit(*response);
 157
 158                 delete request;
 159                 request = 0;
 160         }
 161 }
 162
 163 } // namespace Http
 164 } // namespace Msp