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

   1 #include <fcntl.h>
   2 #include <stddef.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <time.h>
   7 #include <unistd.h>
   8 #include <sys/poll.h>
   9 #include <errno.h>
  10 #include <vector>
  11
  12 #include "client.h"
  13 #include "log.h"
  14 #include "serverpool.h"
  15 #include "stats.h"
  16
  17 using namespace std;
  18
  19 extern ServerPool *servers;
  20
  21 StatsThread::StatsThread(const std::string &stats_file, int stats_interval)
  22         : stats_file(stats_file),
  23           stats_interval(stats_interval)
  24 {
  25 }
  26
  27 void StatsThread::do_work()
  28 {
  29         while (!should_stop) {
  30                 int fd;
  31                 FILE *fp;
  32                 time_t now;
  33                 vector<ClientStats> client_stats;
  34
  35                 // Open a new, temporary file.
  36                 char *filename = strdup((stats_file + ".new.XXXXXX").c_str());
  37                 fd = mkostemp(filename, O_WRONLY);
  38                 if (fd == -1) {
  39                         log_perror(filename);
  40                         free(filename);
  41                         goto sleep;
  42                 }
  43
  44                 fp = fdopen(fd, "w");
  45                 if (fp == NULL) {
  46                         log_perror("fdopen");
  47                         close(fd);
  48                         unlink(filename);
  49                         free(filename);
  50                         goto sleep;
  51                 }
  52
  53                 now = time(NULL);
  54                 client_stats = servers->get_client_stats();
  55                 for (size_t i = 0; i < client_stats.size(); ++i) {
  56                         fprintf(fp, "%s %d %d %s %d %llu %llu %llu\n",
  57                                 client_stats[i].remote_addr.c_str(),
  58                                 client_stats[i].sock,
  59                                 client_stats[i].fwmark,
  60                                 client_stats[i].stream_id.c_str(),
  61                                 int(now - client_stats[i].connect_time),
  62                                 (long long unsigned)(client_stats[i].bytes_sent),
  63                                 (long long unsigned)(client_stats[i].bytes_lost),
  64                                 (long long unsigned)(client_stats[i].num_loss_events));
  65                 }
  66                 if (fclose(fp) == EOF) {
  67                         log_perror("fclose");
  68                         unlink(filename);
  69                         free(filename);
  70                         goto sleep;
  71                 }
  72
  73                 if (rename(filename, stats_file.c_str()) == -1) {
  74                         log_perror("rename");
  75                         unlink(filename);
  76                 }
  77                 free(filename);
  78
  79 sleep:
  80                 // Wait until the stop_fd pipe is closed, stats_interval timeout,
  81                 // or a spurious signal. (The latter will cause us to write stats
  82                 // too often, but that's okay.)
  83                 pollfd pfd;
  84                 pfd.fd = stop_fd_read;
  85                 pfd.events = POLLIN | POLLRDHUP;
  86
  87                 int nfds = poll(&pfd, 1, stats_interval * 1000);
  88                 if (nfds == 0 || (nfds == -1 && errno == EINTR)) {
  89                         continue;
  90                 }
  91                 if (nfds == 1) {
  92                         // Should stop.
  93                         break;
  94                 }
  95                 if (nfds == -1) {
  96                         log_perror("poll");
  97                         usleep(100000);
  98                         continue;
  99                 }
 100         }
 101 }