"""PostgreSQL-specific data dictionary for metadata queries via psycopg."""
from collections.abc import Mapping, Sequence
from typing import TYPE_CHECKING, Any, ClassVar, cast
from mypy_extensions import mypyc_attr
from sqlspec.data_dictionary import (
ColumnMetadata,
DDLResult,
ForeignKeyMetadata,
IndexMetadata,
MetadataCapability,
MetadataCapabilityProfile,
MetadataFidelity,
MetadataResult,
MetadataRisk,
MetadataSource,
MetadataSupport,
ObjectIdentity,
SystemMetadataCapability,
SystemMetadataRequest,
SystemMetadataResult,
TableMetadata,
VersionInfo,
ensure_system_metadata_request,
get_data_dictionary_loader,
system_metadata_gated_result,
unsupported_system_metadata_capability,
)
from sqlspec.data_dictionary.dialects.postgres import resolve_postgres_json_type
from sqlspec.driver import AsyncDataDictionaryBase, SyncDataDictionaryBase
if TYPE_CHECKING:
from sqlspec.adapters.psycopg.driver import PsycopgAsyncDriver, PsycopgSyncDriver
from sqlspec.core import SQL
__all__ = ("PsycopgAsyncDataDictionary", "PsycopgSyncDataDictionary")
_POSTGRES_METADATA_DOMAINS = (
"schemas",
"objects",
"tables",
"columns",
"constraints",
"indexes",
"views",
"materialized_views",
"sequences",
"routines",
"triggers",
"comments",
"privileges",
"dependencies",
"extensions",
"partitions",
"ddl",
"system",
)
_POSTGRES_SUPPORTED_DOMAINS = frozenset(_POSTGRES_METADATA_DOMAINS) - {"system"}
_POSTGRES_SYSTEM_METADATA_QUERIES = {
"settings": "settings",
"statement_history": "pg_stat_statements",
"pg_stat_statements": "pg_stat_statements",
"table_statistics": "table_stats",
"table_stats": "table_stats",
}
def _postgres_metadata_capability(domain: str) -> MetadataCapability:
if domain == "system":
return MetadataCapability(
domain=domain,
support=MetadataSupport.UNSUPPORTED,
fidelity=MetadataFidelity.UNSUPPORTED,
source=MetadataSource.SYSTEM_VIEW,
risks=(MetadataRisk.EXPENSIVE, MetadataRisk.PRIVILEGED),
warnings=("System metadata is opt-in and disabled by default.",),
)
if domain in _POSTGRES_SUPPORTED_DOMAINS:
return MetadataCapability(
domain=domain,
support=MetadataSupport.SUPPORTED,
fidelity=MetadataFidelity.NATIVE,
source=MetadataSource.CATALOG,
)
return MetadataCapability.unsupported(domain)
def _postgres_metadata_profile(adapter: str, domains: Sequence[str] | None) -> MetadataCapabilityProfile:
requested_domains = _POSTGRES_METADATA_DOMAINS if domains is None else tuple(domains)
return MetadataCapabilityProfile(
"postgres",
adapter=adapter,
capabilities=tuple(_postgres_metadata_capability(domain) for domain in requested_domains),
)
def _metadata_result(
domain: str, capability: MetadataCapability, rows: list[Any] | tuple[Any, ...] = ()
) -> MetadataResult:
return MetadataResult(domain, capability=capability, items=tuple(rows), warnings=capability.warnings)
def _row_value(row: object, key: str) -> object | None:
if isinstance(row, Mapping):
return row.get(key)
return getattr(row, key, None)
def _rows_as_mappings(rows: list[Any] | tuple[Any, ...]) -> tuple[Mapping[str, object], ...]:
return tuple(cast("Mapping[str, object]", row) for row in rows if isinstance(row, Mapping))
def _ddl_result_from_rows(
*,
dialect: str,
object_name: str,
object_type: str,
schema: str | None,
rows: list[Any] | tuple[Any, ...],
warnings: tuple[str, ...] = (),
) -> DDLResult:
row = rows[0] if rows else None
resolved_schema = _row_value(row, "schema_name") if row is not None else schema
ddl = _row_value(row, "ddl") if row is not None else None
fidelity = _row_value(row, "fidelity") if row is not None else MetadataFidelity.UNSUPPORTED
row_warning = _row_value(row, "warning") if row is not None else None
result_warnings = warnings + ((str(row_warning),) if row_warning else ())
identity = ObjectIdentity(
name=object_name,
object_type=object_type,
schema=str(resolved_schema) if resolved_schema is not None else None,
dialect=dialect,
source=MetadataSource.CATALOG,
)
if ddl is None:
return DDLResult.unsupported(identity, source=MetadataSource.CATALOG, warnings=result_warnings)
return DDLResult(
identity=identity,
status=MetadataSupport.SUPPORTED,
fidelity=str(fidelity),
source=MetadataSource.CATALOG,
ddl=str(ddl),
warnings=result_warnings,
)
def _postgres_system_metadata_capability(domain: str) -> SystemMetadataCapability:
if domain not in _POSTGRES_SYSTEM_METADATA_QUERIES:
return unsupported_system_metadata_capability(domain)
return SystemMetadataCapability(
domain,
MetadataSupport.SUPPORTED,
fidelity=MetadataFidelity.NATIVE,
source=MetadataSource.SYSTEM_VIEW,
risks=(MetadataRisk.PRIVILEGED, MetadataRisk.REDACTED),
redaction_fields=("query_text", "setting_value", "user_oid"),
)
def _postgres_domain_sql(domain: str, query_name: str) -> "SQL":
query = get_data_dictionary_loader().get_domain_query("postgres", domain, query_name)
if query.sql is None:
msg = f"Missing PostgreSQL data-dictionary query: {domain}/{query_name}"
raise RuntimeError(msg)
return query.sql
@mypyc_attr(allow_interpreted_subclasses=True, native_class=False)
class PsycopgSyncDataDictionary(SyncDataDictionaryBase):
"""PostgreSQL-specific sync data dictionary."""
dialect: ClassVar[str] = "postgres"
def __init__(self) -> None:
super().__init__()