Module: Jkr::PlanUtils

Included in:
Jkr::Plan::PlanLoader
Defined in:
lib/jkr/utils.rb

Instance Method Summary collapse

Instance Method Details

#cmd(*args) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 100

def cmd(*args)
  @procdb_mutex ||= Mutex.new
  options = (if args.last.is_a? Hash
               args.pop
             else
               {}
             end)
  options = {
    :wait   => true,
    :timeout => 0,
    :raise_failure => true,
    :stdin  => nil,
    :stdout => [$stdout],
    :stderr => [$stderr]
  }.merge(options)

  if options[:timeout] > 0 && ! options[:wait]
    raise ArgumentError.new("cmd: 'wait' must be true if 'timeout' specified.")
  end

  start_time = Time.now
  pid = nil
  status = nil
  args.flatten!
  args.map!(&:to_s)
  command = args.join(" ")
  barrier = Barrier.new(2)
  process_exited = false

  t = Thread.new {
    pipers = []
    status = POpen4::popen4(command){|p_stdout, p_stderr, p_stdin, p_id|
      pid = p_id
      barrier.wait
      stdouts = if options[:stdout].is_a? Array
                  options[:stdout]
                else
                  [options[:stdout]]
                end
      stderrs = if options[:stderr].is_a? Array
                  options[:stderr]
                else
                  [options[:stderr]]
                end
      pipers << Thread.new{
        target = p_stdout
        timeout_count = 0
        while true
          begin
            if (ready = IO.select([target], [], [], 1))
              ready.first.each do |fd|
                buf = fd.read_nonblock(4096)
                stdouts.each{|out| out.print buf}
              end
              Thread.exit if target.eof?
            else
              if process_exited
                timeout_count += 1
                if timeout_count > 5
                  target.close_read
                  Thread.exit
                end
              end
            end
          rescue IOError => err
            if target.closed?
              Thread.exit
            end
          end
        end
      }
      pipers << Thread.new{
        target = p_stderr
        timeout_count = 0
        while true
          begin
            if (ready = IO.select([target], [], [], 1))
              ready.first.each do |fd|
                buf = fd.read_nonblock(4096)
                stderrs.each{|out| out.print buf}
              end
              Thread.exit if target.eof?
            else
              if process_exited
                timeout_count += 1
                if timeout_count > 5
                  target.close_read
                  Thread.exit
                end
              end
            end
          rescue IOError => err
            if target.closed?
              Thread.exit
            end
          end
        end
      }
      if options[:stdin]
        pipers << Thread.new{
        target = options[:stdin]
        timeout_count = 0
        while true
          begin
            if (ready = IO.select([target], [], [], 1))
              ready.first.each do |fd|
                  buf = fd.read_nonblock(4096)
                  p_stdin.print buf
                end
            else
              if process_exited
                timeout_count += 1
                if timeout_count > 5
                  p_stdin.close_write
                  Thread.exit
                end
              end
            end
          rescue IOError => err
            if target.closed?
              Thread.exit
            end
          end
        end
      }
      end
    }
    pipers.each{|t| t.join}
    raise ArgumentError.new("Invalid command: #{command}") unless status
    procdb_update_status(pid, status)
  }
  barrier.wait
  procdb_spawn(pid, command, t)
  timekeeper = nil

  killed = false
  timekeeper = nil
  if options[:timeout] > 0
    timekeeper = Thread.new do
      sleep(options[:timeout])
      begin
        Process.kill(:INT, pid)
        killed = true
      rescue Errno::ESRCH # No such process
      end
    end
  end
  if options[:wait]
    timekeeper.join if timekeeper
    t.join
    if (! killed) && options[:raise_failure] && status.exitstatus != 0
      raise RuntimeError.new("'#{command}' failed.")
    end
  end
  while ! pid
    sleep 0.001 # do nothing
  end

  pid
end

#procdb ⇒ Object

info about processes spawned by me



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# File 'lib/jkr/utils.rb', line 50

def procdb
  @procdb ||= Hash.new
end

#procdb_get(pid) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 86

def procdb_get(pid)
  @procdb_mutex.synchronize do
    self.procdb[pid]
  end
end

#procdb_get_command(pid) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 95

def procdb_get_command(pid)
  proc = self.procdb_get(pid)
  proc && proc[:command]
end

#procdb_get_status(pid) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 91

def procdb_get_status(pid)
  proc = self.procdb_get(pid)
  proc && proc[:status]
end

#procdb_resetpid(pid) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 72

def procdb_resetpid(pid)
  @procdb_mutex.synchronize do
    if self.procdb[pid]
      self.procdb.delete(pid)
    end
  end
end

#procdb_spawn(pid, command, owner_thread) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 53

def procdb_spawn(pid, command, owner_thread)
  @procdb_mutex.synchronize do
    self.procdb[pid] = {
      :pid => pid,
      :command => command,
      :thread => owner_thread,
      :status => nil
    }
  end
end

#procdb_update_status(pid, status) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 79

def procdb_update_status(pid, status)
  @procdb_mutex.synchronize do
    if self.procdb[pid]
      self.procdb[pid][:status] = status
    end
  end
end

#procdb_waitpid(pid) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 63

def procdb_waitpid(pid)
  t = nil
  @procdb_mutex.synchronize do
    if self.procdb[pid]
      t = self.procdb[pid][:thread]
    end
  end
  t.join if t
end

#use_script(name) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 343

def use_script(name)
  name = name.to_s
  name = name + ".rb" unless name =~ /\.rb$/
  dir = @plan.jkr_env.jkr_script_dir
  path = File.join(dir, name)
  script = File.open(path, "r").read
  self.instance_eval(script, path, 1)
  true
end

#with_process(*args) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 300

def with_process(*args)
  options = (if args.last.is_a? Hash
               args.pop
             else
               {}
             end )
  options = {
    :kill_on_exit => false
  }.merge(options)
  options[:wait] = false

  args.push(options)
  pid = cmd(*args)

  err = nil
  begin
    yield
  rescue Exception => e
    err = e
  end

  if options[:kill_on_exit]
    Process.kill(:INT, pid)
  else
    if err
      begin
        Process.kill(:TERM, pid)
      rescue Exception
      end
    else
      procdb_waitpid(pid)
      status = procdb_get_status(pid)
      unless status && status.exitstatus == 0
        command = procdb_get_command(pid) || "Unknown command"
        raise RuntimeError.new("'#{command}' failed.")
      end
      procdb_resetpid(pid)
    end
  end

  raise err if err
end

#with_process2(*args) ⇒ Object 



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# File 'lib/jkr/utils.rb', line 261

def with_process2(*args)
  options = (if args.last.is_a? Hash
               args.pop
             else
               {}
             end )
  options = {
    :kill_on_exit => false
  }.merge(options)
  
  command = args.flatten.map(&:to_s).join(" ")
  pid = Process.spawn(command)

  err = nil
  begin
    yield
  rescue Exception => e
    err = e
  end

  if options[:kill_on_exit]
    Process.kill(:INT, pid)
  else
    if err
      begin
        Process.kill(:TERM, pid)
      rescue Exception
      end
    else
      begin
        status = Process.waitpid(pid)
        p status
      rescue Errno::ESRCH
      end
    end
  end
  raise err if err
end