module Protocol::HTTP2::FlowControlled
Public Instance Methods
available_frame_size(maximum_frame_size = self.maximum_frame_size)
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This could be negative if the window has been overused due to a change in initial window size.
# File lib/protocol/http2/flow_controlled.rb, line 31 def available_frame_size(maximum_frame_size = self.maximum_frame_size) available_size = self.available_size # puts "available_size=#{available_size} maximum_frame_size=#{maximum_frame_size}" if available_size < maximum_frame_size return available_size else return maximum_frame_size end end
available_size()
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# File lib/protocol/http2/flow_controlled.rb, line 26 def available_size @remote_window.available end
consume_local_window(frame)
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# File lib/protocol/http2/flow_controlled.rb, line 62 def consume_local_window(frame) # For flow-control calculations, the 9-octet frame header is not counted. amount = frame.length @local_window.consume(amount) end
consume_remote_window(frame)
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Keep track of the amount of data sent, and fail if is too much.
# File lib/protocol/http2/flow_controlled.rb, line 44 def consume_remote_window(frame) amount = frame.length # Frames with zero length with the END_STREAM flag set (that is, an empty DATA frame) MAY be sent if there is no available space in either flow-control window. if amount.zero? and frame.end_stream? # It's okay, we can send. No need to consume, it's empty anyway. elsif amount >= 0 and amount <= @remote_window.available @remote_window.consume(amount) else raise FlowControlError, "Trying to send #{frame.length} bytes, exceeded window size: #{@remote_window.available} (#{@remote_window})" end end
receive_window_update(frame)
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# File lib/protocol/http2/flow_controlled.rb, line 84 def receive_window_update(frame) amount = frame.unpack # Async.logger.info(self) {"expanding remote_window=#{@remote_window} by #{amount}"} if amount != 0 @remote_window.expand(amount) else raise ProtocolError, "Invalid window size increment: #{amount}!" end # puts "expanded remote_window=#{@remote_window} by #{amount}" end
request_window_update()
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# File lib/protocol/http2/flow_controlled.rb, line 68 def request_window_update if @local_window.limited? self.send_window_update(@local_window.wanted) end end
send_window_update(window_increment)
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Notify the remote end that we are prepared to receive more data:
# File lib/protocol/http2/flow_controlled.rb, line 75 def send_window_update(window_increment) frame = WindowUpdateFrame.new(self.id) frame.pack window_increment write_frame(frame) @local_window.expand(window_increment) end
update_local_window(frame)
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# File lib/protocol/http2/flow_controlled.rb, line 57 def update_local_window(frame) consume_local_window(frame) request_window_update end
window_updated(size)
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The window has been expanded by the given amount. @param size [Integer] the maximum amount of data to send. @return [Boolean] whether the window update was used or not.
# File lib/protocol/http2/flow_controlled.rb, line 101 def window_updated(size) return false end