From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Wed, 10 Apr 2013 21:11:00 +0000 (+0200)
Subject: Factor statistics writing into its own class and file.
X-Git-Tag: 1.0.0~160
X-Git-Url: https://git.sesse.net/?p=cubemap;a=commitdiff_plain;h=e8eff7cedea352b618b114a4d88bb8110d787e4c

Factor statistics writing into its own class and file.
---

diff --git a/stats.cpp b/stats.cpp
new file mode 100644
index 0000000..445bae7
--- /dev/null
+++ b/stats.cpp
@@ -0,0 +1,97 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <pthread.h>
+
+#include "serverpool.h"
+#include "stats.h"
+
+using namespace std;
+
+extern ServerPool *servers;
+
+StatsThread::StatsThread(const std::string &stats_file, int stats_interval)
+	: stats_file(stats_file),
+	  stats_interval(stats_interval)
+{
+}
+
+void StatsThread::run()
+{
+	should_stop = false;
+	pthread_create(&worker_thread, NULL, do_work_thunk, this);
+}
+
+void StatsThread::stop()
+{
+	should_stop = true;
+	pthread_kill(worker_thread, SIGHUP);
+	if (pthread_join(worker_thread, NULL) == -1) {
+		perror("pthread_join");
+		exit(1);
+	}
+}
+	
+void *StatsThread::do_work_thunk(void *arg)
+{
+	StatsThread *stats_thread = reinterpret_cast<StatsThread *>(arg);
+	stats_thread->do_work();
+	return NULL;
+}
+
+void StatsThread::do_work()
+{
+	while (!should_stop) {
+		int fd;
+		FILE *fp;
+		time_t now;
+		vector<ClientStats> client_stats;
+
+		// Open a new, temporary file.
+		char *filename = strdup((stats_file + ".new.XXXXXX").c_str());
+		fd = mkostemp(filename, O_WRONLY);
+		if (fd == -1) {
+			perror(filename);
+			free(filename);
+			goto sleep;
+		}
+
+		fp = fdopen(fd, "w");
+		if (fp == NULL) {
+			perror("fdopen");
+			close(fd);
+			unlink(filename);
+			free(filename);
+			goto sleep;
+		}
+
+		now = time(NULL);
+		client_stats = servers->get_client_stats();
+		for (size_t i = 0; i < client_stats.size(); ++i) {
+			fprintf(fp, "%s %s %d %llu\n",
+			        client_stats[i].remote_addr.c_str(),
+				client_stats[i].stream_id.c_str(),
+				int(now - client_stats[i].connect_time),
+				(long long unsigned)(client_stats[i].bytes_sent));
+		}
+		if (fclose(fp) == EOF) {
+			perror("fclose");
+			unlink(filename);
+			free(filename);
+			goto sleep;
+		}
+		
+		if (rename(filename, stats_file.c_str()) == -1) {
+			perror("rename");
+			unlink(filename);
+		}
+
+sleep:
+		int left_to_sleep = stats_interval;
+		do {
+			left_to_sleep = sleep(left_to_sleep);
+		} while (left_to_sleep > 0 && !should_stop);
+	}
+}
diff --git a/stats.h b/stats.h
new file mode 100644
index 0000000..c4fb17a
--- /dev/null
+++ b/stats.h
@@ -0,0 +1,29 @@
+#ifndef _STATS_H
+#define _STATS_H 1
+
+#include <pthread.h>
+#include <string>
+
+// A thread that regularly writes out statistics, ie. a list of all connected clients
+// with some information about each.
+
+class StatsThread {
+public:
+	StatsThread(const std::string &stats_file, int stats_interval);
+	void run();
+	void stop();
+
+private:
+	// Recover the this pointer, and call do_work().
+	static void *do_work_thunk(void *arg);
+
+	void do_work();
+
+	std::string stats_file;
+	int stats_interval;
+
+	pthread_t worker_thread;
+	volatile bool should_stop;
+};
+	
+#endif  // !defined(_STATS_H)