Class: RailsDevMCP::ProcessManager

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rails_root:, port: 3000) ⇒ ProcessManager

Returns a new instance of ProcessManager.



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# File 'lib/rails_dev_mcp/process_manager.rb', line 10

def initialize(rails_root:, port: 3000)
  @rails_root = rails_root
  @port = port
  @log_file = File.join(rails_root, 'tmp', 'rails-dev-mcp.log')
  @pid_file = File.join(rails_root, 'tmp', 'pids', 'rails-dev-mcp.pid')
  @pid = nil
  @stdin = nil
  @stdout = nil
  @stderr = nil
  @wait_thread = nil
  
  ensure_directories
end

Instance Attribute Details

#log_file ⇒ Object (readonly)

Returns the value of attribute log_file.



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# File 'lib/rails_dev_mcp/process_manager.rb', line 8

def log_file
  @log_file
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/rails_dev_mcp/process_manager.rb', line 8

def pid
  @pid
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/rails_dev_mcp/process_manager.rb', line 8

def port
  @port
end

Instance Method Details

#logs(lines: 50) ⇒ Object 



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# File 'lib/rails_dev_mcp/process_manager.rb', line 83

def logs(lines: 50)
  return { success: false, error: 'Log file not found' } unless File.exist?(@log_file)

  begin
    log_content = `tail -n #{lines} #{@log_file}`
    
    # Extract notable events (errors, warnings, requests)
    notable_lines = log_content.lines.select do |line|
      line =~ /ERROR|WARN|FATAL|Started|Completed|ActionController::RoutingError|ActiveRecord::|NoMethodError|NameError|SyntaxError/
    end

    {
      success: true,
      full_logs: log_content,
      notable_events: notable_lines.join,
      log_file: @log_file
    }
  rescue StandardError => e
    { success: false, error: e.message }
  end
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rails_dev_mcp/process_manager.rb', line 123

def running?
  return false unless @pid || read_pid_file

  begin
    Process.kill(0, @pid || read_pid_file)
    true
  rescue Errno::ESRCH
    false
  end
end

#start ⇒ Object 



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# File 'lib/rails_dev_mcp/process_manager.rb', line 24

def start
  return { success: false, error: 'Server already running' } if running?

  # Start Rails server with output captured
  cmd = "rails server -p #{@port}"
  
  @stdin, @stdout, @stderr, @wait_thread = Open3.popen3(
    cmd,
    chdir: @rails_root,
    err: [:child, :out] # Combine stderr into stdout
  )
  
  @pid = @wait_thread.pid
  write_pid_file(@pid)

  # Start log capture thread
  Thread.new do
    File.open(@log_file, 'a') do |log|
      @stdout.each_line do |line|
        log.puts(line)
        log.flush
      end
    end
  end

  # Wait a moment to check if it started successfully
  sleep 2
  
  if running?
    { success: true, message: "Rails server started on port #{@port}", pid: @pid }
  else
    { success: false, error: 'Failed to start Rails server' }
  end
rescue StandardError => e
  { success: false, error: e.message }
end

#status ⇒ Object 



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# File 'lib/rails_dev_mcp/process_manager.rb', line 105

def status
  if running?
    {
      running: true,
      pid: @pid,
      port: @port,
      url: "http://localhost:#{@port}",
      log_file: @log_file
    }
  else
    {
      running: false,
      port: @port,
      log_file: @log_file
    }
  end
end

#stop ⇒ Object 



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# File 'lib/rails_dev_mcp/process_manager.rb', line 61

def stop
  return { success: false, error: 'Server not running' } unless running?

  begin
    Process.kill('TERM', @pid)
    @wait_thread&.join(5) # Wait up to 5 seconds for graceful shutdown
    
    if running?
      Process.kill('KILL', @pid) # Force kill if still running
    end
    
    cleanup
    { success: true, message: 'Rails server stopped' }
  rescue Errno::ESRCH
    # Process already dead
    cleanup
    { success: true, message: 'Rails server was already stopped' }
  rescue StandardError => e
    { success: false, error: e.message }
  end
end