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

   1 #include <assert.h>
   2 #include <errno.h>
   3 #include <poll.h>
   4 #include <stddef.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 "mutexlock.h"
  13 #include "serverpool.h"
  14 #include "state.pb.h"
  15 #include "udpinput.h"
  16 #include "util.h"
  17 #include "version.h"
  18
  19 using namespace std;
  20
  21 extern ServerPool *servers;
  22
  23 UDPInput::UDPInput(const string &url)
  24         : url(url),
  25           sock(-1)
  26 {
  27         // Should be verified by the caller.
  28         string protocol;
  29         bool ok = parse_url(url, &protocol, &host, &port, &path);
  30         assert(ok);
  31
  32         construct_header();
  33
  34         pthread_mutex_init(&stats_mutex, NULL);
  35         stats.url = url;
  36         stats.bytes_received = 0;
  37         stats.data_bytes_received = 0;
  38 }
  39
  40 UDPInput::UDPInput(const InputProto &serialized)
  41         : url(serialized.url()),
  42           sock(serialized.sock())
  43 {
  44         // Should be verified by the caller.
  45         string protocol;
  46         bool ok = parse_url(url, &protocol, &host, &port, &path);
  47         assert(ok);
  48
  49         construct_header();
  50
  51         pthread_mutex_init(&stats_mutex, NULL);
  52         stats.url = url;
  53         stats.bytes_received = serialized.bytes_received();
  54         stats.data_bytes_received = serialized.data_bytes_received();
  55 }
  56
  57 InputProto UDPInput::serialize() const
  58 {
  59         InputProto serialized;
  60         serialized.set_url(url);
  61         serialized.set_sock(sock);
  62         serialized.set_bytes_received(stats.bytes_received);
  63         serialized.set_data_bytes_received(stats.data_bytes_received);
  64         return serialized;
  65 }
  66
  67 void UDPInput::close_socket()
  68 {
  69         safe_close(sock);
  70         sock = -1;
  71 }
  72
  73 void UDPInput::construct_header()
  74 {
  75         http_header =
  76                 "HTTP/1.0 200 OK\r\n"
  77                 "Content-type: application/octet-stream\r\n"
  78                 "Cache-control: no-cache\r\n"
  79                 "Server: " SERVER_IDENTIFICATION "\r\n"
  80                 "Connection: close\r\n";
  81 }
  82
  83 void UDPInput::add_destination(int stream_index)
  84 {
  85         stream_indices.push_back(stream_index);
  86         servers->set_header(stream_index, http_header, "");
  87 }
  88
  89 void UDPInput::do_work()
  90 {
  91         while (!should_stop()) {
  92                 if (sock == -1) {
  93                         int port_num = atoi(port.c_str());
  94                         sock = create_server_socket(port_num, UDP_SOCKET);
  95                         if (sock == -1) {
  96                                 log(WARNING, "[%s] UDP socket creation failed. Waiting 0.2 seconds and trying again...",
  97                                              url.c_str());
  98                                 usleep(200000);
  99                                 continue;
 100                         }
 101                 }
 102
 103                 // Wait for a packet, or a wakeup.
 104                 bool activity = wait_for_activity(sock, POLLIN, NULL);
 105                 if (!activity) {
 106                         // Most likely, should_stop was set.
 107                         continue;
 108                 }
 109
 110                 int ret;
 111                 do {
 112                         ret = recv(sock, packet_buf, sizeof(packet_buf), 0);
 113                 } while (ret == -1 && errno == EINTR);
 114
 115                 if (ret <= 0) {
 116                         log_perror("recv");
 117                         close_socket();
 118                         continue;
 119                 }
 120
 121                 {
 122                         MutexLock lock(&stats_mutex);
 123                         stats.bytes_received += ret;
 124                         stats.data_bytes_received += ret;
 125                 }
 126
 127                 for (size_t i = 0; i < stream_indices.size(); ++i) {
 128                         servers->add_data(stream_indices[i], packet_buf, ret, SUITABLE_FOR_STREAM_START);
 129                 }
 130         }
 131 }
 132
 133 InputStats UDPInput::get_stats() const
 134 {
 135         MutexLock lock(&stats_mutex);
 136         return stats;
 137 }