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nbd_test.go
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nbd_test.go
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package lsvd
import (
"context"
"crypto/rand"
"io"
"os"
"testing"
"github.com/lab47/lsvd/logger"
"github.com/stretchr/testify/require"
"golang.org/x/sys/unix"
)
func TestNBD(t *testing.T) {
log := logger.New(logger.Trace)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
var testRand RawBlocks = make([]byte, 4*1024)
_, err := io.ReadFull(rand.Reader, testRand)
if err != nil {
panic(err)
}
t.Run("returns data from the cache", func(t *testing.T) {
r := require.New(t)
dir, err := os.MkdirTemp("", "lsvd")
r.NoError(err)
defer os.RemoveAll(dir)
d, err := NewDisk(ctx, log, dir)
r.NoError(err)
err = d.WriteExtent(ctx, testRandX.MapTo(0))
r.NoError(err)
r.NoError(d.Close(ctx))
d, err = NewDisk(ctx, log, dir)
r.NoError(err)
b := NBDWrapper(ctx, log, d)
fds, err := unix.Socketpair(unix.AF_UNIX, unix.SOCK_STREAM, 0)
r.NoError(err)
rp := os.NewFile(uintptr(fds[0]), "sp1")
wp := os.NewFile(uintptr(fds[1]), "sp2")
defer rp.Close()
defer wp.Close()
buf := make([]byte, BlockSize)
ok, err := b.ReadIntoConn(buf, 0, wp)
r.NoError(err)
wp.Close()
r.True(ok)
data, err := io.ReadAll(rp)
r.NoError(err)
blockEqual(t, testRandX, data)
})
t.Run("attempts to build larger write extents", func(t *testing.T) {
r := require.New(t)
dir, err := os.MkdirTemp("", "lsvd")
r.NoError(err)
defer os.RemoveAll(dir)
d, err := NewDisk(ctx, log, dir)
r.NoError(err)
b := NBDWrapper(ctx, log, d)
n, err := b.WriteAt(testRand, 0)
r.NoError(err)
r.Equal(len(testRand), n)
r.Equal(Extent{0, 1}, b.pendingWrite)
r.Equal([]byte(testRand), b.pendingWriteData.Bytes())
n, err = b.WriteAt(testRand, BlockSize)
r.NoError(err)
r.Equal(len(testRand), n)
r.Equal(Extent{0, 2}, b.pendingWrite)
r.Equal(BlockSize*2, b.pendingWriteData.Len())
r.Equal([]byte(testRand), b.pendingWriteData.Bytes()[:BlockSize])
r.Equal([]byte(testRand), b.pendingWriteData.Bytes()[BlockSize:])
n, err = b.WriteAt(testRand, BlockSize*10)
r.NoError(err)
r.Equal(len(testRand), n)
r.Equal(Extent{10, 1}, b.pendingWrite)
r.Equal(BlockSize, b.pendingWriteData.Len())
r.Equal([]byte(testRand), b.pendingWriteData.Bytes())
err = b.Trim(0, BlockSize)
r.NoError(err)
r.Equal(Extent{0, 0}, b.pendingWrite)
r.Equal(0, b.pendingWriteData.Len())
r.Equal(Extent{0, 1}, b.pendingTrim)
n, err = b.WriteAt(testRand, 0)
r.NoError(err)
r.Equal(len(testRand), n)
r.Equal(Extent{0, 0}, b.pendingTrim)
r.Equal(Extent{0, 1}, b.pendingWrite)
r.Equal(BlockSize, b.pendingWriteData.Len())
r.Equal([]byte(testRand), b.pendingWriteData.Bytes())
err = b.Trim(0, BlockSize)
r.NoError(err)
r.Equal(Extent{0, 1}, b.pendingTrim)
err = b.Trim(0, 2*BlockSize)
r.NoError(err)
r.Equal(Extent{0, 2}, b.pendingTrim)
})
}