/* Keeping a user logged in indefinitely solves one issue.
* How do we handle host accessibility issues?
* Ping Fishbowl server periodically so that we can
* automatically reconnect when it's back online.
* TODO: Verify that this works.
*/
public static void WatchDog()
{
Console.WriteLine("WatchDog() started");
// Grab Fishbowl host address
string FishbowlServer = ConfigurationManager.AppSettings.Get("FishbowlServer");
Ping pingSender = new Ping();
PingOptions options = new PingOptions();
// Use the default TTL value which is 128,
// but change the fragmentation behavior.
options.DontFragment = true;
// Create a buffer of 32 bytes of data to be transmitted.
string data = "****RESTfulFish Gateway Ping****";
byte[] buffer = Encoding.ASCII.GetBytes(data);
int timeout = 120;
while (true)
{
try
{
PingReply reply = pingSender.Send(FishbowlServer, timeout, buffer, options);
if (reply.Status == IPStatus.DestinationHostUnreachable)
{
// Tell KeepAlive() and everyone else to stop sending data to Fishbowl since it's down.
FishbowlServerDown = true;
Console.WriteLine("Fishbowl server is down!");
Console.WriteLine("Checking if Fishbowl server is up in 5 seconds.");
Thread.Sleep(5000);
// TODO: Verify that pinging a specific port signifies that an
// application (Fishbowl) is listening on it and not just the OS responding.
while (!ConnectionObject.IsFishbowlPortOpen())
{
Console.WriteLine("Fishbowl server is still down, chaecking again in 5 seconds.");
// Wait five seconds before checking again
Thread.Sleep(5000);
}
// TODO: Determine best option. Restart app or recall methods/functions?
// Restart app
System.Diagnostics.Process.Start(Assembly.GetExecutingAssembly().Location);
Environment.Exit(0);
}
// Ping every 2 seconds
Thread.Sleep(2000);
}
catch (Exception e)
{
Misc.ExceptionMessage("WatchDog", e, null, false);
}
}
// Reconnect
}
