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# frozen_string_literal: true
require "thread"
module ActionCable
module Connection
#--
# This class is heavily based on faye-websocket-ruby
#
# Copyright (c) 2010-2015 James Coglan
class Stream # :nodoc:
def initialize(event_loop, socket)
@event_loop = event_loop
@socket_object = socket
@stream_send = socket.env["stream.send"]
@rack_hijack_io = nil
@write_lock = Mutex.new
@write_head = nil
@write_buffer = Queue.new
end
def each(&callback)
@stream_send ||= callback
end
def close
shutdown
@socket_object.client_gone
end
def shutdown
clean_rack_hijack
end
def write(data)
if @stream_send
return @stream_send.call(data)
end
if @write_lock.try_lock
begin
if @write_head.nil? && @write_buffer.empty?
written = @rack_hijack_io.write_nonblock(data, exception: false)
case written
when :wait_writable
# proceed below
when data.bytesize
return data.bytesize
else
@write_head = data.byteslice(written, data.bytesize)
@event_loop.writes_pending @rack_hijack_io
return data.bytesize
end
end
ensure
@write_lock.unlock
end
end
@write_buffer << data
@event_loop.writes_pending @rack_hijack_io
data.bytesize
rescue EOFError, Errno::ECONNRESET
@socket_object.client_gone
end
def flush_write_buffer
@write_lock.synchronize do
loop do
if @write_head.nil?
return true if @write_buffer.empty?
@write_head = @write_buffer.pop
end
written = @rack_hijack_io.write_nonblock(@write_head, exception: false)
case written
when :wait_writable
return false
when @write_head.bytesize
@write_head = nil
else
@write_head = @write_head.byteslice(written, @write_head.bytesize)
return false
end
end
end
end
def receive(data)
@socket_object.parse(data)
end
def hijack_rack_socket
return unless @socket_object.env["rack.hijack"]
@socket_object.env["rack.hijack"].call
@rack_hijack_io = @socket_object.env["rack.hijack_io"]
@event_loop.attach(@rack_hijack_io, self)
end
private
def clean_rack_hijack
return unless @rack_hijack_io
@event_loop.detach(@rack_hijack_io, self)
@rack_hijack_io = nil
end
end
end
end
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