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vendor/github.com/tsenart/tb/examples/echo.go

@@ -0,0 +1,42 @@
+package examples
+
+import (
+	"github.com/tsenart/tb"
+	"io"
+	"log"
+	"net"
+	"time"
+)
+
+func main() {
+	ln, err := net.Listen("tcp", ":6789")
+	if err != nil {
+		log.Fatal(err)
+	}
+	th := tb.NewThrottler(100 * time.Millisecond)
+
+	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)
+	}
+}