115 lines
2.1 KiB
Go
115 lines
2.1 KiB
Go
package tb
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import (
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"io"
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"log"
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"net"
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"strconv"
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"testing"
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"time"
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)
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func TestThrottler_Bucket(t *testing.T) {
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t.Parallel()
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th := NewThrottler(0)
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defer th.Close()
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b := th.Bucket("a", 1000)
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ex := [...]int64{100, 100, 1000, 900, 1, 0}
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for i := 0; i < len(ex)-1; i += 2 {
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if got, want := b.Take(ex[i]), ex[i+1]; got != want {
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t.Errorf("Want: %d, Got: %d", want, got)
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}
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}
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for i := 0; i < len(ex)-1; i += 2 {
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if got, want := b.Put(ex[i]), ex[i+1]; got != want {
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t.Errorf("Want: %d, Got: %d", want, got)
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}
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}
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}
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func TestThrottler_Halt(t *testing.T) {
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t.Parallel()
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th := NewThrottler(0)
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defer th.Close()
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if th.Halt("a", 1000, 1000) {
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t.Fatal("Didn't expect halt")
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}
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if !th.Halt("a", 1, 1000) {
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t.Fatal("Expected halt")
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}
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if th.Halt("b", 1000, 1000) {
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t.Fatal("Didn't expect halt")
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}
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}
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func TestThrottler_Wait(t *testing.T) {
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t.Parallel()
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th := NewThrottler(1 * time.Millisecond)
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defer th.Close()
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if wait := th.Wait("a", 1000, 1000); wait > 0 {
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t.Fatal("Didn't expect wait")
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}
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if wait := th.Wait("a", 2000, 1000); int(wait.Seconds()) != 2 {
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t.Fatalf("Expected wait of 2s. Got: %s", wait)
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}
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}
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func BenchmarkThrottler_Bucket(b *testing.B) {
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keys := make([]string, 10000)
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for i := 0; i < len(keys); i++ {
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keys[i] = strconv.Itoa(i)
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}
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th := NewThrottler(1 * time.Millisecond)
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defer th.Close()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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th.Bucket(keys[i%(len(keys)-1)], 1000)
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}
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}
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func ExampleThrottler() {
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ln, err := net.Listen("tcp", ":6789")
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if err != nil {
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log.Fatal(err)
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}
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th := NewThrottler(100 * time.Millisecond)
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defer th.Close()
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echo := func(conn net.Conn) {
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defer conn.Close()
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host, port, err := net.SplitHostPort(conn.RemoteAddr().String())
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if err != nil {
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panic(err)
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}
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// Throttle to 10 connection per second from the same host
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// Handle non-conformity by dropping the connection
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if th.Halt(host, 1, 10) {
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log.Printf("Throttled %s", host)
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return
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}
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log.Printf("Echoing payload from %s:%s", host, port)
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io.Copy(conn, conn)
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}
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for {
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conn, err := ln.Accept()
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if err != nil {
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log.Fatal(err)
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}
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go echo(conn)
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}
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}
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