def disconnect(self):
"""Closes the serial connection.
Raises:
error.BadSerialConnection if unable to close the connection.
"""
# Fortunately, close() doesn't throw an exception if already closed.
self.logger.debug('SerialData.disconnect called for {}', self.name)
try:
self.ser.close()
except Exception as err:
raise error.BadSerialConnection(
msg="SerialData.disconnect failed for {}; underlying error: {}"
.format(self.name, err))
if self.is_connected:
raise error.BadSerialConnection(
msg="SerialData.disconnect failed for {}".format(self.name))
def connect(self):
"""If disconnected, then connect to the serial port.
Raises:
error.BadSerialConnection if unable to open the connection.
"""
if self.is_connected:
self.logger.debug('Connection already open to {}', self.name)
return
self.logger.debug('SerialData.connect called for {}', self.name)
try:
# Note: we must not call open when it is already open, else an exception is thrown of
# the same type thrown when open fails to actually open the device.
self.ser.open()
if not self.is_connected:
raise error.BadSerialConnection(
msg="Serial connection {} is not open".format(self.name))
except serial.serialutil.SerialException as err:
raise error.BadSerialConnection(msg=err)
self.logger.debug('Serial connection established to {}', self.name)
def _connect(self):
""" Sets up serial connection """
self.logger.debug('Making serial connection for mount at {}'.format(
self._port))
try:
self.serial.connect()
except Exception:
raise error.BadSerialConnection(
'Cannot create serial connect for mount at port {}'.format(
self._port))
self.logger.debug('Mount connected via serial')
def verify_connected(self):
"""Throw an exception if not connected."""
if not self.is_connected:
raise error.BadSerialConnection(
msg='Not connected to dome at port {}'.format(self._port))