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wal_reader_test.go
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247 lines (218 loc) · 7.85 KB
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package litestream_test
import (
"bytes"
"context"
"errors"
"io"
"log/slog"
"os"
"testing"
"github.com/benbjohnson/litestream"
)
func TestWALReader(t *testing.T) {
t.Run("OK", func(t *testing.T) {
buf := make([]byte, 4096)
b, err := os.ReadFile("testdata/wal-reader/ok/wal")
if err != nil {
t.Fatal(err)
}
// Initialize reader with header info.
r, err := litestream.NewWALReader(bytes.NewReader(b), slog.Default())
if err != nil {
t.Fatal(err)
} else if got, want := r.PageSize(), uint32(4096); got != want {
t.Fatalf("PageSize()=%d, want %d", got, want)
} else if got, want := r.Offset(), int64(0); got != want {
t.Fatalf("Offset()=%d, want %d", got, want)
}
// Read first frame.
if pgno, commit, err := r.ReadFrame(context.Background(), buf); err != nil {
t.Fatal(err)
} else if got, want := pgno, uint32(1); got != want {
t.Fatalf("pgno=%d, want %d", got, want)
} else if got, want := commit, uint32(0); got != want {
t.Fatalf("commit=%d, want %d", got, want)
} else if !bytes.Equal(buf, b[56:4152]) {
t.Fatal("page data mismatch")
} else if got, want := r.Offset(), int64(32); got != want {
t.Fatalf("Offset()=%d, want %d", got, want)
}
// Read second frame. End of transaction.
if pgno, commit, err := r.ReadFrame(context.Background(), buf); err != nil {
t.Fatal(err)
} else if got, want := pgno, uint32(2); got != want {
t.Fatalf("pgno=%d, want %d", got, want)
} else if got, want := commit, uint32(2); got != want {
t.Fatalf("commit=%d, want %d", got, want)
} else if !bytes.Equal(buf, b[4176:8272]) {
t.Fatal("page data mismatch")
} else if got, want := r.Offset(), int64(4152); got != want {
t.Fatalf("Offset()=%d, want %d", got, want)
}
// Read third frame.
if pgno, commit, err := r.ReadFrame(context.Background(), buf); err != nil {
t.Fatal(err)
} else if got, want := pgno, uint32(2); got != want {
t.Fatalf("pgno=%d, want %d", got, want)
} else if got, want := commit, uint32(2); got != want {
t.Fatalf("commit=%d, want %d", got, want)
} else if !bytes.Equal(buf, b[8296:12392]) {
t.Fatal("page data mismatch")
} else if got, want := r.Offset(), int64(8272); got != want {
t.Fatalf("Offset()=%d, want %d", got, want)
}
if _, _, err := r.ReadFrame(context.Background(), buf); !errors.Is(err, io.EOF) {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("SaltMismatch", func(t *testing.T) {
buf := make([]byte, 4096)
b, err := os.ReadFile("testdata/wal-reader/salt-mismatch/wal")
if err != nil {
t.Fatal(err)
}
// Initialize reader with header info.
r, err := litestream.NewWALReader(bytes.NewReader(b), slog.Default())
if err != nil {
t.Fatal(err)
} else if got, want := r.PageSize(), uint32(4096); got != want {
t.Fatalf("PageSize()=%d, want %d", got, want)
} else if got, want := r.Offset(), int64(0); got != want {
t.Fatalf("Offset()=%d, want %d", got, want)
}
// Read first frame.
if pgno, commit, err := r.ReadFrame(context.Background(), buf); err != nil {
t.Fatal(err)
} else if got, want := pgno, uint32(1); got != want {
t.Fatalf("pgno=%d, want %d", got, want)
} else if got, want := commit, uint32(0); got != want {
t.Fatalf("commit=%d, want %d", got, want)
} else if !bytes.Equal(buf, b[56:4152]) {
t.Fatal("page data mismatch")
}
// Read second frame. Salt has been altered so it doesn't match header.
if _, _, err := r.ReadFrame(context.Background(), buf); !errors.Is(err, io.EOF) {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("FrameChecksumMismatch", func(t *testing.T) {
buf := make([]byte, 4096)
b, err := os.ReadFile("testdata/wal-reader/frame-checksum-mismatch/wal")
if err != nil {
t.Fatal(err)
}
// Initialize reader with header info.
r, err := litestream.NewWALReader(bytes.NewReader(b), slog.Default())
if err != nil {
t.Fatal(err)
} else if got, want := r.PageSize(), uint32(4096); got != want {
t.Fatalf("PageSize()=%d, want %d", got, want)
} else if got, want := r.Offset(), int64(0); got != want {
t.Fatalf("Offset()=%d, want %d", got, want)
}
// Read first frame.
if pgno, commit, err := r.ReadFrame(context.Background(), buf); err != nil {
t.Fatal(err)
} else if got, want := pgno, uint32(1); got != want {
t.Fatalf("pgno=%d, want %d", got, want)
} else if got, want := commit, uint32(0); got != want {
t.Fatalf("commit=%d, want %d", got, want)
} else if !bytes.Equal(buf, b[56:4152]) {
t.Fatal("page data mismatch")
}
// Read second frame. Checksum has been altered so it doesn't match.
if _, _, err := r.ReadFrame(context.Background(), buf); !errors.Is(err, io.EOF) {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ZeroLength", func(t *testing.T) {
_, err := litestream.NewWALReader(bytes.NewReader(nil), slog.Default())
if !errors.Is(err, io.EOF) {
t.Fatalf("unexpected error: %#v", err)
}
})
t.Run("PartialHeader", func(t *testing.T) {
_, err := litestream.NewWALReader(bytes.NewReader(make([]byte, 10)), slog.Default())
if !errors.Is(err, io.EOF) {
t.Fatalf("unexpected error: %#v", err)
}
})
t.Run("BadMagic", func(t *testing.T) {
_, err := litestream.NewWALReader(bytes.NewReader(make([]byte, 32)), slog.Default())
if err == nil || err.Error() != `invalid wal header magic: 0` {
t.Fatalf("unexpected error: %#v", err)
}
})
t.Run("BadHeaderChecksum", func(t *testing.T) {
data := []byte{
0x37, 0x7f, 0x06, 0x83, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
_, err := litestream.NewWALReader(bytes.NewReader(data), slog.Default())
if !errors.Is(err, io.EOF) {
t.Fatalf("unexpected error: %#v", err)
}
})
t.Run("BadHeaderVersion", func(t *testing.T) {
data := []byte{
0x37, 0x7f, 0x06, 0x83, 0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x15, 0x7b, 0x20, 0x92, 0xbb, 0xf8, 0x34, 0x1d}
_, err := litestream.NewWALReader(bytes.NewReader(data), slog.Default())
if err == nil || err.Error() != `unsupported wal version: 1` {
t.Fatalf("unexpected error: %#v", err)
}
})
t.Run("ErrBufferSize", func(t *testing.T) {
b, err := os.ReadFile("testdata/wal-reader/ok/wal")
if err != nil {
t.Fatal(err)
}
// Initialize reader with header info.
r, err := litestream.NewWALReader(bytes.NewReader(b), slog.Default())
if err != nil {
t.Fatal(err)
}
if _, _, err := r.ReadFrame(context.Background(), make([]byte, 512)); err == nil || err.Error() != `WALReader.ReadFrame(): buffer size (512) must match page size (4096)` {
t.Fatalf("unexpected error: %#v", err)
}
})
t.Run("ErrPartialFrameHeader", func(t *testing.T) {
b, err := os.ReadFile("testdata/wal-reader/ok/wal")
if err != nil {
t.Fatal(err)
}
r, err := litestream.NewWALReader(bytes.NewReader(b[:40]), slog.Default())
if err != nil {
t.Fatal(err)
} else if _, _, err := r.ReadFrame(context.Background(), make([]byte, 4096)); !errors.Is(err, io.EOF) {
t.Fatalf("unexpected error: %#v", err)
}
})
t.Run("ErrFrameHeaderOnly", func(t *testing.T) {
b, err := os.ReadFile("testdata/wal-reader/ok/wal")
if err != nil {
t.Fatal(err)
}
r, err := litestream.NewWALReader(bytes.NewReader(b[:56]), slog.Default())
if err != nil {
t.Fatal(err)
} else if _, _, err := r.ReadFrame(context.Background(), make([]byte, 4096)); !errors.Is(err, io.EOF) {
t.Fatalf("unexpected error: %#v", err)
}
})
t.Run("ErrPartialFrameData", func(t *testing.T) {
b, err := os.ReadFile("testdata/wal-reader/ok/wal")
if err != nil {
t.Fatal(err)
}
r, err := litestream.NewWALReader(bytes.NewReader(b[:1000]), slog.Default())
if err != nil {
t.Fatal(err)
} else if _, _, err := r.ReadFrame(context.Background(), make([]byte, 4096)); !errors.Is(err, io.EOF) {
t.Fatalf("unexpected error: %#v", err)
}
})
}