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ltx_test.go
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ltx_test.go
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package ltx_test
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"math"
"math/rand"
"os"
"reflect"
"testing"
"time"
"github.com/superfly/ltx"
)
func TestNewPos(t *testing.T) {
pos := ltx.NewPos(1000, 2000)
if got, want := pos.TXID, ltx.TXID(1000); got != want {
t.Fatalf("TXID=%s, want %s", got, want)
}
if got, want := pos.PostApplyChecksum, ltx.Checksum(2000); got != want {
t.Fatalf("PostApplyChecksum=%v, want %v", got, want)
}
}
func TestPos_String(t *testing.T) {
pos := ltx.NewPos(1000, 2000)
if got, want := pos.String(), "00000000000003e8/00000000000007d0"; got != want {
t.Fatalf("Pos = %s, want = %s", got, want)
}
}
func TestParsePos(t *testing.T) {
t.Run("OK", func(t *testing.T) {
if v, err := ltx.ParsePos("00000000000003e8/00000000000007d0"); err != nil {
t.Fatal(err)
} else if got, want := v, ltx.NewPos(1000, 2000); got != want {
t.Fatalf("got=%d, want %d", got, want)
}
})
t.Run("ErrTooShort", func(t *testing.T) {
if _, err := ltx.ParsePos("00000000000003e8"); err == nil || err.Error() != `invalid formatted position length: "00000000000003e8"` {
t.Fatal(err)
}
})
}
func TestHeader_Validate(t *testing.T) {
t.Run("OK", func(t *testing.T) {
hdr := ltx.Header{
Version: 1,
PageSize: 1024,
Commit: 2,
MinTXID: 3,
MaxTXID: 4,
PreApplyChecksum: ltx.ChecksumFlag,
WALSalt1: 5,
WALSalt2: 6,
WALOffset: 7,
WALSize: 8,
}
if err := hdr.Validate(); err != nil {
t.Fatal(err)
}
})
t.Run("CommitZero", func(t *testing.T) {
hdr := ltx.Header{
Version: 1,
PageSize: 1024,
Commit: 0,
MinTXID: 5,
MaxTXID: 5,
PreApplyChecksum: ltx.ChecksumFlag,
}
if err := hdr.Validate(); err != nil {
t.Fatal(err)
}
})
t.Run("ErrVersion", func(t *testing.T) {
hdr := ltx.Header{}
if err := hdr.Validate(); err == nil || err.Error() != `invalid version` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrFlags", func(t *testing.T) {
hdr := ltx.Header{Version: 1, Flags: 2}
if err := hdr.Validate(); err == nil || err.Error() != `invalid flags: 0x00000002` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrInvalidPageSize", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1000}
if err := hdr.Validate(); err == nil || err.Error() != `invalid page size: 1000` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrMinTXIDRequired", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 2}
if err := hdr.Validate(); err == nil || err.Error() != `minimum transaction id required` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrMaxTXIDRequired", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 2, MinTXID: 3}
if err := hdr.Validate(); err == nil || err.Error() != `maximum transaction id required` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrTXIDOutOfOrderRequired", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 2, MinTXID: 3, MaxTXID: 2}
if err := hdr.Validate(); err == nil || err.Error() != `transaction ids out of order: (3,2)` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrNegativeWALOffset", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 2, MinTXID: 1, MaxTXID: 1, WALOffset: -1000}
if err := hdr.Validate(); err == nil || err.Error() != `wal offset cannot be negative: -1000` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrNegativeWALSize", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 2, MinTXID: 1, MaxTXID: 1, WALOffset: 32, WALSize: -1000}
if err := hdr.Validate(); err == nil || err.Error() != `wal size cannot be negative: -1000` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrWALOffsetRequiredWithWALSalt", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 2, MinTXID: 1, MaxTXID: 1, WALSalt1: 100}
if err := hdr.Validate(); err == nil || err.Error() != `wal offset required if salt exists` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrWALSizeRequiredWithWALSalt", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 2, MinTXID: 1, MaxTXID: 1, WALSalt2: 100, WALOffset: 1000}
if err := hdr.Validate(); err == nil || err.Error() != `wal size required if salt exists` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrWALSizeRequiredWithWALOffset", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 2, MinTXID: 1, MaxTXID: 1, WALOffset: 1000}
if err := hdr.Validate(); err == nil || err.Error() != `wal size required if wal offset exists` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrWALOffsetRequiredWithWALSize", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 2, MinTXID: 1, MaxTXID: 1, WALSize: 1000}
if err := hdr.Validate(); err == nil || err.Error() != `wal offset required if wal size exists` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrSnapshotPreApplyChecksumNotAllowed", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 4, MinTXID: 1, MaxTXID: 3, PreApplyChecksum: 1}
if err := hdr.Validate(); err == nil || err.Error() != `pre-apply checksum must be zero on snapshots` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrNonSnapshotPreApplyChecksumRequired", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 4, MinTXID: 2, MaxTXID: 3}
if err := hdr.Validate(); err == nil || err.Error() != `pre-apply checksum required on non-snapshot files` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrInvalidPreApplyChecksumFormat", func(t *testing.T) {
hdr := ltx.Header{Version: 1, PageSize: 1024, Commit: 4, MinTXID: 2, MaxTXID: 3, PreApplyChecksum: 1}
if err := hdr.Validate(); err == nil || err.Error() != `invalid pre-apply checksum format` {
t.Fatalf("unexpected error: %s", err)
}
})
}
func TestHeader_MarshalBinary(t *testing.T) {
hdr := ltx.Header{
Version: ltx.Version,
Flags: 0,
PageSize: 1024,
Commit: 1006,
MinTXID: 1007,
MaxTXID: 1008,
Timestamp: 1009,
PreApplyChecksum: 1011,
WALSalt1: 1012,
WALSalt2: 1013,
WALOffset: 1014,
WALSize: 1015,
}
var other ltx.Header
if b, err := hdr.MarshalBinary(); err != nil {
t.Fatal(err)
} else if err := other.UnmarshalBinary(b); err != nil {
t.Fatal(err)
} else if !reflect.DeepEqual(hdr, other) {
t.Fatalf("mismatch:\ngot=%#v\nwant=%#v", hdr, other)
}
}
func TestHeader_UnmarshalBinary(t *testing.T) {
t.Run("ErrShortBuffer", func(t *testing.T) {
var hdr ltx.Header
if err := hdr.UnmarshalBinary(make([]byte, 10)); err != io.ErrShortBuffer {
t.Fatal(err)
}
})
t.Run("ErrInvalidFile", func(t *testing.T) {
var hdr ltx.Header
if err := hdr.UnmarshalBinary(make([]byte, ltx.HeaderSize)); err != ltx.ErrInvalidFile {
t.Fatal(err)
}
})
}
func TestPeekHeader(t *testing.T) {
t.Run("OK", func(t *testing.T) {
hdr := ltx.Header{
Version: ltx.Version,
Flags: 0,
PageSize: 1024,
Commit: 1006,
MinTXID: 1007,
MaxTXID: 1008,
Timestamp: 1009,
PreApplyChecksum: 1011,
WALSalt1: 1012,
WALSalt2: 1013,
WALOffset: 1014,
WALSize: 1015,
}
b, err := hdr.MarshalBinary()
if err != nil {
t.Fatal(err)
}
var buf bytes.Buffer
buf.Write(b)
buf.Write([]byte("foobar"))
// Read the header once.
other, r, err := ltx.PeekHeader(&buf)
if err != nil {
t.Fatal(err)
} else if !reflect.DeepEqual(hdr, other) {
t.Fatalf("mismatch:\ngot=%#v\nwant=%#v", hdr, other)
}
// Read it again from the returned reader.
if other, _, err = ltx.PeekHeader(r); err != nil {
t.Fatal(err)
} else if !reflect.DeepEqual(hdr, other) {
t.Fatalf("mismatch:\ngot=%#v\nwant=%#v", hdr, other)
}
// Read the rest of the data.
if trailing, err := io.ReadAll(r); err != nil {
t.Fatal(err)
} else if got, want := string(trailing), "foobar"; got != want {
t.Fatalf("trailing=%s, want %s", got, want)
}
})
t.Run("EOF", func(t *testing.T) {
if _, _, err := ltx.PeekHeader(bytes.NewReader(nil)); err != io.EOF {
t.Fatal(err)
}
})
t.Run("ErrUnexpectedEOF", func(t *testing.T) {
if _, _, err := ltx.PeekHeader(bytes.NewReader([]byte("foo"))); err != io.ErrUnexpectedEOF {
t.Fatal(err)
}
})
}
func TestPageHeader_Validate(t *testing.T) {
t.Run("OK", func(t *testing.T) {
hdr := ltx.PageHeader{Pgno: 1}
if err := hdr.Validate(); err != nil {
t.Fatal(err)
}
})
t.Run("ErrPgnoRequired", func(t *testing.T) {
hdr := ltx.PageHeader{}
if err := hdr.Validate(); err == nil || err.Error() != `page number required` {
t.Fatalf("unexpected error: %s", err)
}
})
}
func TestPageHeader_MarshalBinary(t *testing.T) {
hdr := ltx.PageHeader{Pgno: 1000}
var other ltx.PageHeader
if b, err := hdr.MarshalBinary(); err != nil {
t.Fatal(err)
} else if err := other.UnmarshalBinary(b); err != nil {
t.Fatal(err)
} else if !reflect.DeepEqual(hdr, other) {
t.Fatalf("mismatch:\ngot=%#v\nwant=%#v", hdr, other)
}
}
func TestPageHeader_UnmarshalBinary(t *testing.T) {
t.Run("ErrShortBuffer", func(t *testing.T) {
var hdr ltx.PageHeader
if err := hdr.UnmarshalBinary(make([]byte, 2)); err != io.ErrShortBuffer {
t.Fatal(err)
}
})
}
func TestTrailer_Validate(t *testing.T) {
t.Run("OK", func(t *testing.T) {
trailer := ltx.Trailer{
PostApplyChecksum: ltx.ChecksumFlag | 1,
FileChecksum: ltx.ChecksumFlag | 2,
}
if err := trailer.Validate(); err != nil {
t.Fatal(err)
}
})
t.Run("ErrPostApplyChecksumRequired", func(t *testing.T) {
trailer := ltx.Trailer{}
if err := trailer.Validate(); err == nil || err.Error() != `post-apply checksum required` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrInvalidPostApplyChecksum", func(t *testing.T) {
trailer := ltx.Trailer{PostApplyChecksum: 1}
if err := trailer.Validate(); err == nil || err.Error() != `invalid post-apply checksum format` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrFileChecksumRequired", func(t *testing.T) {
trailer := ltx.Trailer{PostApplyChecksum: ltx.ChecksumFlag}
if err := trailer.Validate(); err == nil || err.Error() != `file checksum required` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrInvalidFileChecksum", func(t *testing.T) {
trailer := ltx.Trailer{PostApplyChecksum: ltx.ChecksumFlag, FileChecksum: 1}
if err := trailer.Validate(); err == nil || err.Error() != `invalid file checksum format` {
t.Fatalf("unexpected error: %s", err)
}
})
}
func TestIsValidHeaderFlags(t *testing.T) {
if !ltx.IsValidHeaderFlags(0) {
t.Fatal("expected valid")
} else if ltx.IsValidHeaderFlags(100) {
t.Fatal("expected invalid")
}
}
func TestIsValidPageSize(t *testing.T) {
t.Run("OK", func(t *testing.T) {
for _, sz := range []uint32{512, 1024, 2048, 4096, 8192, 16384, 32768, 65536} {
if !ltx.IsValidPageSize(sz) {
t.Fatalf("expected page size of %d to be valid", sz)
}
}
})
t.Run("TooSmall", func(t *testing.T) {
if ltx.IsValidPageSize(256) {
t.Fatal("expected invalid")
}
})
t.Run("TooLarge", func(t *testing.T) {
if ltx.IsValidPageSize(131072) {
t.Fatal("expected invalid")
}
})
t.Run("NotPowerOfTwo", func(t *testing.T) {
if ltx.IsValidPageSize(1000) {
t.Fatal("expected invalid")
}
})
}
func TestParseFilename(t *testing.T) {
t.Run("OK", func(t *testing.T) {
if min, max, err := ltx.ParseFilename("0000000000000001-00000000000003e8.ltx"); err != nil {
t.Fatal(err)
} else if got, want := min, ltx.TXID(1); got != want {
t.Fatalf("min=%d, want %d", got, want)
} else if got, want := max, ltx.TXID(1000); got != want {
t.Fatalf("max=%d, want %d", got, want)
}
})
t.Run("ErrInvalid", func(t *testing.T) {
if _, _, err := ltx.ParseFilename("000000000000000z-00000000000003e8.ltx"); err == nil {
t.Fatal("expected error")
}
if _, _, err := ltx.ParseFilename("0000000000000001.ltx"); err == nil {
t.Fatal("expected error")
}
if _, _, err := ltx.ParseFilename("000000000000000z-00000000000003e8.zzz"); err == nil {
t.Fatal("expected error")
}
})
}
func TestChecksumReader(t *testing.T) {
t.Run("OK", func(t *testing.T) {
r := io.MultiReader(
bytes.NewReader(bytes.Repeat([]byte("\x01"), 512)),
bytes.NewReader(bytes.Repeat([]byte("\x02"), 512)),
bytes.NewReader(bytes.Repeat([]byte("\x03"), 512)),
)
if chksum, err := ltx.ChecksumReader(r, 512); err != nil {
t.Fatal(err)
} else if got, want := chksum, ltx.Checksum(0xefffffffecd99000); got != want {
t.Fatalf("got=%x, want %x", got, want)
}
})
t.Run("ErrUnexpectedEOF", func(t *testing.T) {
r := bytes.NewReader(bytes.Repeat([]byte("\x01"), 512))
if _, err := ltx.ChecksumReader(r, 1024); err != io.ErrUnexpectedEOF {
t.Fatal(err)
}
})
}
func TestTXID_MarshalJSON(t *testing.T) {
t.Run("OK", func(t *testing.T) {
txID := ltx.TXID(1000)
if buf, err := json.Marshal(txID); err != nil {
t.Fatal(err)
} else if got, want := string(buf), `"00000000000003e8"`; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
})
t.Run("Map", func(t *testing.T) {
m := map[string]ltx.TXID{"x": 1000, "y": 2000}
if buf, err := json.Marshal(m); err != nil {
t.Fatal(err)
} else if got, want := string(buf), `{"x":"00000000000003e8","y":"00000000000007d0"}`; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
})
}
func TestTXID_UnmarshalJSON(t *testing.T) {
t.Run("OK", func(t *testing.T) {
var txID ltx.TXID
if err := json.Unmarshal([]byte(`"00000000000003e8"`), &txID); err != nil {
t.Fatal(err)
} else if got, want := txID, ltx.TXID(1000); got != want {
t.Fatalf("got=%q, want %q", got, want)
}
})
t.Run("Null", func(t *testing.T) {
var txID ltx.TXID
if err := json.Unmarshal([]byte(`null`), &txID); err != nil {
t.Fatal(err)
} else if got, want := txID, ltx.TXID(0); got != want {
t.Fatalf("got=%q, want %q", got, want)
}
})
t.Run("Map", func(t *testing.T) {
var m map[string]ltx.TXID
if err := json.Unmarshal([]byte(`{"x":"00000000000003e8","y":"00000000000007d0"}`), &m); err != nil {
t.Fatal(err)
} else if !reflect.DeepEqual(m, map[string]ltx.TXID{"x": 1000, "y": 2000}) {
t.Fatalf("unexpected map: %#v", m)
}
})
t.Run("ErrInvalidType", func(t *testing.T) {
var txID ltx.TXID
if err := json.Unmarshal([]byte(`123`), &txID); err == nil || err.Error() != `cannot unmarshal TXID from JSON value` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrStringFormat", func(t *testing.T) {
var txID ltx.TXID
if err := json.Unmarshal([]byte(`"xyz"`), &txID); err == nil || err.Error() != `cannot parse TXID from JSON string: "xyz"` {
t.Fatalf("unexpected error: %s", err)
}
})
}
func TestTXID_String(t *testing.T) {
if got, want := ltx.TXID(0).String(), "0000000000000000"; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
if got, want := ltx.TXID(1000).String(), "00000000000003e8"; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
if got, want := ltx.TXID(math.MaxUint64).String(), "ffffffffffffffff"; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
}
func TestParseTXID(t *testing.T) {
t.Run("OK", func(t *testing.T) {
if v, err := ltx.ParseTXID("0000000000000000"); err != nil {
t.Fatal(err)
} else if got, want := v, ltx.TXID(0); got != want {
t.Fatalf("got=%d, want %d", got, want)
}
if v, err := ltx.ParseTXID("00000000000003e8"); err != nil {
t.Fatal(err)
} else if got, want := v, ltx.TXID(1000); got != want {
t.Fatalf("got=%d, want %d", got, want)
}
if v, err := ltx.ParseTXID("ffffffffffffffff"); err != nil {
t.Fatal(err)
} else if got, want := v, ltx.TXID(math.MaxUint64); got != want {
t.Fatalf("got=%d, want %d", got, want)
}
})
t.Run("ErrTooShort", func(t *testing.T) {
if _, err := ltx.ParseTXID("000000000e38"); err == nil || err.Error() != `invalid formatted transaction id length: "000000000e38"` {
t.Fatal(err)
}
})
t.Run("ErrTooLong", func(t *testing.T) {
if _, err := ltx.ParseTXID("ffffffffffffffff0"); err == nil || err.Error() != `invalid formatted transaction id length: "ffffffffffffffff0"` {
t.Fatal(err)
}
})
t.Run("ErrInvalidFormat", func(t *testing.T) {
if _, err := ltx.ParseTXID("xxxxxxxxxxxxxxxx"); err == nil || err.Error() != `invalid transaction id format: "xxxxxxxxxxxxxxxx"` {
t.Fatal(err)
}
})
}
func TestChecksum_MarshalJSON(t *testing.T) {
t.Run("OK", func(t *testing.T) {
chksum := ltx.Checksum(1000)
if buf, err := json.Marshal(chksum); err != nil {
t.Fatal(err)
} else if got, want := string(buf), `"00000000000003e8"`; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
})
t.Run("Map", func(t *testing.T) {
m := map[string]ltx.Checksum{"x": 1000, "y": 2000}
if buf, err := json.Marshal(m); err != nil {
t.Fatal(err)
} else if got, want := string(buf), `{"x":"00000000000003e8","y":"00000000000007d0"}`; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
})
}
func TestChecksum_UnmarshalJSON(t *testing.T) {
t.Run("OK", func(t *testing.T) {
var chksum ltx.Checksum
if err := json.Unmarshal([]byte(`"00000000000003e8"`), &chksum); err != nil {
t.Fatal(err)
} else if got, want := chksum, ltx.Checksum(1000); got != want {
t.Fatalf("got=%q, want %q", got, want)
}
})
t.Run("Null", func(t *testing.T) {
var chksum ltx.Checksum
if err := json.Unmarshal([]byte(`null`), &chksum); err != nil {
t.Fatal(err)
} else if got, want := chksum, ltx.Checksum(0); got != want {
t.Fatalf("got=%q, want %q", got, want)
}
})
t.Run("Map", func(t *testing.T) {
var m map[string]ltx.Checksum
if err := json.Unmarshal([]byte(`{"x":"00000000000003e8","y":"00000000000007d0"}`), &m); err != nil {
t.Fatal(err)
} else if !reflect.DeepEqual(m, map[string]ltx.Checksum{"x": 1000, "y": 2000}) {
t.Fatalf("unexpected map: %#v", m)
}
})
t.Run("ErrInvalidType", func(t *testing.T) {
var chksum ltx.Checksum
if err := json.Unmarshal([]byte(`123`), &chksum); err == nil || err.Error() != `cannot unmarshal checksum from JSON value` {
t.Fatalf("unexpected error: %s", err)
}
})
t.Run("ErrStringFormat", func(t *testing.T) {
var chksum ltx.Checksum
if err := json.Unmarshal([]byte(`"xyz"`), &chksum); err == nil || err.Error() != `cannot parse checksum from JSON string: "xyz"` {
t.Fatalf("unexpected error: %s", err)
}
})
}
func TestChecksum_String(t *testing.T) {
if got, want := ltx.Checksum(0).String(), "0000000000000000"; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
if got, want := ltx.Checksum(1000).String(), "00000000000003e8"; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
if got, want := ltx.Checksum(math.MaxUint64).String(), "ffffffffffffffff"; got != want {
t.Fatalf("got=%q, want %q", got, want)
}
}
func TestParseChecksum(t *testing.T) {
t.Run("OK", func(t *testing.T) {
if v, err := ltx.ParseChecksum("0000000000000000"); err != nil {
t.Fatal(err)
} else if got, want := v, ltx.Checksum(0); got != want {
t.Fatalf("got=%d, want %d", got, want)
}
if v, err := ltx.ParseChecksum("00000000000003e8"); err != nil {
t.Fatal(err)
} else if got, want := v, ltx.Checksum(1000); got != want {
t.Fatalf("got=%d, want %d", got, want)
}
if v, err := ltx.ParseChecksum("ffffffffffffffff"); err != nil {
t.Fatal(err)
} else if got, want := v, ltx.Checksum(math.MaxUint64); got != want {
t.Fatalf("got=%d, want %d", got, want)
}
})
t.Run("ErrTooShort", func(t *testing.T) {
if _, err := ltx.ParseChecksum("000000000e38"); err == nil || err.Error() != `invalid formatted checksum length: "000000000e38"` {
t.Fatal(err)
}
})
t.Run("ErrTooLong", func(t *testing.T) {
if _, err := ltx.ParseChecksum("ffffffffffffffff0"); err == nil || err.Error() != `invalid formatted checksum length: "ffffffffffffffff0"` {
t.Fatal(err)
}
})
t.Run("ErrInvalidFormat", func(t *testing.T) {
if _, err := ltx.ParseChecksum("xxxxxxxxxxxxxxxx"); err == nil || err.Error() != `invalid checksum format: "xxxxxxxxxxxxxxxx"` {
t.Fatal(err)
}
})
}
func TestFormatTimestamp(t *testing.T) {
for _, tt := range []struct {
t time.Time
want string
}{
{time.Date(2000, 10, 20, 30, 40, 50, 0, time.UTC), "2000-10-21T06:40:50.000Z"},
{time.Date(2000, 10, 20, 30, 40, 50, 123000000, time.UTC), "2000-10-21T06:40:50.123Z"},
{time.Date(2000, 10, 20, 30, 40, 50, 120000000, time.UTC), "2000-10-21T06:40:50.120Z"},
{time.Date(2000, 10, 20, 30, 40, 50, 100000000, time.UTC), "2000-10-21T06:40:50.100Z"},
{time.Date(2000, 10, 20, 30, 40, 50, 100000, time.UTC), "2000-10-21T06:40:50.000Z"}, // submillisecond
} {
if got := ltx.FormatTimestamp(tt.t); got != tt.want {
t.Fatalf("got=%s, want %s", got, tt.want)
}
}
}
func TestParseTimestamp(t *testing.T) {
for _, tt := range []struct {
str string
want time.Time
}{
{"2000-10-21T06:40:50.000Z", time.Date(2000, 10, 20, 30, 40, 50, 0, time.UTC)},
{"2000-10-21T06:40:50.123Z", time.Date(2000, 10, 20, 30, 40, 50, 123000000, time.UTC)},
{"2000-10-21T06:40:50.120Z", time.Date(2000, 10, 20, 30, 40, 50, 120000000, time.UTC)},
{"2000-10-21T06:40:50.100Z", time.Date(2000, 10, 20, 30, 40, 50, 100000000, time.UTC)},
{"2000-10-21T06:40:50Z", time.Date(2000, 10, 20, 30, 40, 50, 0, time.UTC)},
{"2000-10-21T06:40:50.000123Z", time.Date(2000, 10, 20, 30, 40, 50, 0, time.UTC)},
{"2000-10-21T06:40:50.000000123Z", time.Date(2000, 10, 20, 30, 40, 50, 0, time.UTC)},
} {
if got, err := ltx.ParseTimestamp(tt.str); err != nil {
t.Fatal(err)
} else if !got.Equal(tt.want) {
t.Fatalf("got=%s, want %s", got, tt.want)
}
}
}
func BenchmarkChecksumPage(b *testing.B) {
for _, pageSize := range []int{512, 1024, 2048, 4096, 8192, 16384, 32768, 65536} {
b.Run(fmt.Sprint(pageSize), func(b *testing.B) {
benchmarkChecksumPage(b, pageSize)
})
}
}
func benchmarkChecksumPage(b *testing.B, pageSize int) {
data := make([]byte, pageSize)
_, _ = rand.Read(data)
b.ReportAllocs()
b.SetBytes(int64(pageSize))
b.ResetTimer()
for i := 0; i < b.N; i++ {
ltx.ChecksumPage(uint32(i%math.MaxUint32), data)
}
}
func BenchmarkChecksumPageWithHasher(b *testing.B) {
for _, pageSize := range []int{512, 1024, 2048, 4096, 8192, 16384, 32768, 65536} {
b.Run(fmt.Sprint(pageSize), func(b *testing.B) {
benchmarkChecksumPageWithHasher(b, pageSize)
})
}
}
func benchmarkChecksumPageWithHasher(b *testing.B, pageSize int) {
data := make([]byte, pageSize)
_, _ = rand.Read(data)
b.ReportAllocs()
b.SetBytes(int64(pageSize))
b.ResetTimer()
h := ltx.NewHasher()
for i := 0; i < b.N; i++ {
ltx.ChecksumPageWithHasher(h, uint32(i%math.MaxUint32), data)
}
}
// BenchmarkXOR simulates the sum of checksums for a 1GB database (assuming 4KB pages).
func BenchmarkXOR(b *testing.B) {
const pageSize = 4096
const pageN = (1 << 30) / pageSize
m := make(map[uint32]ltx.Checksum)
page := make([]byte, pageSize)
for pgno := uint32(1); pgno <= pageN; pgno++ {
_, _ = rand.Read(page)
m[pgno] = ltx.ChecksumPage(pgno, page)
}
b.SetBytes(int64(pageN * pageSize))
b.ResetTimer()
for i := 0; i < b.N; i++ {
var chksum ltx.Checksum
for pgno := uint32(1); pgno <= pageN; pgno++ {
chksum ^= m[pgno]
}
}
}
// createFile creates a file and returns the file handle. Closes on cleanup.
func createFile(tb testing.TB, name string) *os.File {
tb.Helper()
f, err := os.Create(name)
if err != nil {
tb.Fatal(err)
}
tb.Cleanup(func() { _ = f.Close() })
return f
}
// writeFileSpec is a helper function for writing a spec to a file.
func writeFileSpec(tb testing.TB, w io.Writer, spec *ltx.FileSpec) int64 {
tb.Helper()
n, err := spec.WriteTo(w)
if err != nil {
tb.Fatal(err)
}
return int64(n)
}
// readFileSpec is a helper function for reading a spec from a file.
func readFileSpec(tb testing.TB, r io.Reader, size int64) *ltx.FileSpec {
tb.Helper()
var spec ltx.FileSpec
if _, err := spec.ReadFrom(r); err != nil {
tb.Fatal(err)
}
return &spec
}
// compactFileSpecs compacts a set of file specs to a new spec.
func compactFileSpecs(tb testing.TB, inputs ...*ltx.FileSpec) (*ltx.FileSpec, error) {
tb.Helper()
// Write input specs to file.
wtrs := make([]io.Writer, len(inputs))
rdrs := make([]io.Reader, len(inputs))
for i, input := range inputs {
var buf bytes.Buffer
wtrs[i], rdrs[i] = &buf, &buf
writeFileSpec(tb, wtrs[i], input)
}
// Compact files together.
var output bytes.Buffer
c := ltx.NewCompactor(&output, rdrs)
if err := c.Compact(context.Background()); err != nil {
return nil, err
}
return readFileSpec(tb, &output, int64(output.Len())), nil
}
// assertFileSpecEqual checks x & y for equality. Fail on inequality.
func assertFileSpecEqual(tb testing.TB, x, y *ltx.FileSpec) {
tb.Helper()
if got, want := x.Header, y.Header; got != want {
tb.Fatalf("header mismatch:\ngot=%#v\nwant=%#v", got, want)
}
if got, want := len(x.Pages), len(y.Pages); got != want {
tb.Fatalf("page count: %d, want %d", got, want)
}
for i := range x.Pages {
if got, want := x.Pages[i].Header, y.Pages[i].Header; got != want {
tb.Fatalf("page header mismatch: i=%d\ngot=%#v\nwant=%#v", i, got, want)
}
if got, want := x.Pages[i].Data, y.Pages[i].Data; !bytes.Equal(got, want) {
tb.Fatalf("page data mismatch: i=%d\ngot=%#v\nwant=%#v", i, got, want)
}
}
if got, want := x.Trailer, y.Trailer; got != want {
tb.Fatalf("trailer mismatch:\ngot=%#v\nwant=%#v", got, want)
}
}