feat: add grants for BigQuery (#5444)

Co-authored-by: eakmanrq <6326532+eakmanrq@users.noreply.github.com>

Author: newtonapple

.circleci/continue_config.yml

@@ -148,7 +148,7 @@ jobs:
           command: ./.circleci/test_migration.sh sushi "--gateway duckdb_persistent"
       - run:
           name: Run the migration test - sushi_dbt
-          command: ./.circleci/test_migration.sh sushi_dbt "--config migration_test_config"          
+          command: ./.circleci/test_migration.sh sushi_dbt "--config migration_test_config"
 
   ui_style:
     docker:
@@ -300,23 +300,23 @@ workflows:
           name: cloud_engine_<< matrix.engine >>
           context:
             - sqlmesh_cloud_database_integration
-          requires:
-            - engine_tests_docker
+          # requires:
+          #   - engine_tests_docker
           matrix:
             parameters:
               engine:
-                - snowflake
-                - databricks
-                - redshift
+                # - snowflake
+                # - databricks
+                # - redshift
                 - bigquery
-                - clickhouse-cloud
-                - athena
-                - fabric
-                - gcp-postgres
-          filters:
-            branches:
-              only:
-                - main
+                # - clickhouse-cloud
+                # - athena
+                # - fabric
+                # - gcp-postgres
+          # filters:
+          #   branches:
+          #     only:
+          #       - main
       - ui_style
       - ui_test
       - vscode_test

sqlmesh/core/engine_adapter/bigquery.py

@@ -10,6 +10,7 @@
 from sqlmesh.core.dialect import to_schema
 from sqlmesh.core.engine_adapter.mixins import (
     ClusteredByMixin,
+    GrantsFromInfoSchemaMixin,
     RowDiffMixin,
     TableAlterClusterByOperation,
 )
@@ -39,7 +40,7 @@
     from google.cloud.bigquery.table import Table as BigQueryTable
 
     from sqlmesh.core._typing import SchemaName, SessionProperties, TableName
-    from sqlmesh.core.engine_adapter._typing import BigframeSession, DF, Query
+    from sqlmesh.core.engine_adapter._typing import BigframeSession, DCL, DF, GrantsConfig, Query
     from sqlmesh.core.engine_adapter.base import QueryOrDF
 
 
@@ -54,7 +55,7 @@
 
 
 @set_catalog()
-class BigQueryEngineAdapter(ClusteredByMixin, RowDiffMixin):
+class BigQueryEngineAdapter(ClusteredByMixin, RowDiffMixin, GrantsFromInfoSchemaMixin):
     """
     BigQuery Engine Adapter using the `google-cloud-bigquery` library's DB API.
     """
@@ -64,6 +65,11 @@ class BigQueryEngineAdapter(ClusteredByMixin, RowDiffMixin):
     SUPPORTS_TRANSACTIONS = False
     SUPPORTS_MATERIALIZED_VIEWS = True
     SUPPORTS_CLONING = True
+    SUPPORTS_GRANTS = True
+    CURRENT_USER_OR_ROLE_EXPRESSION: exp.Expression = exp.func("session_user")
+    SUPPORTS_MULTIPLE_GRANT_PRINCIPALS = True
+    USE_CATALOG_IN_GRANTS = True
+    GRANT_INFORMATION_SCHEMA_TABLE_NAME = "OBJECT_PRIVILEGES"
     MAX_TABLE_COMMENT_LENGTH = 1024
     MAX_COLUMN_COMMENT_LENGTH = 1024
     SUPPORTS_QUERY_EXECUTION_TRACKING = True
@@ -1319,6 +1325,103 @@ def _session_id(self) -> t.Any:
     def _session_id(self, value: t.Any) -> None:
         self._connection_pool.set_attribute("session_id", value)
 
+    def _get_current_schema(self) -> str:
+        raise NotImplementedError("BigQuery does not support current schema")
+
+    def _get_bq_dataset_location(self, project: str, dataset: str) -> str:
+        return self._db_call(self.client.get_dataset, dataset_ref=f"{project}.{dataset}").location
+
+    def _get_grant_expression(self, table: exp.Table) -> exp.Expression:
+        if not table.db:
+            raise ValueError(
+                f"Table {table.sql(dialect=self.dialect)} does not have a schema (dataset)"
+            )
+        project = table.catalog or self.get_current_catalog()
+        if not project:
+            raise ValueError(
+                f"Table {table.sql(dialect=self.dialect)} does not have a catalog (project)"
+            )
+
+        dataset = table.db
+        table_name = table.name
+        location = self._get_bq_dataset_location(project, dataset)
+
+        # https://cloud.google.com/bigquery/docs/information-schema-object-privileges
+        # OBJECT_PRIVILEGES is a project-level INFORMATION_SCHEMA view with regional qualifier
+        object_privileges_table = exp.to_table(
+            f"`{project}`.`region-{location}`.INFORMATION_SCHEMA.{self.GRANT_INFORMATION_SCHEMA_TABLE_NAME}",
+            dialect=self.dialect,
+        )
+        return (
+            exp.select("privilege_type", "grantee")
+            .from_(object_privileges_table)
+            .where(
+                exp.and_(
+                    exp.column("object_schema").eq(exp.Literal.string(dataset)),
+                    exp.column("object_name").eq(exp.Literal.string(table_name)),
+                    # Filter out current_user
+                    # BigQuery grantees format: "user:email" or "group:name"
+                    exp.func("split", exp.column("grantee"), exp.Literal.string(":"))[
+                        exp.func("OFFSET", exp.Literal.number("1"))
+                    ].neq(self.CURRENT_USER_OR_ROLE_EXPRESSION),
+                )
+            )
+        )
+
+    @staticmethod
+    def _grant_object_kind(table_type: DataObjectType) -> str:
+        if table_type == DataObjectType.VIEW:
+            return "VIEW"
+        return "TABLE"
+
+    def _dcl_grants_config_expr(
+        self,
+        dcl_cmd: t.Type[DCL],
+        table: exp.Table,
+        grant_config: GrantsConfig,
+        table_type: DataObjectType = DataObjectType.TABLE,
+    ) -> t.List[exp.Expression]:
+        expressions: t.List[exp.Expression] = []
+        if not grant_config:
+            return expressions
+
+        # https://cloud.google.com/bigquery/docs/reference/standard-sql/data-control-language
+
+        def normalize_principal(p: str) -> str:
+            if ":" not in p:
+                raise ValueError(f"Principal '{p}' missing a prefix label")
+
+            # allUsers and allAuthenticatedUsers special groups that are cas-sensitive and must start with "specialGroup:"
+            if p.endswith("allUsers") or p.endswith("allAuthenticatedUsers"):
+                if not p.startswith("specialGroup:"):
+                    raise ValueError(
+                        f"Special group principal '{p}' must start with 'specialGroup:' prefix label"
+                    )
+                return p
+
+            label, principal = p.split(":", 1)
+            # always lowercase principals
+            return f"{label}:{principal.lower()}"
+
+        object_kind = self._grant_object_kind(table_type)
+        for privilege, principals in grant_config.items():
+            if not principals:
+                continue
+
+            noramlized_principals = [exp.Literal.string(normalize_principal(p)) for p in principals]
+            args: t.Dict[str, t.Any] = {
+                "privileges": [exp.GrantPrivilege(this=exp.to_identifier(privilege, quoted=True))],
+                "securable": table.copy(),
+                "principals": noramlized_principals,
+            }
+
+            if object_kind:
+                args["kind"] = exp.Var(this=object_kind)
+
+            expressions.append(dcl_cmd(**args))  # type: ignore[arg-type]
+
+        return expressions
+
 
 class _ErrorCounter:
     """

sqlmesh/core/snapshot/evaluator.py

@@ -1723,19 +1723,29 @@ def _apply_grants(
             return
 
         model_grants_target_layer = model.grants_target_layer
+        deployable_vde_dev_only = (
+            is_snapshot_deployable and model.virtual_environment_mode.is_dev_only
+        )
+
+        # table_type is always a VIEW in the virtual layer unless model is deployable and VDE is dev_only
+        # in which case we fall back to the model's model_grants_table_type
+        if target_layer == GrantsTargetLayer.VIRTUAL and not deployable_vde_dev_only:
+            model_grants_table_type = DataObjectType.VIEW
+        else:
+            model_grants_table_type = model.grants_table_type
 
         if (
             model_grants_target_layer.is_all
             or model_grants_target_layer == target_layer
             # Always apply grants in production when VDE is dev_only regardless of target_layer
             # since only physical tables are created in production
-            or (is_snapshot_deployable and model.virtual_environment_mode.is_dev_only)
+            or deployable_vde_dev_only
         ):
             logger.info(f"Applying grants for model {model.name} to table {table_name}")
             self.adapter.sync_grants_config(
                 exp.to_table(table_name, dialect=self.adapter.dialect),
                 grants_config,
-                model.grants_table_type,
+                model_grants_table_type,
             )
         else:
             logger.debug(

tests/core/engine_adapter/integration/__init__.py

@@ -758,6 +758,21 @@ def _get_create_user_or_role(
             # Creating an account-level group in Databricks requires making REST API calls so we are going to
             # use a pre-created group instead. We assume the suffix on the name is the unique id
             return "_".join(username.split("_")[:-1]), None
+        if self.dialect == "bigquery":
+            # BigQuery uses IAM service accounts that need to be pre-created
+            # Pre-created GCP service accounts:
+            # - sqlmesh-test-admin@{project-id}.iam.gserviceaccount.com
+            # - sqlmesh-test-analyst@{project-id}.iam.gserviceaccount.com
+            # - sqlmesh-test-etl-user@{project-id}.iam.gserviceaccount.com
+            # - sqlmesh-test-reader@{project-id}.iam.gserviceaccount.com
+            # - sqlmesh-test-user@{project-id}.iam.gserviceaccount.com
+            # - sqlmesh-test-writer@{project-id}.iam.gserviceaccount.com
+            role_name = (
+                username.replace(f"_{self.test_id}", "").replace("test_", "").replace("_", "-")
+            )
+            project_id = self.engine_adapter.get_current_catalog()
+            service_account = f"sqlmesh-test-{role_name}@{project_id}.iam.gserviceaccount.com"
+            return f"serviceAccount:{service_account}", None
         raise ValueError(f"User creation not supported for dialect: {self.dialect}")
 
     def _create_user_or_role(self, username: str, password: t.Optional[str] = None) -> str:
@@ -791,20 +806,29 @@ def create_users_or_roles(self, *role_names: str) -> t.Iterator[t.Dict[str, str]
             for user_name in created_users:
                 self._cleanup_user_or_role(user_name)
 
+    def get_select_privilege(self) -> str:
+        if self.dialect == "bigquery":
+            return "roles/bigquery.dataViewer"
+        return "SELECT"
+
     def get_insert_privilege(self) -> str:
         if self.dialect == "databricks":
             # This would really be "MODIFY" but for the purposes of having this be unique from UPDATE
             # we return "MANAGE" instead
             return "MANAGE"
+        if self.dialect == "bigquery":
+            return "roles/bigquery.dataEditor"
         return "INSERT"
 
     def get_update_privilege(self) -> str:
         if self.dialect == "databricks":
             return "MODIFY"
+        if self.dialect == "bigquery":
+            return "roles/bigquery.dataOwner"
         return "UPDATE"
 
     def _cleanup_user_or_role(self, user_name: str) -> None:
-        """Helper function to clean up a PostgreSQL user and all their dependencies."""
+        """Helper function to clean up a user/role and all their dependencies."""
         try:
             if self.dialect in ["postgres", "redshift"]:
                 self.engine_adapter.execute(f"""
@@ -816,7 +840,8 @@ def _cleanup_user_or_role(self, user_name: str) -> None:
                 self.engine_adapter.execute(f'DROP USER IF EXISTS "{user_name}"')
             elif self.dialect == "snowflake":
                 self.engine_adapter.execute(f"DROP ROLE IF EXISTS {user_name}")
-            elif self.dialect == "databricks":
+            elif self.dialect in ["databricks", "bigquery"]:
+                # For Databricks and BigQuery, we use pre-created accounts that should not be deleted
                 pass
         except Exception:
             pass