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| | # Copyright (C) all contributors <dtas-all@nongnu.org>
# License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
# frozen_string_literal: true
require 'socket'
require 'io/wait'
# an accepted (client) socket in dtas-player server
class DTAS::UNIXAccepted # :nodoc:
attr_reader :to_io
def initialize(sock)
@to_io = sock
@sbuf = []
end
# public API (for DTAS::Player)
# returns :wait_readable on success
def emit(msg)
if @sbuf.empty?
case rv = @to_io.sendmsg_nonblock(msg, Socket::MSG_EOR, exception: false)
when :wait_writable
@sbuf << msg
rv
else
:wait_readable
end
else
@sbuf << msg
:wait_writable
end
rescue => e
e
end
# flushes pending data if it got buffered
def writable_iter
case @to_io.sendmsg_nonblock(@sbuf[0], Socket::MSG_EOR, exception: false)
when :wait_writable then return :wait_writable
else
@sbuf.shift
@sbuf.empty? ? :wait_readable : :wait_writable
end
rescue => e
e
end
def readable_iter
nread = @to_io.nread
# EOF, assume no spurious wakeups for SOCK_SEQPACKET
return nil if nread == 0
case msg = @to_io.recv_nonblock(nread, exception: false)
when :wait_readable then return msg
when '', nil then return nil # EOF
else
yield(self, msg) # DTAS::Player deals with this
end
@sbuf.empty? ? :wait_readable : :wait_writable
rescue SystemCallError
nil
end
def close
@to_io.close
end
def closed?
@to_io.closed?
end
end
|