class Protocol(CommandResponseInstrumentProtocol):
"""
Instrument protocol class
Subclasses CommandResponseInstrumentProtocol
"""
__metaclass__ = META_LOGGER
def __init__(self, prompts, newline, driver_event):
"""
Protocol constructor.
@param prompts A BaseEnum class containing instrument prompts.
@param newline The newline.
@param driver_event Driver process event callback.
"""
# Construct protocol superclass.
CommandResponseInstrumentProtocol.__init__(self, prompts, newline, driver_event)
# Build protocol state machine.
self._protocol_fsm = ThreadSafeFSM(ProtocolState, ProtocolEvent,
ProtocolEvent.ENTER, ProtocolEvent.EXIT)
# Add event handlers for protocol state machine.
handlers = {
ProtocolState.UNKNOWN: [
(ProtocolEvent.ENTER, self._handler_generic_enter),
(ProtocolEvent.EXIT, self._handler_generic_exit),
(ProtocolEvent.DISCOVER, self._handler_unknown_discover),
],
ProtocolState.COMMAND: [
(ProtocolEvent.ENTER, self._handler_generic_enter),
(ProtocolEvent.EXIT, self._handler_generic_exit),
(ProtocolEvent.START_DIRECT, self._handler_command_start_direct),
(ProtocolEvent.GET, self._handler_command_get),
(ProtocolEvent.SET, self._handler_command_set),
(ProtocolEvent.START_SCAN, self._handler_command_start_scan),
],
ProtocolState.DIRECT_ACCESS: [
(ProtocolEvent.ENTER, self._handler_direct_access_enter),
(ProtocolEvent.EXIT, self._handler_generic_exit),
(ProtocolEvent.STOP_DIRECT, self._handler_direct_access_stop_direct),
(ProtocolEvent.EXECUTE_DIRECT, self._handler_direct_access_execute_direct),
],
ProtocolState.SCAN: [
(ProtocolEvent.ENTER, self._handler_scan_enter),
(ProtocolEvent.EXIT, self._handler_scan_exit),
(ProtocolEvent.STOP_SCAN, self._handler_scan_stop_scan),
(ProtocolEvent.TAKE_SCAN, self._handler_scan_take_scan),
(ProtocolEvent.TIMEOUT, self._handler_scan_timeout),
(ProtocolEvent.ERROR, self._handler_scan_error),
],
ProtocolState.ERROR: [
(ProtocolEvent.ENTER, self._handler_generic_enter),
(ProtocolEvent.EXIT, self._handler_generic_exit),
(ProtocolEvent.CLEAR, self._handler_error_clear),
(ProtocolEvent.GET, self._handler_command_get),
]
}
for state in handlers:
for event, handler in handlers[state]:
self._protocol_fsm.add_handler(state, event, handler)
# Construct the parameter dictionary containing device parameters,
# current parameter values, and set formatting functions.
self._build_param_dict()
self._build_command_dict()
self._build_driver_dict()
# Add build handlers for device commands.
for command in InstrumentCommand.list():
self._add_build_handler(command, self._generic_build_handler)
# Add response handlers for device commands.
for command in InstrumentCommand.list():
self._add_response_handler(command, functools.partial(self._generic_response_handler, command=command))
# State state machine in UNKNOWN state.
self._protocol_fsm.start(ProtocolState.UNKNOWN)
# commands sent sent to device to be filtered in responses for telnet DA
self._sent_cmds = []
self._chunker = StringChunker(Protocol.sieve_function)
self.initialize_scheduler()
# all calls to do_cmd_resp should expect RESPONSE_REGEX and use TIMEOUT. Freeze these arguments...
self._do_cmd_resp = functools.partial(self._do_cmd_resp, response_regex=RESPONSE_REGEX, timeout=TIMEOUT)
# these variables are used to track scan time and completion status
# for development and performance data
self.scan_start_time = 0
self.in_scan = False
@staticmethod
def sieve_function(raw_data):
"""
This is a placeholder. The sieve function for the RGA is built dynamically when a scan is started.
This function must return a list.
see self._build_sieve_function()
"""
return []
def _build_param_dict(self):
"""
Populate the parameter dictionary with parameters.
For each parameter key, add match string, match lambda function,
and value formatting function for set commands.
"""
name = 'display_name'
desc = 'description'
units = 'units'
val_desc = 'value_description'
parameters = {
Parameter.ID: {
name: 'RGA ID String',
desc: '',
},
Parameter.EE: {
name: 'Electron Energy',
desc: 'The desired electron ionization energy: (25 - 105)',
units: DriverUnits.ELECTRONVOLT,
val_desc: 'The desired electron ionization energy in units of eV'
},
Parameter.IE: {
name: 'Ion Energy',
desc: 'The ion energy: (0:8eV | 1:12eV)',
val_desc: 'Ion energy level: 0 for Low and 1 for High',
},
Parameter.VF: {
name: 'Focus Plate Voltage',
desc: 'The focus plate voltage in the ionizer: (0 - 150)',
val_desc: 'The parameter represents the magnitude of the biasing voltage (negative) in units of volts.',
units: DriverUnits.VOLT,
},
Parameter.NF: {
name: 'Noise Floor',
desc: 'Rate and detection limit for ion current measurements: (0 - 7)',
val_desc: 'The parameter represents the noise-floor level desired. Lower parameter values ' +
'correspond to lower baseline noise, better detection limits and increased measurement ' +
'times. Please refer to the Electrometer section of the RGA Electronics Control Unit ' +
'chapter to obtain detailed information about detection limits and bandwidth values' +
'as a function of NF settings.',
},
Parameter.SA: {
name: 'Steps per AMU',
desc: 'Number of steps executed per amu of analog scan: (10 - 25)',
val_desc: 'The parameter specifies the number of steps-per-amu.',
units: DriverUnits.COUNTS,
},
Parameter.MI: {
name: 'Initial Mass',
desc: 'The initial scan mass: (1 - 200)',
units: DriverUnits.AMU,
},
Parameter.MF: {
name: 'Final Mass',
desc: 'The final scan mass: (1 - 200)',
units: DriverUnits.AMU,
},
Parameter.FL: {
name: 'Electron Emission Current',
desc: 'Electron emission current level in the ionizer: (0 - 3.5)',
val_desc: 'The parameter represents the desired electron emission current.',
units: Prefixes.MILLI + Units.AMPERE
},
Parameter.FL_ACTUAL: {
name: 'Actual Electron Emission Current',
desc: 'The actual electron emission current level in the ionizer.',
val_desc: 'The parameter represents the actual electron emission current.',
units: Prefixes.MILLI + Units.AMPERE
},
Parameter.AP: {
name: 'Analog Scan Points',
desc: 'The total number of ion currents that will be measured and transmitted ' +
'during an analog scan under the current scan conditions.',
val_desc: 'Total number of ion currents to be transmitted. Does not include the four extra' +
'bytes for total pressure included when performing an analog scan.',
units: DriverUnits.COUNTS
},
Parameter.HV: {
name: 'High Voltage CDEM',
desc: 'Electron multiplier high voltage bias setting: (0:disables CDEM, 10 - 2490)',
val_desc: '0 disables the CDEM, values from 10-2490 enable the CDEM and specify the CDEM bias voltage',
units: Units.VOLT
},
Parameter.ER: {
name: 'Status Byte',
desc: 'Bit-mapped value representing any errors detected by the RGA.',
val_desc: '0 indicates no errors detected. See the RGA manual if this value is non-zero.',
},
Parameter.ERROR_REASON: {
name: 'RGA Error Reason',
desc: 'Reason for RGA error state.'
}
}
constraints = ParameterConstraints.dict()
read_only = [Parameter.ID, Parameter.AP, Parameter.ER, Parameter.FL_ACTUAL, Parameter.ERROR_REASON]
floats = [Parameter.FL, Parameter.FL_ACTUAL]
strings = [Parameter.ID, Parameter.ERROR_REASON]
for param in parameters:
visibility = ParameterDictVisibility.READ_WRITE
value_type = ParameterDictType.INT
formatter = int
startup = True
if param in read_only:
visibility = ParameterDictVisibility.READ_ONLY
startup = False
if param in floats:
value_type = ParameterDictType.FLOAT
formatter = float
elif param in strings:
value_type = ParameterDictType.STRING
formatter = str
if param in constraints:
_type, minimum, maximum = constraints[param]
parameters[param][val_desc] = '%s %s value from %d - %d' % (parameters[param].get(val_desc, ''),
_type, minimum, maximum)
self._param_dict.add(param, '', None, formatter, type=value_type,
visibility=visibility, startup_param=startup, **parameters[param])
def _build_command_dict(self):
"""
Populate the command dictionary with commands.
"""
self._cmd_dict.add(Capability.START_SCAN, display_name="Start Scan")
self._cmd_dict.add(Capability.STOP_SCAN, display_name="Stop Scan")
self._cmd_dict.add(Capability.CLEAR, display_name="Clear Error State")
self._cmd_dict.add(Capability.DISCOVER, display_name='Discover')
def _build_driver_dict(self):
"""
Populate the driver dictionary with options
"""
self._driver_dict.add(DriverDictKey.VENDOR_SW_COMPATIBLE, False)
def _got_chunk(self, chunk, ts):
"""
The base class got_data has gotten a chunk from the chunker.
We only generate sample particles and they cannot be verified (beyond size, which is done in the chunker).
Just create a particle, reset the scheduler and start the next scan.
@param chunk: data to process
@param ts: timestamp
"""
elapsed = time.time() - self.scan_start_time
self.in_scan = False
log.debug('_got_chunk: Received complete scan. AP: %d NF: %d SIZE: %d ET: %d secs',
self._param_dict.get(Parameter.AP),
self._param_dict.get(Parameter.NF),
len(chunk),
elapsed)
self._driver_event(DriverAsyncEvent.SAMPLE, RGASampleParticle(chunk, port_timestamp=ts).generate())
# Reset the scheduler and initiate the next scan if we are in the scan state
if self.get_current_state() == ProtocolState.SCAN:
self._build_scheduler()
self._async_raise_fsm_event(ProtocolEvent.TAKE_SCAN)
def _generic_response_handler(self, resp, prompt, command=None):
"""
Generic response handler. Shove the results into the param dict.
The associated command should be frozen when the response handler is registered using functools.partial
@param resp: command response
@param prompt: not used, required to match signature
@param command: command which generated response
@return: response
"""
parameter = getattr(Parameter, command, None)
log.debug('_generic_response_handler: command: %s parameter: %s resp: %s', command, parameter, resp)
if parameter in self._param_dict.get_keys():
if parameter == Parameter.FL:
parameter = Parameter.FL_ACTUAL
try:
self._param_dict.set_value(parameter, self._param_dict.format(parameter, resp))
except ValueError:
# bad data? Don't set the value, but keep the driver moving forward
# verify the data if necessary downstream.
pass
return resp
def _generic_build_handler(self, command, *args, **kwargs):
"""
Generic build handler. If a value is passed, then this is a set, otherwise it's a query...
@param command: command to build
@param args: arglist which may contain a value
@return: command string
"""
if len(args) == 1:
# this is a set action
value = args[0]
return self._build_rga_set(command, value) + NEWLINE
# this is a query
return self._build_rga_query(command) + NEWLINE
def _build_rga_set(self, command, value):
"""
Build a set command
@param command: command to build
@param value: value to set
@return: command string
"""
return command + str(value)
def _build_rga_query(self, command):
"""
Build a query command
@param command: command to build
@return: command string
"""
return command + '?'
def _filter_capabilities(self, events):
"""
Return a list of currently available capabilities.
@param events: list of events to be filtered
@return: list of events which are in capability
"""
return [x for x in events if Capability.has(x)]
def _wakeup(self, timeout, delay=1):
"""
Wakeup not required for this instrument
"""
def _build_scheduler(self):
"""
Remove any previously scheduled event, then generate an absolute trigger to schedule the next
scan in case we lose some data and the next scan isn't triggered by got_chunk.
"""
try:
self._remove_scheduler(ScheduledJob.TAKE_SCAN)
log.debug('Successfully removed existing scheduled event TAKE_SCAN.')
except KeyError as ke:
log.debug('KeyError: %s', ke)
# this formula was derived from testing, should yield a slightly higher time than the actual
# time required to collect a single scan.
delay = self._param_dict.get(Parameter.AP) / 9 / self._param_dict.get(Parameter.NF) + 5
if delay > 0:
dt = datetime.datetime.now() + datetime.timedelta(seconds=delay)
job_name = ScheduledJob.TAKE_SCAN
config = {
DriverConfigKey.SCHEDULER: {
job_name: {
DriverSchedulerConfigKey.TRIGGER: {
DriverSchedulerConfigKey.TRIGGER_TYPE: TriggerType.ABSOLUTE,
DriverSchedulerConfigKey.DATE: dt
},
}
}
}
self.set_init_params(config)
self._add_scheduler_event(ScheduledJob.TAKE_SCAN, ProtocolEvent.TIMEOUT)
def _update_params(self, *args, **kwargs):
"""
Parameters are NOT set in the instrument by this method, as the RGA is configured anytime
a scan is started, as it may have been powered off since the last time we saw it.
"""
def _set_params(self, *args, **kwargs):
"""
Set parameters, raise a CONFIG_CHANGE event if necessary.
@throws InstrumentParameterException
"""
self._verify_not_readonly(*args, **kwargs)
params_to_set = args[0]
old_config = self._param_dict.get_all()
# check if in range
constraints = ParameterConstraints.dict()
parameters = Parameter.reverse_dict()
# step through the list of parameters
for key, val in params_to_set.iteritems():
# if constraint exists, verify we have not violated it
constraint_key = parameters.get(key)
if constraint_key in constraints:
var_type, minimum, maximum = constraints[constraint_key]
try:
value = var_type(val)
except ValueError:
raise exceptions.InstrumentParameterException(
'Unable to verify type - parameter: %s value: %s' % (key, val))
if val < minimum or val > maximum:
raise exceptions.InstrumentParameterException(
'Value out of range - parameter: %s value: %s min: %s max: %s' %
(key, val, minimum, maximum))
# all constraints met or no constraints exist, set the values
for key, val in params_to_set.iteritems():
if key in old_config:
self._param_dict.set_value(key, val)
else:
raise exceptions.InstrumentParameterException(
'Attempted to set unknown parameter: %s value: %s' % (key, val))
new_config = self._param_dict.get_all()
# If we changed anything, raise a CONFIG_CHANGE event
if old_config != new_config:
self._driver_event(DriverAsyncEvent.CONFIG_CHANGE)
def _check_error_byte(self, error_string):
"""
Check the error byte as returned by some commands
@param error_string: byte to be checked for errors
@throws InstrumentStateException
"""
# trim, just in case we received some garbage with our response...
if len(error_string) > 1:
error_string = error_string[-1]
if int(error_string):
self._async_raise_fsm_event(ProtocolEvent.ERROR)
error = 'RGA Error byte set: %s' % error_string
self._param_dict.set_value(Parameter.ERROR_REASON, error)
self._driver_event(DriverAsyncEvent.CONFIG_CHANGE)
raise exceptions.InstrumentStateException(error)
def _set_instrument_parameter(self, command):
"""
Set a parameter on the instrument.
We will attempt up to MAX_SET_RETRIES to set the value correctly, according to the following sequence:
1. send set command
2. verify error byte, if returned (per Responses)
3. send query command
4. verify returned value equals the set value (within tolerance)
@throws InstrumentParameterException
"""
response_type = getattr(Responses, command)
parameter = getattr(Parameter, command)
# store the configured setting
old_value = self._param_dict.format(parameter)
if old_value is None:
raise exceptions.InstrumentParameterException('Missing required instrument parameter: %s' % parameter)
log.debug('response_type: %s parameter: %s command: %s', response_type, getattr(Parameter, command), command)
# attempt to set the value up to MAX_SET_RETRIES times
for x in xrange(MAX_RETRIES):
if response_type == STATUS:
resp = self._do_cmd_resp(command, old_value)
self._check_error_byte(resp)
else:
self._do_cmd_no_resp(command, old_value)
# query the value from the instrument to load the parameter dictionary
self._do_cmd_resp(command)
# if values match, we were successful, return.
difference = abs(self._param_dict.format(parameter) - old_value)
if difference < CLOSE_ENOUGH:
return
log.error('Set attempt failed. Parameter: %s Set value: %s Returned value: %s difference: %.2f',
parameter, old_value, self._param_dict.get(parameter), difference)
# configuring the RGA failed, restore the setting from our configuration and raise an exception
self._param_dict.set_value(parameter, old_value)
raise exceptions.InstrumentParameterException('Unable to set instrument parameter: %s, attempted %d times' %
(parameter, MAX_RETRIES))
def _build_sieve_function(self):
"""
Build a sieve function based on the expected data size. Replace the previous sieve function in
the chunker. This should happen during the configuration phase.
"""
num_points = int(self._param_dict.get(Parameter.AP))
match_string = r'(?<=%s)(.{%d})' % (SCAN_START_SENTINEL, (num_points + 1) * 4)
matcher = re.compile(match_string, re.DOTALL)
def my_sieve(raw_data):
return_list = []
log.debug('SIEVE: pattern=%r, raw_data_len=%d', matcher.pattern, len(raw_data))
# do not descend into this loop unless we are at log level trace...
if log.isEnabledFor('trace'):
temp = raw_data[:]
while temp:
log.trace('SIEVE: raw_data: %s', temp[:32].encode('hex'))
if len(temp) > 32:
temp = temp[32:]
else:
temp = ''
for match in matcher.finditer(raw_data):
# if sentinel value present in this slice it is invalid
if not SCAN_START_SENTINEL in raw_data[match.start():match.end()]:
return_list.append((match.start(), match.end()))
return return_list
self._chunker.sieve = my_sieve
def _verify_filament(self):
"""
Ensure the filament is on and the current is within tolerance
@throws InstrumentProtocolException
"""
self._do_cmd_resp(InstrumentCommand.FILAMENT_EMISSION)
filament_difference = abs(1 - self._param_dict.get(Parameter.FL_ACTUAL))
if filament_difference > CLOSE_ENOUGH:
self._async_raise_fsm_event(ProtocolEvent.ERROR)
error = 'Filament power not withing tolerance (%.2f): %.2f' % (CLOSE_ENOUGH, filament_difference)
self._param_dict.set_value(Parameter.ERROR_REASON, error)
self._driver_event(DriverAsyncEvent.CONFIG_CHANGE)
raise exceptions.InstrumentProtocolException(error)
def _stop_instrument(self):
"""
Stop any running scan, flush the output buffer, turn off the filament and CDEM.
Update the parameter dictionary for FL.
"""
try:
self._remove_scheduler(ScheduledJob.TAKE_SCAN)
log.debug('Successfully removed existing scheduled event TAKE_SCAN.')
except KeyError as ke:
log.debug('KeyError: %s', ke)
self._do_cmd_resp(InstrumentCommand.INITIALIZE, 0)
self._do_cmd_resp(InstrumentCommand.INITIALIZE, 2)
self._do_cmd_resp(InstrumentCommand.FILAMENT_EMISSION)
self.in_scan = False
########################################################################
# Unknown handlers.
########################################################################
def _handler_unknown_discover(self, *args, **kwargs):
"""
Discover current state
@return (next_state, result)
"""
return ProtocolState.COMMAND, ResourceAgentState.IDLE
########################################################################
# Command handlers.
########################################################################
def _handler_command_get(self, *args, **kwargs):
"""
Get parameter
"""
return self._handler_get(*args, **kwargs)
def _handler_command_set(self, *args, **kwargs):
"""
Set parameter
"""
self._set_params(*args, **kwargs)
return None, None
def _handler_command_start_direct(self):
"""
Start direct access
@return next_state, (next_agent_state, None)
"""
return ProtocolState.DIRECT_ACCESS, (ResourceAgentState.DIRECT_ACCESS, None)
def _handler_command_start_scan(self):
"""
Start a scan
@return next_state, (next_agent_state, None)
"""
return ProtocolState.SCAN, (ResourceAgentState.STREAMING, None)
########################################################################
# Direct access handlers.
########################################################################
def _handler_direct_access_enter(self, *args, **kwargs):
"""
Enter direct access state.
"""
# Tell driver superclass to send a state change event.
# Superclass will query the state.
self._driver_event(DriverAsyncEvent.STATE_CHANGE)
self._sent_cmds = []
def _handler_direct_access_execute_direct(self, data):
"""
Forward direct access commands to the instrument.
@return next_state, (next_agent_state, None)
"""
self._do_cmd_direct(data)
# add sent command to list for 'echo' filtering in callback
self._sent_cmds.append(data)
return None, (None, None)
def _handler_direct_access_stop_direct(self):
"""
Stop direct access, return to COMMAND.
@return next_state, (next_agent_state, None)
"""
return ProtocolState.COMMAND, (ResourceAgentState.COMMAND, None)
########################################################################
# Scan handlers
########################################################################
def _handler_scan_enter(self, *args, **kwargs):
"""
Enter the scan state. Configure the RGA, start the first scan and the scheduler.
@throws InstrumentTimeoutException
"""
for attempt in range(1, MAX_RETRIES+1):
try:
self._handler_scan_configure_rga()
self._async_raise_fsm_event(ProtocolEvent.TAKE_SCAN)
self._build_scheduler()
self._driver_event(DriverAsyncEvent.STATE_CHANGE)
return
except exceptions.InstrumentTimeoutException:
log.error('Failed to configure the RGA - attempt %d', attempt)
self._async_raise_fsm_event(ProtocolEvent.ERROR)
error = 'Failed to configure RGA and start scanning.'
self._param_dict.set_value(Parameter.ERROR_REASON, error)
self._driver_event(DriverAsyncEvent.CONFIG_CHANGE)
raise exceptions.InstrumentTimeoutException(error)
def _handler_scan_exit(self, *args, **kwargs):
"""
Exit scan. Delete the scheduler.
"""
try:
self._remove_scheduler(ScheduledJob.TAKE_SCAN)
except KeyError:
log.error("_remove_scheduler could not find: %s", ScheduledJob.TAKE_SCAN)
def _handler_scan_configure_rga(self):
"""
Send the appropriate configuration to the RGA and update the chunker sieve function for the
correct data length.
"""
# initialize the connection
self._do_cmd_resp(InstrumentCommand.INITIALIZE, 0)
# set these
set_commands = [
(InstrumentCommand.ELECTRON_ENERGY, Parameter.EE),
(InstrumentCommand.ION_ENERGY, Parameter.IE),
(InstrumentCommand.FOCUS_VOLTAGE, Parameter.VF),
(InstrumentCommand.NOISE_FLOOR, Parameter.NF),
(InstrumentCommand.STEPS_PER_AMU, Parameter.SA),
(InstrumentCommand.INITIAL_MASS, Parameter.MI),
(InstrumentCommand.FINAL_MASS, Parameter.MF),
]
for command, parameter in set_commands:
self._set_instrument_parameter(command)
# turn on the filament
self._set_instrument_parameter(InstrumentCommand.FILAMENT_EMISSION)
# query the read only items
for command in [InstrumentCommand.READINGS_PER_SCAN, InstrumentCommand.FILAMENT_EMISSION,
InstrumentCommand.ID, InstrumentCommand.CHECK_ERRORS]:
self._do_cmd_resp(command)
# publish the config as a status particle
pd = self._param_dict.get_all()
log.debug('parameter dictionary: %r', pd)
ts = ntplib.system_to_ntp_time(time.time())
self._driver_event(DriverAsyncEvent.SAMPLE, RGAStatusParticle(pd, port_timestamp=ts).generate())
# replace the sieve function
self._build_sieve_function()
def _handler_scan_take_scan(self, *args, **kwargs):
"""
place a sentinel value in the chunker, then perform one analog scan from the RGA
@return next_state, (next_agent_state, None)
"""
# empty the chunker
self._chunker.clean()
# place sentinel value in chunker
self._chunker.add_chunk(SCAN_START_SENTINEL, ntplib.system_to_ntp_time(time.time()))
self.scan_start_time = time.time()
if self.in_scan:
log.error('FAILED scan detected, in_scan sentinel set to TRUE')
self.in_scan = True
self._do_cmd_no_resp(InstrumentCommand.ANALOG_SCAN, 1)
return None, (None, None)
def _handler_scan_timeout(self, *args, **kwargs):
"""
Handle scan timeout
@return next_state, (next_agent_state, None)
"""
# timeout, clear the instrument buffers
self._do_cmd_resp(InstrumentCommand.INITIALIZE, 0)
# verify the filament is still on
self._verify_filament()
return self._handler_scan_take_scan()
def _handler_scan_stop_scan(self, *args, **kwargs):
"""
Stop scanning, go to COMMAND.
@return next_state, (next_agent_state, None)
"""
self._stop_instrument()
return ProtocolState.COMMAND, (ResourceAgentState.COMMAND, None)
def _handler_scan_error(self, *args, **kwargs):
"""
Stop scanning, go to ERROR.
@return next_state, (next_agent_state, None)
"""
self._stop_instrument()
return ProtocolState.ERROR, (ResourceAgentState.COMMAND, None)
########################################################################
# Error handlers
########################################################################
def _handler_error_clear(self):
"""
Leave the error state, return to COMMAND.
@return next_state, (next_agent_state, None)
"""
self._param_dict.set_value(Parameter.ERROR_REASON, '')
self._driver_event(DriverAsyncEvent.CONFIG_CHANGE)
return ProtocolState.COMMAND, (ResourceAgentState.COMMAND, None)
########################################################################
# Generic handlers
########################################################################
def _handler_generic_enter(self):
"""
Generic method to handle entering state.
"""
if self.get_current_state() != ProtocolState.UNKNOWN:
self._init_params()
self._driver_event(DriverAsyncEvent.STATE_CHANGE)
def _handler_generic_exit(self):
"""
