Class: ProxyMgr::ProcessManager

Inherits:
Object
  • Object
show all
Includes:
Callbacks
Defined in:
lib/proxymgr/process_manager.rb,
lib/proxymgr/process_manager/signal_handler.rb

Defined Under Namespace

Classes: SignalHandler

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Callbacks

#call

Constructor Details

#initialize(cmd, args = [], opts = {}) ⇒ ProcessManager

Returns a new instance of ProcessManager.



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# File 'lib/proxymgr/process_manager.rb', line 10

def initialize(cmd, args = [], opts = {})
  @cmd        = cmd
  @args       = args
  @pid        = nil
  @exit_code  = nil

  @timeout    = opts[:timeout] || 10
  @setsid     = opts[:setsid] || true
  @fds        = opts[:fds] || []

  @io_handler = nil

  callbacks :on_stdout, :on_stderr, :on_stop
end

Instance Attribute Details

#exit_code ⇒ Object (readonly)

Returns the value of attribute exit_code.



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# File 'lib/proxymgr/process_manager.rb', line 8

def exit_code
  @exit_code
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/proxymgr/process_manager.rb', line 8

def pid
  @pid
end

Class Method Details

.register(pid, &blk) ⇒ Object 



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# File 'lib/proxymgr/process_manager.rb', line 96

def self.register(pid, &blk)
  @handler ||= SignalHandler.new
  @handler.register(pid, &blk)
end

Instance Method Details

#start ⇒ Object 



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# File 'lib/proxymgr/process_manager.rb', line 25

def start
  stdout_read, stdout_write = IO.pipe
  stderr_read, stderr_write = IO.pipe
  sync_pipe                 = IO.pipe

  @pid = Process.fork do
    $stdout.reopen stdout_write
    $stderr.reopen stderr_write
    [stderr_read, stdout_read].each(&:close)
    begin
      Process.setsid if @setsid
    rescue Errno::EPERM
    end
    sync_pipe[0].read(1)
    3.upto(Platform.max_fd).each do |fd|
      begin
        IO.for_fd(fd).close unless @fds.include? fd
      rescue ArgumentError, Errno::EBADF
      end
    end
    Process.exec(*([@cmd] + @args), :close_others => false)
  end
  self.class.register(@pid) { |status| call(:on_stop, status) }
  sync_pipe[1].write(1)
  ([stdout_write, stderr_write] + sync_pipe).each(&:close)

  @thread = Thread.new do
    stop = false
    fdset = [stdout_read, stderr_read]
    until stop
      r = IO.select(fdset, [], fdset).first
      out = {}
      r.each do |pipe|
        stream = pipe == stdout_read ? :stdout : :stderr
        buf = out[stream] ||= ''
        begin
          loop { buf << pipe.read_nonblock(4096) }
        rescue Errno::EWOULDBLOCK
        rescue EOFError
          stop = true
        end
      end
      out.each do |stream, buf|
        buf.split(/\n/).each { |line| call("on_#{stream}".to_sym, line) }
      end
    end
    fdset.each(&:close)
  end
  @thread.abort_on_exception = true

  @pid
end

#stop ⇒ Object 



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# File 'lib/proxymgr/process_manager.rb', line 78

def stop
  Process.kill('TERM', @pid)
  begin
    Timeout.timeout(@timeout) { wait }
  rescue Timeout::Error
    Process.kill('KILL', @pid)
  end
  @thread.join if @thread
end

#wait ⇒ Object 



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# File 'lib/proxymgr/process_manager.rb', line 88

def wait
  begin
    _pid, result = Process.waitpid2(@pid)
    @exit_code = result.exitstatus || result.termsig
  rescue Errno::ECHILD
  end
end