89bf87cb62
- Update sql_connect to refresh global db object via reconnect_db - Add returns_rows check and safe fetch block in sql_select - Prevents 500 errors during transient database connection issues
88 lines
2.7 KiB
Python
88 lines
2.7 KiB
Python
"""
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Foundational SQL connection management for the Aether API.
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Isolates the SQLAlchemy engine and global connection state to prevent circular imports.
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"""
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import logging
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import threading
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from typing import Any, Optional
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from sqlalchemy import create_engine
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from app.config import settings
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log = logging.getLogger('root')
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# 1. Thread-local storage for capturing last SQL error message
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_sql_error_state = threading.local()
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def get_last_sql_error() -> Optional[str]:
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"""Retrieves and clears the last captured SQL error message."""
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error = getattr(_sql_error_state, 'last_error', None)
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_sql_error_state.last_error = None
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return error
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def set_last_sql_error(error: Any):
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"""Sets the last captured SQL error message."""
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_sql_error_state.last_error = str(error)
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# 2. Initial Engine Setup
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db_uri = settings.SQLALCHEMY_DB_URI
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engine = create_engine(
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url = db_uri,
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echo = False,
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pool_use_lifo = True,
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pool_pre_ping = True,
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pool_recycle = settings.DB['pool_recycle'],
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isolation_level = 'READ COMMITTED',
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connect_args = {'connect_timeout': settings.DB['connect_timeout']}
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)
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log.info('DB SQL Core: Initializing connection...')
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db = None
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try:
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db = engine.connect()
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log.info(f'DB SQL Core: Connected to database: {db_uri}')
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except Exception:
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log.exception('DB SQL Core: Could not connect to database.')
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# 3. Connection Management Logic
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def reconnect_db() -> bool:
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"""
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Re-initializes the global database engine and connection using current settings.
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Useful after bootstrapping new credentials from the 'cfg' table.
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"""
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global engine, db, db_uri
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log.info("DB SQL Core: Refreshing database connection engine...")
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try:
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if engine:
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engine.dispose()
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log.info("DB SQL Core: Disposed of previous database engine.")
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db_uri = settings.SQLALCHEMY_DB_URI
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engine = create_engine(
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url = db_uri,
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echo = False,
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pool_use_lifo = True,
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pool_pre_ping = True,
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pool_recycle = settings.DB['pool_recycle'],
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isolation_level = 'READ COMMITTED',
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connect_args = {'connect_timeout': settings.DB['connect_timeout']}
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)
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db = engine.connect()
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log.info(f"DB SQL Core: Database connection re-established successfully: {db_uri}")
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return True
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except Exception:
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log.exception("DB SQL Core: FAILED to refresh database connection!")
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return False
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def sql_connect(current_db=None, log_lvl: int = logging.INFO) -> bool:
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"""Refreshes the global database connection."""
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log.setLevel(log_lvl)
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log.info('DB SQL Core: Refreshing database connection via sql_connect...')
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return reconnect_db() |