Class: Toys::Utils::Exec::Controller

Inherits:
Object
  • Object
show all
Defined in:
lib/toys/utils/exec.rb

Overview

An object that controls a subprocess. This object is returned from an execution running in the background, or is yielded to a control block for an execution running in the foreground. You may use this object to interact with the subcommand's streams, send signals to the process, and get its result.

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#err ⇒ IO? (readonly)

The subcommand's standard error stream (which can be read from).

Returns:

  • (IO) —

    if the command was configured with err: :controller

  • (nil) —

    if the command was not configured with err: :controller



546
547
548
 
# File 'lib/toys/utils/exec.rb', line 546

def err
  @err
end

#exception ⇒ Exception? (readonly)

The exception raised when the process failed to start.

Exactly one of #exception and #pid will be non-nil.

Returns:

  • (Exception) —

    if the process failed to start.

  • (nil) —

    if the process start was successful.



566
567
568
 
# File 'lib/toys/utils/exec.rb', line 566

def exception
  @exception
end

#in ⇒ IO? (readonly)

The subcommand's standard input stream (which can be written to).

Returns:

  • (IO) —

    if the command was configured with in: :controller

  • (nil) —

    if the command was not configured with in: :controller



528
529
530
 
# File 'lib/toys/utils/exec.rb', line 528

def in
  @in
end

#name ⇒ Object (readonly)

The subcommand's name.

Returns:

  • (Object) 


519
520
521
 
# File 'lib/toys/utils/exec.rb', line 519

def name
  @name
end

#out ⇒ IO? (readonly)

The subcommand's standard output stream (which can be read from).

Returns:

  • (IO) —

    if the command was configured with out: :controller

  • (nil) —

    if the command was not configured with out: :controller



537
538
539
 
# File 'lib/toys/utils/exec.rb', line 537

def out
  @out
end

#pid ⇒ Integer? (readonly)

The process ID.

Exactly one of #exception and #pid will be non-nil.

Returns:

  • (Integer) —

    if the process start was successful

  • (nil) —

    if the process could not be started.



556
557
558
 
# File 'lib/toys/utils/exec.rb', line 556

def pid
  @pid
end

Instance Method Details

#capture(which) ⇒ self

Captures the remaining data in the given stream. After calling this, do not read directly from the stream.

Parameters:

  • which (:out, :err) —

    Which stream to capture

Returns:

  • (self) 


575
576
577
578
579
580
581
582
583
584
585
586
587
588
 
# File 'lib/toys/utils/exec.rb', line 575

def capture(which)
  stream = stream_for(which)
  @join_threads << ::Thread.new do
    begin
      data = stream.read
      @mutex.synchronize do
        @captures[which] = data
      end
    ensure
      stream.close
    end
  end
  self
end

#capture_err ⇒ self

Captures the remaining data in the standard error stream. After calling this, do not read directly from the stream.

Returns:

  • (self) 


606
607
608
 
# File 'lib/toys/utils/exec.rb', line 606

def capture_err
  capture(:err)
end

#capture_out ⇒ self

Captures the remaining data in the standard output stream. After calling this, do not read directly from the stream.

Returns:

  • (self) 


596
597
598
 
# File 'lib/toys/utils/exec.rb', line 596

def capture_out
  capture(:out)
end

#executing? ⇒ Boolean

Determine whether the subcommand is still executing

Returns:

  • (Boolean) 


722
723
724
 
# File 'lib/toys/utils/exec.rb', line 722

def executing?
  @wait_thread&.status ? true : false
end

#kill(sig) ⇒ self Also known as: signal

Send the given signal to the process. The signal may be specified by name or number.

Parameters:

  • sig (Integer, String) —

    The signal to send.

Returns:

  • (self) 


711
712
713
714
 
# File 'lib/toys/utils/exec.rb', line 711

def kill(sig)
  ::Process.kill(sig, pid) if pid
  self
end

#redirect(which, io, *io_args) ⇒ self

Redirects the remainder of the given stream.

You may specify the stream as an IO or IO-like object, or as a file specified by its path. If specifying a file, you may optionally provide the mode and permissions for the call to File#open. You can also specify the value :null to indicate the null file.

After calling this, do not interact directly with the stream.

Parameters:

  • which (:in, :out, :err) —

    Which stream to redirect

  • io (IO, StringIO, String, :null) —

    Where to redirect the stream

  • io_args (Object...) —

    The mode and permissions for opening the file, if redirecting to/from a file.

Returns:

  • (self) 


626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
 
# File 'lib/toys/utils/exec.rb', line 626

def redirect(which, io, *io_args)
  io = ::File::NULL if io == :null
  if io.is_a?(::String)
    io_args = which == :in ? ["r"] : ["w"] if io_args.empty?
    io = ::File.open(io, *io_args)
  end
  stream = stream_for(which, allow_in: true)
  @join_threads << ::Thread.new do
    begin
      if which == :in
        ::IO.copy_stream(io, stream)
      else
        ::IO.copy_stream(stream, io)
      end
    ensure
      stream.close
      io.close
    end
  end
  self
end

#redirect_err(io, *io_args) ⇒ self

Redirects the remainder of the standard error stream.

You may specify the stream as an IO or IO-like object, or as a file specified by its path. If specifying a file, you may optionally provide the mode and permissions for the call to File#open.

After calling this, do not interact directly with the stream.

Parameters:

  • io (IO, StringIO, String) —

    Where to redirect the stream

  • io_args (Object...) —

    The mode and permissions for opening the file, if redirecting to a file.

Returns:

  • (self) 


700
701
702
 
# File 'lib/toys/utils/exec.rb', line 700

def redirect_err(io, *io_args)
  redirect(:err, io, *io_args)
end

#redirect_in(io, *io_args) ⇒ self

Redirects the remainder of the standard input stream.

You may specify the stream as an IO or IO-like object, or as a file specified by its path. If specifying a file, you may optionally provide the mode and permissions for the call to File#open. You can also specify the value :null to indicate the null file.

After calling this, do not interact directly with the stream.

Parameters:

  • io (IO, StringIO, String, :null) —

    Where to redirect the stream

  • io_args (Object...) —

    The mode and permissions for opening the file, if redirecting from a file.

Returns:

  • (self) 


663
664
665
 
# File 'lib/toys/utils/exec.rb', line 663

def redirect_in(io, *io_args)
  redirect(:in, io, *io_args)
end

#redirect_out(io, *io_args) ⇒ self

Redirects the remainder of the standard output stream.

You may specify the stream as an IO or IO-like object, or as a file specified by its path. If specifying a file, you may optionally provide the mode and permissions for the call to File#open. You can also specify the value :null to indicate the null file.

After calling this, do not interact directly with the stream.

Parameters:

  • io (IO, StringIO, String, :null) —

    Where to redirect the stream

  • io_args (Object...) —

    The mode and permissions for opening the file, if redirecting to a file.

Returns:

  • (self) 


682
683
684
 
# File 'lib/toys/utils/exec.rb', line 682

def redirect_out(io, *io_args)
  redirect(:out, io, *io_args)
end

#result(timeout: nil) ⇒ Toys::Utils::Exec::Result?

Wait for the subcommand to complete, and return a result object.

Closes the control streams if present. The stdin stream is always closed, even if the call times out. The stdout and stderr streams are closed only after the command terminates.

Parameters:

  • timeout (Numeric, nil) (defaults to: nil) —

    The timeout in seconds, or nil to wait indefinitely.

Returns:



738
739
740
741
742
743
744
745
746
747
 
# File 'lib/toys/utils/exec.rb', line 738

def result(timeout: nil)
  close_streams(:in)
  return nil if @wait_thread && !@wait_thread.join(timeout)
  @result ||= begin
    close_streams(:out)
    @join_threads.each(&:join)
    Result.new(name, @captures[:out], @captures[:err], @wait_thread&.value, @exception)
          .tap { |result| @result_callback&.call(result) }
  end
end