codesnips

redis

python 
from django.core.cache import cache


class RateLimiter:
    def __init__(self, scope, limit, window_seconds):
        self.scope = scope

Rate-Limiting Django Password Reset Requests in a Form's clean() Method

django rate-limiting caching
by codesnips 3 tabs
ruby 
class TrendingPostsService
  CACHE_KEY = 'trending_posts:v1'.freeze
  CACHE_TTL = 15.minutes

  def self.call(limit: 10)
    Rails.cache.fetch(CACHE_KEY, expires_in: CACHE_TTL) do

Redis caching for expensive computations

rails redis caching
by Alex Kumar 1 tab
java 
package com.example.demo.config;

import com.github.benmanes.caffeine.cache.Caffeine;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.caffeine.CaffeineCacheManager;

Caching strategies with Spring Cache

java spring-boot caching
by David Kumar 2 tabs
ruby 
class LastSeenTracker
  THROTTLE = 5.minutes
  PENDING_KEY = "pending:last_seen".freeze

  class << self
    def touch(user_id, at: Time.current)

Database “Last Seen” without Hot Row Updates

rails performance redis
by codesnips 3 tabs
php 
<?php

use Illuminate\Support\Facades\Cache;

// Remember pattern - fetch from cache or execute closure
$posts = Cache::remember('posts.all', 3600, function () {

Laravel cache strategies for performance

laravel cache performance
by Carlos Mendez 4 tabs
lua 
-- KEYS[1] = bucket key
-- ARGV[1] = capacity, ARGV[2] = refill_per_sec, ARGV[3] = now (float seconds)
local capacity = tonumber(ARGV[1])
local rate = tonumber(ARGV[2])
local now = tonumber(ARGV[3])

Redis-Backed Token Bucket Rate Limiter as FastAPI Middleware

fastapi redis rate-limiting
by codesnips 4 tabs
ruby 
require "securerandom"

class RedisMutex
  class LockError < StandardError; end

  UNLOCK_SCRIPT = <<~LUA.freeze

Redis-Based Distributed Mutex (with TTL)

rails redis concurrency
by codesnips 2 tabs
go 
package pricecache

import (
	"context"
	"sync"

Collapse Concurrent Identical Requests in Go with singleflight

go singleflight concurrency
by codesnips 3 tabs
ruby 
class PresenceRegistry
  TTL = 30 # seconds a user counts as present without a heartbeat

  def initialize(room_id, redis: REDIS)
    @room_id = room_id
    @redis = redis

Action Cable Presence Tracking (Lightweight)

rails actioncable redis
by codesnips 3 tabs
php 
<?php

namespace App\Jobs;

use App\Models\Invoice;
use App\Services\StripeGateway;

Preventing Double-Charges in Laravel with WithoutOverlapping Job Middleware

laravel queues background-jobs
by codesnips 3 tabs
php 
<?php

declare(strict_types=1);

namespace App\Security;

PHP Login Rate Limiting with a Sliding-Window Throttle Middleware

php rate-limiting middleware
by codesnips 3 tabs
lua 
-- KEYS[1] = bucket key
-- ARGV[1] = capacity, ARGV[2] = refill_rate (tokens/sec)
-- ARGV[3] = now_ms, ARGV[4] = requested tokens
local capacity    = tonumber(ARGV[1])
local refill_rate = tonumber(ARGV[2])
local now_ms      = tonumber(ARGV[3])

Token Bucket Rate Limiting in a Servlet Filter with Redis and Lua

rate-limiting token-bucket servlet
by codesnips 3 tabs