45 lines
1.4 KiB
Ruby
45 lines
1.4 KiB
Ruby
# frozen_string_literal: true
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# this is a trivial graceful restart on touch of tmp/restart.
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#
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# It simply drains all the requests (waits up to 4 seconds) and issues a HUP
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# if you need a more sophisticated cycling restart for multiple thins it will need to be written
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#
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# This works fine for Discourse.org cause we host our app across multiple machines, if you hosting
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# on a single machine you have a trickier problem at hand as you need to cycle the processes in order
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#
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# VIM users rejoice, if you add this to your .vimrc CTRL-a will restart puma:
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# nmap <C-a> <Esc>:!touch tmp/restart<CR><CR>
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Thread.new do
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file = "#{Rails.root}/tmp/restart"
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old_time = File.ctime(file).to_i if File.exists? file
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wait_seconds = 4
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if Rails.env.development? && $PROGRAM_NAME =~ /puma/
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require 'listen'
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time = nil
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begin
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listener = Listen.to("#{Rails.root}/tmp", only: /restart/) do
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time = File.ctime(file).to_i if File.exists? file
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if old_time != time
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Rails.logger.info "attempting to reload #{$$} #{$PROGRAM_NAME} in #{wait_seconds} seconds"
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$shutdown = true # rubocop:disable Style/GlobalVars
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sleep wait_seconds
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Rails.logger.info "restarting #{$$}"
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Process.kill("USR2", $$)
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end
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end
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listener.start
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sleep
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rescue => e
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puts "Failed to watch for restart, this probably means the old postgres directory is in tmp, remove it #{e}"
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end
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end
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end
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