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| | # Copyright (C) 2013, Eric Wong <normalperson@yhbt.net> and all contributors
# License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
# included in Yahns::HttpClient
#
# this provides the ability to expire idle clients once we hit a soft limit
# on idle clients
#
# we absolutely DO NOT issue IO#close in here, only BasicSocket#shutdown
module Yahns::ClientExpire # :nodoc:
def yahns_expire(timeout) # rarely called
return 0 if closed? # still racy, but avoid the exception in most cases
info = Raindrops::TCP_Info.new(self)
return 0 if info.state != 1 # TCP_ESTABLISHED == 1
# Linux struct tcp_info timers are in milliseconds
timeout *= 1000
send_timedout = !!(info.last_data_sent > timeout)
# tcpi_last_data_recv is not valid unless tcpi_ato (ACK timeout) is set
if 0 == info.ato
sd = send_timedout && (info.last_ack_recv > timeout)
else
sd = send_timedout && (info.last_data_recv > timeout)
end
if sd
shutdown
1
else
0
end
# we also do not expire UNIX domain sockets
# (since those are the most trusted of local clients)
# the IO#closed? check is racy
rescue
0
end
end
|