Vapor Client Rate Limiter
Library for throttling requests to third party APIs to ensure you don’t exceed a rate limit. Designed to be used when your application scales across multiple instances. Requires Postgres as it uses database locks to queue requests across instances.
Usage
Setup in configure.swift
let clientRateLimiterConfig = RateLimiterConfig(maxRequestsPerSecond: 5, timeout: 60)
app.clientRateLimiters.use {
ClientRateLimiter(byteBufferAllocator: $0.allocator, logger: $0.logger, client: $0.client, db: $0.db, config: clientRateLimiterConfig)
}
Add the migrations for storing the data:
app.migrations.add(CreateHostRequestTime())
app.migrations.add(CreateRateLimitedRequest())
You can configure the maximum number of requests per second to send and a timeout for requests if you’re under heavy load. Then, route requests through the clientRateLimiter:
let response = try await req.clientRateLimiter.get("https://www.google.com")
