58 lines
2.5 KiB
Python
58 lines
2.5 KiB
Python
# crudkit/integrations/flask.py
|
||
from __future__ import annotations
|
||
from flask import Flask
|
||
from sqlalchemy.orm import scoped_session, sessionmaker
|
||
from ..engines import CRUDKitRuntime
|
||
from ..config import Config
|
||
|
||
def init_app(app: Flask, *, runtime: CRUDKitRuntime | None = None, config: type[Config] | None = None):
|
||
"""
|
||
Initializes CRUDKit for a Flask app. Provides `app.extensions['crudkit']`
|
||
with a runtime (engine + session_factory). Caller manages session lifecycle.
|
||
"""
|
||
runtime = runtime or CRUDKitRuntime(config=config)
|
||
app.extensions.setdefault("crudkit", {})
|
||
app.extensions["crudkit"]["runtime"] = runtime
|
||
|
||
# Build ONE sessionmaker bound to the ONE true engine object
|
||
# so engine id == sessionmaker.bind id, always.
|
||
engine = runtime.engine
|
||
SessionFactory = runtime.session_factory or sessionmaker(bind=engine, **runtime._config.session_kwargs())
|
||
app.extensions["crudkit"]["SessionFactory"] = SessionFactory
|
||
app.extensions["crudkit"]["Session"] = scoped_session(SessionFactory)
|
||
|
||
# Attach pool listeners to the *same* engine the SessionFactory is bound to.
|
||
# Don’t guess. Don’t hope. Inspect.
|
||
try:
|
||
bound_engine = getattr(SessionFactory, "bind", None) or getattr(SessionFactory, "kw", {}).get("bind") or engine
|
||
pool = bound_engine.pool
|
||
|
||
from sqlalchemy import event
|
||
|
||
@event.listens_for(pool, "checkout")
|
||
def _on_checkout(dbapi_conn, conn_record, conn_proxy):
|
||
sz = pool.size()
|
||
chk = pool.checkedout()
|
||
try:
|
||
conns_in_pool = pool.checkedin()
|
||
except Exception:
|
||
conns_in_pool = "?"
|
||
print(f"POOL CHECKOUT: Pool size: {sz} Connections in pool: {conns_in_pool} "
|
||
f"Current Overflow: {pool.overflow()} Current Checked out connections: {chk} "
|
||
f"engine id= {id(bound_engine)}")
|
||
|
||
@event.listens_for(pool, "checkin")
|
||
def _on_checkin(dbapi_conn, conn_record):
|
||
sz = pool.size()
|
||
chk = pool.checkedout()
|
||
try:
|
||
conns_in_pool = pool.checkedin()
|
||
except Exception:
|
||
conns_in_pool = "?"
|
||
print(f"POOL CHECKIN: Pool size: {sz} Connections in pool: {conns_in_pool} "
|
||
f"Current Overflow: {pool.overflow()} Current Checked out connections: {chk} "
|
||
f"engine id= {id(bound_engine)}")
|
||
except Exception as e:
|
||
print(f"[crudkit.init_app] Failed to attach pool listeners: {e}")
|
||
|
||
return runtime
|