Class: Daemonizer::Worker
- Inherits:
-
Object
- Object
- Daemonizer::Worker
- Defined in:
- lib/daemonizer/worker.rb
Instance Attribute Summary collapse
-
#name ⇒ Object
readonly
Returns the value of attribute name.
-
#pid ⇒ Object
readonly
Returns the value of attribute pid.
Instance Method Summary collapse
-
#initialize(name, pm, worker_id, &blk) ⇒ Worker
constructor
A new instance of Worker.
- #run ⇒ Object
- #running?(verbose = false) ⇒ Boolean
- #shutdown? ⇒ Boolean
- #stop(force = false) ⇒ Object
Constructor Details
#initialize(name, pm, worker_id, &blk) ⇒ Worker
Returns a new instance of Worker.
6 7 8 9 10 11 12 13 |
# File 'lib/daemonizer/worker.rb', line 6 def initialize(name, pm, worker_id, &blk) raise ArgumentError, "Need a worker block!" unless block_given? @name = name @pm = pm @worker_block = blk @worker_id = worker_id end |
Instance Attribute Details
#name ⇒ Object (readonly)
Returns the value of attribute name.
3 4 5 |
# File 'lib/daemonizer/worker.rb', line 3 def name @name end |
#pid ⇒ Object (readonly)
Returns the value of attribute pid.
4 5 6 |
# File 'lib/daemonizer/worker.rb', line 4 def pid @pid end |
Instance Method Details
#run ⇒ Object
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 |
# File 'lib/daemonizer/worker.rb', line 19 def run return if shutdown? Daemonizer.logger.info "Forking..." @pid = Kernel.fork do Dir.chdir '/' File.umask 0000 STDIN.reopen '/dev/null' STDOUT.reopen '/dev/null', 'a' STDERR.reopen STDOUT @pid = Process.pid GDC.set "#{@pid}/#{@worker_id}" Daemonizer.logger.info "Forked..." normal_exit = false begin $0 = "#{@name} worker: instance #{@worker_id}\0" @worker_block.call(@worker_id) normal_exit = true exit(0) rescue Exception => e = SystemExit === e ? "exit(#{e.status})" : e.to_s if SystemExit === e and e.success? if normal_exit Daemonizer.logger.info("Worker finished: normal return") else Daemonizer.logger.error("Worker exited: #{} at #{e.backtrace.first}") end else Daemonizer.logger.error("Worker exited with error: #{}\n #{e.backtrace.join("\n ")}") end Daemonizer.logger.debug("Terminating #{@name} worker: #{@pid}") end end rescue Exception => e Daemonizer.logger.error("Exception from worker: #{e} at #{e.backtrace.first}") end |
#running?(verbose = false) ⇒ Boolean
58 59 60 61 62 63 64 65 66 67 68 69 |
# File 'lib/daemonizer/worker.rb', line 58 def running?(verbose = false) return false unless @pid begin Process.waitpid(@pid, Process::WNOHANG) res = Process.kill(0, @pid) Daemonizer.logger.debug("KILL(#{@pid}) = #{res}") if verbose return true rescue Errno::ESRCH, Errno::ECHILD, Errno::EPERM => e Daemonizer.logger.error("Exception from kill: #{e} at #{e.backtrace.first}") if verbose return false end end |
#shutdown? ⇒ Boolean
15 16 17 |
# File 'lib/daemonizer/worker.rb', line 15 def shutdown? @pm.shutdown? end |
#stop(force = false) ⇒ Object
71 72 73 74 75 76 77 78 79 |
# File 'lib/daemonizer/worker.rb', line 71 def stop(force = false) begin sig = force ? 'SIGKILL' : 'SIGTERM' Daemonizer.logger.debug("Sending #{sig} to ##{@pid}") Process.kill(sig, @pid) rescue Errno::ESRCH, Errno::ECHILD, Errno::EPERM=> e Daemonizer.logger.error("Exception from kill: #{e} at #{e.backtrace.first}") end end |