tan-i-ham

Overview

How to document a new codebase

Use this template to document a new codebase.

Business Logic

A place to record any important logic that you come across that is worth documenting.

Landmarks

Refers to the different landmarks of a codebase to help you navigate around. Where are the API methods defined? Where are interactions with the database?

tan-i-ham

mysql-client in Kubernetes to test your connection to mysql server

kubectl run mysql-client --image=mysql:5.7 -it --rm --restart=Never -- /bin/bash

mysql -h mysql-service -uroot -proot_password -e 'SHOW databases;'

OR

mysql -h mysql-service -uroot -proot_password

tan-i-ham

json
[jsoncrack](https://jsoncrack.com/editor)

tan-i-ham

# homebrew, ref: https://docs.brew.sh/Installation#1
mkdir homebrew && curl -L https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C homebrew
eval "$(homebrew/bin/brew shellenv)"
brew update --force --quiet

# sdkman & java
curl -s "https://get.sdkman.io" | bash
source "$HOME/.sdkman/bin/sdkman-init.sh"
sdk install java

tan-i-ham

Below are the Big O performance of common functions of different Java Collections.


List                 | Add  | Remove | Get  | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList            | O(1) |  O(n)  | O(1) |   O(n)   | O(1) | Array
LinkedList           | O(1) |  O(n)  | O(n) |   O(n)   | O(1) | Linked List
CopyOnWriteArrayList | O(n) |  O(n)  | O(1) |   O(n)   | O(1) | Array

tan-i-ham

Just documenting docs, articles, and discussion related to gRPC and load balancing.

https://github.com/grpc/grpc/blob/master/doc/load-balancing.md

Seems gRPC prefers thin client-side load balancing where a client gets a list of connected clients and a load balancing policy from a "load balancer" and then performs client-side load balancing based on the information. However, this could be useful for traditional load banaling approaches in clound deployments.

https://groups.google.com/forum/#!topic/grpc-io/8s7UHY_Q1po

gRPC "works" in AWS. That is, you can run gRPC services on EC2 nodes and have them connect to other nodes, and everything is fine. If you are using AWS for easy access to hardware then all is fine. What doesn't work is ELB (aka CLB), and ALBs. Neither of these support HTTP/2 (h2c) in a way that gRPC needs.

tan-i-ham

Here's an example application that uses the pattern detailed below: https://github.com/tantastik/talent-curator

---

This document is an attempt to describe the first step of a large project structure with flask and some basic modules:

• SQLAlchemy
• WTForms

Please feel free to fix and add your own tips.

tan-i-ham

Cypress.Commands.add('loginOkta', () => {
  const optionsSessionToken = {
    method: 'POST',
    url: Cypress.env('session_token_url'),
    body: {
      username: Cypress.env('username'),
      password: Cypress.env('password'),
      options: {
        warnBeforePasswordExpired: 'true'
      }

tan-i-ham

-- your_table: The table to modify
-- id: The id field/column to reset

SET @num := 0;
UPDATE your_table SET id = @num := (@num+1);
ALTER TABLE your_table AUTO_INCREMENT =1;

tan-i-ham

How to install virtualenv:

Install pip first

sudo apt-get install python3-pip

Then install virtualenv using pip3

sudo pip3 install virtualenv