Class: Yobi::IOHandle

Inherits:
Object
  • Object
show all
Defined in:
lib/yobi/io_handle.rb,
sig/yobi.rbs

Overview

A live Restic process streaming raw bytes to its own stdout, returned by Restic#run_dump when no block is given. Satisfies Rack's Body contract (#each, #close).

Unlike the block form, nothing closes this automatically. Call #close yourself once done reading, in an ensure, so it still runs if reading raises:

Examples:

handle = repo.dump(snapshot_id: "latest", file: "/etc/hosts")
begin
  IO.copy_stream(handle.io, "/tmp/hosts")
ensure
  handle.close
end

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(io, pid:, output_file:, argv:) ⇒ IOHandle

Returns a new instance of IOHandle.

Parameters:

  • io (IO)
  • pid (Integer)
  • output_file (File)
  • argv (Array<String>)
  • pid: (Integer)
  • output_file: (File)
  • argv: (Array[String]) 


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# File 'lib/yobi/io_handle.rb', line 29

def initialize(io, pid:, output_file:, argv:)
  @io = io
  @pid = pid
  @output_file = output_file
  @argv = argv
  @closed = false
end

Instance Attribute Details

#io ⇒ IO (readonly)

Returns the readable end of the pipe Restic's stdout is wired to.

Returns:

  • (IO) —

    the readable end of the pipe Restic's stdout is wired to



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# File 'lib/yobi/io_handle.rb', line 21

def io
  @io
end

#pid ⇒ Integer (readonly)

Returns the Restic process's pid.

Returns:

  • (Integer) —

    the Restic process's pid



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# File 'lib/yobi/io_handle.rb', line 23

def pid
  @pid
end

Instance Method Details

#close ⇒ void

This method returns an undefined value.

Reaps the Restic process and raises based on its exit code. Safe to call more than once.



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# File 'lib/yobi/io_handle.rb', line 46

def close
  return if @closed

  @closed = true
  @io.close unless @io.closed?
  _, status = Process.wait2(@pid)
  Restic.dispatch(exit_code: status.exitstatus, output: Yobi::ResticOutput.new(@output_file), argv: @argv)
end

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/yobi/io_handle.rb', line 38

def closed?
  @closed
end

#each {|chunk| ... } ⇒ void

This method returns an undefined value.

Yields binary-safe chunks of #io until EOF, then calls #close.

Yields:

Yield Parameters:

  • chunk (String)

Yield Returns:

  • (void) 


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# File 'lib/yobi/io_handle.rb', line 59

def each
  loop do
    yield @io.readpartial(64 * 1024)
  rescue EOFError
    break
  end
  close
end