discourse/config/initializers/watch_for_restart.rb

31 lines
969 B
Ruby

# this is a trivial graceful restart on touch of tmp/restart.
#
# It simply drains all the requests (waits up to 4 seconds) and issues a HUP
# if you need a more sophisticated cycling restart for multiple thins it will need to be written
#
# This works fine for Discourse.org cause we host our app accross multiple machines, if you hosting
# on a single machine you have a trickier problem at hand as you need to cycle the processes in order
Thread.new do
file = "#{Rails.root}/tmp/restart"
old_time = File.ctime(file).to_i if File.exists? file
wait_seconds = 4
return if $PROGRAM_NAME !~ /thin/
while true
time = File.ctime(file).to_i if File.exists? file
if old_time != time
Rails.logger.info "attempting to reload #{$$} #{$PROGRAM_NAME} in #{wait_seconds} seconds"
$shutdown = true
sleep wait_seconds
Rails.logger.info "restarting #{$$}"
Process.kill("HUP", $$)
return
end
sleep 1
end
end