Class: Daemons::Application
- Inherits:
-
Object
- Object
- Daemons::Application
- Defined in:
- lib/daemons/application.rb
Instance Attribute Summary collapse
-
#app_argv ⇒ Object
Returns the value of attribute app_argv.
-
#controller_argv ⇒ Object
Returns the value of attribute controller_argv.
-
#group ⇒ Object
readonly
the ApplicationGroup the application belongs to.
-
#options ⇒ Object
readonly
my private options.
-
#pid ⇒ Object
readonly
the Pid instance belonging to this application.
Instance Method Summary collapse
-
#exception_log ⇒ Object
This is a nice little function for debugging purposes: In case a multi-threaded ruby script exits due to an uncaught exception it may be difficult to find out where the exception came from because one cannot catch exceptions that are thrown in threads other than the main thread.
-
#initialize(group, add_options = {}, pid = nil) ⇒ Application
constructor
A new instance of Application.
- #logfile ⇒ Object
- #pidfile_dir ⇒ Object
-
#running? ⇒ Boolean
This function implements a (probably too simle) method to detect whether the program with the pid found in the pid-file is still running.
- #script ⇒ Object
- #show_status ⇒ Object
- #start ⇒ Object
- #start_exec ⇒ Object
- #start_load ⇒ Object
-
#start_none ⇒ Object
this function is only used to daemonize the currently running process (Daemons.daemonize).
- #start_proc ⇒ Object
- #stop ⇒ Object
- #zap ⇒ Object
- #zap! ⇒ Object
Constructor Details
#initialize(group, add_options = {}, pid = nil) ⇒ Application
Returns a new instance of Application.
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# File 'lib/daemons/application.rb', line 22 def initialize(group, = {}, pid = nil) @group = group @options = group..dup @options.update() unless @pid = pid if dir = pidfile_dir @pid = PidFile.new(dir, @group.app_name, @group.multiple) else @pid = PidMem.new end end end |
Instance Attribute Details
#app_argv ⇒ Object
Returns the value of attribute app_argv.
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# File 'lib/daemons/application.rb', line 9 def app_argv @app_argv end |
#controller_argv ⇒ Object
Returns the value of attribute controller_argv.
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# File 'lib/daemons/application.rb', line 10 def controller_argv @controller_argv end |
#group ⇒ Object (readonly)
the ApplicationGroup the application belongs to
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# File 'lib/daemons/application.rb', line 16 def group @group end |
#options ⇒ Object (readonly)
my private options
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# File 'lib/daemons/application.rb', line 19 def @options end |
#pid ⇒ Object (readonly)
the Pid instance belonging to this application
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# File 'lib/daemons/application.rb', line 13 def pid @pid end |
Instance Method Details
#exception_log ⇒ Object
This is a nice little function for debugging purposes: In case a multi-threaded ruby script exits due to an uncaught exception it may be difficult to find out where the exception came from because one cannot catch exceptions that are thrown in threads other than the main thread.
This function searches for all exceptions in memory and outputs them to STDERR (if it is connected) and to a log file in the pid-file directory.
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# File 'lib/daemons/application.rb', line 258 def exception_log require 'logger' l_file = Logger.new(File.join(pidfile_dir(), @group.app_name + '.log')) # the code below only logs the last exception # e = nil # # ObjectSpace.each_object {|o| # if ::Exception === o # e = o # end # } # # l_file.error e # l_file.close # this code logs every exception found in memory ObjectSpace.each_object {|o| if ::Exception === o l_file.error o end } l_file.close end |
#logfile ⇒ Object
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# File 'lib/daemons/application.rb', line 44 def logfile ([:log_output] && pidfile_dir()) ? File.join(pidfile_dir(), @group.app_name + '.output') : nil end |
#pidfile_dir ⇒ Object
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# File 'lib/daemons/application.rb', line 40 def pidfile_dir Pid.dir(@dir_mode || @group.dir_mode, @dir || @group.dir, @script || @group.script) end |
#running? ⇒ Boolean
This function implements a (probably too simle) method to detect whether the program with the pid found in the pid-file is still running. It just searches for the pid in the output of ps ax
, which is probably not a good idea in some cases. Alternatives would be to use a direct access method the unix process control system.
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# File 'lib/daemons/application.rb', line 331 def running? if @pid.exists? return Pid.running?(@pid.pid) end return false end |
#script ⇒ Object
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# File 'lib/daemons/application.rb', line 36 def script @script || @group.script end |
#show_status ⇒ Object
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# File 'lib/daemons/application.rb', line 318 def show_status running = self.running? puts "#{self.group.app_name}: #{running ? '' : 'not '}running#{(running and @pid.exists?) ? ' [pid ' + @pid.pid.to_s + ']' : ''}#{(@pid.exists? and not running) ? ' (but pid-file exists: ' + @pid.pid.to_s + ')' : ''}" end |
#start ⇒ Object
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# File 'lib/daemons/application.rb', line 214 def start @group.create_monitor(@group.applications[0] || self) unless [:ontop] # we don't monitor applications in the foreground case [:mode] when :none # this is only used to daemonize the currently running process start_none when :exec start_exec when :load start_load when :proc start_proc else start_load end end |
#start_exec ⇒ Object
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# File 'lib/daemons/application.rb', line 89 def start_exec unless [:ontop] Daemonize.daemonize(logfile, @group.app_name) else Daemonize.simulate(logfile) end # note that we cannot remove the pid file if we run in :ontop mode (i.e. 'ruby ctrl_exec.rb run') @pid.pid = Process.pid ENV['DAEMONS_ARGV'] = @controller_argv.join(' ') # haven't tested yet if this is really passed to the exec'd process... Kernel.exec(script(), *ARGV) end |
#start_load ⇒ Object
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# File 'lib/daemons/application.rb', line 105 def start_load unless [:ontop] Daemonize.daemonize(logfile, @group.app_name) else Daemonize.simulate(logfile) end @pid.pid = Process.pid # We need this to remove the pid-file if the applications exits by itself. # Note that <tt>at_text</tt> will only be run if the applications exits by calling # <tt>exit</tt>, and not if it calls <tt>exit!</tt> (so please don't call <tt>exit!</tt> # in your application! # at_exit { @pid.cleanup rescue nil # If the option <tt>:backtrace</tt> is used and the application did exit by itself # create a exception log. if [:backtrace] and not [:ontop] and not $daemons_sigterm exception_log() rescue nil end } # This part is needed to remove the pid-file if the application is killed by # daemons or manually by the user. # Note that the applications is not supposed to overwrite the signal handler for # 'TERM'. # trap('TERM') { @pid.cleanup rescue nil $daemons_sigterm = true exit } # Now we really start the script... $DAEMONS_ARGV = @controller_argv ENV['DAEMONS_ARGV'] = @controller_argv.join(' ') ARGV.clear ARGV.concat @app_argv if @app_argv # TODO: begin - rescue - end around this and exception logging load script() end |
#start_none ⇒ Object
this function is only used to daemonize the currently running process (Daemons.daemonize)
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# File 'lib/daemons/application.rb', line 50 def start_none unless [:ontop] Daemonize.daemonize(nil, @group.app_name) #(logfile) else Daemonize.simulate end @pid.pid = Process.pid # We need this to remove the pid-file if the applications exits by itself. # Note that <tt>at_text</tt> will only be run if the applications exits by calling # <tt>exit</tt>, and not if it calls <tt>exit!</tt> (so please don't call <tt>exit!</tt> # in your application! # at_exit { @pid.cleanup rescue nil # If the option <tt>:backtrace</tt> is used and the application did exit by itself # create a exception log. if [:backtrace] and not [:ontop] and not $daemons_sigterm exception_log() rescue nil end } # This part is needed to remove the pid-file if the application is killed by # daemons or manually by the user. # Note that the applications is not supposed to overwrite the signal handler for # 'TERM'. # trap('TERM') { @pid.cleanup rescue nil $daemons_sigterm = true exit } end |
#start_proc ⇒ Object
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# File 'lib/daemons/application.rb', line 154 def start_proc return unless p = [:proc] myproc = proc do # We need this to remove the pid-file if the applications exits by itself. # Note that <tt>at_text</tt> will only be run if the applications exits by calling # <tt>exit</tt>, and not if it calls <tt>exit!</tt> (so please don't call <tt>exit!</tt> # in your application! # at_exit { @pid.cleanup rescue nil # If the option <tt>:backtrace</tt> is used and the application did exit by itself # create a exception log. if [:backtrace] and not [:ontop] and not $daemons_sigterm exception_log() rescue nil end } # This part is needed to remove the pid-file if the application is killed by # daemons or manually by the user. # Note that the applications is not supposed to overwrite the signal handler for # 'TERM'. # trap('TERM') { @pid.cleanup rescue nil $daemons_sigterm = true exit } p.call() end unless [:ontop] @pid.pid = Daemonize.call_as_daemon(myproc, logfile, @group.app_name) else Daemonize.simulate(logfile) @pid.pid = Process.pid myproc.call # why did we use this?? # Thread.new(&options[:proc]) # why did we use the code below?? # unless pid = Process.fork # @pid.pid = pid # Daemonize.simulate(logfile) # options[:proc].call # exit # else # Process.detach(@pid.pid) # end end end |
#stop ⇒ Object
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# File 'lib/daemons/application.rb', line 287 def stop if [:force] and not running? self.zap return end # Catch errors when trying to kill a process that doesn't # exist. This happens when the process quits and hasn't been # restarted by the monitor yet. By catching the error, we allow the # pid file clean-up to occur. begin Process.kill('TERM', @pid.pid) rescue Errno::ESRCH => e puts "#{e} #{@pid.pid}" puts "deleting pid-file." end # We try to remove the pid-files by ourselves, in case the application # didn't clean it up. @pid.cleanup rescue nil end |
#zap ⇒ Object
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# File 'lib/daemons/application.rb', line 310 def zap @pid.cleanup end |
#zap! ⇒ Object
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# File 'lib/daemons/application.rb', line 314 def zap! @pid.cleanup rescue nil end |