Class: Pwrake::Executor

Inherits:
Object
  • Object
show all
Defined in:
lib/pwrake/worker/executor.rb

Constant Summary collapse

LIST = 
{}
CHARS = 
'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
TLEN = 
32

Instance Method Summary collapse

Constructor Details

#initialize(dir_class, id, shell_cmd, shell_rc) ⇒ Executor

Returns a new instance of Executor.



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# File 'lib/pwrake/worker/executor.rb', line 9

def initialize(dir_class,id,shell_cmd,shell_rc)
  @id = id
  @shell_rc = shell_rc
  @shell_cmd = shell_cmd || ENV['SHELL'] || '/bin/sh'
  @terminator = ""
  TLEN.times{ @terminator << CHARS[rand(CHARS.length)] }
  @out = Writer.instance
  @log = LogExecutor.instance
  @queue = Queue.new
  @dir = dir_class.new
  @spawn_in, @sh_in = IO.pipe
  @sh_out, @spawn_out = IO.pipe
  @sh_err, @spawn_err = IO.pipe
  LIST[@id] = self
  @exec_thread = start_exec_thread
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/pwrake/worker/executor.rb', line 142

def close
  execute(nil)  # threads end
end

#execute(cmd) ⇒ Object 



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# File 'lib/pwrake/worker/executor.rb', line 26

def execute(cmd)
  @queue.enq(cmd)
end

#join ⇒ Object 



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# File 'lib/pwrake/worker/executor.rb', line 146

def join
  LIST.delete(@id)
  @exec_thread.join(15) if @exec_thread
end

#kill(sig) ⇒ Object 



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# File 'lib/pwrake/worker/executor.rb', line 151

def kill(sig)
  @queue.clear
  if @pid
    # kill process group
    s = `ps ho pid --ppid=#{@pid}`
    s.each_line do |x|
      pid = x.to_i
      Process.kill(sig,pid)
      @log.warn "Executor(id=#{@id})#kill pid=#{pid} sig=#{sig}"
    end
    if s.empty?
      @log.warn "Executor(id=#{@id})#kill nothing killed"
    end
  end
  @spawn_out.flush
  @spawn_err.flush
end

#run(cmd) ⇒ Object 



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# File 'lib/pwrake/worker/executor.rb', line 74

def run(cmd)
  case cmd
  when Proc
    cmd.call
  when "cd"
    @dir.cd
    run_command("cd "+@dir.current)
    #
  when /^cd\s+(.*)$/
    @dir.cd($1)
    run_command("cd "+@dir.current)
    #
  when /^exit\b/
    close
    @out.puts "#{@id}:exit"
    #
  when String
    run_command(cmd)
    #
  else
    raise RuntimeError,"invalid cmd: #{cmd.inspect}"
  end
end

#run_command(cmd) ⇒ Object 



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# File 'lib/pwrake/worker/executor.rb', line 102

def run_command(cmd)
  run_command_main(cmd){|s| @out.puts s}
end

#run_command_main(cmd) {|"#{@id}:z:#{status}"| ... } ⇒ Object

Yields:

  • ("#{@id}:z:#{status}") 


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# File 'lib/pwrake/worker/executor.rb', line 106

def run_command_main(cmd)
  if /\\$/ =~ cmd  # command line continues
    @sh_in.puts(cmd)
    @sh_in.flush
    return
  end
  term = "\necho '#{@terminator}':$? \necho '#{@terminator}' 1>&2"
  @sh_in.puts(cmd+term)
  @sh_in.flush
  status = ""
  io_set = [@sh_out,@sh_err]
  loop do
    io_sel, = IO.select(io_set,nil,nil)
    for io in io_sel
      s = io.gets.chomp
      case io
      when @sh_out
        if s[0,TLEN] == @terminator
          status = s[TLEN+1..-1]
          io_set.delete(@sh_out)
        else
          yield "#{@id}:o:"+s
        end
      when @sh_err
        if s[0,TLEN] == @terminator
          io_set.delete(@sh_err)
        else
          yield "#{@id}:e:"+s
        end
      end
    end
    break if io_set.empty?
  end
  yield "#{@id}:z:#{status}"
end

#run_rc(cmd) ⇒ Object 



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# File 'lib/pwrake/worker/executor.rb', line 98

def run_rc(cmd)
  run_command_main(cmd){|s| @log.info "<"+s if @log}
end

#start_exec_thread ⇒ Object 



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# File 'lib/pwrake/worker/executor.rb', line 30

def start_exec_thread
  Thread.new do
    begin
      @dir.open
      @dir.open_messages.each{|m| @log.info(m)}
      @pid = Kernel.spawn(@shell_cmd,
                          :out=>@spawn_out,
                          :err=>@spawn_err,
                          :in=>@spawn_in,
                          :chdir=>@dir.current)
      begin
        @out.puts "#{@id}:open"
        @shell_rc.each do |cmd|
          run_rc(cmd)
        end
        while cmd = @queue.deq
          run(cmd)
        end
        @sh_in.puts("exit")
        @sh_in.flush
      ensure
        status = nil
        begin
          Timeout.timeout(5){
            pid,status = Process.waitpid2(@pid)
          }
        rescue => exc
          @log.error ([exc.to_s]+exc.backtrace).join("\n")
          @log.info("#{@id}:kill INT sh @pid=#{@pid}")
          Process.kill("INT",@pid)
          pid,status = Process.waitpid2(@pid)
        end
        @log.info("shell exit status: "+status.inspect)
      end
    rescue => exc
      @out.puts "#{@id}:exc:#{exc}"
      @log.error ([exc.to_s]+exc.backtrace).join("\n")
    ensure
      @dir.close_messages.each{|m| @log.info(m)}
      @dir.close
    end
  end
end