112 lines
2.2 KiB
Go
112 lines
2.2 KiB
Go
package udp
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import (
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"crypto/rand"
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"net"
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"runtime"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestProxy_ServeUDP(t *testing.T) {
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backendAddr := ":8081"
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go newServer(t, backendAddr, HandlerFunc(func(conn *Conn) {
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for {
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b := make([]byte, 1024*1024)
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n, err := conn.Read(b)
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require.NoError(t, err)
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_, err = conn.Write(b[:n])
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require.NoError(t, err)
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}
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}))
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proxy, err := NewProxy(backendAddr)
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require.NoError(t, err)
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proxyAddr := ":8080"
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go newServer(t, proxyAddr, proxy)
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time.Sleep(time.Second)
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udpConn, err := net.Dial("udp", proxyAddr)
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require.NoError(t, err)
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_, err = udpConn.Write([]byte("DATAWRITE"))
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require.NoError(t, err)
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b := make([]byte, 1024*1024)
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n, err := udpConn.Read(b)
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require.NoError(t, err)
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assert.Equal(t, "DATAWRITE", string(b[:n]))
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}
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func TestProxy_ServeUDP_MaxDataSize(t *testing.T) {
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if runtime.GOOS == "darwin" {
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// sudo sysctl -w net.inet.udp.maxdgram=65507
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t.Skip("Skip test on darwin as the maximum dgram size is set to 9216 bytes by default")
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}
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// Theoretical maximum size of data in a UDP datagram.
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// 65535 − 8 (UDP header) − 20 (IP header).
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dataSize := 65507
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backendAddr := ":8083"
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go newServer(t, backendAddr, HandlerFunc(func(conn *Conn) {
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buffer := make([]byte, dataSize)
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n, err := conn.Read(buffer)
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require.NoError(t, err)
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_, err = conn.Write(buffer[:n])
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require.NoError(t, err)
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}))
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proxy, err := NewProxy(backendAddr)
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require.NoError(t, err)
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proxyAddr := ":8082"
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go newServer(t, proxyAddr, proxy)
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time.Sleep(time.Second)
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udpConn, err := net.Dial("udp", proxyAddr)
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require.NoError(t, err)
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want := make([]byte, dataSize)
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_, err = rand.Read(want)
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require.NoError(t, err)
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_, err = udpConn.Write(want)
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require.NoError(t, err)
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got := make([]byte, dataSize)
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_, err = udpConn.Read(got)
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require.NoError(t, err)
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assert.Equal(t, want, got)
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}
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func newServer(t *testing.T, addr string, handler Handler) {
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t.Helper()
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addrL, err := net.ResolveUDPAddr("udp", addr)
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require.NoError(t, err)
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listener, err := Listen("udp", addrL, 3*time.Second)
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require.NoError(t, err)
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for {
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conn, err := listener.Accept()
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require.NoError(t, err)
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go handler.ServeUDP(conn)
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}
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}
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