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|
# frozen_string_literal: true
# :markup: markdown
require "websocket/driver"
module ActionCable
module Connection
#--
# This class is heavily based on faye-websocket-ruby
#
# Copyright (c) 2010-2015 James Coglan
class ClientSocket # :nodoc:
def self.determine_url(env)
scheme = secure_request?(env) ? "wss:" : "ws:"
"#{ scheme }//#{ env['HTTP_HOST'] }#{ env['REQUEST_URI'] }"
end
def self.secure_request?(env)
return true if env["HTTPS"] == "on"
return true if env["HTTP_X_FORWARDED_SSL"] == "on"
return true if env["HTTP_X_FORWARDED_SCHEME"] == "https"
return true if env["HTTP_X_FORWARDED_PROTO"] == "https"
return true if env["rack.url_scheme"] == "https"
false
end
CONNECTING = 0
OPEN = 1
CLOSING = 2
CLOSED = 3
attr_reader :env, :url
def initialize(env, event_target, event_loop, protocols)
@env = env
@event_target = event_target
@event_loop = event_loop
@url = ClientSocket.determine_url(@env)
@driver = @driver_started = nil
@close_params = ["", 1006]
@ready_state = CONNECTING
# The driver calls `env`, `url`, and `write`
@driver = ::WebSocket::Driver.rack(self, protocols: protocols)
@driver.on(:open) { |e| open }
@driver.on(:message) { |e| receive_message(e.data) }
@driver.on(:close) { |e| begin_close(e.reason, e.code) }
@driver.on(:error) { |e| emit_error(e.message) }
@stream = ActionCable::Connection::Stream.new(@event_loop, self)
end
def start_driver
return if @driver.nil? || @driver_started
@stream.hijack_rack_socket
if callback = @env["async.callback"]
callback.call([101, {}, @stream])
end
@driver_started = true
@driver.start
end
def rack_response
start_driver
[ -1, {}, [] ]
end
def write(data)
@stream.write(data)
rescue => e
emit_error e.message
end
def transmit(message)
return false if @ready_state > OPEN
case message
when Numeric then @driver.text(message.to_s)
when String then @driver.text(message)
when Array then @driver.binary(message)
else false
end
end
def close(code = nil, reason = nil)
code ||= 1000
reason ||= ""
unless code == 1000 || (code >= 3000 && code <= 4999)
raise ArgumentError, "Failed to execute 'close' on WebSocket: " \
"The code must be either 1000, or between 3000 and 4999. " \
"#{code} is neither."
end
@ready_state = CLOSING unless @ready_state == CLOSED
@driver.close(reason, code)
end
def parse(data)
@driver.parse(data)
end
def client_gone
finalize_close
end
def alive?
@ready_state == OPEN
end
def protocol
@driver.protocol
end
private
def open
return unless @ready_state == CONNECTING
@ready_state = OPEN
@event_target.on_open
end
def receive_message(data)
return unless @ready_state == OPEN
@event_target.on_message(data)
end
def emit_error(message)
return if @ready_state >= CLOSING
@event_target.on_error(message)
end
def begin_close(reason, code)
return if @ready_state == CLOSED
@ready_state = CLOSING
@close_params = [reason, code]
@stream.shutdown if @stream
finalize_close
end
def finalize_close
return if @ready_state == CLOSED
@ready_state = CLOSED
@event_target.on_close(*@close_params)
end
end
end
end
|
