Mahrez BenHamad MahrezBH

Fundamental of Backend Communications and Protocol

Design Patterns

Request - Response

Client sends a request, then server parses and then processes the request, finally send a response to the client, which parses it and consumes.

Where it is used?

Web, HTTP, DNS. SSH
RPC (Remote Procedure Call)

How to Fix the Error: There isn’t anything to compare. main and development are entirely different commit histories.

Definitions

'main' out of date
'development' up to date
'issue' Unable to create PR from 'development' onto 'main' due to the following error: There isn’t anything to compare. main and development are entirely different commit histories.

Assumptions

Fair understanding of Git

Heroku CLI

Reference: https://devcenter.heroku.com/articles/heroku-cli-commands

1. Login/Logout

Login/Logout to/from Heroku from your Terminal shell

See also:

Service	Type	Storage	Limitations
Amazon DynamoDB	⚠️ Proprietary NoSQL	25 GB	⚠️ Payment method required
Amazon RDS	⚠️ Proprietary RDBMS		⚠️ Only free for 1 year
Azure SQL Database	MS SQL Server		⚠️ Only free for 1 year
👉 Clever Cloud	PostgreSQL, MySQL, MongoDB, Redis	256 MB (PostgreSQL)	Max 5 connections (PostgreSQL)

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

General rules

Follow standard conventions.
Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
Boy scout rule. Leave the campground cleaner than you found it.
Always find root cause. Always look for the root cause of a problem.

Design rules

Install Terminator (shell)

sudo add-apt-repository ppa:gnome-terminator
sudo apt-get update
sudo apt-get install terminator

Terminator should be setup as default now. Restart your terminal (shortcut: "Ctrl+Alt+T").

	Install ERPNext V13, FRAPPE-BENCH 13 on Ubuntu 20.04 and configure for production Environment


	# Install GIT
	$ apt install -y git

	# Ubuntu update and upgrade packages
	$ apt update -y && apt upgrade -y

	# Install Python 3.8 and dependencies

	# see rkengler.com for related blog post
	# https://www.rkengler.com/how-to-capture-network-traffic-when-scraping-with-selenium-and-python/

	import json
	import pprint

	from selenium import webdriver
	from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

	capabilities = DesiredCapabilities.CHROME

	sudo apt update
	sudo apt install firefox python3-pip xvfb x11-utils --yes
	sudo -H pip3 install bpython selenium

	export DISPLAY=:2
	Xvfb $DISPLAY -ac &

	export GECKO_DRIVER_VERSION='v0.24.0'
	wget https://github.com/mozilla/geckodriver/releases/download/$GECKO_DRIVER_VERSION/geckodriver-$GECKO_DRIVER_VERSION-linux64.tar.gz
	tar -xvzf geckodriver-$GECKO_DRIVER_VERSION-linux64.tar.gz

	# -- coding: utf-8 --
	import logging
	import os
	import datetime
	import time


	class SingletonType(type):
	_instances = {}