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# frozen_string_literal: true
module HTTP2
# HTTP 2.0 client connection class that implements appropriate header
# compression / decompression algorithms and stream management logic.
#
# Your code is responsible for driving the client object, which in turn
# performs all of the necessary HTTP 2.0 encoding / decoding, state
# management, and the rest. A simple example:
#
# @example
# socket = YourTransport.new
#
# conn = HTTP2::Client.new
# conn.on(:frame) {|bytes| socket << bytes }
#
# while bytes = socket.read
# conn << bytes
# end
#
class Client < Connection
# Initialize new HTTP 2.0 client object.
def initialize(settings = {})
@stream_id = 1
@state = :waiting_connection_preface
@local_role = :client
@remote_role = :server
@h2c_upgrade = nil
super
end
# Send an outgoing frame. Connection and stream flow control is managed
# by Connection class.
#
# @see Connection
# @param frame [Hash]
def send(frame)
send_connection_preface
super
end
def receive(frame)
send_connection_preface
super
end
# sends the preface and initializes the first stream in half-closed state
def upgrade
@h2c_upgrade = :start
raise ProtocolError unless @stream_id == 1
send_connection_preface
stream = new_stream(state: :half_closed_local)
@h2c_upgrade = :finished
stream
end
# Emit the connection preface if not yet
def send_connection_preface
return unless @state == :waiting_connection_preface
@state = :connected
emit(:frame, CONNECTION_PREFACE_MAGIC)
payload = @local_settings.reject { |k, v| v == SPEC_DEFAULT_CONNECTION_SETTINGS[k] }
settings(payload)
end
def self.settings_header(settings)
frame = Framer.new.generate(type: :settings, stream: 0, payload: settings)
Base64.urlsafe_encode64(frame[9..-1])
end
private
def verify_pseudo_headers(frame)
_verify_pseudo_headers(frame, RESPONSE_MANDATORY_HEADERS)
end
end
end
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