z4j-flask 1.7.0

z4j Flask framework adapter (Apache 2.0)

z4j-flask

The Flask framework adapter for z4j.

Adds the z4j agent into your Flask app via a one-line Z4J(app) initializer. Auto-discovers the engine adapter you have installed (Celery, RQ, Dramatiq, Huey, arq, TaskIQ) and streams every task lifecycle event to z4j. Operator control actions flow back the same channel.

Compatibility

• Flask 3.1.3+ (no upper cap)
• Python 3.11+

Pair with an engine adapter (z4j-celery, z4j-rq, z4j-dramatiq, z4j-huey, z4j-arq, z4j-taskiq); each engine adapter carries its own upstream floor.

Full per-adapter matrix at https://z4j.dev/reference/compatibility/.

What it ships

• One-line install, Z4J(app) and the agent connects on the next worker boot
• Engine auto-discovery, picks up whichever z4j engine adapter is installed alongside; cross-stack combos (Flask + RQ, Flask + Celery) are first-class
• @z4j_meta decorator, optional per-task annotations (priority="critical", description="...") for dashboard filtering and SLO display
• Service-user safe, auto-relocates the local outbound buffer to $TMPDIR/z4j-{uid} when $HOME is unwritable

Install

pip install z4j-flask z4j-celery z4j-celerybeat

Wire it into your app:

from flask import Flask
from z4j_flask import Z4J

app = Flask(__name__)
Z4J(app)  # reads Z4J_TOKEN, Z4J_BRAIN_URL, Z4J_PROJECT_ID from env

Mint the agent token from the dashboard's Agents page.

Reliability

• No exception from the agent ever propagates back into Flask request handlers or your worker code.
• Events buffer locally when z4j is unreachable; your application never blocks on network I/O.

Documentation

Full docs at z4j.dev/frameworks/flask/.

License

Apache-2.0, see LICENSE.

Links

• Homepage: https://z4j.com
• Documentation: https://z4j.dev
• PyPI: https://pypi.org/project/z4j-flask/
• Issues: https://github.com/z4jdev/z4j-flask/issues
• Changelog: CHANGELOG.md
• Security: [e-mail] (see SECURITY.md)