Flask-DBPacemaker 1.2.8

Hook db connection when you're running a long term sleep crawler assignment.

Flask Database Pacemaker

python_requires>=3.6
Flask>=1.0.2
Flask-APScheduler>=1.11.0
Flask-SQLAlchemy>=2.3.2

- Log

#	date	version
1	2020/12/03	v1.2.3
2	2020/12/03	v1.2.4
3	2020/12/05	v1.2.5
4	2020/12/07	v1.2.7

v1.2.3

• Fixed AttributeError: 'NoneType' object has no attribute 'items' issue due to mysql connection has been terminated.

v1.2.4

• Handle sqlalchemy.exc.ProgrammingError, the problem cause by some specific ORM models not exist in current database.
• Handle database not found issue.
• Raise error if MODELS_PATH_LIST has not been set properly.

v1.2.5

• Replace new line of the error raise from sqlalchemy.
• Change datetime format method.
• Make the code efficient.

v1.2.7

• Add validation, testing awake() before assign the job to APScheduler.

- How to use

1. Add setting into config.py

• DB_PACEMAKER_SWITCH is required
• MODELS_PATH_LIST is required
• POKE_DB_INTERVAL default: 1 hour.

# for DBPacemaker - 透過定時排程請求DB，保持連線
DB_PACEMAKER_SWITCH = True if os.environ['ENVIRONMENT'] == 'develop' else False
MODELS_PATH_LIST = ['spyder_common.models']
POKE_DB_INTERVAL = 60 * 60

2. Establish in app.py

Note: Append this after you declared config and app

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_dbpacemaker import DBPacemaker  # import package
from config import Config

app = Flask(__name__)
config = Config()
app.config.from_object(config)

db = SQLAlchemy(app)

DBPacemaker.run(app, db=db, config=config)  # setup here

• If you've set a scheduler

DBPacemaker.run(app, db=db, config=config, secheduler=your_flask_apscheduler)

Note: The job permanent trigger is interval.

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