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socket_test.go
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socket_test.go
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/* SPDX-License-Identifier: ISC
*
* Copyright (c) 2019-2024 Stanford University
* Copyright (c) 2024 Damian Peckett <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package homa_test
import (
"bytes"
"context"
"crypto/rand"
"crypto/sha256"
"errors"
"fmt"
"io"
"math/big"
"net"
"testing"
homa "github.com/dpeckett/go-homa"
"github.com/stretchr/testify/require"
"golang.org/x/sync/errgroup"
)
// TestHomaRPC tests the Homa RPC protocol, by sending a number of random
// messages to a server, which then replies with the SHA256 hash of the
// message, which is then verified by the client. Kind of an end-to-end
// echo server test.
func TestHomaRPC(t *testing.T) {
serverAddr, err := net.ResolveUDPAddr("udp", "localhost:0")
require.NoError(t, err)
serverSock, err := homa.NewSocket(serverAddr)
require.NoError(t, err)
clientAddr, err := net.ResolveUDPAddr("udp", "localhost:0")
require.NoError(t, err)
clientSock, err := homa.NewSocket(clientAddr)
require.NoError(t, err)
g, ctx := errgroup.WithContext(context.Background())
ctx, cancel := context.WithCancel(ctx)
g.Go(func() error {
defer serverSock.Close()
errCh := make(chan error, 1)
defer close(errCh)
go func() {
for {
msg, err := serverSock.Recv()
if err != nil {
if errors.Is(err, net.ErrClosed) {
errCh <- nil
return
}
errCh <- err
return
}
h := sha256.New()
if _, err := io.Copy(h, msg); err != nil {
errCh <- err
return
}
if err := msg.Close(); err != nil {
errCh <- err
return
}
if err := serverSock.Reply(msg.PeerAddr(), msg.ID(), h.Sum(nil)); err != nil {
errCh <- err
return
}
}
}()
select {
case <-ctx.Done():
return nil
case err := <-errCh:
return err
}
})
g.Go(func() error {
defer clientSock.Close()
defer cancel()
for i := 0; i < 100; i++ {
size, err := rand.Int(rand.Reader, big.NewInt(homa.HOMA_MAX_MESSAGE_LENGTH-1))
if err != nil {
return err
}
buf := make([]byte, 1+size.Int64())
if _, err := rand.Read(buf); err != nil {
return err
}
expectedHash := sha256.Sum256(buf)
id, err := clientSock.Send(serverSock.LocalAddr(), buf, 0)
if err != nil {
return err
}
if id <= 0 {
return fmt.Errorf("expected message id > 0, got %d", id)
}
msg, err := clientSock.Recv()
if err != nil {
return err
}
actualHash := make([]byte, sha256.Size)
if _, err := msg.Read(actualHash); err != nil {
return err
}
if err := msg.Close(); err != nil {
return err
}
if !bytes.Equal(expectedHash[:], actualHash) {
return fmt.Errorf("expected %x, got %x", expectedHash, actualHash)
}
}
return nil
})
require.NoError(t, g.Wait())
}