BaseEssRule¶

class lsst.ts.watcher.BaseEssRule(*, config, name, topic_attr_name, field_name, sensor_info_name, big_is_bad, is_indexed, units, value_format='0.2f')¶

Bases: PollingRule

Check one kind of ESS data, e.g. temperature or humidity.

Parameters:

configstruct

Rule configuration. The following fields are read:

warning_level : float | None Warning level. None to not use this level.
serious_level : float | None Serious level. None to not use this level.
critical_level : float | None Critical level. None to not use this level.
hysteresis : float The amount by which the measurement must decrease below (or increase above if big_is_bad false) a severity level, before alarm severity is decreased.
{sensor_info_name} A field whose name is given by sensor_info_name that contains information about the sensors to read. A list of dicts whose format depends on is_indexed. If is_indexed false, the fields are:
- sal_index : int SAL index of topic.
- sensor_names : list[str] A list of sensor names.
If is_indexed true, the fields are:
- sal_index : int SAL index of topic.
- sensor_info : list[dict[str, str | list[int]]] A list of topic-specific sensor info with fields:
  - sensor_name : str Name of sensor.
  - indices : list[int], optional Indices of field to read. If omitted then read all non-nan values.
warning_msg : str, optional The first part of the reason string for a warning alarm. This should say what the operators should do.
serious_msg : str, optional The first part of the reason string for a serious alarm. This should say what the operators should do.
critical_msg : str, optional The first part of the reason string for a critical alarm. This should say what the operators should do.

namestr

The name of the rule.

topic_attr_namestr

The attr name of the ESS telemetry topic, e.g. “tel_temperature” or “tel_relativeHumidity”.

field_namestr

The name of the ESS topic field, e.g. “temperatureItem” or “humidity”.

sensor_info_namestr

Name of sensor info field in config.

is_indexedbool

Is the field indexed? This controls the format of sensor info in the config.

unitsstr

Units of measurement.

value_formatstr, optional

Format for float value (threshold level or measured value) without a leading colon, e.g. “0.2f”

Notes

This uses FilteredEssFieldWrapper and its kin, because ESS data must be filtered by the value of the sensorName field (and index, if the data is array-valued).

Attributes:

PollingRule attributes: All attributes from PollingRule, plus:
field_wrappersFieldWrapperList: Wrappers for ESS telemetry fields.
sensorsdict: Sensor configuration (the config field specified by sensor_field_info_name).
threshold_handlerThresholdHandler: Threshold handler for ESS data.

Attributes Summary

name

Get the rule name.

Methods Summary

`compute_alarm_severity`()	Compute and set alarm severity and reason.
`get_schema`()	Return a jsonschema as a `dict`, to validate configuration.
`is_usable`(disabled_sal_components)	Return True if rule can be used, despite disabled SAL components.
`make_config`(**kwargs)	Make a config from keyword arguments, after applying defaults.
`poll_loop`()
`setup`(model)	Create filtered topic wrappers
`start`()	Start any background tasks, such as a polling loop.
`stop`()	Stop all background tasks.
`update_alarm_severity`(**kwargs)	Compute and set alarm severity and reason.

Attributes Documentation

name¶: Get the rule name.

Methods Documentation

compute_alarm_severity() → tuple[lsst.ts.xml.enums.Watcher.AlarmSeverity, str] | None¶

Compute and set alarm severity and reason.

Parameters:

**kwargsdict [str, typing.Any]

Keyword arguments. If triggered by TopicCallback calling update_alarm_severity, the arguments will be as follows:

data : salobj.BaseMsgType Message from the topic described by topic_callback.
topic_callback : TopicCallback Topic callback wrapper.

Returns:

None, if no change or unknown, or a tuple of two values:
severity: lsst.ts.idl.enums.Watcher.AlarmSeverity: The new alarm severity.
reasonstr: Detailed reason for the severity, e.g. a string describing what value is out of range, and what the range is. If severity is NONE then this value is ignored (but still required) and the old reason is retained until the alarm is reset to nominal state.

Notes

You may return NoneNoReason if the alarm state is NONE.

abstract classmethod get_schema() → dict[str, Any]¶

Return a jsonschema as a dict, to validate configuration.

Notes

Please provide default values for all fields for which defaults make sense. This makes watcher configuration files easier to write.

If your rule has no configuration then return None.

We recommend that you write the schema as yaml, for compactness, then use yaml.safe_load to convert it to a dict. For example:

schema_yaml = """
    $schema: http://json-schema.org/draft-07/schema#
    description: Configuration for MyRule
    type: object
    properties:
    ...
    required: [...]
    additionalProperties: false
"""
return yaml.safe_load(schema_yaml)

is_usable(disabled_sal_components: set[tuple[str, int]]) → bool¶

Return True if rule can be used, despite disabled SAL components.

The default implementation returns true if all remotes used by this rule are enabled. Override if you need something more complicated. The attributes config, name and remote_info_list are all available when this method is called.

Parameters:

disabled_sal_componentsset [tuple [str, int]]

Set of disabled SAL components. Each element is a tuple of:

SAL component name (e.g. “ATPtg”)
SAL index

classmethod make_config(**kwargs: str) → SimpleNamespace¶

Make a config from keyword arguments, after applying defaults.

Parameters:

kwargs: The configuration, as a dict of property: name. The allowed properties and values are specified by the rule’s config schema.

Returns:

configtypes.SimpleNamespace: The rule configuration, with defaults applied as needed.

Raises:

jsonschema.ValidationError: If the provided kwargs are incorrect (missing keys, misspelled keys, incorrect data types…).

async poll_loop()¶

setup(model)¶

Create filtered topic wrappers

Parameters:

modelModel: The watcher model.

start()¶

Start any background tasks, such as a polling loop.

This is called when the watcher goes into the enabled state.

Notes

Do not assume that start is called before stop; the order depends on the initial state of the Watcher.

Immediate subclasses need not call super().start()

stop()¶

Stop all background tasks.

This is called when the watcher goes out of the enabled state, and must stop any tasks that might trigger an alarm state change.

Notes

Do not assume that start is called before stop; the order depends on the initial state of the Watcher.

This base implementation does nothing, so immediate subclasses need not call super().stop().

async update_alarm_severity(**kwargs: Any) → None¶

Compute and set alarm severity and reason.

This must run quickly. If computing alarm severity is expensive, override this method to start a thread that computes the data and create a background task to manage the thread, then return.

Parameters:

**kwargsdict [str, typing.Any]

Keyword arguments. If called by TopicCallback, the arguments will be as follows:

data : salobj.BaseMsgType Message from the topic described by topic_callback.
topic_callback : TopicCallback Topic callback wrapper.

Navigation

BaseEssRule¶