Kim Fom kimfom01

Goal

Postman is a usefull app to build and test APIs, most commonly installed on ubuntu-like systems via snap. On recent distributions of Linux Mint (20 and above), snap installs are no longer possible. The instructions below show how to install Postman via the terminal.

Download Postman

$ wget https://dl.pstmn.io/download/latest/linux64 -O postman.tar.gz

Extract archive

$ sudo tar -xzf postman.tar.gz -C /opt

Make symlink

Since Chrome apps are now being deprecated. Download postman from https://dl.pstmn.io/download/latest/linux

Although I highly recommend using a snap

sudo snap install postman

Installing Postman

tar -xzf Postman-linux-x64-5.3.2.tar.gz

BNF parsing

Toy weekend project: make a parser-parser!

This takes in a grammar given in Bakus-Naur Form (BNF), and a program that was written in the provided grammar, and produces an image of Syntax Tree using graphviz.

References:

	root = true

	# C# files
	[*.cs]

	#### Core EditorConfig Options ####

	# Indentation and spacing
	indent_size = 4
	indent_style = space

	//program.cs

	var app = builder.Build();
	var scope = app.Services.CreateScope();
	await DataHelper.ManageDataAsync(scope.ServiceProvider);

	public static class ConnectionHelper
	{
	public static string GetConnectionString(IConfiguration configuration)
	{
	var connectionString = configuration.GetConnectionString("DefaultConnection");
	var databaseUrl = Environment.GetEnvironmentVariable("DATABASE_URL");
	return string.IsNullOrEmpty(databaseUrl) ? connectionString : BuildConnectionString(databaseUrl);
	}

	//build the connection string from the environment. i.e. Heroku

	public static class DataHelper
	{

	public static async Task ManageDataAsync(IServiceProvider svcProvider)
	{
	//Service: An instance of db context
	var dbContextSvc = svcProvider.GetRequiredService<ApplicationDbContext>();

	//Migration: This is the programmatic equivalent to Update-Database
	await dbContextSvc.Database.MigrateAsync();