static void SaveSnapshot(net_state snapshot)
{
String raw_json = JsonConvert.SerializeObject(snapshot, Formatting.Indented);
String snapshot_path = Path.Combine(Environment.CurrentDirectory, "snapshots", $"net{snapshot.measure_id}.json");
File.WriteAllText(snapshot_path, raw_json);
if (WRITE_CSV)
{
//Generate RTT string
String rtts = "";
int avg_rtt = 0;
foreach (var ci in PING_HOSTS)
{
rtts += $"{snapshot.avg_rtts[ci]};";
avg_rtt += snapshot.avg_rtts[ci];
}
avg_rtt = avg_rtt / PING_HOSTS.Count;
File.AppendAllText(OUT_CSV_FILE, CSV_PATTERN
.Replace("FTIME", snapshot.measure_time.ToShortDateString() + " " + snapshot.measure_time.ToShortTimeString())
.Replace("IUP", snapshot.inet_ok.ToString())
.Replace("AVGRTT", avg_rtt.ToString())
.Replace("ROUTERRTT", snapshot.router_rtt.ToString())
.Replace("LOSS", snapshot.packet_loss.ToString())
.Replace("HTTP", snapshot.http_ok.ToString())
.Replace("MID", snapshot.measure_id.ToString())
.Replace("STIME", snapshot.measure_time.ToShortTimeString())
.Replace("SEQ", seq_id++.ToString())
.Replace("RN", $"{rtts};;\r\n"));
}
}
private static void DoMeasures()
{
System.Timers.Timer _timer = new System.Timers.Timer();
_timer.AutoReset = true;
_timer.Interval = MEASURE_DELAY;
_timer.Elapsed += delegate
{
net_state snapshot = new net_state();
snapshot.inet_ok = true;
snapshot.measure_id = start_measure_id++;
snapshot.measure_time = DateTime.Now;
Ping ping = new Ping();
//First, check if router is available
var prr = ping.Send(ROUTER_IP, PING_TIMEOUT);
snapshot.router_rtt = prr.Status == IPStatus.Success ? (int)prr.RoundtripTime : PING_TIMEOUT;
if (prr.Status != IPStatus.Success)
{
//Router is unreachable. Don't waste resources
snapshot.avg_rtts = new Dictionary <string, int>();
snapshot.http_ok = false;
snapshot.inet_ok = false;
snapshot.packet_loss = 1;
foreach (var ci in PING_HOSTS)
{
snapshot.avg_rtts.Add(ci, PING_TIMEOUT);
}
WriteLog("Router was unreachable.");
SaveSnapshot(snapshot);
if (prev_inet_ok)
{
//Internet was fine but failed now
prev_inet_ok = false;
first_fail_time = DateTime.Now;
}
return;
}
//Still alive so router is up
try
{
snapshot.http_ok = true;
TcpClient tc = new TcpClient();
tc.BeginConnect(HTTP_TEST_HOST, HTTP_TEST_PORT, null, null);
Thread.Sleep(HTTP_TIMEOUT);
if (!tc.Connected)
{
snapshot.http_ok = false;
}
tc.Dispose();
}
catch { snapshot.http_ok = false; snapshot.inet_ok = false; }
//Now do ping test
exited_threads = 0;
pkt_sent = 0;
success_pkts = 0;
total_time = 0;
measure_results = new Dictionary <string, int>();
foreach (var ci in PING_HOSTS)
{
Thread thread = new Thread(new ParameterizedThreadStart(PerformPingTest));
thread.Start(ci);
}
while (exited_threads < PING_HOSTS.Count)
{
continue;
}
//Analyze results
snapshot.avg_rtts = measure_results;
snapshot.packet_loss = (double)(pkt_sent - success_pkts) / pkt_sent;
snapshot.inet_ok = !(
snapshot.http_ok == false ||
((double)total_time / success_pkts >= 0.75 * PING_TIMEOUT) ||
snapshot.packet_loss >= MAX_PKT_LOSS ||
snapshot.router_rtt == PING_TIMEOUT);
SaveSnapshot(snapshot);
if (prev_inet_ok && !snapshot.inet_ok)
{
//Internet was fine but failed now
prev_inet_ok = false;
first_fail_time = DateTime.Now;
}
else if (!prev_inet_ok && snapshot.inet_ok)
{
String t_s = new TimeSpan(DateTime.Now.Ticks - first_fail_time.Ticks).ToString(@"hh\:mm\:ss");
TgNotify($"Internet was down from {first_fail_time.ToShortTimeString()} to {DateTime.Now.ToShortTimeString()} (downtime {t_s})\r\n\r\n" +
$"Current average ping: {snapshot.avg_rtts.Values.Average()} ms\r\n" +
$"HTTP test: " + (snapshot.http_ok? "PASSED" : "FAILED") + "\r\n" +
$"Packet loss: " + (snapshot.packet_loss * 100).ToString("N2"), true);
prev_inet_ok = true;
}
};
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
httpc = new HttpClient();
_timer.Start();
TgNotify("nmon is now running", true);
while (true)
{
Thread.Sleep(1000000);
}
}
