git.sesse.net Git - cubemap/blob - input_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 <math.h>
   9 #include <vector>
  10
  11 #include "input.h"
  12 #include "input_stats.h"
  13 #include "log.h"
  14 #include "util.h"
  15
  16 using namespace std;
  17
  18 InputStatsThread::InputStatsThread(const string &stats_file, int stats_interval, const vector<Input*> &inputs)
  19         : stats_file(stats_file),
  20           stats_interval(stats_interval),
  21           inputs(inputs)
  22 {
  23 }
  24
  25 void InputStatsThread::do_work()
  26 {
  27         while (!should_stop()) {
  28                 int fd;
  29                 FILE *fp;
  30                 time_t now;
  31
  32                 // Open a new, temporary file.
  33                 char *filename = strdup((stats_file + ".new.XXXXXX").c_str());
  34                 fd = mkostemp(filename, O_WRONLY);
  35                 if (fd == -1) {
  36                         log_perror(filename);
  37                         free(filename);
  38                         goto sleep;
  39                 }
  40
  41                 fp = fdopen(fd, "w");
  42                 if (fp == nullptr) {
  43                         log_perror("fdopen");
  44                         safe_close(fd);
  45                         if (unlink(filename) == -1) {
  46                                 log_perror(filename);
  47                         }
  48                         free(filename);
  49                         goto sleep;
  50                 }
  51
  52                 now = time(nullptr);
  53                 for (size_t i = 0; i < inputs.size(); ++i) {
  54                         InputStats stats = inputs[i]->get_stats();
  55                         fprintf(fp, "%s %llu %llu", stats.url.c_str(),
  56                                 (long long unsigned)(stats.bytes_received),
  57                                 (long long unsigned)(stats.data_bytes_received));
  58                         if (stats.connect_time == -1) {
  59                                 fprintf(fp, " -");
  60                         } else {
  61                                 fprintf(fp, " %d", int(now - stats.connect_time));
  62                         }
  63                         fprintf(fp, " %llu", (long long unsigned)(stats.metadata_bytes_received));
  64                         if (!isfinite(stats.latency_sec)) {
  65                                 fprintf(fp, " -");
  66                         } else {
  67                                 fprintf(fp, " %.6f", stats.latency_sec);
  68                         }
  69                         fprintf(fp, "\n");
  70                 }
  71                 if (fclose(fp) == EOF) {
  72                         log_perror("fclose");
  73                         if (unlink(filename) == -1) {
  74                                 log_perror(filename);
  75                         }
  76                         free(filename);
  77                         goto sleep;
  78                 }
  79
  80                 if (rename(filename, stats_file.c_str()) == -1) {
  81                         log_perror("rename");
  82                         if (unlink(filename) == -1) {
  83                                 log_perror(filename);
  84                         }
  85                 }
  86                 free(filename);
  87
  88 sleep:
  89                 // Wait until we are asked to quit, stats_interval timeout,
  90                 // or a spurious signal. (The latter will cause us to write stats
  91                 // too often, but that's okay.)
  92                 timespec timeout_ts;
  93                 timeout_ts.tv_sec = stats_interval;
  94                 timeout_ts.tv_nsec = 0;
  95                 wait_for_wakeup(&timeout_ts);
  96         }
  97 }