codesnips
ruby 
require 'sinatra'
require 'json'
require_relative 'book'
require_relative 'helpers'

set :books, {

Sinatra Content Negotiation: Serve HTML or JSON by Accept Header

sinatra rack content-negotiation
by codesnips 4 tabs
rust 
use std::sync::Arc;
use std::time::{Duration, Instant};
use tokio::sync::Mutex;
use tokio::time::sleep;

#[derive(Debug)]

Rate-Limiting Outbound HTTP with a Token Bucket in Rust (Tokio)

rust tokio rate-limiting
by codesnips 3 tabs
javascript 
const jwt = require('jsonwebtoken');

const SECRET = process.env.JWT_SECRET;
const ALGORITHM = 'HS256';
const ACCESS_TTL = '15m';

JWT Authentication Middleware in Express That Populates req.user

express jwt authentication
by codesnips 3 tabs
typescript 
import { AsyncLocalStorage } from 'node:async_hooks';

interface Store {
  requestId: string;
}

Propagate a Request ID Through NestJS Logs with AsyncLocalStorage

nestjs logging middleware
by codesnips 4 tabs
java 
import jakarta.persistence.*;
import java.math.BigDecimal;
import java.util.Objects;

@Entity
@Table(name = "accounts")

Optimistic Locking with JPA @Version and Retry on Concurrent Updates

jpa hibernate spring
by codesnips 3 tabs
python 
import errno
import fcntl
import os
import time

File-Based Locking to Prevent Concurrent Cron Job Runs in Python

locking concurrency fcntl
by codesnips 3 tabs
php 
<?php

namespace App\Models\Scopes;

use App\Support\TenantContext;
use Illuminate\Database\Eloquent\Builder;

Automatic Multi-Tenant Scoping in Laravel with a Global Scope and Auth Context

laravel multi-tenancy eloquent
by codesnips 4 tabs
ruby 
module Notifications
  class RecipientSerializer < ActiveJob::Serializers::ObjectSerializer
    def serialize?(argument)
      argument.is_a?(Notifications::Recipient)
    end

Enqueuing Notification Batches with a Custom Active Job Argument Serializer for Value Objects

rails active-job serialization
by codesnips 4 tabs
typescript 
import { useEffect, useRef } from "react";

const FOCUSABLE = [
  "a[href]",
  "button:not([disabled])",
  "textarea:not([disabled])",

Trap Keyboard Focus in a Modal with a useFocusTrap React Hook

react hooks accessibility
by codesnips 3 tabs
ruby 
class ImportRun < ApplicationRecord
  enum status: { pending: 0, running: 1, completed: 2, failed: 3 }

  def percent
    return 0 if total.to_i.zero?
    [(processed.to_f / total * 100).round, 100].min

Live Turbo Streams Progress Bar for a Long Rails Job

rails turbo-streams hotwire
by codesnips 4 tabs
go 
package httpretry

import (
	"math/rand"
	"time"
)

Exponential Backoff With Full Jitter for Flaky HTTP Calls in Go

go http retry
by codesnips 3 tabs
python 
import sqlite3

import click
from flask import current_app, g

Request-Scoped Database Connections in Flask Using g and teardown_appcontext

flask sqlite connection-pooling
by codesnips 4 tabs