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package udp_test | |
import ( | |
"crypto/rand" | |
"log" | |
"net" | |
"testing" | |
"time" | |
"github.com/stretchr/testify/require" | |
) | |
func TestUDPUnconnectedDualStack(t *testing.T) { | |
conn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0}) | |
require.NoError(t, err) | |
defer conn.Close() | |
done := make(chan struct{}) | |
go func() { | |
defer close(done) | |
b := make([]byte, 1000) | |
n, addr, err := conn.ReadFrom(b) | |
if err != nil { | |
log.Fatal(err) | |
} | |
t.Logf("received %d bytes from %s", n, addr) | |
}() | |
c, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 0}) | |
require.NoError(t, err) | |
defer c.Close() | |
b := make([]byte, 1000) | |
rand.Read(b) | |
t.Logf("sending packet from %s to %s", c.LocalAddr(), conn.LocalAddr()) | |
_, err = c.WriteTo(b, &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: conn.LocalAddr().(*net.UDPAddr).Port}) | |
require.NoError(t, err) | |
select { | |
case <-done: | |
case <-time.After(5 * time.Second): | |
t.Fatal("timeout") | |
} | |
} | |
func TestUDPUnconnectedDualStackWithRetransmission(t *testing.T) { | |
conn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0}) | |
require.NoError(t, err) | |
defer conn.Close() | |
done := make(chan struct{}) | |
go func() { | |
defer close(done) | |
b := make([]byte, 1000) | |
n, addr, err := conn.ReadFrom(b) | |
if err != nil { | |
log.Fatal(err) | |
} | |
t.Logf("received %d bytes from %s", n, addr) | |
}() | |
c, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 0}) | |
require.NoError(t, err) | |
defer c.Close() | |
b := make([]byte, 1000) | |
rand.Read(b) | |
t.Logf("sending packet from %s to %s", c.LocalAddr(), conn.LocalAddr()) | |
_, err = c.WriteTo(b, &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: conn.LocalAddr().(*net.UDPAddr).Port}) | |
require.NoError(t, err) | |
globalTimeout := time.After(5 * time.Second) | |
ticker := time.NewTicker(100 * time.Millisecond) | |
for { | |
select { | |
case <-done: | |
return | |
case <-ticker.C: | |
// send a retransmission | |
_, err = c.WriteTo(b, &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: conn.LocalAddr().(*net.UDPAddr).Port}) | |
require.NoError(t, err) | |
case <-globalTimeout: | |
t.Fatal("timeout") | |
} | |
} | |
} |
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