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Merge pull request #202 from bensheldon/daemonize
Add daemonize option to CLI
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Original file line number | Diff line number | Diff line change |
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module GoodJob | ||
# | ||
# Manages daemonization of the current process. | ||
# | ||
class Daemon | ||
# The path of the generated pidfile. | ||
# @return [Pathname,String] | ||
attr_reader :pidfile | ||
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# @param pidfile [Pathname,String] Pidfile path | ||
def initialize(pidfile:) | ||
@pidfile = pidfile | ||
end | ||
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# Daemonizes the current process and writes out a pidfile. | ||
def daemonize | ||
check_pid | ||
Process.daemon | ||
write_pid | ||
end | ||
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private | ||
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def write_pid | ||
File.open(pidfile, ::File::CREAT | ::File::EXCL | ::File::WRONLY) { |f| f.write(Process.pid.to_s) } | ||
at_exit { File.delete(pidfile) if File.exist?(pidfile) } | ||
rescue Errno::EEXIST | ||
check_pid | ||
retry | ||
end | ||
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def delete_pid | ||
File.delete(pidfile) if File.exist?(pidfile) | ||
end | ||
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def check_pid | ||
case pid_status(pidfile) | ||
when :running, :not_owned | ||
abort "A server is already running. Check #{pidfile}" | ||
when :dead | ||
File.delete(pidfile) | ||
end | ||
end | ||
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def pid_status(pidfile) | ||
return :exited unless File.exist?(pidfile) | ||
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pid = ::File.read(pidfile).to_i | ||
return :dead if pid.zero? | ||
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Process.kill(0, pid) # check process status | ||
:running | ||
rescue Errno::ESRCH | ||
:dead | ||
rescue Errno::EPERM | ||
:not_owned | ||
end | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
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require 'rails_helper' | ||
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RSpec.describe GoodJob::Daemon, skip_if_java: true do | ||
let(:pidfile) { Rails.application.root.join('tmp/pidfile.pid') } | ||
let(:daemon) { described_class.new(pidfile: pidfile) } | ||
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before do | ||
FileUtils.mkdir_p Rails.application.root.join('tmp') | ||
allow(Process).to receive(:daemon) | ||
allow(daemon).to receive(:at_exit) | ||
end | ||
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after do | ||
File.delete(pidfile) | ||
end | ||
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describe '#daemonize' do | ||
it 'calls Process.daemon' do | ||
daemon.daemonize | ||
expect(Process).to have_received :daemon | ||
end | ||
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it 'writes a pidfile' do | ||
expect do | ||
daemon.daemonize | ||
end.to change { Pathname.new(pidfile).exist? }.from(false).to(true) | ||
end | ||
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context 'when a pidfile already exists' do | ||
before do | ||
File.open(pidfile, "w") { |f| f.write(Process.pid) } | ||
end | ||
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it 'aborts with a message' do | ||
expect { daemon.daemonize }.to output("A server is already running. Check #{pidfile}\n").to_stderr.and raise_error SystemExit | ||
end | ||
end | ||
end | ||
end |