codesnips
java 
package com.example.signup.validation;

import jakarta.validation.Constraint;
import jakarta.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;

Custom @UniqueEmail Bean Validation Constraint in Spring Boot Signup

spring-boot bean-validation jsr380
by codesnips 4 tabs
rust 
use std::fmt;

#[derive(Debug)]
pub enum HashError {
    Backend(String),
    InvalidHash,

Pluggable Password Hasher Trait in Rust with Argon2 and Bcrypt Backends

rust argon2 bcrypt
by codesnips 3 tabs
ruby 
class TypingPresence
  EXPIRE_AFTER = 6 # seconds

  def initialize(room, redis: Redis.current)
    @room = room
    @redis = redis

Broadcast Typing Indicators in Rails Chat with ActionCable and a Redis Presence Tracker

rails actioncable websockets
by codesnips 3 tabs
go 
package worker

import "context"

func (p *Pool) Submit(job Job) error {
	// Reject fast if draining, otherwise enqueue with backpressure.

Graceful Drain of In-Flight Jobs Before Worker Shutdown in Go

go graceful-shutdown concurrency
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
ruby 
class CreateIdempotencyKeys < ActiveRecord::Migration[7.1]
  def change
    create_table :idempotency_keys do |t|
      t.string :key, null: false
      t.string :request_path, null: false
      t.datetime :locked_at

Idempotent Form Submissions in Rails with an Idempotency-Key Column and before_action Guard

rails idempotency postgres
by codesnips 4 tabs
typescript 
import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';

async function bootstrap() {
  // rawBody: true preserves the exact bytes Stripe signed
  const app = await NestFactory.create(AppModule, { rawBody: true });

Verify Stripe Webhook Signatures in a NestJS Guard Before the Handler

nestjs webhooks stripe
by codesnips 4 tabs
java 
package com.shop.orders.events;

import java.math.BigDecimal;
import java.time.Instant;

public final class OrderPlaced {

Publishing and Consuming an OrderPlaced Domain Event with Spring's ApplicationEventPublisher

java spring-boot spring
by codesnips 4 tabs
ruby 
class Cart < ApplicationRecord
  TTL = 30.minutes

  has_many :line_items, dependent: :destroy

  enum status: { active: 0, expired: 1, checked_out: 2 }

Expiring Idle Shopping Carts with a TTL Check and a Sweeper Job in Rails

rails background-jobs sidekiq
by codesnips 3 tabs
python 
import csv


class _LineBuffer:
    def __init__(self):
        self._data = ""

Stream a Large CSV Export in Chunks from a Flask Endpoint

flask streaming csv
by codesnips 3 tabs
typescript 
import type { Redis } from "ioredis";

export interface StoredResponse {
  status: "pending" | "completed";
  fingerprint: string;
  httpStatus?: number;

Idempotent POST Requests in Express with a Redis-Backed Middleware

express redis idempotency
by codesnips 3 tabs
typescript 
export interface Cursor {
  createdAt: string;
  id: string;
}

export function encodeCursor(c: Cursor): string {

Cursor Pagination for a REST List Endpoint with a Typed Fetch Client

typescript express rest
by codesnips 3 tabs