Module RateLimit

Limit the requests sent to a Ktor server with a timeout.

• Source code
• Docs

Install

This package is uploaded to MavenCentral and supports JVM and all native targets as well.

repositories {
    mavenCentral()
}

dependencies {
    implementation("app.softwork:ratelimit:LATEST")
}

Usage

Simple install it in your application module or for a specific route.

val storage: Storage = // Storage implementation, required
install(RateLimit(storage = storage)) {
    limit = 1000
    timeout = 1.hours

    host = { call ->
        call.request.local.remoteHost
    }

    alwaysAllow { host ->
        host.startsWith("foo")
    }

    alwaysBlock { host ->
        host.endsWith("bar")
    }

    skip { call ->
        if (call.request.local.uri == "/login") { // alternative: install at this route only
            RateLimit.SkipResult.ExecuteRateLimit
        } else {
            RateLimit.SkipResult.SkipRateLimit
        }
    }
}

Storage

To persist the rate limiting, you need to implement a Storage provider, which use kotlinx.datetime.Instant. All functions are suspend to support async IO operations.

License

Apache 2

Package app.softwork.ratelimit

The package contains the feature RateLimit and the Storage implementation.