46 lines
1.5 KiB
Python
46 lines
1.5 KiB
Python
"""Direct PostgreSQL implementation of the DWH port."""
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from tht.config import DatabaseConfig
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from sqlalchemy.exc import SQLAlchemyError
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from tht.db import execute, sampling
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from tht.db.connection import make_engine, ping
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from tht.db.introspect import introspect
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from tht.execute import ExecResult, PlanSummary
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from tht.mschema.models import PhysicalSchema
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from tht.ports.dwh import DistinctValues, DwhCapabilities, DwhHealth
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class PostgresDwhAdapter:
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capabilities = DwhCapabilities()
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def __init__(self, config: DatabaseConfig):
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self._config = config
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self._engine = make_engine(config)
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def health(self) -> DwhHealth:
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try:
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ping(self._engine)
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except SQLAlchemyError as exc:
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return DwhHealth(ok=False, detail=str(exc))
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return DwhHealth(ok=True)
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def introspect(self) -> PhysicalSchema:
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return introspect(self._engine, self._config.database, self._config.db_schema)
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def run_query(self, sql: str, *, limit: int) -> ExecResult:
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return execute.run_query(self._engine, sql, limit=limit)
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def explain(self, sql: str) -> PlanSummary:
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return execute.explain(self._engine, sql)
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def sample_column(self, table: str, column: str, *, limit: int) -> list[object]:
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return sampling.sample_column(
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self._engine, self._config.db_schema, table, column, limit=limit
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)
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def distinct_values(self, table: str, column: str) -> DistinctValues:
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return sampling.distinct_values(
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self._engine, self._config.db_schema, table, column
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)
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