internal CacheExecutionResult ExecuteIfCached(Type channel, MethodInfo method, HttpListenerRequest request, HttpListenerResponse response, IChannelHeuristicContext heurContext)
{
CacheExecutionResult result = new CacheExecutionResult();
result.Executed = false;
bool isCacheEnabled = false;
try
{
isCacheEnabled = IsCached(method);
}
catch (InvalidChannelMethodTargetException ex)
{
StreamWriter writer = new StreamWriter(response.OutputStream);
_msgService.ExceptionHandler(writer, ex, response);
writer.Close();
result.Executed = true;
}
if (isCacheEnabled)
{
HeuristicsInfo hInfo = new HeuristicsInfo();
bool isCached = _heuristics.IsMethodCached(channel, method, out hInfo);
if (isCached)
{
ChannelMethodHeuristicOptions hOptions = new ChannelMethodHeuristicOptions
{
Channel = channel,
ChannelMethod = method,
Request = request,
Response = response
};
return(_heuristics.Execute(hOptions, hInfo));
}
else
{
heurContext.ExpectsAdding = true;
heurContext.Channel = channel;
heurContext.MethodInfo = method;
result.Executed = false;
result.DataProcessed = false;
}
}
return(result);
}
internal bool TryInvokeGetRequest(Type channel,
MethodInfo method,
HttpListenerRequest request,
HttpListenerResponse response,
ChannelMethodInfo methodDescription,
ChannelConfigurationInfo channelConfig,
List <object> channelRequestBody,
bool authenticated,
CacheExecutionResult cacheExecutionResult)
{
try
{
if (request.QueryString.AllKeys.Length > 0)
{
SetupAndInvokeGetRequest(channel, method, request, response, methodDescription, channelConfig, channelRequestBody, authenticated, true, cacheExecutionResult);
}
else if (request.QueryString.AllKeys.Length == 0)
{
if (methodDescription.Parameters.Count > 0)
{
StreamWriter writer = new StreamWriter(response.OutputStream);
_msgService.ExceptionHandler(writer, new TargetParameterCountException(), response);
writer.Close();
return(false);
}
SetupAndInvokeGetRequest(channel, method, request, response, methodDescription, channelConfig, channelRequestBody, authenticated, false, cacheExecutionResult);
}
return(true);
}
catch (Exception ex)
{
using (StreamWriter writer = new StreamWriter(response.OutputStream))
{
_msgService.ExceptionHandler(writer, ex, response);
LogChannel.Write(LogSeverity.Fatal, ex.Message);
}
return(true);
}
}
internal void SetupAndInvokeGetRequest(Type channel,
MethodInfo method,
HttpListenerRequest request,
HttpListenerResponse response,
ChannelMethodInfo methodDescription,
ChannelConfigurationInfo channelConfig,
List <object> channelRequestBody,
bool authenticated,
bool hasParams,
CacheExecutionResult cacheExecutionResult)
{
//Context should be initialized before invoking the method because ChannelBase relies on Context
InitChannelMethodContext(channelConfig.Endpoint, request, response, authenticated, channelConfig.HttpMethod, channelRequestBody);
if (hasParams)
{
//Since request body will be processed in Heuristics if cache is enabled
//Data is already stored in Data.Parameters property of CacheExecutionResult
if (!cacheExecutionResult.DataProcessed)
{
_dsrFactory = new ChannelMethodDeserializerFactory(request.QueryString);
channelRequestBody = _dsrFactory.DeserializeFromQueryParameters(methodDescription);
}
else
{
channelRequestBody = cacheExecutionResult.Data.Parameters;
}
_requestActivator.GetActivateWithParameters(channel, method, channelRequestBody, response);
}
else
{
_requestActivator.GetActivateWithoutParameters(channel, method, response);
}
_contextProvider.DestroyChannelMethodContext(channelConfig.Endpoint);
}
internal void TryInvokePostRequest(Type channel,
MethodInfo method,
HttpListenerRequest request,
HttpListenerResponse response,
List <object> channelRequestBody,
ChannelMethodInfo methodDescription,
ChannelConfigurationInfo channelConfig,
bool authenticated,
CacheExecutionResult cacheExecutionResult)
{
StreamWriter writer = new StreamWriter(response.OutputStream);
try
{
//Since request body will be processed in Heuristics if cache is enabled
//InputStream is flushed and data is already stored in Data.Parameters
//property of CacheExecutionResult
if (!cacheExecutionResult.DataProcessed)
{
_dsrFactory = new ChannelMethodDeserializerFactory(request.InputStream);
channelRequestBody = _dsrFactory.DeserializeFromBody(methodDescription, request.ContentType);
}
else
{
channelRequestBody = cacheExecutionResult.Data.Parameters;
}
InitChannelMethodContext(channelConfig.Endpoint, request, response, authenticated, channelConfig.HttpMethod, channelRequestBody);
_requestActivator.PostActivate(channel, method, channelRequestBody, response);
}
catch (ChannelMethodContentTypeException cEx)
{
response.StatusCode = 400;
_msgService.ExceptionHandler(writer, cEx, response);
LogChannel.Write(LogSeverity.Error, cEx.Message);
}
catch (ChannelMethodParameterException pEx)
{
response.StatusCode = 400;
_msgService.ExceptionHandler(writer, pEx, response);
LogChannel.Write(LogSeverity.Error, pEx.Message);
}
catch (TargetParameterCountException tEx)
{
response.StatusCode = 400;
_msgService.ExceptionHandler(writer, tEx, response);
LogChannel.Write(LogSeverity.Error, tEx.Message);
}
catch (Exception ex)
{
response.StatusCode = 500;
_msgService.ExceptionHandler(writer, ex, response);
LogChannel.Write(LogSeverity.Fatal, ex.Message);
}
finally
{
_contextProvider.DestroyChannelMethodContext(channelConfig.Endpoint);
writer.Flush();
writer.Close();
}
}
public void Start()
{
State = EntityState.Starting;
StateName = Enum.GetName(typeof(EntityState), EntityState.Starting);
_httpListener = new HttpListener();
ChannelConfigurationInfo channelConfig = _configuration.Configure(_httpListener, _channel, _method, _baseURL);
Url = channelConfig.MethodUrl;
//Keep the ChannelMethod open for new requests
while (true)
{
try
{
_httpListener.Start();
State = EntityState.Running;
StateName = Enum.GetName(typeof(EntityState), EntityState.Running);
}
catch (HttpListenerException hle)
{
Console.WriteLine($"System.Net.HttpListenerException encountered on {channelConfig.MethodUrl} with reason :{hle.Message}");
return;
}
if (!_isManaged)
{
Console.WriteLine($"Listening on {Url}");
}
HttpListenerContext context = _httpListener.GetContext();
HttpListenerRequest request = context.Request;
HttpListenerResponse response = context.Response;
IChannelHeuristicContext heuristicsCtx = _services.Get <IChannelHeuristicContext>();
LogChannel.Write(LogSeverity.Info, $"Request coming to {channelConfig.Endpoint.Name}");
LogChannel.Write(LogSeverity.Info, $"HttpMethod:{request.HttpMethod}");
ChannelAuthenticationInspector authInspector = new ChannelAuthenticationInspector(_authenticationService, _msgService, _settings, _session, _basicAuthenticationMethod, _tokenAuthenticationMethod);
//Even if method is cached check authenticaion first
bool authFailed = authInspector.AuthenticationFailedIfRequired(context, request, response, channelConfig, out bool authenticated);
if (authFailed)
{
goto EndRequest;
}
List <object> channelRequestBody = null;
ChannelMethodCacheInspector cacheInspector = new ChannelMethodCacheInspector(_msgService, _heuristics);
CacheExecutionResult cacheExecutionResult = cacheInspector.ExecuteIfCached(_channel, _method, request, response, heuristicsCtx);
if (cacheExecutionResult.Executed)
{
heuristicsCtx.Clear();
goto EndRequest;
}
if (channelConfig.HttpMethod.ToString() != request.HttpMethod && channelConfig.HttpMethod != ChannelHttpMethod.Unknown)
{
_msgService.WrongHttpMethod(response, channelConfig.HttpMethod);
LogChannel.Write(LogSeverity.Error, "Wrong HttpMethod... Closing request");
goto EndRequest;
}
ChannelMethodInfo methodDescription = _channelMethodDescriptor.GetMethodDescription(_method);
ChannelMethodCaller channelMethodCaller = new ChannelMethodCaller(_msgService, _contextProvider, _requestActivator);
if (request.HttpMethod == "GET")
{
channelMethodCaller.TryInvokeGetRequest(_channel, _method, request, response, methodDescription, channelConfig, channelRequestBody, authenticated, cacheExecutionResult);
goto EndRequest;
}
//Enter only if Request Body is supplied with POST Method
if (request.HasEntityBody == true && request.HttpMethod == "POST")
{
channelMethodCaller.TryInvokePostRequest(_channel, _method, request, response, channelRequestBody, methodDescription, channelConfig, authenticated, cacheExecutionResult);
}
EndRequest:
LogChannel.Write(LogSeverity.Debug, "Request finished...");
LogChannel.Write(LogSeverity.Debug, "Closing the response");
response.Close();
}
}
