120 lines
3.2 KiB
Python
120 lines
3.2 KiB
Python
"""
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db.py — Транспортный слой к базе данных (с пулом соединений).
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Пул psycopg2.pool.ThreadedConnectionPool (min=1, max=3).
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Все query/execute забирают соединение из пула и возвращают обратно.
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"""
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import os
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from psycopg2 import pool as _pgpool
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import psycopg2
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_pool = None
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def _get_pool():
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"""Ленивая инициализация пула."""
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global _pool
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if _pool is None:
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_pool = _pgpool.ThreadedConnectionPool(
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minconn=1,
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maxconn=3,
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host=os.getenv("DB_HOST"),
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port=os.getenv("DB_PORT", 5432),
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dbname=os.getenv("DB_NAME"),
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user=os.getenv("DB_USER"),
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password=os.getenv("DB_PASS"),
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sslmode=os.getenv("DB_SSLMODE", "disable"),
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)
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return _pool
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def _pg_connect(dbname):
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"""
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Сырое подключение к ЛЮБОЙ базе (для /test createdb).
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НЕ из пула — для создания БД нужна отдельная сессия.
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"""
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return psycopg2.connect(
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host=os.getenv("DB_HOST"),
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port=os.getenv("DB_PORT", 5432),
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dbname=dbname,
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user=os.getenv("DB_USER"),
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password=os.getenv("DB_PASS"),
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sslmode=os.getenv("DB_SSLMODE", "disable"),
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)
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def connect():
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"""
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Подключение к ЦЕЛЕВОЙ базе из пула.
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Возвращает (connection, None) или (None, error).
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"""
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try:
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return _get_pool().getconn(), None
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except Exception as e:
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return None, str(e)
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def put_conn(conn):
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"""Вернуть соединение в пул."""
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try:
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_get_pool().putconn(conn)
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except Exception:
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pass
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def query(sql_text, params=None):
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"""
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SELECT → (result, None) или (None, error).
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result = {"columns": [...], "rows": [[...], ...]}
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"""
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conn, err = connect()
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if err:
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return None, f"connect: {err}"
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try:
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cur = conn.cursor()
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cur.execute(sql_text, params)
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rows = cur.fetchall()
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cols = [desc[0] for desc in cur.description] if cur.description else []
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cur.close()
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return {"columns": cols, "rows": [list(r) for r in rows]}, None
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except Exception as e:
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return None, str(e)
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finally:
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put_conn(conn)
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def execute(sql_text, params=None):
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"""
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INSERT/UPDATE/DELETE → (rowcount, None) или (None, error).
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"""
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conn, err = connect()
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if err:
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return None, f"connect: {err}"
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try:
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cur = conn.cursor()
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cur.execute(sql_text, params)
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conn.commit()
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rowcount = cur.rowcount
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cur.close()
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return rowcount, None
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except Exception as e:
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try: conn.rollback()
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except: pass
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return None, str(e)
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finally:
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put_conn(conn)
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def query_one(sql_text, params=None):
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"""
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SELECT одной строки → (row_dict, None) или (None, error).
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"""
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result, err = query(sql_text, params)
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if err:
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return None, err
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rows = result["rows"]
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if not rows:
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return None, None
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return dict(zip(result["columns"], rows[0])), None
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