Nirmalya Ghosh ghoshnirmalya

Github : Signing commits using GPG (Ubuntu/Mac) 🔐

Do you have an Github account ? If not create one.
Install required tools
Latest Git Client
gpg tools

# Ubuntu
sudo apt-get install gpa seahorse
# MacOS with https://brew.sh/

Elixir + Phoenix Framework + Guardian + JWT + Comeonin

Preparing environment

We need to generate secret key for development environment.

mix phoenix.gen.secret
# ednkXywWll1d2svDEpbA39R5kfkc9l96j0+u7A8MgKM+pbwbeDsuYB8MP2WUW1hf

Let's generate User model and controller.

Elixir + Phoenix Framework 1.3 + Guardian + JWT(Refresh, Revoke, Recover) + Comeonin

User model bootstrap

Let's generate User model and controller.

mix ecto.create
mix phoenix.gen.json Accounts User users email:string password_hash:string

This API was removed in React 17

Interaction tracing with React

React recently introduced an experimental profiler API. After discussing this API with several teams at Facebook, one common piece of feedback was that the performance information would be more useful if it could be associated with the events that caused the application to render (e.g. button click, XHR response). Tracing these events (or "interactions") would enable more powerful tooling to be built around the timing information, capable of answering questions like "What caused this really slow commit?" or "How long does it typically take for this interaction to update the DOM?".

With version 16.4.3, React added experimental support for this tracing by way of a new NPM package, scheduler. However the public API for this package is not yet finalized and will likely change with upcoming minor releases, so it should be used with caution.

POSTGRESQL CHEATSHEET

Basic commands

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

	function* connectToSocket(url) {
	const socket = new Socket(socketBaseUrl() + url, { params: { token: 'your-auth-token' } });
	socket.connect();
	return socket;
	}

	// channel.join is async, this is probably an error
	function* joinChannel(socket, channel_name) {
	const channel = socket.channel(channel_name, {});
	channel.join();