luhn

# Mount the data disk
# Adapted from https://gist.github.com/ctompkinson/30f570882af38879b36fc7bffe3d1a60
device=/dev/sdh
mount_point=/monitor-config
apt-get install -y nvme-cli
while [ true ]; do
	for blkdev in $(nvme list | awk '/^\/dev/ { print $1 }'); do
		mapping=$(nvme id-ctrl --raw-binary "${blkdev}" | cut -c3073-3104 | tr -s ' ' | sed 's/ $//g')
		if [ ${mapping} = ${device} ]; then
			echo "Found $device on $blkdev"

luhn

import timeit
from abc import ABC, abstractmethod


class A(ABC):
    @abstractmethod
    def a(self):
        ...

luhn

import json
from dataclasses import dataclass, is_dataclass, asdict


class DataclassEncoder(json.JSONEncoder):
    def default(self, obj):
        if is_dataclass(obj):
            return asdict(obj)
        return super().default(obj)

luhn

Celery SQS bug

1. Install dependencies with pip install -r requirements.txt
2. Fill up the queue by running python tasks.py 500
3. Start Celery with celery -A tasks worker --loglevel=INFO -c 3
4. Disconnect computer from internet until you receive a CANCEL_TASKS_BY_DEFAULT warning. This may take a couple minutes and you'll see several errors, but you have to wait until the warning.
5. Reconnect to the internet. After a couple seconds, Celery will reconnect and tasks will start flowing again.
6. Let tasks run for about a minute. You'll notice a slight slowdown and then suddenly tasks will stop entirely for a couple minutes, before resuming again.