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|
package sidechannel
import (
"fmt"
"io"
"net"
"os"
"strconv"
"sync"
"syscall"
"testing"
"github.com/stretchr/testify/require"
)
func TestRegistry(t *testing.T) {
const N = 10
registry := NewRegistry()
t.Run("waiter removed from the registry right after connection received", func(t *testing.T) {
triggerCallback := make(chan struct{})
waiter := registry.Register(func(conn *ClientConn) error {
<-triggerCallback
return nil
})
defer waiter.Close()
require.Equal(t, 1, registry.waiting())
client, _ := socketPair(t)
require.NoError(t, registry.receive(waiter.id, client))
require.Equal(t, 0, registry.waiting())
close(triggerCallback)
require.NoError(t, waiter.Close())
requireConnClosed(t, client)
})
t.Run("receive connections successfully", func(t *testing.T) {
wg := sync.WaitGroup{}
servers := make([]net.Conn, N)
for i := 0; i < N; i++ {
client, server := socketPair(t)
servers[i] = server
defer server.Close()
wg.Add(1)
go func(i int) {
waiter := registry.Register(func(conn *ClientConn) error {
if _, err := fmt.Fprintf(conn, "%d", i); err != nil {
return err
}
return conn.CloseWrite()
})
defer waiter.Close()
require.NoError(t, registry.receive(waiter.id, client))
require.NoError(t, waiter.Close())
requireConnClosed(t, client)
wg.Done()
}(i)
}
for i := 0; i < N; i++ {
// Read registry confirmation
buf := make([]byte, 2)
_, err := io.ReadFull(servers[i], buf)
require.NoError(t, err)
require.Equal(t, "ok", string(buf))
// Read data written by callback
out, err := io.ReadAll(newServerConn(servers[i]))
require.NoError(t, err)
require.Equal(t, strconv.Itoa(i), string(out))
}
wg.Wait()
require.Equal(t, 0, registry.waiting())
})
t.Run("receive connection for non-existing ID", func(t *testing.T) {
client, _ := socketPair(t)
err := registry.receive(registry.nextID+1, client)
require.EqualError(t, err, "sidechannel registry: ID not registered")
requireConnClosed(t, client)
})
t.Run("pre-maturely close the waiter", func(t *testing.T) {
waiter := registry.Register(func(conn *ClientConn) error { panic("never execute") })
require.Equal(t, ErrCallbackDidNotRun, waiter.Close())
require.Equal(t, 0, registry.waiting())
})
}
func requireConnClosed(t *testing.T, conn net.Conn) {
one := make([]byte, 1)
_, err := conn.Read(one)
require.Errorf(t, err, "use of closed network connection")
_, err = conn.Write(one)
require.Errorf(t, err, "use of closed network connection")
}
func socketPair(t *testing.T) (net.Conn, net.Conn) {
conns := make([]net.Conn, 2)
fds, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
require.NoError(t, err)
for i, fd := range fds[:] {
f := os.NewFile(uintptr(fd), "socket pair")
c, err := net.FileConn(f)
require.NoError(t, err)
require.NoError(t, f.Close())
t.Cleanup(func() { c.Close() })
conns[i] = c
}
return conns[0], conns[1]
}
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