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11 changes: 9 additions & 2 deletions optimizely/decision_service.py
Original file line number Diff line number Diff line change
Expand Up @@ -457,7 +457,8 @@ 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:
# Skip UPS for CMAB experiments as they use dynamic decisions
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 +473,11 @@ def get_variation(
}
else:
self.logger.warning('User profile has invalid format.')
elif experiment.cmab:
message = f'Skipping user profile service for CMAB experiment "{experiment.key}". ' \
f'CMAB decisions are dynamic and not stored for sticky bucketing.'
self.logger.debug(message)
decide_reasons.append(message)

# Check audience conditions
audience_conditions = experiment.get_audience_conditions_or_ids()
Expand Down Expand Up @@ -529,7 +535,8 @@ 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:
# Skip UPS for CMAB experiments as they use dynamic decisions
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
223 changes: 223 additions & 0 deletions tests/test_decision_service.py
Original file line number Diff line number Diff line change
Expand Up @@ -1890,3 +1890,226 @@ 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_user_profile_lookup(self):
"""Test that CMAB experiments skip reading from User Profile Service."""
# Create a user context
user = optimizely_user_context.OptimizelyUserContext(
optimizely_client=None,
logger=None,
user_id="test_user",
user_attributes={}
)

# Create a CMAB experiment
cmab_experiment = entities.Experiment(
'111150',
'cmab_experiment',
'Running',
'111150',
[], # No audience IDs
{},
[
entities.Variation('111151', 'variation_1'),
entities.Variation('111152', 'variation_2')
],
[
{'entityId': '111151', 'endOfRange': 5000},
{'entityId': '111152', 'endOfRange': 10000}
],
cmab={'trafficAllocation': 5000}
)

# Create mock user profile tracker with stored decision
mock_user_profile_tracker = mock.Mock()
mock_user_profile = user_profile.UserProfile(user.user_id)
mock_user_profile.save_variation_for_experiment('111150', '111151')
mock_user_profile_tracker.get_user_profile.return_value = mock_user_profile

# Mock CMAB service to return a decision
mock_cmab_decision = {
'variation_id': '111152', # Different from stored variation
'cmab_uuid': 'test-uuid-123'
}

variation_2 = entities.Variation('111152', 'variation_2')

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=['111152', []]), \
mock.patch.object(self.decision_service.cmab_service, 'get_decision',
return_value=[mock_cmab_decision, []]), \
mock.patch.object(self.project_config, 'get_variation_from_id',
return_value=variation_2):

# Call get_variation with CMAB experiment and user profile tracker
result = self.decision_service.get_variation(
self.project_config,
cmab_experiment,
user,
mock_user_profile_tracker
)

# Verify that get_stored_variation was NOT called (UPS lookup skipped)
mock_user_profile_tracker.get_user_profile.assert_not_called()

# Verify CMAB decision was used (variation_2, not the stored variation_1)
self.assertIsNotNone(result['variation'])
self.assertEqual('111152', result['variation'].id)
self.assertEqual('test-uuid-123', result['cmab_uuid'])
self.assertFalse(result['error'])

# Verify debug message was logged
expected_message = 'Skipping user profile service for CMAB experiment "cmab_experiment". ' \
'CMAB decisions are dynamic and not stored for sticky bucketing.'
self.assertIn(expected_message, result['reasons'])

def test_get_variation_cmab_experiment_skips_user_profile_save(self):
"""Test that CMAB experiments skip writing to User Profile Service."""
# Create a user context
user = optimizely_user_context.OptimizelyUserContext(
optimizely_client=None,
logger=None,
user_id="test_user",
user_attributes={}
)

# Create a CMAB experiment
cmab_experiment = entities.Experiment(
'111150',
'cmab_experiment',
'Running',
'111150',
[],
{},
[entities.Variation('111151', 'variation_1')],
[{'entityId': '111151', 'endOfRange': 10000}],
cmab={'trafficAllocation': 5000}
)

# Create mock user profile tracker
mock_user_profile_tracker = mock.Mock()

# Mock CMAB service to return a decision
mock_cmab_decision = {
'variation_id': '111151',
'cmab_uuid': 'test-uuid-123'
}

variation_1 = entities.Variation('111151', 'variation_1')

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=['111151', []]), \
mock.patch.object(self.decision_service.cmab_service, 'get_decision',
return_value=[mock_cmab_decision, []]), \
mock.patch.object(self.project_config, 'get_variation_from_id',
return_value=variation_1):

# Call get_variation
result = self.decision_service.get_variation(
self.project_config,
cmab_experiment,
user,
mock_user_profile_tracker
)

# Verify that update_user_profile was NOT called (UPS save skipped)
mock_user_profile_tracker.update_user_profile.assert_not_called()

# Verify variation was still returned correctly
self.assertIsNotNone(result['variation'])
self.assertEqual('111151', result['variation'].id)
self.assertEqual('test-uuid-123', result['cmab_uuid'])
self.assertFalse(result['error'])

def test_get_variation_non_cmab_uses_user_profile_normally(self):
"""Test that non-CMAB experiments continue to use User Profile Service normally."""
# Create a user context
user = optimizely_user_context.OptimizelyUserContext(
optimizely_client=None,
logger=None,
user_id="test_user",
user_attributes={}
)

# Create a regular (non-CMAB) experiment (cmab='' means non-CMAB)
regular_experiment = entities.Experiment(
'111127',
'test_experiment',
'Running',
'111182',
['11154'],
{
'user_1': 'control',
'user_2': 'control'
},
[
entities.Variation('111128', 'control'),
entities.Variation('111129', 'variation')
],
{
'111128': 4000,
'111129': 8000
},
'' # Empty string means non-CMAB experiment
)

# Create mock user profile tracker with stored decision
mock_user_profile_tracker = mock.Mock()
mock_user_profile = user_profile.UserProfile(user.user_id)
mock_user_profile.save_variation_for_experiment('111127', '111128') # Stored: control
mock_user_profile_tracker.get_user_profile.return_value = mock_user_profile

# Mock get_stored_variation to return the stored variation
stored_variation = entities.Variation('111128', 'control')
with mock.patch('optimizely.helpers.experiment.is_experiment_running', return_value=True), \
mock.patch.object(self.decision_service, 'get_stored_variation',
return_value=stored_variation) as mock_get_stored:

# Call get_variation
result = self.decision_service.get_variation(
self.project_config,
regular_experiment,
user,
mock_user_profile_tracker
)

# Verify that get_stored_variation WAS called (UPS lookup used)
mock_get_stored.assert_called_once()

# Verify stored variation was returned
self.assertEqual(stored_variation, result['variation'])
self.assertIsNone(result['cmab_uuid'])
self.assertFalse(result['error'])

# Now test that saving to UPS works for non-CMAB experiments
mock_user_profile_tracker.reset_mock()

new_variation = entities.Variation('111129', 'variation')
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, 'get_stored_variation',
return_value=None), \
mock.patch.object(self.decision_service.bucketer, 'bucket',
return_value=[new_variation, []]):

# Call get_variation without stored decision
result = self.decision_service.get_variation(
self.project_config,
regular_experiment,
user,
mock_user_profile_tracker
)

# Verify that update_user_profile WAS called (UPS save used)
mock_user_profile_tracker.update_user_profile.assert_called_once_with(
regular_experiment,
new_variation
)

# Verify new variation was returned
self.assertIsNotNone(result['variation'])
self.assertEqual('111129', result['variation'].id)
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