traefik/pkg/server/server_entrypoint_udp_test.go

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package server
import (
"context"
"io"
"net"
"testing"
"time"
"github.com/stretchr/testify/require"
ptypes "github.com/traefik/paerser/types"
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"github.com/traefik/traefik/v3/pkg/config/static"
"github.com/traefik/traefik/v3/pkg/udp"
)
func TestShutdownUDPConn(t *testing.T) {
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ep := static.EntryPoint{
Address: ":0",
Transport: &static.EntryPointsTransport{
LifeCycle: &static.LifeCycle{
GraceTimeOut: ptypes.Duration(5 * time.Second),
},
},
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}
ep.SetDefaults()
entryPoint, err := NewUDPEntryPoint(&ep)
require.NoError(t, err)
go entryPoint.Start(context.Background())
entryPoint.Switch(udp.HandlerFunc(func(conn *udp.Conn) {
for {
b := make([]byte, 1024*1024)
n, err := conn.Read(b)
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if err != nil {
return
}
// We control the termination, otherwise we would block on the Read above,
// until conn is closed by a timeout.
// Which means we would get an error,
// and even though we are in a goroutine and the current test might be over,
// go test would still yell at us if this happens while other tests are still running.
if string(b[:n]) == "CLOSE" {
return
}
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_, _ = conn.Write(b[:n])
}
}))
conn, err := net.Dial("udp", entryPoint.listener.Addr().String())
require.NoError(t, err)
// Start sending packets, to create a "session" with the server.
requireEcho(t, "TEST", conn, time.Second)
doneChan := make(chan struct{})
go func() {
entryPoint.Shutdown(context.Background())
close(doneChan)
}()
// Make sure that our session is still live even after the shutdown.
requireEcho(t, "TEST2", conn, time.Second)
// And make sure that on the other hand, opening new sessions is not possible anymore.
conn2, err := net.Dial("udp", entryPoint.listener.Addr().String())
require.NoError(t, err)
_, err = conn2.Write([]byte("TEST"))
// Packet is accepted, but dropped
require.NoError(t, err)
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// Make sure that our session is yet again still live.
// This is specifically to make sure we don't create a regression in listener's readLoop,
// i.e. that we only terminate the listener's readLoop goroutine by closing its pConn.
requireEcho(t, "TEST3", conn, time.Second)
done := make(chan bool)
go func() {
defer close(done)
b := make([]byte, 1024*1024)
n, err := conn2.Read(b)
require.Error(t, err)
require.Equal(t, 0, n)
}()
conn2.Close()
select {
case <-done:
case <-time.Tick(time.Second):
t.Fatal("Timeout")
}
_, err = conn.Write([]byte("CLOSE"))
require.NoError(t, err)
select {
case <-doneChan:
case <-time.Tick(10 * time.Second):
// In case we introduce a regression that would make the test wait forever.
t.Fatal("Timeout during shutdown")
}
}
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// requireEcho tests that conn session is live and functional,
// by writing data through it,
// and expecting the same data as a response when reading on it.
// It fatals if the read blocks longer than timeout,
// which is useful to detect regressions that would make a test wait forever.
func requireEcho(t *testing.T, data string, conn io.ReadWriter, timeout time.Duration) {
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t.Helper()
_, err := conn.Write([]byte(data))
require.NoError(t, err)
doneChan := make(chan struct{})
go func() {
b := make([]byte, 1024*1024)
n, err := conn.Read(b)
require.NoError(t, err)
require.Equal(t, data, string(b[:n]))
close(doneChan)
}()
select {
case <-doneChan:
case <-time.Tick(timeout):
t.Fatalf("Timeout during echo for: %s", data)
}
}