# TestCsc¶

class lsst.ts.salobj.TestCsc(index, config_dir=None, initial_state=<State.STANDBY: 5>, settings_to_apply='', simulation_mode=0)

A simple CSC intended for unit testing.

Supported commands:

• setScalars and setArrays: output the provided data using the corresponding event and telemetry topics. Note that this violates the convention that telemetry is output at regular intervals, but it makes unit tests much easier to write.
• wait: wait for the specified amount of time, and, if requested, raise an exception. One use for this is to test command timeout by specifying a long wait and waiting a shorter time for the command to finish. Another use is to test multiple simultaneous commands, since wait supports this.
• The standard state transition commands do the usual thing and output the summaryState event. The exitControl command shuts the CSC down.
Parameters: index : int Index of Test component; each unit test method should use a different index. config_dir : str, optional Path to configuration files. initial_state : salobj.State, optional The initial state of the CSC. Typically one of: salobj.State.ENABLED if you want the CSC immediately usable. salobj.State.STANDBY if you want full emulation of a CSC. settings_to_apply : str, optional Settings to apply if initial_state is State.DISABLED or State.ENABLED. simulation_mode : int, optional Simulation mode. The only allowed value is 0. ValueError If config_dir is not a directory or initial_state is invalid. salobj.ExpectedError If simulation_mode is invalid. Note: you will only see this error if you await start_task.

Notes

Unlike a normal CSC this one does not output telemetry at regular intervals. Instead, in order to simplify unit tests, it outputs the arrays and scalars telemetry topics in reponse to the setArrays or setScalars command (just like the arrays and scalars events). That makes it more predictable when this data will appear. Note that the heartbeat event is output at regular intervals, as for any CSC.

Also, unlike most normal configurable CSCs, this one does not need to be configured in order to be used (though self.config will be None). Thus it is safe to start this CSC in the salobj.State.ENABLED state.

Error Codes

• 1: the fault command was executed

Attributes Summary

 arrays_fields Get a tuple of the fields in an arrays struct. config_dir Get or set the configuration directory. default_initial_state disabled_or_enabled Return True if the summary state is State.DISABLED or State.ENABLED. domain enable_cmdline_state field_type Get a dict of field_name: element type. int_fields Get a tuple of the integer fields in a struct. require_settings scalars_fields Get a tuple of the fields in a scalars struct. simulation_mode Get the current simulation mode. summary_state Get the summary state as a State enum. valid_simulation_modes version

Methods Summary

 add_arguments(parser) Add arguments to the parser created by make_from_cmd_line. add_kwargs_from_args(args, kwargs) Add constructor keyword arguments based on parsed arguments. amain(index, **kwargs) Make a CSC from command-line arguments and run it. as_dict(data, fields) Return the specified fields from a data struct as a dict. assert_arrays_equal(arrays1, arrays2) Assert that two arrays data structs are equal. assert_enabled([action]) Assert that an action that requires ENABLED state can be run. assert_scalars_equal(scalars1, scalars2) Assert that two scalars data structs are equal. begin_disable(data) Begin do_disable; called before state changes. begin_enable(data) Begin do_enable; called before state changes. begin_exitControl(data) Begin do_exitControl; called before state changes. begin_standby(data) Begin do_standby; called before the state changes. begin_start(data) Begin do_start; configure the CSC before changing state. close([exception, cancel_start]) Shut down, clean up resources and set done_task done. close_tasks() Shut down pending tasks. configure(config) Configure the CSC. do_disable(data) Transition from State.ENABLED to State.DISABLED. do_enable(data) Transition from State.DISABLED to State.ENABLED. do_exitControl(data) Transition from State.STANDBY to State.OFFLINE and quit. do_fault(data) Execute the fault command. do_setArrays(data) Execute the setArrays command. do_setAuthList(data) Update the authorization list. do_setLogLevel(data) Set logging level. do_setScalars(data) Execute the setScalars command. do_standby(data) Transition from State.DISABLED or State.FAULT to State.STANDBY. do_start(data) Transition from State.STANDBY to State.DISABLED. do_wait(data) Execute the wait command by waiting for the specified duration. end_disable(data) End do_disable; called after state changes but before command acknowledged. end_enable(data) End do_enable; called after state changes but before command acknowledged. end_exitControl(data) End do_exitControl; called after state changes but before command acknowledged. end_standby(data) End do_standby; called after state changes but before command acknowledged. end_start(data) End do_start; called after state changes but before command acknowledged. fault(code, report[, traceback]) Enter the fault state and output the errorCode event. get_config_pkg() Get the name of the configuration package, e.g. handle_summary_state() Called when the summary state has changed. implement_simulation_mode(simulation_mode) Implement going into or out of simulation mode. make_from_cmd_line(index, **kwargs) Construct a CSC from command line arguments. make_random_cmd_arrays() make_random_cmd_scalars() make_random_evt_arrays() make_random_evt_scalars() make_random_tel_arrays() make_random_tel_scalars() put_log_level() Output the logLevel event. read_config_dir() Set self.config_label_dict and output evt_settingVersions. report_summary_state() Report a new value for summary_state, including current state. set_simulation_mode(simulation_mode) Set the simulation mode. start() Finish constructing the CSC.

Attributes Documentation

arrays_fields

Get a tuple of the fields in an arrays struct.

config_dir

Get or set the configuration directory.

Parameters: config_dir : New configuration directory. config_dir : pathlib.Path Absolute path to the configuration directory. ValueError If the new configuration dir is not a directory.
default_initial_state = 5
disabled_or_enabled

Return True if the summary state is State.DISABLED or State.ENABLED.

This is useful in handle_summary_state to determine if you should start or stop a telemetry loop, and connect to or disconnect from an external controller

domain
enable_cmdline_state = True
field_type

Get a dict of field_name: element type.

int_fields

Get a tuple of the integer fields in a struct.

require_settings = False
scalars_fields

Get a tuple of the fields in a scalars struct.

simulation_mode

Get the current simulation mode.

0 means normal operation (no simulation).

Raises: ExpectedError If the new simulation mode is not a supported value.
summary_state

Get the summary state as a State enum.

valid_simulation_modes = [0]
version = '?'

Methods Documentation

classmethod add_arguments(parser)

Add arguments to the parser created by make_from_cmd_line.

Parameters: parser : argparse.ArgumentParser The argument parser.

Notes

If you override this method then you should almost certainly override add_kwargs_from_args as well.

classmethod add_kwargs_from_args(args, kwargs)

Add constructor keyword arguments based on parsed arguments.

Parameters: args : argparse.namespace Parsed command. kwargs : dict Keyword argument dict for the constructor. Update this based on args. The index argument will already be present if relevant.

Notes

If you override this method then you should almost certainly override add_arguments as well.

classmethod amain(index, **kwargs)

Make a CSC from command-line arguments and run it.

Parameters: index : If the CSC is indexed: specify True make index a required command-line argument that accepts any index, or an enum.IntEnum class to make index a required command-line argument that only accepts the enum values. If the CSC is not indexed specify None or 0. **kwargs : dict, optional Additional keyword arguments for your CSC’s constructor.
as_dict(data, fields)

Return the specified fields from a data struct as a dict.

Parameters: data : any The data to copy. fields : The names of the fields of data to copy.
assert_arrays_equal(arrays1, arrays2)

Assert that two arrays data structs are equal.

The types need not match; each struct can be command, event or telemetry data.

assert_enabled(action='')

Assert that an action that requires ENABLED state can be run.

Parameters: action : str, optional Action attempted. Not needed if this is called at the beginning of a do_... method, since the user will know what command was called.
assert_scalars_equal(scalars1, scalars2)

Assert that two scalars data structs are equal.

The types need not match; each struct can be command, event or telemetry data.

begin_disable(data)

Begin do_disable; called before state changes.

Parameters: data : DataType Command data
begin_enable(data)

Begin do_enable; called before state changes.

Parameters: data : DataType Command data
begin_exitControl(data)

Begin do_exitControl; called before state changes.

Parameters: data : DataType Command data
begin_standby(data)

Begin do_standby; called before the state changes.

Parameters: data : DataType Command data
begin_start(data)

Begin do_start; configure the CSC before changing state.

Parameters: data : cmd_start.DataType Command data

Notes

The settingsToApply field must be one of:

• The name of a config label or config file
• The name and version of a config file, formatted as <file_name>:<version>, where the version is a git reference, such as a git tag or commit hash. This form does not support labels.
close(exception=None, cancel_start=True)

Shut down, clean up resources and set done_task done.

May be called multiple times. The first call closes the Controller; subsequent calls wait until the Controller is closed.

Subclasses should override close_tasks instead of close, unless you have a good reason to do otherwise.

Parameters: exception : Exception, optional The exception that caused stopping, if any, in which case the self.done_task exception is set to this value. Specify None for a normal exit, in which case the self.done_task result is set to None. cancel_start : bool, optional Cancel the start task? Leave this true unless calling this from the start task.

Notes

Removes the SAL log handler, calls close_tasks to stop all background tasks, pauses briefly to allow final SAL messages to be sent, then closes the dds domain.

close_tasks()

Shut down pending tasks. Called by close.

configure(config)

Configure the CSC.

Parameters: config : object The configuration as described by the schema at schema_path, as a struct-like object.

Notes

Called when running the start command, just before changing summary state from State.STANDBY to State.DISABLED.

do_disable(data)

Transition from State.ENABLED to State.DISABLED.

Parameters: data : cmd_disable.DataType Command data
do_enable(data)

Transition from State.DISABLED to State.ENABLED.

Parameters: data : cmd_enable.DataType Command data
do_exitControl(data)

Transition from State.STANDBY to State.OFFLINE and quit.

Parameters: data : cmd_exitControl.DataType Command data
do_fault(data)

Execute the fault command.

Change the summary state to State.FAULT

do_setArrays(data)

Execute the setArrays command.

do_setAuthList(data)

Update the authorization list.

Parameters: data : cmd_setAuthList.DataType Authorization lists.

Notes

Add items if the data string starts with “+”, ignoring duplicates (both with respect to the existing items and within the data string). Remove items if the data string starts with “-“, ignoring missing items (items specified for removal that do not exist). Ignore whitespace after each comma and after the +/- prefix.

do_setLogLevel(data)

Set logging level.

Parameters: data : cmd_setLogLevel.DataType Logging level.
do_setScalars(data)

Execute the setScalars command.

do_standby(data)

Transition from State.DISABLED or State.FAULT to State.STANDBY.

Parameters: data : cmd_standby.DataType Command data
do_start(data)

Transition from State.STANDBY to State.DISABLED.

Parameters: data : cmd_start.DataType Command data
do_wait(data)

Execute the wait command by waiting for the specified duration.

If duration is negative then wait for abs(duration) but do not acknowledge the command as “in progress”. This is useful for testing command timeout.

end_disable(data)

End do_disable; called after state changes but before command acknowledged.

Parameters: data : DataType Command data
end_enable(data)

End do_enable; called after state changes but before command acknowledged.

Parameters: data : DataType Command data
end_exitControl(data)

End do_exitControl; called after state changes but before command acknowledged.

Parameters: data : DataType Command data
end_standby(data)

End do_standby; called after state changes but before command acknowledged.

Parameters: data : DataType Command data
end_start(data)

End do_start; called after state changes but before command acknowledged.

Parameters: data : DataType Command data
fault(code, report, traceback='')

Enter the fault state and output the errorCode event.

Parameters: code : int Error code for the errorCode event. If None then errorCode is not output and you should output it yourself. Specifying None is deprecated; please always specify an integer error code. report : str Description of the error. traceback : str, optional Description of the traceback, if any.
static get_config_pkg()

Get the name of the configuration package, e.g. “ts_config_ocs”.

handle_summary_state()

Called when the summary state has changed.

Override to perform tasks such as starting and stopping telemetry (example).

Notes

The versions in BaseCsc and ConfigurableCsc do nothing, so if you subclass one of those you do not need to call await super().handle_summary_state().

implement_simulation_mode(simulation_mode)

Implement going into or out of simulation mode.

Deprecated. See simulation mode for details.

Parameters: simulation_mode : int Requested simulation mode; 0 for normal operation. ExpectedError If simulation_mode is not a supported value.
classmethod make_from_cmd_line(index, **kwargs)

Construct a CSC from command line arguments.

Parameters: index : If the CSC is indexed: specify True make index a required command-line argument that accepts any index, or an enum.IntEnum class to make index a required command-line argument that only accepts the enum values. If the CSC is not indexed specify None or 0. **kwargs : dict, optional Additional keyword arguments for your CSC’s constructor. csc : cls The CSC.

Notes

To add additional command-line arguments, override add_arguments and add_kwargs_from_args.

make_random_cmd_arrays()
make_random_cmd_scalars()
make_random_evt_arrays()
make_random_evt_scalars()
make_random_tel_arrays()
make_random_tel_scalars()
put_log_level()

Output the logLevel event.

read_config_dir()

Set self.config_label_dict and output evt_settingVersions.

Set self.config_label_dict from self.config_dir/_labels.yaml. Output the settingVersions event (if changed) as follows:

• recommendedSettingsLabels is a comma-separated list of labels in self.config_label_dict, truncated by omitting labels if necessary.
• recommendedSettingsVersion is derived from git information for self.config_dir, if it is a git repository, else “”.
report_summary_state()

Report a new value for summary_state, including current state.

Subclasses may wish to override for code that depends on the current state (rather than the state transition command that got it into that state).

set_simulation_mode(simulation_mode)

Set the simulation mode.

Await implement_simulation_mode, update the simulation mode property and report the new value.

Parameters: simulation_mode : int Requested simulation mode; 0 for normal operation.
start()

Finish constructing the CSC.