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12 changes: 10 additions & 2 deletions optimizely/decision_service.py
Original file line number Diff line number Diff line change
Expand Up @@ -457,7 +457,10 @@ def get_variation(
}

# Check to see if user has a decision available for the given experiment
if user_profile_tracker is not None and not ignore_user_profile:
# CMAB experiments are excluded from UPS because UPS maintains decisions
# across the experiment lifetime without considering TTL or user attributes,
# which contradicts CMAB's dynamic nature.
if user_profile_tracker is not None and not ignore_user_profile and not experiment.cmab:
variation = self.get_stored_variation(project_config, experiment, user_profile_tracker.get_user_profile())
if variation:
message = f'Returning previously activated variation ID "{variation}" of experiment ' \
Expand All @@ -472,6 +475,10 @@ def get_variation(
}
else:
self.logger.warning('User profile has invalid format.')
elif experiment.cmab and user_profile_tracker is not None and not ignore_user_profile:
message = f'Skipping user profile service for CMAB experiment "{experiment.key}".'
self.logger.info(message)
decide_reasons.append(message)

# Check audience conditions
audience_conditions = experiment.get_audience_conditions_or_ids()
Expand Down Expand Up @@ -529,7 +536,8 @@ def get_variation(
self.logger.info(message)
decide_reasons.append(message)
# Store this new decision and return the variation for the user
if user_profile_tracker is not None and not ignore_user_profile:
# CMAB experiments are excluded from UPS to preserve dynamic decision-making.
if user_profile_tracker is not None and not ignore_user_profile and not experiment.cmab:
try:
user_profile_tracker.update_user_profile(experiment, variation)
except:
Expand Down
176 changes: 176 additions & 0 deletions tests/test_decision_service.py
Original file line number Diff line number Diff line change
Expand Up @@ -1890,3 +1890,179 @@ def test_get_variation_for_feature_returns_rollout_in_experiment_bucket_range_25
mock_config_logging.debug.assert_called_with(
'Assigned bucket 4000 to user with bucketing ID "test_user".')
mock_generate_bucket_value.assert_called_with("test_user211147")

def test_get_variation_cmab_experiment_skips_ups_lookup(self):
"""Test that get_variation skips UPS lookup for CMAB experiments."""

user = optimizely_user_context.OptimizelyUserContext(
optimizely_client=None,
logger=None,
user_id="test_user",
user_attributes={}
)

cmab_experiment = entities.Experiment(
'111150',
'cmab_experiment',
'Running',
'111150',
[],
{},
[
entities.Variation('111151', 'variation_1'),
entities.Variation('111152', 'variation_2')
],
[
{'entityId': '111151', 'endOfRange': 5000},
{'entityId': '111152', 'endOfRange': 10000}
],
cmab={'trafficAllocation': 5000}
)

user_profile_service = user_profile.UserProfileService()
user_profile_tracker = user_profile.UserProfileTracker(user.user_id, user_profile_service)

with mock.patch('optimizely.helpers.experiment.is_experiment_running', return_value=True), \
mock.patch('optimizely.helpers.audience.does_user_meet_audience_conditions',
return_value=[True, []]), \
mock.patch.object(self.decision_service.bucketer, 'bucket_to_entity_id',
return_value=['$', []]), \
mock.patch.object(self.decision_service, 'cmab_service') as mock_cmab_service, \
mock.patch.object(self.project_config, 'get_variation_from_id',
return_value=entities.Variation('111151', 'variation_1')), \
mock.patch(
'optimizely.decision_service.DecisionService.get_stored_variation'
) as mock_get_stored_variation, \
mock.patch.object(self.decision_service, 'logger') as mock_logger:

mock_cmab_service.get_decision.return_value = (
{'variation_id': '111151', 'cmab_uuid': 'test-cmab-uuid'},
[]
)

variation_result = self.decision_service.get_variation(
self.project_config,
cmab_experiment,
user,
user_profile_tracker
)

# UPS lookup should NOT be called for CMAB experiments
mock_get_stored_variation.assert_not_called()

# Should still get a valid variation from CMAB service
self.assertEqual(entities.Variation('111151', 'variation_1'), variation_result['variation'])
self.assertEqual('test-cmab-uuid', variation_result['cmab_uuid'])
self.assertStrictFalse(variation_result['error'])

# Should log that UPS was skipped for CMAB
mock_logger.info.assert_any_call(
'Skipping user profile service for CMAB experiment "cmab_experiment".'
)
self.assertIn(
'Skipping user profile service for CMAB experiment "cmab_experiment".',
variation_result['reasons']
)

def test_get_variation_cmab_experiment_skips_ups_save(self):
"""Test that get_variation skips saving to UPS for CMAB experiments."""

user = optimizely_user_context.OptimizelyUserContext(
optimizely_client=None,
logger=None,
user_id="test_user",
user_attributes={}
)

cmab_experiment = entities.Experiment(
'111150',
'cmab_experiment',
'Running',
'111150',
[],
{},
[
entities.Variation('111151', 'variation_1'),
entities.Variation('111152', 'variation_2')
],
[
{'entityId': '111151', 'endOfRange': 5000},
{'entityId': '111152', 'endOfRange': 10000}
],
cmab={'trafficAllocation': 5000}
)

user_profile_service = user_profile.UserProfileService()
user_profile_tracker = user_profile.UserProfileTracker(user.user_id, user_profile_service)

with mock.patch('optimizely.helpers.experiment.is_experiment_running', return_value=True), \
mock.patch('optimizely.helpers.audience.does_user_meet_audience_conditions',
return_value=[True, []]), \
mock.patch.object(self.decision_service.bucketer, 'bucket_to_entity_id',
return_value=['$', []]), \
mock.patch.object(self.decision_service, 'cmab_service') as mock_cmab_service, \
mock.patch.object(self.project_config, 'get_variation_from_id',
return_value=entities.Variation('111151', 'variation_1')), \
mock.patch.object(user_profile_tracker, 'update_user_profile') as mock_update_profile, \
mock.patch.object(self.decision_service, 'logger'):

mock_cmab_service.get_decision.return_value = (
{'variation_id': '111151', 'cmab_uuid': 'test-cmab-uuid'},
[]
)

variation_result = self.decision_service.get_variation(
self.project_config,
cmab_experiment,
user,
user_profile_tracker
)

# UPS save should NOT be called for CMAB experiments
mock_update_profile.assert_not_called()

# Should still return a valid variation
self.assertEqual(entities.Variation('111151', 'variation_1'), variation_result['variation'])
self.assertEqual('test-cmab-uuid', variation_result['cmab_uuid'])

def test_get_variation_non_cmab_experiment_uses_ups(self):
"""Test that get_variation still uses UPS for non-CMAB experiments (regression test)."""

user = optimizely_user_context.OptimizelyUserContext(
optimizely_client=None,
logger=None,
user_id="test_user",
user_attributes={}
)

experiment = self.project_config.get_experiment_from_key('test_experiment')

user_profile_service = user_profile.UserProfileService()
user_profile_tracker = user_profile.UserProfileTracker(user.user_id, user_profile_service)

stored_variation = entities.Variation('111129', 'variation')

with mock.patch('optimizely.helpers.experiment.is_experiment_running', return_value=True), \
mock.patch('optimizely.decision_service.DecisionService.get_forced_variation',
return_value=[None, []]), \
mock.patch('optimizely.decision_service.DecisionService.get_whitelisted_variation',
return_value=[None, []]), \
mock.patch(
'optimizely.decision_service.DecisionService.get_stored_variation',
return_value=stored_variation
) as mock_get_stored_variation:

variation_result = self.decision_service.get_variation(
self.project_config,
experiment,
user,
user_profile_tracker
)

# UPS lookup SHOULD be called for non-CMAB experiments
mock_get_stored_variation.assert_called_once_with(
self.project_config, experiment, user_profile_tracker.get_user_profile()
)

# Should return the stored variation
self.assertEqual(stored_variation, variation_result['variation'])
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