Class: SSHake::Session

Inherits:
BaseSession show all
Defined in:
lib/sshake/session.rb

Instance Attribute Summary collapse

Attributes inherited from BaseSession

#id, #klogger, #raise_on_error

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host, username = nil, **options) ⇒ Sshake::Session

Create a new SSH session



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# File 'lib/sshake/session.rb', line 26

def initialize(host, username = nil, **options)
  super
  @host = host
  @username = username
  @session_options = options
  @session_options.delete(:klogger)
end

Instance Attribute Details

#host ⇒ String (readonly)

Return the host to connect to

Returns:

  • (String) 


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# File 'lib/sshake/session.rb', line 21

def host
  @host
end

#session ⇒ Net::SSH::Session (readonly)

The underlying net/ssh session

Returns:

  • (Net::SSH::Session) 


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# File 'lib/sshake/session.rb', line 16

def session
  @session
end

Class Method Details

.create(*args) ⇒ Object 



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# File 'lib/sshake/session.rb', line 194

def create(*args)
  session = new(*args)

  if recorder = Thread.current[:sshake_recorder]
    return RecordedSession.new(recorder, session)
  end

  session
end

Instance Method Details

#connect ⇒ void

This method returns an undefined value.

Connect to the SSH server



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# File 'lib/sshake/session.rb', line 51

def connect
  klogger.debug 'Connecting', id: @id, host: @host, user: @user, port: @session_options[:port] || 22
  @session = Net::SSH.start(@host, user, **@session_options)
  true
end

#connected? ⇒ Boolean

Is there an established SSH connection

Returns:

  • (Boolean) 


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# File 'lib/sshake/session.rb', line 60

def connected?
  !@session.nil?
end

#disconnect ⇒ void

This method returns an undefined value.

Disconnect the underlying SSH connection



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# File 'lib/sshake/session.rb', line 67

def disconnect
  return false if @session.nil?

  begin
    klogger.debug 'Closing connection', id: @id, host: @host
    @session.close
    klogger.debug 'Connection closed', id: @id, host: @host
  rescue StandardError => e
    logger.exception(e, 'Connection not closed')
    nil
  end
  @session = nil
  true
end

#execute(commands, options = nil, &block) ⇒ Object

rubocop:disable Metrics/AbcSize



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# File 'lib/sshake/session.rb', line 91

def execute(commands, options = nil, &block)
  options = create_options(options, block)
  command_to_execute = prepare_commands(commands, options)

  # Execute the command
  response = Response.new
  response.command = command_to_execute
  connect unless connected?

  klogger.group(id: @id, host: @host) do
    klogger.info 'Executing command', command: command_to_execute, timeout: options.timeout

    begin
      channel = nil

      Timeout.timeout(options.timeout) do
        channel = @session.open_channel do |ch|
          response.start_time = Time.now

          channel.exec(command_to_execute) do |_, success|
            raise "Command \"#{command_to_execute}\" was unable to execute" unless success

            ch.send_data(options.stdin) if options.stdin

            if options.file_to_stream.nil? && options.sudo_password.nil?
              klogger.debug 'Sending EOF to channel'
              ch.eof!
            end

            ch.on_data do |_, data|
              response.stdout += data
              options.stdout&.call(data)
              klogger.debug "[stdout] #{data.gsub(/\r/, '').strip}"
            end

            ch.on_extended_data do |_, _, data|
              response.stderr += data.delete("\r")
              options.stderr&.call(data)
              klogger.debug "[stderr] #{data.gsub(/\r/, '').strip}"
              if options.sudo_password && data =~ /^\[sshake-sudo-password\]:\s\z/
                klogger.debug 'Sending sudo password', length: options.sudo_password.length
                ch.send_data "#{options.sudo_password}\n"

                if options.file_to_stream.nil?
                  klogger.debug 'Sending EOF after password'
                  ch.eof!
                end
              end
            end

            ch.on_request('exit-status') do |_, data|
              response.exit_code = data.read_long&.to_i
              klogger.info 'Exited', exit_code: response.exit_code
            end

            ch.on_request('exit-signal') do |_, data|
              response.exit_signal = data.read_long
            end

            if options.file_to_stream
              ch.on_process do |_, data|
                next if ch.eof?

                if ch.output.length < 128 * 1024
                  if data = options.file_to_stream.read(1024 * 1024)
                    ch.send_data(data)
                    response.bytes_streamed += data.bytesize
                  else
                    ch.eof!
                  end
                end
              end
            end
          end
        end
        channel.wait
      end
    rescue Timeout::Error
      klogger.debug 'Command timed out'
      kill!
      response.timeout!
    ensure
      response.finish_time = Time.now
    end
  end

  handle_response(response, options)
end

#kill! ⇒ Object

Kill the underlying connection



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# File 'lib/sshake/session.rb', line 83

def kill!
  klogger.debug 'Attemping to shutdown', id: @id, host: @host
  @session.shutdown!
  klogger.debug 'Shutdown success', id: @id, host: @host
  @session = nil
end

#port ⇒ Integer

Return the port that will be connected to

Returns:

  • (Integer) 


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# File 'lib/sshake/session.rb', line 44

def port
  @session_options[:port] || 22
end

#user ⇒ String

Return the username for the connection

Returns:

  • (String) 


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# File 'lib/sshake/session.rb', line 37

def user
  @user || ENV.fetch('USER', nil)
end

#write_data(path, data, options = nil, &block) ⇒ Object

rubocop:enable Metrics/AbcSize



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# File 'lib/sshake/session.rb', line 181

def write_data(path, data, options = nil, &block)
  connect unless connected?
  tmp_path = "/tmp/sshake-tmp-file-#{SecureRandom.hex(32)}"
  @session.sftp.file.open(tmp_path, 'w') do |f|
    d = data.dup.force_encoding('BINARY')
    f.write(d.slice!(0, 1024)) until d.empty?
  end
  response = execute("mv #{tmp_path} #{path}", options, &block)
  response.success?
end