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# Copyright 2022-present, the Waterdip Labs Pvt. Ltd. | ||
# | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
|
||
from datachecks.core.datasource.base import (SearchIndexDataSource, | ||
SQLDatasource) | ||
from datachecks.core.metric.base import (FieldMetrics, MetricIdentity, | ||
MetricsType) | ||
|
||
|
||
class FreshnessValueMetric(FieldMetrics): | ||
""" | ||
FreshnessMetric is a class that represents a metric that is generated by a data source. | ||
""" | ||
|
||
def get_metric_identity(self): | ||
return MetricIdentity.generate_identity( | ||
metric_type=MetricsType.FRESHNESS, | ||
metric_name=self.name, | ||
data_source=self.data_source, | ||
field_name=self.field_name, | ||
) | ||
|
||
def _generate_metric_value(self): | ||
if isinstance(self.data_source, SQLDatasource): | ||
return self.data_source.query_get_max( | ||
table=self.table_name, | ||
field=self.field_name, | ||
filters=self.filter_query if self.filter_query else None, | ||
) | ||
elif isinstance(self.data_source, SearchIndexDataSource): | ||
return self.data_source.query_get_time_diff( | ||
index_name=self.index_name, field=self.field_name | ||
) | ||
else: | ||
raise ValueError("Invalid data source type") |
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