Redowan Delowar rednafi

Software Engineer Wolt – Databases & Distributed Systems

rednafi / dataclasses_singledispatch.py

Last active August 6, 2020 04:18

A callable that takes a dataclass object and applies appropriate target-methods based on the types of the attributes

	from dataclasses import dataclass
	from functools import singledispatchmethod
	from typing import List, TypeVar

	T = TypeVar("T")


	class Process:
	@singledispatchmethod
	def _process(self, arg: T) -> None:

rednafi / staticmeta.py

Last active September 9, 2020 10:24

Metaclass to apply staticmethod decorator to all the methods of a class

	from types import FunctionType


	class StaticMeta(type):
	def __new__(cls, name, bases, attrs):
	"""Metaclass to apply staticmethod decorator to all the methods."""

	new_cls = super().__new__(cls, name, bases, attrs)
	# key is attribute name and val is attribute value in the attrs dict
	for key, val in attrs.items():

rednafi / pymysql_ssh.py

Created July 19, 2020 12:01

Pymysql with SSH

	from os.path import expanduser

	import pandas as pd
	import paramiko
	import pymysql
	from paramiko import SSHClient
	from sshtunnel import SSHTunnelForwarder

	home = expanduser("~")
	mypkey = paramiko.RSAKey.from_private_key_file(home + pkeyfilepath)

rednafi / Makefile

Last active December 24, 2024 05:44

Applying Black, Flake8, Isort and typechecking with mypy

	.PHONY: help
	help:
	@grep -E '^[a-zA-Z_-]+:.?## .$$' $(MAKEFILE_LIST) \| sort \| awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'

	.PHONY: venvcheck ## Check if venv is active
	venvcheck:
	ifeq ("$(VIRTUAL_ENV)","")
	@echo "Venv is not activated!"
	@echo "Activate venv first."
	@echo

rednafi / kebase.md

Created July 15, 2020 05:26

I hereby claim:

To claim this, I am signing this object:

rednafi / sqla_dict.py

Last active June 30, 2020 18:03

Python's dict-like custom data structure that can store data in any SQLAlchemy supported database. Uses transaction.

	"""
	This is a self contained custom data structure with dict like
	key-value storage capabilities.

	* Can store the key-value pairs in any sqlalchemy supported db
	* Employs thread safe transactional scope
	* Modular, just change the session_scope to use a different db
	* This example uses sqlite db for demonstration purpose

	The code is inspired by Raymond Hettinger's talk `Build powerful,

rednafi / proxy_pattern_python.py

Last active June 16, 2020 06:55

Using the Proxy design pattern in Python to decouple logging and exception handling from the core logic

	"""
	This can be used as a template to execute Proxy
	design pattern with Python.

	* Get the json response from PostMan API
	url: https://postman-echo.com/get?foo1=bar_1&foo2=bar_2

	* Print the header properties

	* Print the argument properties

rednafi / async_redis.py

Created June 7, 2020 06:37

Seems like aioredis isn't being maintained anymore. This uses redis-py in async mode

	import json
	import os
	import sys
	from datetime import timedelta

	import httpx
	import redis
	from dotenv import load_dotenv
	from fastapi import FastAPI
	from asgiref.sync import sync_to_async

rednafi / calling_async_func.py

Last active June 4, 2020 11:42

Async By Example

	import asyncio
	import time


	async def square_func(n: int) -> int:
	await asyncio.sleep(2)
	print(f"square_func sleeping for 2 seconds")
	return n * n

rednafi / .env

Last active February 3, 2025 21:42

Pedantic config management using Pydantic