Class: Encom::Transport::Stdio

Inherits:
Object
  • Object
show all
Defined in:
lib/encom/transport/stdio.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command:, args: []) ⇒ Stdio

Returns a new instance of Stdio.



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# File 'lib/encom/transport/stdio.rb', line 13

def initialize(
  command:,
  args: []
)
  super()
  @command = command
  @args = args
  @process = nil
  @read_buffer = +''  # Use mutable string
  @callbacks = {
    error: [],
    close: [],
    data: []
  }
  @mutex = Mutex.new
  @json_buffer = '' # Buffer for accumulating JSON messages
end

Instance Attribute Details

#process_pid ⇒ Object (readonly)

Returns the value of attribute process_pid.



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# File 'lib/encom/transport/stdio.rb', line 11

def process_pid
  @process_pid
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/encom/transport/stdio.rb', line 90

def close
  return unless @process

  begin
    @stdin.close
  rescue StandardError
    nil
  end

  begin
    Timeout.timeout(2) do
      Process.wait(@process.pid)
    rescue StandardError
      nil
    end
  rescue Timeout::Error
    begin
      Process.kill('TERM', @process.pid)
    rescue StandardError
      nil
    end

    begin
      Timeout.timeout(1) do
        Process.wait(@process.pid)
      rescue StandardError
        nil
      end
    rescue Timeout::Error
      begin
        Process.kill('KILL', @process.pid)
      rescue StandardError
        nil
      end
    end
  end

  # Clean up resources
  begin
    @stdout.close
  rescue StandardError
    nil
  end
  begin
    @stderr.close
  rescue StandardError
    nil
  end

  trigger_close

  @process = nil
end

#on_close(&block) ⇒ Object 



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# File 'lib/encom/transport/stdio.rb', line 37

def on_close(&block)
  @callbacks[:close] << block
  self
end

#on_data(&block) ⇒ Object 



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# File 'lib/encom/transport/stdio.rb', line 42

def on_data(&block)
  @callbacks[:data] << block
  self
end

#on_error(&block) ⇒ Object

Register event handlers



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# File 'lib/encom/transport/stdio.rb', line 32

def on_error(&block)
  @callbacks[:error] << block
  self
end

#send(data) ⇒ Object 



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# File 'lib/encom/transport/stdio.rb', line 71

def send(data)
  return false unless @process && @stdin

  data = "#{data}\n" unless data.end_with?("\n")

  begin
    @stdin.write(data)
    @stdin.flush
    true
  rescue IOError, Errno::EPIPE => e
    trigger_error(e)
    false
  end
end

#send_line(data) ⇒ Object 



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# File 'lib/encom/transport/stdio.rb', line 86

def send_line(data)
  send("#{data}\n")
end

#start ⇒ Object 



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# File 'lib/encom/transport/stdio.rb', line 47

def start
  raise 'StdioClientTransport already started!' if @process

  env = ENV.to_h

  command = @command
  args = @args

  @stdin, @stdout, @stderr, @process = Open3.popen3(
    env,
    command,
    *args
    # chdir: @server_params[:cwd]
  )

  @process_pid = @process.pid

  start_stdout_thread
  start_stderr_thread
  start_process_monitor_thread

  self
end