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vendor/github.com/tsenart/tb/throttler_test.go

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