"""Impressions model module."""

from collections import namedtuple

Impression = namedtuple(

'Impression',

[

'matching_key',

'feature_name',

'treatment',

'label',

'change_number',

'bucketing_key',

'time',

'previous_time'

]

)

# pre-python3.7 hack to make previous_time optional

Impression.__new__.__defaults__ = (None,)

class Label(object): # pylint: disable=too-few-public-methods

"""Impressions labels."""

# Condition: Split Was Killed

# Treatment: Default treatment

# Label: killed

KILLED = 'killed'

# Condition: No condition matched

# Treatment: Default Treatment

# Label: no condition matched

NO_CONDITION_MATCHED = 'default rule'

# Condition: Split definition was not found

# Treatment: control

# Label: split not found

SPLIT_NOT_FOUND = 'definition not found'

# Condition: Traffic allocation failed

# Treatment: Default Treatment

# Label: not in split

NOT_IN_SPLIT = 'not in split'

# Condition: There was an exception

# Treatment: control

# Label: exception

EXCEPTION = 'exception'

# Condition: Evaluation requested while client not ready

# Treatment: control

# Label: not ready

NOT_READY = 'not ready'