/// <summary>
/// Gets or creates a new stream for the dictionary.
/// </summary>
/// <param name="streamId">The stream id.</param>
/// <returns>The current stream.</returns>
internal ContextStream GetStream(int streamId)
{
ContextStream stream;
if (!_contextStreamDictionary.TryGetValue(streamId, out stream))
{
// Get the max stream concurrent streams
SettingsPair max = _settings[2];
// If more streams can be created.
if (_contextStreamDictionary.Count < max.Value)
{
// Try to create the stream.
stream = new ContextStream(streamId, this);
stream.Opened = true;
// Add the stream to the connection.
_contextStreamDictionary.Add(streamId, stream);
return(stream);
}
else
{
return(null);
}
}
return(stream);
}
/// <summary>
/// Set the settings value internally.
/// </summary>
/// <param name="id">The setting id.</param>
/// <param name="value">The setting value.</param>
internal void SetSettingsPair(SettingsRegistry id, int value)
{
// For each setting.
for (int i = 0; i < _settings.Length; i++)
{
// Get the item.
SettingsPair item = _settings[i];
// If the id has been found.
if (id == item.Id)
{
// Set the new value.
_settings[i].Value = value;
}
}
}
/// <summary>
/// Http server context.
/// </summary>
/// <param name="requestInput">The request input stream containing the raw data.</param>
/// <param name="responseOutput">The response output stream containing the raw data.</param>
public HttpContext(System.IO.Stream requestInput, System.IO.Stream responseOutput)
{
// Create the initial settings.
_settings = new SettingsPair[6];
_settings[0] = new SettingsPair(SettingsRegistry.Header_Table_Size, 4096);
_settings[1] = new SettingsPair(SettingsRegistry.Enable_Push, 1);
_settings[2] = new SettingsPair(SettingsRegistry.Max_Concurrent_Streams, Constants.DefaultMaxConcurrentStreams);
_settings[3] = new SettingsPair(SettingsRegistry.Initial_Window_Size, Constants.InitialFlowControlWindowSize);
_settings[4] = new SettingsPair(SettingsRegistry.Max_Frame_Size, Constants.MaxFramePayloadSize);
_settings[5] = new SettingsPair(SettingsRegistry.Max_Header_List_Size, Int32.MaxValue);
// Create the stream collections.
_contextStreamDictionary = new Collections.CustomDictionary <int, ContextStream>();
_promisedResources = new Dictionary <int, string>();
// Set the request and response streams.
Input = requestInput;
Output = responseOutput;
}
/// <summary>
/// Process a setting frame request.
/// </summary>
/// <param name="httpContext">The current http context.</param>
/// <param name="settingFrame">The setting frame.</param>
private static void ProcessSettingFrameRequest(Nequeo.Net.Http2.HttpContext httpContext, SettingsFrame settingFrame)
{
bool isAck = false;
/* If an endpoint receives a SETTINGS frame whose stream identifier
* field is other than 0x0, the endpoint MUST respond with a connection
* error of type PROTOCOL_ERROR. */
if (settingFrame.StreamId != 0)
{
throw new ProtocolError(ErrorCodeRegistry.Protocol_Error, "Settings frame stream id is not equal to 0.");
}
/* Receipt of a SETTINGS frame with the ACK flag set and a length
* field value other than 0 MUST be treated as a connection error
* of type FRAME_SIZE_ERROR. */
if (settingFrame.IsAck)
{
if (settingFrame.PayloadLength != 0)
{
throw new ProtocolError(ErrorCodeRegistry.Frame_Size_Error,
"Settings frame with ACK flag set and non-zero payload.");
}
isAck = true;
}
// If is not acknowledged.
if (!isAck)
{
// For the settings data received.
for (int i = 0; i < settingFrame.EntryCount; i++)
{
SettingsPair setting = settingFrame[i];
switch (setting.Id)
{
case SettingsRegistry.Enable_Push:
httpContext.SetSettingsPair(SettingsRegistry.Enable_Push, setting.Value);
break;
case SettingsRegistry.Header_Table_Size:
httpContext.SetSettingsPair(SettingsRegistry.Header_Table_Size, setting.Value);
break;
case SettingsRegistry.Initial_Window_Size:
httpContext.SetSettingsPair(SettingsRegistry.Initial_Window_Size, setting.Value);
break;
case SettingsRegistry.Max_Concurrent_Streams:
httpContext.SetSettingsPair(SettingsRegistry.Max_Concurrent_Streams, setting.Value);
break;
case SettingsRegistry.Max_Frame_Size:
httpContext.SetSettingsPair(SettingsRegistry.Max_Frame_Size, setting.Value);
break;
case SettingsRegistry.Max_Header_List_Size:
httpContext.SetSettingsPair(SettingsRegistry.Max_Header_List_Size, setting.Value);
break;
default:
/* An endpoint that receives a SETTINGS frame with any other identifier
* MUST treat this as a connection error of type PROTOCOL_ERROR. */
throw new ProtocolError(ErrorCodeRegistry.Protocol_Error, "Unknown setting identifier.");
}
}
}
// If is not acknowledged.
if (!settingFrame.IsAck)
{
// Sending ACK settings
SettingsFrame frame = new SettingsFrame(new List <SettingsPair>(new SettingsPair[0]), true);
// Write the frame.
httpContext.ResponseWrite(frame.Buffer);
}
}
