first code/readme/license commit

misc/tests/multicast.go

@@ -0,0 +1,49 @@
+package main
+
+import "fmt"
+import "net"
+import "time"
+
+// TODO look into netmap + libpcap to bypass the kernel as much as possible
+
+func basic_test() {
+
+  // TODO need a way to look up who our link-local neighbors are for each iface!
+  //addr, err := net.ResolveUDPAddr("udp", "[ff02::1%veth0]:9001")
+  addr, err := net.ResolveUDPAddr("udp", "[ff02::1]:9001")
+  if err != nil { panic(err) }
+  sock, err := net.ListenMulticastUDP("udp", nil, addr)
+  if err != nil { panic(err) }
+  defer sock.Close()
+
+  go func () {
+    saddr, err := net.ResolveUDPAddr("udp", "[::]:0")
+    if err != nil { panic(err) }
+    send, err := net.ListenUDP("udp", saddr)
+    if err != nil { panic(err) }
+    defer send.Close()
+    msg := make([]byte, 1280)
+    for {
+      //fmt.Println("Sending...")
+      send.WriteTo(msg, addr)
+    }
+  }()
+
+  numPackets := 1000
+  start := time.Now()
+  msg := make([]byte, 2000)
+  for i := 0 ; i < numPackets ; i++ {
+    //fmt.Println("Reading:", i)
+    sock.ReadFromUDP(msg)
+  }
+  timed := time.Since(start)
+
+  fmt.Printf("%f packets per second\n", float64(numPackets)/timed.Seconds())
+
+}
+
+func main () {
+
+  basic_test()
+
+}