superset/databases/utils.py

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# to you under the Apache License, Version 2.0 (the
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# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
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from typing import Any, Dict, List, Optional

from superset import app
from superset.models.core import Database

custom_password_store = app.config["SQLALCHEMY_CUSTOM_PASSWORD_STORE"]


def get_foreign_keys_metadata(
    database: Database, table_name: str, schema_name: Optional[str]
) -> List[Dict[str, Any]]:
    foreign_keys = database.get_foreign_keys(table_name, schema_name)
    for fk in foreign_keys:
        fk["column_names"] = fk.pop("constrained_columns")
        fk["type"] = "fk"
    return foreign_keys


def get_indexes_metadata(
    database: Database, table_name: str, schema_name: Optional[str]
) -> List[Dict[str, Any]]:
    indexes = database.get_indexes(table_name, schema_name)
    for idx in indexes:
        idx["type"] = "index"
    return indexes


def get_col_type(col: Dict[Any, Any]) -> str:
    try:
        dtype = f"{col['type']}"
    except Exception:  # pylint: disable=broad-except
        # sqla.types.JSON __str__ has a bug, so using __class__.
        dtype = col["type"].__class__.__name__
    return dtype


def get_table_metadata(
    database: Database, table_name: str, schema_name: Optional[str]
) -> Dict[str, Any]:
    """
    Get table metadata information, including type, pk, fks.
    This function raises SQLAlchemyError when a schema is not found.

    :param database: The database model
    :param table_name: Table name
    :param schema_name: schema name
    :return: Dict table metadata ready for API response
    """
    keys = []
    columns = database.get_columns(table_name, schema_name)
    primary_key = database.get_pk_constraint(table_name, schema_name)
    if primary_key and primary_key.get("constrained_columns"):
        primary_key["column_names"] = primary_key.pop("constrained_columns")
        primary_key["type"] = "pk"
        keys += [primary_key]
    foreign_keys = get_foreign_keys_metadata(database, table_name, schema_name)
    indexes = get_indexes_metadata(database, table_name, schema_name)
    keys += foreign_keys + indexes
    payload_columns: List[Dict[str, Any]] = []
    table_comment = database.get_table_comment(table_name, schema_name)
    for col in columns:
        dtype = get_col_type(col)
        payload_columns.append(
            {
                "name": col["name"],
                "type": dtype.split("(")[0] if "(" in dtype else dtype,
                "longType": dtype,
                "keys": [k for k in keys if col["name"] in k["column_names"]],
                "comment": col.get("comment"),
            }
        )
    return {
        "name": table_name,
        "columns": payload_columns,
        "selectStar": database.select_star(
            table_name,
            schema=schema_name,
            show_cols=True,
            indent=True,
            cols=columns,
            latest_partition=True,
        ),
        "primaryKey": primary_key,
        "foreignKeys": foreign_keys,
        "indexes": keys,
        "comment": table_comment,
    }