watcherr 0.3.0

Lightweight error alerting via Telegram for Python apps. Integrates with FastAPI, Django, Flask, Sanic, Litestar, aiohttp, Celery, Dramatiq, RQ, Huey, APScheduler, and Playwright.

watcherr

Lightweight error alerting via Telegram for Python apps.

Install

pip install watcherr

Optional integrations:

pip install watcherr[fastapi]
pip install watcherr[django]
pip install watcherr[flask]
pip install watcherr[sanic]
pip install watcherr[litestar]
pip install watcherr[aiohttp]
pip install watcherr[celery]
pip install watcherr[dramatiq]
pip install watcherr[rq]
pip install watcherr[huey]
pip install watcherr[apscheduler]
pip install watcherr[playwright]
pip install watcherr[all]

Setup

1. Get chat ID

WATCHERR_BOT_TOKEN=<your-token> watcherr

Send /start to the bot — it will reply with your chat_id.

2. Configure

Via code:

import watcherr

watcherr.configure(
    bot_token="123456:ABC-DEF",
    chat_id="-1001234567890",
    service_name="my-api",
)

Or via .env:

WATCHERR_BOT_TOKEN=123456:ABC-DEF
WATCHERR_CHAT_ID=-1001234567890
WATCHERR_SERVICE_NAME=my-api
WATCHERR_ENVIRONMENT=production

Usage

import watcherr

watcherr.send_alert("Database connection failed", exc=exception)
watcherr.send_warning("Slow query", table="users", duration="5s")
watcherr.send_info("Deployed", version="1.2.0")
watcherr.send_photo("screenshot.png", caption="Login page broken", exc=exception)

Logging handler

import logging
from watcherr.logging_handler import WatcherrHandler

logging.getLogger("myapp").addHandler(WatcherrHandler())

Web Framework Integrations

FastAPI

from watcherr.integrations.fastapi_middleware import WatcherrMiddleware

app.add_middleware(WatcherrMiddleware)

Django

# settings.py
MIDDLEWARE = [
    "watcherr.integrations.django_middleware.WatcherrMiddleware",
    # ... other middleware
]

Flask

from watcherr.integrations.flask import init_app

init_app(app)

Sanic

from watcherr.integrations.sanic_middleware import init_app

init_app(app)

Litestar

from litestar import Litestar
from watcherr.integrations.litestar_middleware import create_exception_handler

app = Litestar(
    exception_handlers={Exception: create_exception_handler()},
)

aiohttp

from aiohttp import web
from watcherr.integrations.aiohttp_middleware import watcherr_middleware

app = web.Application(middlewares=[watcherr_middleware()])

Generic ASGI

from watcherr.integrations.asgi import WatcherrASGIMiddleware

app = WatcherrASGIMiddleware(app)

Generic WSGI

from watcherr.integrations.wsgi import WatcherrWSGIMiddleware

app = WatcherrWSGIMiddleware(app)

Task Queue Integrations

Celery

from watcherr.integrations.celery_signals import setup_celery_alerts

setup_celery_alerts()

Dramatiq

import dramatiq
from watcherr.integrations.dramatiq_middleware import WatcherrMiddleware

dramatiq.get_broker().add_middleware(WatcherrMiddleware())

RQ (Redis Queue)

from rq import Worker
from watcherr.integrations.rq_handler import watcherr_exception_handler

worker = Worker(queues, exception_handlers=[watcherr_exception_handler])

Huey

from huey import RedisHuey
from watcherr.integrations.huey_signals import setup_huey_alerts

huey = RedisHuey("my-app")
setup_huey_alerts(huey)

APScheduler

from apscheduler.schedulers.background import BackgroundScheduler
from watcherr.integrations.apscheduler_listener import setup_apscheduler_alerts

scheduler = BackgroundScheduler()
setup_apscheduler_alerts(scheduler)

Playwright Integration

Context manager (sync)

from watcherr.integrations.playwright import WatcherrPlaywright

with WatcherrPlaywright(page, name="login-test"):
    page.goto("https://example.com")
    page.click("#submit")
# On exception: screenshot + alert sent to Telegram

Context manager (async)

from watcherr.integrations.playwright import AsyncWatcherrPlaywright

async with AsyncWatcherrPlaywright(page, name="checkout-flow"):
    await page.goto("https://example.com/checkout")
    await page.click("#pay")

Pytest plugin

# conftest.py
pytest_plugins = ["watcherr.integrations.playwright_pytest"]

# Failed tests with a `page` fixture automatically send screenshot + alert

Config options

Env variable	Default	Description
WATCHERR_BOT_TOKEN	—	Telegram bot token
WATCHERR_CHAT_ID	—	Telegram chat/group ID
WATCHERR_SERVICE_NAME	app	Service name in alert title
WATCHERR_ENVIRONMENT	production	Environment label
WATCHERR_RATE_LIMIT	60	Dedup window in seconds
WATCHERR_ENABLED	true	Enable/disable sending