`class Client`

Represents an HTTP/2 client connection. Manages client-side protocol semantics including stream ID allocation, connection preface handling, and push promise processing.

Definitions

`def initialize(framer)`

Initialize a new HTTP/2 client connection.

Signature

parameter　framer　Framer: The frame handler for reading/writing HTTP/2 frames.

Implementation

def initialize(framer)
	super(framer, 1)
end

`def local_stream_id?(id)`

Check if the given stream ID represents a locally-initiated stream. Client streams have odd numbered IDs.

Signature

parameter　id　Integer: The stream ID to check.
returns　bool: True if the stream ID is locally-initiated.

Implementation

def local_stream_id?(id)
	id.odd?
end

`def remote_stream_id?(id)`

Check if the given stream ID represents a remotely-initiated stream. Server streams have even numbered IDs.

Signature

parameter　id　Integer: The stream ID to check.
returns　bool: True if the stream ID is remotely-initiated.

Implementation

def remote_stream_id?(id)
	id.even?
end

`def valid_remote_stream_id?(stream_id)`

Check if the given stream ID is valid for remote initiation. Server-initiated streams must have even numbered IDs.

Signature

parameter　stream_id　Integer: The stream ID to validate.
returns　bool: True if the stream ID is valid for remote initiation.

Implementation

def valid_remote_stream_id?(stream_id)
	stream_id.even?
end

`def send_connection_preface(settings = [])`

Send the HTTP/2 connection preface and initial settings. This must be called once when the connection is first established.

Signature

parameter　settings　Array: Optional settings to send with the connection preface.
raises　ProtocolError: If called when not in the new state.

Implementation

def send_connection_preface(settings = [])
	if @state == :new
		@framer.write_connection_preface
		
		send_settings(settings)
		
		yield if block_given?
		
		read_frame do |frame|
			unless frame.is_a? SettingsFrame
				raise ProtocolError, "First frame must be #{SettingsFrame}, but got #{frame.class}"
			end
		end
	else
		raise ProtocolError, "Cannot send connection preface in state #{@state}"
	end
end

`def create_push_promise_stream`

Clients cannot create push promise streams.

Signature

raises　ProtocolError: Always, as clients cannot initiate push promises.

Implementation

def create_push_promise_stream
	raise ProtocolError, "Cannot create push promises from client!"
end

`def receive_push_promise(frame)`

Process a push promise frame received from the server.

Signature

parameter　frame　PushPromiseFrame: The push promise frame to process.
returns　Array(Stream, Hash) | Nil: The promised stream and request headers, or nil if no associated stream.

Implementation

def receive_push_promise(frame)
	if frame.stream_id == 0
		raise ProtocolError, "Cannot receive headers for stream 0!"
	end
	
	if stream = @streams[frame.stream_id]
		# This is almost certainly invalid:
		promised_stream, request_headers = stream.receive_push_promise(frame)
		
		return promised_stream, request_headers
	end
end