private async Task <InterceptedResponse> GetResponseFromLocalTargetAsync(IOnPremiseTargetConnector connector, string url, IOnPremiseTargetRequest onPremiseTargetRequest, string relayedRequestHeader)
{
var request = new InterceptedRequest(onPremiseTargetRequest);
try
{
var requestInterceptor = _onPremiseInterceptorFactory.CreateOnPremiseRequestInterceptor();
requestInterceptor?.HandleRequest(request);
}
catch (Exception ex)
{
_logger?.Error(ex, "Error during intercepting the request. request-id={RequestId}", request.RequestId);
}
var onPremiseTargetResponse = await connector.GetResponseFromLocalTargetAsync(url, request, relayedRequestHeader).ConfigureAwait(false);
var response = new InterceptedResponse(onPremiseTargetResponse);
try
{
var responseInterceptor = _onPremiseInterceptorFactory.CreateOnPremiseResponseInterceptor();
responseInterceptor?.HandleResponse(request, response);
}
catch (Exception ex)
{
_logger?.Error(ex, "Error during intercepting the response. request-id={RequestId}", request.RequestId);
}
return(response);
}
private async Task RequestLocalTargetAsync(RequestContext ctx, string key, IOnPremiseTargetConnector connector, IOnPremiseTargetRequestInternal request, CancellationToken cancellationToken)
{
_logger?.Debug("Relaying request to local target. request-id={RequestId}, request-url={RequestUrl}", request.RequestId, request.Url);
var url = (request.Url.Length > key.Length) ? request.Url.Substring(key.Length + 1) : String.Empty;
if (request.Body != null)
{
if (request.Body.Length == 0)
{
// a length of 0 indicates that there is a larger body available on the server
_logger?.Verbose("Requesting body. request-id={RequestId}", request.RequestId);
// request the body from the RelayServer (because SignalR cannot handle large messages)
var webResponse = await GetToRelay("/request/" + request.RequestId, cancellationToken).ConfigureAwait(false);
request.Stream = await webResponse.Content.ReadAsStreamAsync().ConfigureAwait(false); // this stream should not be disposed (owned by the Framework)
}
else
{
// the body is small enough to be used directly
request.Stream = new MemoryStream(request.Body);
}
}
else
{
// no body available (e.g. GET request)
request.Stream = Stream.Null;
}
using (var response = await connector.GetResponseFromLocalTargetAsync(url, request, RelayedRequestHeader).ConfigureAwait(false))
{
if (response.Stream == null)
{
response.Stream = Stream.Null;
}
_logger?.Debug("Sending response. request-id={RequestId}", request.RequestId);
try
{
// transfer the result to the RelayServer (need POST here, because SignalR does not handle large messages)
await PostResponseAsync(ctx, response, cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
_logger?.Error(ex, "Error during posting local target response to relay. request-id={RequestId}", request.RequestId);
}
}
}