Class: Deployed::RunController

Inherits:
ApplicationController show all
Includes:
ActionController::Live
Defined in:
app/controllers/deployed/run_controller.rb

Overview

Provides a centralized way to run all ‘kamal [command]` executions and streams to the browser

Defined Under Namespace

Classes: ConcurrentProcessRunning

Instance Method Summary collapse

Instance Method Details

#cancel ⇒ Object

Endpoint to cancel currently running process



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# File 'app/controllers/deployed/run_controller.rb', line 87

def cancel
  if process_running?
    # If a process is running, get the PID and attempt to kill it
    begin
      Process.kill('TERM', stored_pid)
      sse.write(
        "<div class='text-yellow-400'>Cancelled the process with PID: #{stored_pid}</div>",
        event: 'message'
      )
      release_process
    rescue Errno::ESRCH
      sse.write(
        "<div class='text-red-500'>Process with PID #{stored_pid} is not running.</div>",
        event: 'message'
      )
    end
  else
    sse.write(
      "<div class='text-slate-400'>No process is currently running, nothing to cancel.</div>",
      event: 'message'
    )
  end
rescue ActionController::Live::ClientDisconnected
  logger.info 'Client Disconnected'
rescue IOError
  logger.info 'IOError'
ensure
  sse.write(
    '[Deployed Rails] End transmission',
    event: 'message'
  )
  sse.close
  response.stream.close
  release_process
end

#execute ⇒ Object

Endpoint to execute the kamal command



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# File 'app/controllers/deployed/run_controller.rb', line 13

def execute
  if process_running?
    raise(ConcurrentProcessRunning)
  elsif stored_pid
    release_process
  end

  sse.write(
    "<div class='text-slate-400'>> <span class='text-slate-300 font-semibold'>kamal #{command}</span></div>",
    event: 'message'
  )

  read_io, write_io = IO.pipe

  # Fork a child process
  Deployed::CurrentExecution.child_pid = fork do
    # Redirect the standard output to the write end of the pipe
    $stdout.reopen(write_io)

    # Execute the command
    exec("kamal #{command}; echo \"[Deployed Rails] End transmission\"")
  end

  lock_process

  sse.write(
    "<div class='text-slate-400' data-child-pid=\"#{Deployed::CurrentExecution.child_pid}\"></div>",
    event: 'message'
  )

  write_io.close

  # Use a separate thread to read and stream the output
  output_thread = Thread.new do
    read_io.each_line do |line|
      output = line.strip
      output = output.gsub('49.13.91.176', '[redacted]')
      text_color_class = 'text-green-400'

      # Hackish way of dealing with error messages at the moment
      if output.include?('[31m')
        text_color_class = 'text-red-500'
        output.gsub!('[31m', '')
        output.gsub!('[0m', '')
      end

      sse.write("<div class='#{text_color_class}'>#{output}</div>", event: 'message')
    end

    # Ensure the response stream and the thread are closed properly
    sse.close
    response.stream.close
  end

  # Ensure that the thread is joined when the execution is complete
  Process.wait
  output_thread.join
rescue ConcurrentProcessRunning
  sse.write(
    "<div class='text-red-500'>Existing process running with PID: #{stored_pid}</div>",
    event: 'message'
  )
  logger.info 'Existing process running'
rescue ActionController::Live::ClientDisconnected
  logger.info 'Client Disconnected'
rescue IOError
  logger.info 'IOError'
ensure
  sse.close
  response.stream.close
  release_process
end