Class: PRCS::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/prcs.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/prcs.rb', line 12

def initialize(command)
  @command = command
  @process = nil
  @stdout = nil
  @stderr = nil

  @external_queues = {}.tap do |it|
    it[:stdout] = Queue.new
    it[:stderr] = Queue.new
  end
  @logcollectors = {}
end

Instance Attribute Details

#command ⇒ Object (readonly)

Returns the value of attribute command.



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# File 'lib/prcs.rb', line 10

def command
  @command
end

Instance Method Details

#alive? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prcs.rb', line 148

def alive?
  @process.alive?
end

#exit_code ⇒ Object 



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# File 'lib/prcs.rb', line 156

def exit_code
  @process.exit_code
end

#exited? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prcs.rb', line 152

def exited?
  @process.exited?
end

#kill!(timeout = 15) ⇒ Object 



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# File 'lib/prcs.rb', line 85

def kill!(timeout = 15)
  @logcollectors.values.each do |collector_thread|
    collector_thread[:running] = false
  end

  begin
    @process.poll_for_exit(timeout)
  rescue ChildProcess::TimeoutError
    @process.stop
  end

  @logcollectors.values.each do |collector_thread|
    Thread.kill(collector_thread)
  end

  @stdout = @logcollectors[:stdout][:log]
  @stderr = @logcollectors[:stderr][:log]

  self
end

#run!(stdin = nil) ⇒ Object 



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# File 'lib/prcs.rb', line 25

def run!(stdin = nil)
  stdout_pipe, stdout_wr = IO.pipe
  stderr_pipe, stderr_wr = IO.pipe

  ChildProcess.posix_spawn = true
  @process = ChildProcess.build(*@command)
  @process.duplex = true if stdin
  @process.io.stdout = stdout_wr
  @process.io.stderr = stderr_wr

  @process.start

  stdout_wr.close
  stderr_wr.close

  if stdin
    @process.io.stdin.write(stdin)
    @process.io.stdin.close
  end

  @logcollectors[:stdout] = Thread.new(stdout_pipe) do |pipe|
    Thread.current[:running] = true
    Thread.current[:log] = ""

    while Thread.current[:running]
      begin
        output = pipe.readline_nonblock
        @external_queues[:stdout] << output
        Thread.current[:log] << output
        sleep(0.1)
      rescue IO::EAGAINWaitReadable, EOFError
      end
    end
  end

  @logcollectors[:stderr] = Thread.new(stderr_pipe) do |pipe|
    Thread.current[:running] = true
    Thread.current[:log] = ""

    while Thread.current[:running]
      begin
        output = pipe.readline_nonblock
        @external_queues[:stderr] << output
        Thread.current[:log] << output
        sleep(0.1)
      rescue IO::EAGAINWaitReadable, EOFError
      end
    end
  end

  self
end

#run_and_wait!(stdin = nil) ⇒ Object 



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# File 'lib/prcs.rb', line 78

def run_and_wait!(stdin = nil)
  self.run!(stdin)
  @process.wait

  self
end

#stderr ⇒ Object 



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# File 'lib/prcs.rb', line 140

def stderr
  if alive?
    raise "Process still alive, use queue-method instead"
  else
    @stderr
  end
end

#stderr_queue ⇒ Object 



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# File 'lib/prcs.rb', line 117

def stderr_queue
  "".tap { |it|
    begin
      while(true)
        it << @external_queues[:stderr].pop(true)
      end
    rescue ThreadError
    end
  }
end

#stdin ⇒ Object 



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# File 'lib/prcs.rb', line 128

def stdin
  @process.io.stdin
end

#stdout ⇒ Object 



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# File 'lib/prcs.rb', line 132

def stdout
  if alive?
    raise "Process still alive, use queue-method instead"
  else
    @stdout
  end
end

#stdout_queue ⇒ Object 



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# File 'lib/prcs.rb', line 106

def stdout_queue
  "".tap { |it|
    begin
      while(true)
        it << @external_queues[:stdout].pop(true)
      end
    rescue ThreadError
    end
  }
end