guard-rails/lib/guard/rails/runner.rb

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require 'fileutils'
module Guard
class RailsRunner
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MAX_WAIT_COUNT = 10
attr_reader :options
def initialize(options)
@options = options
end
def start
kill_unmanaged_pid! if options[:force_run]
run_rails_command!
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wait_for_pid
end
def stop
if File.file?(pid_file)
system %{kill -KILL #{File.read(pid_file).strip}}
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wait_for_no_pid if $?.exitstatus == 0
FileUtils.rm pid_file
end
end
def restart
stop
start
end
def build_rails_command
rails_options = [
'-e', options[:environment],
'-p', options[:port],
'--pid', pid_file
]
rails_options << '-d' if options[:daemon]
rails_options << '-u' if options[:debugger]
rails_options << options[:server] if options[:server]
%{sh -c 'cd #{Dir.pwd} && rails s #{rails_options.join(' ')} &'}
end
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def pid_file
File.expand_path("tmp/pids/#{options[:environment]}.pid")
end
def pid
File.file?(pid_file) ? File.read(pid_file).to_i : nil
end
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def sleep_time
options[:timeout].to_f / MAX_WAIT_COUNT.to_f
end
private
def run_rails_command!
system build_rails_command
end
def has_pid?
File.file?(pid_file)
end
def wait_for_pid_action
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sleep sleep_time
end
def kill_unmanaged_pid!
if pid = unmanaged_pid
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system %{kill -KILL #{pid}}
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FileUtils.rm pid_file
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wait_for_no_pid
end
end
def unmanaged_pid
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%x{lsof -n -i TCP:#{options[:port]}}.each_line { |line|
if line["*:#{options[:port]} "]
return line.split("\s")[1]
end
}
nil
end
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private
def wait_for_pid
wait_for_pid_loop
end
def wait_for_no_pid
wait_for_pid_loop(false)
end
def wait_for_pid_loop(check_for_existince = true)
count = 0
while !(check_for_existince ? has_pid? : !has_pid?) && count < MAX_WAIT_COUNT
wait_for_pid_action
count += 1
end
!(count == MAX_WAIT_COUNT)
end
end
end