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module Daemons
class Optparse
attr_reader :usage
def initialize(controller)
@controller = controller
@options = {}
@opts = OptionParser.new do |opts|
opts.banner = ''
opts.on('-t', '--ontop', 'Stay on top (does not daemonize)') do |t|
@options[:ontop] = t
end
opts.on('-s', '--shush', 'Silent mode (no output to the terminal)') do |t|
@options[:shush] = t
end
opts.on('-f', '--force', 'Force operation') do |t|
@options[:force] = t
end
opts.on('-n', '--no_wait', 'Do not wait for processes to stop') do |t|
@options[:no_wait] = t
end
opts.on('-w', '--force_kill_waittime SECONDS', Integer, 'Maximum time to wait for processes to stop before force-killing') do |t|
@options[:force_kill_waittime] = t
end
opts.on('--signals_and_waits STRING', String, 'which signal to use to stop and how long to wait e.g. TERM:20|KILL:20') do |t|
@options[:signals_and_waits] = t
end
opts.on('--pid_delimiter STRING', 'Text used to separate process number in full process name and pid-file name') do |value|
@options[:pid_delimiter] = value
end
opts.separator ''
opts.separator 'Common options:'
opts.on('-l', '--log_output', 'Enable input/output stream redirection') do |value|
@options[:log_output] = value
end
opts.on('--logfilename FILE', String, 'Custom log file name for exceptions') do |value|
@options[:logfilename] = value
end
opts.on('--output_logfilename FILE', String, 'Custom file name for input/output stream redirection log') do |value|
@options[:output_logfilename] = value
end
opts.on('--log_dir DIR', String, 'Directory for log files') do |value|
@options[:log_dir] = value
end
opts.on('--syslog', 'Enable output redirction into SYSLOG instead of a file') do |value|
@options[:log_output_syslog] = value
end
# No argument, shows at tail. This will print an options summary
opts.on_tail('-h', '--help', 'Show this message') do
controller.print_usage
exit
end
# Switch to print the version.
opts.on_tail('--version', 'Show version') do
puts "daemons version #{Daemons::VERSION}"
exit
end
end
begin
@usage = @opts.to_s
rescue ::Exception # work around a bug in ruby 1.9
@usage = <<END
-t, --ontop Stay on top (does not daemonize)
-f, --force Force operation
-n, --no_wait Do not wait for processes to stop
Common options:
-h, --help Show this message
--version Show version
END
end
end
# Return a hash describing the options.
#
def parse(args)
# The options specified on the command line will be collected in *options*.
# We set default values here.
@opts.parse(args)
@options
end
end
class Controller
def print_usage
puts <<-USAGE.gsub(/^ {6}/, '')
Usage: #{@app_name} <command> <options> -- <application options>
* where <command> is one of:
start start an instance of the application
stop stop all instances of the application
restart stop all instances and restart them afterwards
reload send a SIGHUP to all instances of the application
run run the application in the foreground (same as start -t)
zap set the application to a stopped state
status show status (PID) of application instances
* and where <options> may contain several of the following:
#{@optparse.usage}
USAGE
end
def catch_exceptions(&block)
begin
block.call
rescue CmdException, OptionParser::ParseError => e
puts "ERROR: #{e}"
puts
print_usage
rescue RuntimeException => e
puts "ERROR: #{e}"
end
end
end
end
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