Catching timeout exception in ExecuteAsync

[vinkaga]

How does one catch the timeout exception? I tried the following 2
patterns and neither one catches the exception.

1. var request = new RestRequest(resource, Method.POST);
client.ExecuteAsync(request, response => {
try {
object result = response.Content;
callback(result);
} catch (Exception e) {
callback(e);
}
});

2. var request = new RestRequest(resource, Method.POST);
try {
client.ExecuteAsync(request, response => {
object result = response.Content;
callback(result);
});
} catch (Exception e) {
callback(e);
}

How can one catch the timeout exception? Thanks in advance.

[Andrew Young]

Timeouts don't throw exceptions. They are reported in the ResponseStatus. Check for the status in your callback.

if(response.ResponseStatus == ResponseStatus.TimedOut)

{

    // request timed out

}

[vinkaga]

Thanks Andrew, I added that check but I still seem to be getting an
exception (MD 2.4.2 with the latest RestSharp code from github).

https://docs.google.com/leaf?id=0B0F93HP6ltLpZTZkMTFmZGQtNDQyNy00NTk4LWEwZGUtYTM3MDYxODc5OGE3&hl=en_US

https://docs.google.com/leaf?id=0B0F93HP6ltLpOGFjYzVjMDItOTI4YS00ZTY1LWExNmItZmJlYjg5MThhN2Zk&hl=en_US

Thanks in advance.

[Andrew Young]

I think you have discovered a bug in RestSharp. 

RequestStreamCallback() is being called as soon as the request is aborted but there's no logic in there to detect if a timeout has occurred, thus a WebException is thrown when RestSharp calls EndGetRequestStream.

I wrote up an issue in github for this. https://github.com/johnsheehan/RestSharp/issues/156

But for now, is the exception being caught in your try/catch?

[vinkaga]

No, the exception is not being caught by try-catch on ExecuteAsync nor
by try-catch on the callback. I guess the exception is being generated
in a background thread before the callback is being called.

[Andrew Young]

If it is not catching the exception, what is your app doing when it times out? If it is crashing your app then it's probably still on the main thread. 

[vinkaga]

I am testing on iPhone simulator and MD stops on the exception. My
test code is running on a non-gui thread like the following but that
still stops MD.

public static void Main(string[] args) {
new Thread(new ThreadStart(ApplicationDelegate.test)).Start();
UIApplication.Main(args, null, "ApplicationDelegate");
}

public static void test() {
ping(result => {ObjectDumper.Write(result);});
}

public void ping(Action<object> callback) {
try {
var request = new RestRequest(URL_PING, Method.POST);
client.ExecuteAsync(request, response => {
try {
if (response.ResponseStatus == ResponseStatus.Completed) {
var result = response.Content;
callback(result);
} else {
callback("Request failed " + response.ResponseStatus);

}
} catch (Exception e) {
callback(e);
}
});

} catch (Exception e) {
callback(e);
}
}