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litestream_test.go
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package litestream_test
import (
"bytes"
"encoding/binary"
"encoding/hex"
"os"
"testing"
"github.com/benbjohnson/litestream"
_ "github.com/mattn/go-sqlite3"
)
func TestChecksum(t *testing.T) {
// Ensure a WAL header, frame header, & frame data can be checksummed in one pass.
t.Run("OnePass", func(t *testing.T) {
input, err := hex.DecodeString("377f0682002de218000010000000000052382eac857b1a4e00000002000000020d000000080fe0000ffc0ff80ff40ff00fec0fe80fe40fe00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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if err != nil {
t.Fatal(err)
}
s0, s1 := litestream.Checksum(binary.LittleEndian, 0, 0, input)
if got, want := [2]uint32{s0, s1}, [2]uint32{0xdc2f3e84, 0x540488d3}; got != want {
t.Fatalf("Checksum()=%x, want %x", got, want)
}
})
// Ensure we get the same result as OnePass even if we split up into multiple calls.
t.Run("Incremental", func(t *testing.T) {
// Compute checksum for beginning of WAL header.
s0, s1 := litestream.Checksum(binary.LittleEndian, 0, 0, decodeHexString(t, "377f0682002de218000010000000000052382eac857b1a4e"))
if got, want := [2]uint32{s0, s1}, [2]uint32{0x81153b65, 0x87178e8f}; got != want {
t.Fatalf("Checksum()=%x, want %x", got, want)
}
// Continue checksum with WAL frame header & frame contents.
s0a, s1a := litestream.Checksum(binary.LittleEndian, s0, s1, decodeHexString(t, "0000000200000002"))
s0b, s1b := litestream.Checksum(binary.LittleEndian, s0a, s1a, decodeHexString(t, `0d000000080fe0000ffc0ff80ff40ff00fec0fe80fe40fe00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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if got, want := [2]uint32{s0b, s1b}, [2]uint32{0xdc2f3e84, 0x540488d3}; got != want {
t.Fatalf("Checksum()=%x, want %x", got, want)
}
})
}
func TestFindMinSnapshotByGeneration(t *testing.T) {
infos := []litestream.SnapshotInfo{
{Generation: "29cf4bced74e92ab", Index: 0},
{Generation: "5dfeb4aa03232553", Index: 24},
}
if got, want := litestream.FindMinSnapshotByGeneration(infos, "29cf4bced74e92ab"), &infos[0]; got != want {
t.Fatalf("info=%#v, want %#v", got, want)
}
}
func TestBufferedWALSegmentIterator(t *testing.T) {
t.Run("OK", func(t *testing.T) {
a := []litestream.WALSegmentInfo{{Index: 1}, {Index: 2}}
itr := litestream.NewBufferedWALSegmentIterator(litestream.NewWALSegmentInfoSliceIterator(a))
if info, ok := itr.Peek(); !ok {
t.Fatal("expected info")
} else if got, want := info.Index, 1; got != want {
t.Fatalf("index=%d, want %d", got, want)
}
if !itr.Next() {
t.Fatal("expected next")
} else if got, want := itr.WALSegment().Index, 1; got != want {
t.Fatalf("index=%d, want %d", got, want)
}
if !itr.Next() {
t.Fatal("expected next")
} else if got, want := itr.WALSegment().Index, 2; got != want {
t.Fatalf("index=%d, want %d", got, want)
}
if itr.Next() {
t.Fatal("expected eof")
}
})
t.Run("Empty", func(t *testing.T) {
itr := litestream.NewBufferedWALSegmentIterator(litestream.NewWALSegmentInfoSliceIterator(nil))
if info, ok := itr.Peek(); ok {
t.Fatal("expected eof")
} else if got, want := info.Index, 0; got != want {
t.Fatalf("index=%d, want %d", got, want)
}
})
}
func TestParsePos(t *testing.T) {
t.Run("OK", func(t *testing.T) {
if pos, err := litestream.ParsePos("29cf4bced74e92ab/00000000000003e8:00000000000007d0"); err != nil {
t.Fatal(err)
} else if got, want := pos.Generation, "29cf4bced74e92ab"; got != want {
t.Fatalf("generation=%s, want %s", got, want)
} else if got, want := pos.Index, 1000; got != want {
t.Fatalf("index=%v, want %v", got, want)
} else if got, want := pos.Offset, 2000; got != int64(want) {
t.Fatalf("offset=%v, want %v", got, want)
}
})
t.Run("ErrMismatch", func(t *testing.T) {
_, err := litestream.ParsePos("29cf4bced74e92ab-00000000000003e8-00000000000007d0")
if err == nil || err.Error() != `invalid pos: "29cf4bced74e92ab-00000000000003e8-00000000000007d0"` {
t.Fatal(err)
}
})
t.Run("ErrInvalidIndex", func(t *testing.T) {
_, err := litestream.ParsePos("29cf4bced74e92ab/0000000000000xxx:00000000000007d0")
if err == nil || err.Error() != `cannot parse index: "0000000000000xxx"` {
t.Fatal(err)
}
})
t.Run("ErrInvalidIndex", func(t *testing.T) {
_, err := litestream.ParsePos("29cf4bced74e92ab/00000000000003e8:0000000000000xxx")
if err == nil || err.Error() != `cannot parse offset: "0000000000000xxx"` {
t.Fatal(err)
}
})
}
func decodeHexString(tb testing.TB, s string) []byte {
tb.Helper()
b, err := hex.DecodeString(s)
if err != nil {
tb.Fatal(err)
}
return b
}
// fileEqual returns true if files at x and y have equal contents.
func fileEqual(tb testing.TB, x, y string) bool {
tb.Helper()
bx, err := os.ReadFile(x)
if err != nil {
tb.Fatal(err)
}
by, err := os.ReadFile(y)
if err != nil {
tb.Fatal(err)
}
return bytes.Equal(bx, by)
}