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Extract DataProfileScan to a separate module
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| from dataclasses import dataclass | ||
| import hashlib | ||
| from typing import Optional | ||
|
|
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| from dbt.adapters.bigquery import BigQueryConnectionManager | ||
| from google.cloud import dataplex_v1 | ||
| from google.protobuf import field_mask_pb2 | ||
|
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| @dataclass | ||
| class DataProfileScanSetting: | ||
| location: str | ||
| scan_id: Optional[str] | ||
|
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| project_id: str | ||
| dataset_id: str | ||
| table_id: str | ||
|
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| sampling_percent: Optional[float] | ||
| row_filter: Optional[str] | ||
| cron: Optional[str] | ||
|
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| def parent(self): | ||
| return f"projects/{self.project_id}/locations/{self.location}" | ||
|
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| def data_scan_name(self): | ||
| return f"{self.parent()}/dataScans/{self.scan_id}" | ||
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| class DataProfileScan: | ||
| def __init__(self, connections: BigQueryConnectionManager): | ||
| self.connections = connections | ||
|
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| # If the label `dataplex-dp-published-*` is not assigned, we cannot view the results of the Data Profile Scan from BigQuery | ||
| def _update_labels_with_data_profile_scan_labels( | ||
| self, | ||
| project_id: str, | ||
| dataset_id: str, | ||
| table_id: str, | ||
| location: str, | ||
| scan_id: str, | ||
| ): | ||
| table = self.connections.get_bq_table(project_id, dataset_id, table_id) | ||
| original_labels = table.labels | ||
| profile_scan_labels = { | ||
| "dataplex-dp-published-scan": scan_id, | ||
| "dataplex-dp-published-project": project_id, | ||
| "dataplex-dp-published-location": location, | ||
| } | ||
| table.labels = {**original_labels, **profile_scan_labels} | ||
| self.connections.get_thread_connection().handle.update_table(table, ["labels"]) | ||
|
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| # scan_id must be unique within the project and no longer than 63 characters, | ||
| # so generate an id that meets the constraints | ||
| def _generate_unique_scan_id(self, dataset_id: str, table_id: str) -> str: | ||
| md5 = hashlib.md5(f"{dataset_id}_{table_id}".encode("utf-8")).hexdigest() | ||
| return f"dbt-{table_id.replace('_', '-')}-{md5}"[:63] | ||
|
|
||
| def _create_or_update_data_profile_scan( | ||
| self, | ||
| client: dataplex_v1.DataScanServiceClient, | ||
| scan_setting: DataProfileScanSetting, | ||
| ): | ||
| data_profile_spec = dataplex_v1.DataProfileSpec( | ||
| sampling_percent=scan_setting.sampling_percent, | ||
| row_filter=scan_setting.row_filter, | ||
| ) | ||
| display_name = ( | ||
| f"Data Profile Scan for {scan_setting.table_id} in {scan_setting.dataset_id}" | ||
| ) | ||
| description = f"This is a Data Profile Scan for {scan_setting.project_id}.{scan_setting.dataset_id}.{scan_setting.table_id}. Created by dbt." | ||
| labels = { | ||
| "managed_by": "dbt", | ||
| } | ||
|
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||
| if scan_setting.cron: | ||
| trigger = dataplex_v1.Trigger( | ||
| schedule=dataplex_v1.Trigger.Schedule(cron=scan_setting.cron) | ||
| ) | ||
| else: | ||
| trigger = dataplex_v1.Trigger(on_demand=dataplex_v1.Trigger.OnDemand()) | ||
| execution_spec = dataplex_v1.DataScan.ExecutionSpec(trigger=trigger) | ||
|
|
||
| if all( | ||
| scan.name != scan_setting.data_scan_name() | ||
| for scan in client.list_data_scans(parent=scan_setting.parent()) | ||
| ): | ||
| data_scan = dataplex_v1.DataScan( | ||
| data=dataplex_v1.DataSource( | ||
| resource=f"//bigquery.googleapis.com/projects/{scan_setting.project_id}/datasets/{scan_setting.dataset_id}/tables/{scan_setting.table_id}" | ||
| ), | ||
| data_profile_spec=data_profile_spec, | ||
| execution_spec=execution_spec, | ||
| display_name=display_name, | ||
| description=description, | ||
| labels=labels, | ||
| ) | ||
| request = dataplex_v1.CreateDataScanRequest( | ||
| parent=scan_setting.parent(), | ||
| data_scan_id=scan_setting.scan_id, | ||
| data_scan=data_scan, | ||
| ) | ||
| client.create_data_scan(request=request).result() | ||
| else: | ||
| request = dataplex_v1.GetDataScanRequest( | ||
| name=scan_setting.data_scan_name(), | ||
| ) | ||
| data_scan = client.get_data_scan(request=request) | ||
|
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| data_scan.data_profile_spec = data_profile_spec | ||
| data_scan.execution_spec = execution_spec | ||
| data_scan.display_name = display_name | ||
| data_scan.description = description | ||
| data_scan.labels = labels | ||
|
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||
| update_mask = field_mask_pb2.FieldMask( | ||
| paths=[ | ||
| "data_profile_spec", | ||
| "execution_spec", | ||
| "display_name", | ||
| "description", | ||
| "labels", | ||
| ] | ||
| ) | ||
| request = dataplex_v1.UpdateDataScanRequest( | ||
| data_scan=data_scan, | ||
| update_mask=update_mask, | ||
| ) | ||
| client.update_data_scan(request=request).result() | ||
|
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| def create_or_update_data_profile_scan(self, config): | ||
| project_id = config.get("database") | ||
| dataset_id = config.get("schema") | ||
| table_id = config.get("name") | ||
|
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| data_profile_config = config.get("config").get("data_profile_scan", {}) | ||
|
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| # Skip if data_profile_scan is not configured | ||
| if not data_profile_config: | ||
| return None | ||
|
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| client = dataplex_v1.DataScanServiceClient() | ||
| scan_setting = DataProfileScanSetting( | ||
| location=data_profile_config["location"], | ||
| scan_id=data_profile_config.get( | ||
| "scan_id", self._generate_unique_scan_id(dataset_id, table_id) | ||
| ), | ||
| project_id=project_id, | ||
| dataset_id=dataset_id, | ||
| table_id=table_id, | ||
| sampling_percent=data_profile_config.get("sampling_percent", None), | ||
| row_filter=data_profile_config.get("row_filter", None), | ||
| cron=data_profile_config.get("cron", None), | ||
| ) | ||
|
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| # Delete existing data profile scan if it is disabled | ||
| if not data_profile_config.get("enabled", True): | ||
| client.delete_data_scan(name=scan_setting.data_scan_name()) | ||
| return None | ||
|
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| self._create_or_update_data_profile_scan(client, scan_setting) | ||
|
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| if not scan_setting.cron: | ||
| client.run_data_scan( | ||
| request=dataplex_v1.RunDataScanRequest(name=scan_setting.data_scan_name()) | ||
| ) | ||
|
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| self._update_labels_with_data_profile_scan_labels( | ||
| project_id, dataset_id, table_id, scan_setting.location, scan_setting.scan_id | ||
| ) |
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