culttm

package main

import (
	"fmt"
	"log/slog"
	"os/exec"
)

func main() {
	imagePath := "metro_scan.jpg"

culttm

/*** function that used as middleware ***/

  accessToken: async (name) => {
    if (typeof document === "undefined") return "";
    let token = document.cookie
      .split(";")
      .filter((cookie) => cookie.startsWith("token"))[0];

    if (!token) {
      const response = await fetch("/api/refresh", { method: "POST" });

culttm

type PathImpl<T, K extends keyof T> =
  K extends string
  ? T[K] extends Record<string, any>
    ? T[K] extends ArrayLike<any>
      ? K | `${K}.${PathImpl<T[K], Exclude<keyof T[K], keyof any[]>>}`
      : K | `${K}.${PathImpl<T[K], keyof T[K]>}`
    : K
  : never;

type Path<T> = PathImpl<T, keyof T> | keyof T;

culttm

INTRO

Concurrency is a domain I have wanted to explore for a long time because the locks and the race conditions have always intimidated me. I recall somebody suggesting concurrency patterns in golang because they said "you share the data and not the variables".

Amused by that, I searched for "concurrency in golang" and bumped into this awesome slide by Rob Pike: https://talks.golang.org/2012/waza.slide#1 which does a great job of explaining channels, concurrency patterns and a mini-architecture of load-balancer (also explains the above one-liner).

Let's dig in:

Goroutines

culttm

// app/modules/authentication/authentication.controller.ts

import { Body, Controller, Post } from '@nestjs/common'

import { RegisterRequest } from './requests'

import { User } from '../../modules/user'

import { UsersService } from '../users/users.service'

culttm

map $sent_http_content_type $expires {
    "text/html" epoch;
    "text/html; charset=utf-8"  epoch;
    default off;
}

map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

culttm

#!/bin/bash

set -euo pipefail

openssl req -new -text -passout pass:abcd -subj /CN=localhost -out server.req -keyout privkey.pem
openssl rsa -in privkey.pem -passin pass:abcd -out server.key
openssl req -x509 -in server.req -text -key server.key -out server.crt
chmod 600 server.key
test $(uname -s) = Linux && chown 70 server.key
docker run -d --name postgres -e POSTGRES_HOST_AUTH_METHOD=trust -v "$(pwd)/server.crt:/var/lib/postgresql/server.crt:ro" -v "$(pwd)/server.key:/var/lib/postgresql/server.key:ro" postgres:12-alpine -c ssl=on -c ssl_cert_file=/var/lib/postgresql/server.crt -c ssl_key_file=/var/lib/postgresql/server.key

culttm

version: '3.6'
services:
  postgres:
    image: postgres:12
    restart: always
    ports:
      - "5432:5432"
    volumes:
      - ./db_data:/var/lib/postgresql/data
    environment:

culttm

let isRefreshing = false;
let refreshSubscribers = [];

const instance = axios.create({
  baseURL: Config.API_URL,
});

instance.interceptors.response.use(response => {
  return response;
}, error => {

culttm

const cookie = name => `; ${document.cookie}`.split(`; ${name}=`).pop().split(';').shift();