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| | # Copyright (C) 2013-2014, Eric Wong <e@80x24.org> and all contributors
# License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
require 'socket'
require 'io/wait'
require_relative 'compat_rbx'
class DTAS::UNIXAccepted # :nodoc:
attr_reader :to_io
def initialize(sock)
@to_io = sock
@send_buf = []
end
# public API (for DTAS::Player)
# returns :wait_readable on success
def emit(msg)
buffered = @send_buf.size
if buffered == 0
begin
@to_io.sendmsg_nonblock(msg, Socket::MSG_EOR)
return :wait_readable
rescue Errno::EAGAIN
@send_buf << msg
return :wait_writable
rescue => e
return e
end
elsif buffered > 100
return RuntimeError.new("too many messages buffered")
else # buffered > 0
@send_buf << msg
return :wait_writable
end
end
# flushes pending data if it got buffered
def writable_iter
begin
msg = @send_buf.shift or return :wait_readable
@to_io.send_nonblock(msg, Socket::MSG_EOR)
rescue Errno::EAGAIN
@send_buf.unshift(msg)
return :wait_writable
rescue => e
return e
end while true
end
def readable_iter
io = @to_io
nread = io.nread
# EOF, assume no spurious wakeups for SOCK_SEQPACKET
return nil if nread == 0
begin
begin
msg, _, _ = io.recvmsg_nonblock(nread, 0, 0)
rescue Errno::EAGAIN
return :wait_readable
rescue EOFError, SystemCallError
return nil
end
yield(self, msg) # DTAS::Player deals with this
nread = io.nread
end while nread > 0
:wait_readable
end
def close
@to_io.close
end
def closed?
@to_io.closed?
end
end
|