reqlimit is a tiny Golang middleware you can use to limit the frequency of requests to your server, on a per-IP basis.
package main
import (
"fmt"
"log"
"net/http"
"time"
"github.com/johnathanhowell/reqlimit"
)
func protectedHandler(w http.ResponseWriter, _ *http.Request) {
fmt.Fprintf(w, "you have successfully requested a protected resource!")
}
func main() {
handler := http.HandlerFunc(protectedHandler)
limitedHandler := reqlimit.New(handler, 10, time.Second * 5) // limit the handler to 10 requests every 5 seconds.
log.Fatal(http.ListenAndServe(":8080", limitedHandler) )
}A limited handler is a bit slower and requires a bit more memory than a naked handler. Here's the benchmarks:
BenchmarkLimitedHandler-8 1000000 1703 ns/op 1488 B/op 14 allocs/op
BenchmarkHandler-8 3000000 504 ns/op 656 B/op 6 allocs/op
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