static void NextResponse(HttpStageProcessingAsyncResult self)
{
var state = self.state;
HttpStage previous = null;
while (state.states.Count != 0)
{
var current = (HttpStage)state.stages[state.states.Count - 1];
try
{
if (state.Cancelled)
{
Trace(state, "response cancel current", current);
Trace(state, "response cancel previous", previous);
self.Complete(previous, new OperationCanceledException());
return;
}
var stageState = state.states.Pop();
var async = current as HttpAsyncStage;
if (async != null && state.AllowAsync)
{
Trace(state, "response async", current);
var r = async.BeginProcessResponse(state.Response, stageState, FinishResponseCallback, self);
if (r.CompletedSynchronously)
{
Trace(state, "response async", current, "completed sync");
async.EndProcessResponse(r);
}
else
{
return;
}
}
else
{
Trace(state, "response sync", current);
current.ProcessResponse(state.Response, stageState);
}
}
catch (Exception e)
{
if (IsFatal(e))
{
throw;
}
Trace(state, "NextResponse", current, "exception in processing: " + e.GetType() + " " + e.Message);
self.Complete(current, e);
return;
}
previous = current;
}
self.Complete();
}
void Complete(HttpStage stage, Exception e)
{
Debug.WriteLine("Exception: " + e.GetType() + ": " + e.Message);
Debug.WriteLine("Thrown at: " + Environment.StackTrace.Trim());
if (state.Cancelled && !(e is OperationCanceledException))
{
e = new OperationCanceledException("cancel with exception", e);
}
var ex = e as HttpProcessingException;
if (ex == null)
{
ex = new HttpStageProcessingException(e.Message, e, stage, state.request, state.GetResponseOrNull());
}
state.SetException(ex);
if (state.StayedSynchronous && state.ForceSynchronous)
{
throw ex;
}
this.Complete(state.StayedSynchronous, ex);
}
public HttpStageProcessingException(string message, Exception inner, HttpStage stage, HttpRequestMessage request, HttpResponseMessage response) :
base(message, inner, request, response)
{
this.Stage = stage;
}
static void NextRequest(HttpStageProcessingAsyncResult self)
{
var state = self.state;
HttpStage previous = null;
HttpResponseMessage response = null;
while (state.states.Count < state.stages.Count)
{
var current = state.stages[state.states.Count];
try
{
var async = current as HttpAsyncStage;
object stageState;
if (state.Cancelled)
{
response = null;
Trace(state, "request cancel previous: ", previous);
Trace(state, "request cancel current: ", current);
self.Complete(previous, new OperationCanceledException());
return;
}
if (async != null && state.AllowAsync)
{
Trace(state, "request async", current);
var r = async.BeginProcessRequestAndTryGetResponse(state.request, FinishRequestCallback, self);
if (r.CompletedSynchronously)
{
Trace(state, "request async", current, "completed sync");
async.EndProcessRequestAndTryGetResponse(r, out response, out stageState);
}
else
{
Trace(state, "request async", current, " is running");
return;
}
}
else
{
Trace(state, "request sync", current);
current.ProcessRequestAndTryGetResponse(state.request, out response, out stageState);
}
state.states.Push(stageState);
if (response != null)
{
state.SetResponse(response);
break;
}
}
catch (Exception e)
{
if (IsFatal(e))
{
throw;
}
Trace(state, "NextRequest", current, "exception in processing: " + e.GetType() + " " + e.Message);
self.Complete(current, e);
return;
}
previous = current;
}
if (response != null)
{
NextResponse(self);
}
else
{
self.Complete(null, new InvalidOperationException("HttpResponseMessage not available"));
}
}
public static void Trace(HttpStageProcessingAsyncState state, string location, HttpStage current, string detail)
{
#if DEBUG && TRACE
var t = DateTime.UtcNow - state.started;
var s = string.Format("{0,-20} {1} {2} {3}", t, location, current, detail);
Debug.WriteLine(s);
#endif
}
public static void Trace(HttpStageProcessingAsyncState state, string location, HttpStage current)
{
Trace(state, location, current, null);
}
public HttpStageProcessingException(string message, Exception inner, HttpStage stage, HttpRequestMessage request, HttpResponseMessage response) :
base(message, inner, request, response)
{
this.Stage = stage;
}