git.sesse.net Git - cubemap/blob - udpinput.cpp

   1 #include <assert.h>
   2 #include <errno.h>
   3 #include <poll.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <sys/socket.h>
   7 #include <unistd.h>
   8 #include <string>
   9
  10 #include "acceptor.h"
  11 #include "log.h"
  12 #include "serverpool.h"
  13 #include "state.pb.h"
  14 #include "udpinput.h"
  15 #include "version.h"
  16
  17 using namespace std;
  18
  19 extern ServerPool *servers;
  20
  21 UDPInput::UDPInput(const string &url)
  22         : url(url),
  23           sock(-1)
  24 {
  25         // Should be verified by the caller.
  26         string protocol;
  27         bool ok = parse_url(url, &protocol, &host, &port, &path);
  28         assert(ok);
  29
  30         construct_header();
  31 }
  32
  33 UDPInput::UDPInput(const InputProto &serialized)
  34         : url(serialized.url()),
  35           sock(serialized.sock())
  36 {
  37         // Should be verified by the caller.
  38         string protocol;
  39         bool ok = parse_url(url, &protocol, &host, &port, &path);
  40         assert(ok);
  41
  42         construct_header();
  43 }
  44
  45 InputProto UDPInput::serialize() const
  46 {
  47         InputProto serialized;
  48         serialized.set_url(url);
  49         serialized.set_sock(sock);
  50         return serialized;
  51 }
  52
  53 void UDPInput::close_socket()
  54 {
  55         int ret;
  56         do {
  57                 ret = close(sock);
  58         } while (ret == -1 && errno == EINTR);
  59
  60         if (ret == -1) {
  61                 log_perror("close()");
  62         }
  63
  64         sock = -1;
  65 }
  66
  67 void UDPInput::construct_header()
  68 {
  69         http_header =
  70                 "HTTP/1.0 200 OK\r\n"
  71                 "Content-type: application/octet-stream\r\n"
  72                 "Cache-control: no-cache\r\n"
  73                 "Server: " SERVER_IDENTIFICATION "\r\n";
  74 }
  75
  76 void UDPInput::add_destination(const string &stream_id)
  77 {
  78         stream_ids.push_back(stream_id);
  79         servers->set_header(stream_id, http_header, "");
  80 }
  81
  82 void UDPInput::do_work()
  83 {
  84         while (!should_stop) {
  85                 if (sock == -1) {
  86                         int port_num = atoi(port.c_str());
  87                         sock = create_server_socket(port_num, UDP_SOCKET);
  88                         if (sock == -1) {
  89                                 log(WARNING, "[%s] UDP socket creation failed. Waiting 0.2 seconds and trying again...",
  90                                              url.c_str());
  91                                 usleep(200000);
  92                                 continue;
  93                         }
  94                 }
  95
  96                 // Since we are non-blocking, we need to wait for the right state first.
  97                 // Wait up to 50 ms, then check should_stop.
  98                 pollfd pfd;
  99                 pfd.fd = sock;
 100                 pfd.events = POLLIN;
 101
 102                 int nfds = poll(&pfd, 1, 50);
 103                 if (nfds == 0 || (nfds == -1 && errno == EINTR)) {
 104                         continue;
 105                 }
 106                 if (nfds == -1) {
 107                         log_perror("poll");
 108                         close_socket();
 109                         continue;
 110                 }
 111
 112                 char buf[4096];
 113                 int ret;
 114                 do {
 115                         ret = recv(sock, buf, sizeof(buf), 0);
 116                 } while (ret == -1 && errno == EINTR);
 117
 118                 if (ret <= 0) {
 119                         log_perror("recv");
 120                         close_socket();
 121                         continue;
 122                 }
 123
 124                 for (size_t i = 0; i < stream_ids.size(); ++i) {
 125                         servers->add_data(stream_ids[i], buf, ret);
 126                 }
 127         }
 128 }