Apoorw Anand apoorvanand

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

	services:
	postiz:
	image: ghcr.io/gitroomhq/postiz-app:latest
	container_name: postiz
	restart: always
	environment:
	# === Required Settings
	MAIN_URL: "https://postiz.your-server.com"
	FRONTEND_URL: "https://postiz.your-server.com"
	NEXT_PUBLIC_BACKEND_URL: "https://postiz.your-server.com/api"

	#!/bin/bash
	set -e

	# ===========================================
	# CONFIGURATION
	# ===========================================
	POSTIZ_DOMAIN="social.thenotary.app"
	GROWCHIEF_DOMAIN="linkedin.thenotary.app"
	POSTIZ_DIR="/opt/postiz"
	GROWCHIEF_DIR="/opt/growchief"

	version: '3'
	services:
	tracecar_db:
	image: postgres:13-alpine
	environment:
	POSTGRES_USER: tracecar
	POSTGRES_PASSWORD: your_password
	POSTGRES_DB: tracecar
	networks:
	- tracecar_network

	import org.springframework.beans.factory.annotation.Value;
	import org.springframework.context.annotation.Bean;
	import org.springframework.context.annotation.Configuration;
	import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
	import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration;
	import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
	import io.lettuce.core.ClientOptions;
	import io.lettuce.core.RedisURI;
	import io.lettuce.core.resource.DefaultClientResources;
	import io.lettuce.core.resource.DefaultEventLoopGroupProvider;

	import org.springframework.beans.factory.annotation.Value;
	import org.springframework.context.annotation.Bean;
	import org.springframework.context.annotation.Configuration;
	import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
	import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration;
	import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
	import io.lettuce.core.ClientOptions;
	import io.lettuce.core.resource.ClientResources;
	import io.lettuce.core.resource.DefaultClientResources;

	package main

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

	func main() {
	topCommand := exec.Command("top","-d 0.5", "-b", "-n 5")

	#!/bin/sh

	# This assumes you have access to the system via SSH already, and need
	# remote VNC access as the same user, and you want only the primary display.
	export DISPLAY=:0

	# Encoded password with http://www.motobit.com/util/base64-decoder-encoder.asp
	export VNC_PASSWORD="dm5jX3Bhc3N3b3JkNzE=" # vnc_password71
	export VNC_PASSWORD="dm5jX3Bhc3M=" # vnc_password (a character limit is enforced?)
	# Sadly many common VNC clients don't support encryption.

	package reverse_proxy

	import (
	"bytes"
	"fmt"
	"github.com/viggin/svc-api-gateway/internal/models"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/palantir/stacktrace"
	"github.com/sirupsen/logrus"

	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;

	import java.io.IOException;
	import java.net.http.HttpClient;
	import java.net.http.HttpRequest;
	import java.net.http.HttpResponse;
	import java.net.http.HttpResponse.BodyHandler;
	import java.time.Duration;
	import java.util.concurrent.CompletableFuture;