func (s *file) CreateTemp(asc bool) (bt temp, err error) {
f, err := ioutil.TempFile("", "ql-tmp-")
if err != nil {
return nil, err
}
fn := f.Name()
filer := lldb.NewSimpleFileFiler(f)
a, err := lldb.NewAllocator(filer, &lldb.Options{})
if err != nil {
f.Close()
os.Remove(fn)
return nil, err
}
t, _, err := lldb.CreateBTree(a, lldbCollators[asc])
if err != nil {
f.Close()
os.Remove(fn)
return nil, err
}
return &fileTemp{
a: a,
f: f,
t: t,
}, nil
}
// Open opens the named DB file for reading/writing. If successful, methods on
// the returned DB can be used for I/O; the associated file descriptor has mode
// os.O_RDWR. If there is an error, it will be of type *os.PathError.
//
// For the meaning of opts please see documentation of Options.
func Open(name string, opts *Options) (db *DB, err error) {
defer func() {
lock := opts.lock
if err != nil && lock != nil {
n := lock.Name()
lock.Close()
os.Remove(n)
db = nil
}
if err != nil {
if db != nil {
db.Close()
db = nil
}
}
}()
if err = opts.check(name, false, true); err != nil {
return
}
f, err := os.OpenFile(name, os.O_RDWR, 0666)
if err != nil {
return
}
filer := lldb.Filer(lldb.NewSimpleFileFiler(f))
sz, err := filer.Size()
if err != nil {
return
}
if sz%16 != 0 {
return nil, &os.PathError{Op: "dbm.Open:", Path: name, Err: fmt.Errorf("file size %d(%#x) is not 0 (mod 16)", sz, sz)}
}
var b [16]byte
if n, err := filer.ReadAt(b[:], 0); n != 16 || err != nil {
return nil, &os.PathError{Op: "dbm.Open.ReadAt", Path: name, Err: err}
}
var h header
if err = h.rd(b[:]); err != nil {
return nil, &os.PathError{Op: "dbm.Open:validate header", Path: name, Err: err}
}
db = &DB{f: f, lock: opts.lock, closed: make(chan bool)}
if filer, err = opts.acidFiler(db, filer); err != nil {
return nil, err
}
db.filer = filer
switch h.ver {
default:
return nil, &os.PathError{Op: "dbm.Open", Path: name, Err: fmt.Errorf("unknown dbm file format version %#x", h.ver)}
case 0x00:
return open00(name, db)
}
}
func fillseq() {
dbname := os.Args[0] + ".db"
f, err := os.OpenFile(dbname, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666)
if err != nil {
log.Fatal(err)
}
defer func() {
f.Close()
os.Remove(f.Name())
}()
filer := lldb.NewSimpleFileFiler(f)
a, err := lldb.NewAllocator(filer, &lldb.Options{})
if err != nil {
log.Println(err)
return
}
a.Compress = true
b, _, err := lldb.CreateBTree(a, nil)
if err != nil {
log.Println(err)
return
}
var keys [N][16]byte
for i := range keys {
binary.BigEndian.PutUint32(keys[i][:], uint32(i))
}
debug.FreeOSMemory()
t0 := time.Now()
for _, key := range keys {
if err = b.Set(key[:], value100); err != nil {
log.Println(err)
return
}
}
if err := filer.Sync(); err != nil {
log.Println(err)
return
}
var ms runtime.MemStats
runtime.ReadMemStats(&ms)
d := time.Since(t0)
fi, err := f.Stat()
if err != nil {
log.Println(err)
return
}
secs := float64(d/time.Nanosecond) / float64(time.Second)
sz := fi.Size()
fmt.Printf("fillseq :%19v/op;%7.1f MB/s (%g secs, %d bytes)\n", d/N, float64(sz)/secs/1e6, secs, sz)
nn, bytes := bufs.GCache.Stats()
fmt.Printf("%d %d\n", nn, bytes)
fmt.Printf("%+v\n", ms)
}
// Verify attempts to find any structural errors in DB wrt the organization of
// it as defined by lldb.Allocator. 'bitmap' is a scratch pad for necessary
// bookkeeping and will grow to at most to DB size/128 (0,78%). Any problems
// found are reported to 'log' except non verify related errors like disk read
// fails etc. If 'log' returns false or the error doesn't allow to (reliably)
// continue, the verification process is stopped and an error is returned from
// the Verify function. Passing a nil log works like providing a log function
// always returning false. Any non-structural errors, like for instance Filer
// read errors, are NOT reported to 'log', but returned as the Verify's return
// value, because Verify cannot proceed in such cases. Verify returns nil only
// if it fully completed verifying DB without detecting any error.
//
// It is recommended to limit the number reported problems by returning false
// from 'log' after reaching some limit. Huge and corrupted DB can produce an
// overwhelming error report dataset.
//
// The verifying process will scan the whole DB at least 3 times (a trade
// between processing space and time consumed). It doesn't read the content of
// free blocks above the head/tail info bytes. If the 3rd phase detects lost
// free space, then a 4th scan (a faster one) is performed to precisely report
// all of them.
//
// Statistics are returned via 'stats' if non nil. The statistics are valid
// only if Verify succeeded, ie. it didn't reported anything to log and it
// returned a nil error.
func (db *DB) Verify(log func(error) bool, stats *lldb.AllocStats) (err error) {
bitmapf, err := fileutil.TempFile(".", "verifier", ".tmp")
if err != nil {
return
}
defer func() {
tn := bitmapf.Name()
bitmapf.Close()
os.Remove(tn)
}()
bitmap := lldb.NewSimpleFileFiler(bitmapf)
if err = db.enter(); err != nil {
return
}
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("%v", e)
}
db.leave(&err)
}()
return db.alloc.Verify(bitmap, log, stats)
}
// Create creates the named DB file mode 0666 (before umask). The file must not
// already exist. If successful, methods on the returned DB can be used for
// I/O; the associated file descriptor has mode os.O_RDWR. If there is an
// error, it will be of type *os.PathError.
//
// For the meaning of opts please see documentation of Options.
func Create(name string, opts *Options) (db *DB, err error) {
f, err := os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
if err != nil {
return
}
return create(f, lldb.NewSimpleFileFiler(f), opts, false)
}
// Open opens the named DB file for reading/writing. If successful, methods on
// the returned DB can be used for I/O; the associated file descriptor has mode
// os.O_RDWR. If there is an error, it will be of type *os.PathError.
//
// Note: While a DB is opened, it is locked and cannot be simultaneously opened
// again.
//
// For the meaning of opts please see documentation of Options.
func Open(name string, opts *Options) (db *DB, err error) {
f, err := os.OpenFile(name, os.O_RDWR, 0666)
if err != nil {
return nil, err
}
return OpenFromFiler(lldb.NewSimpleFileFiler(f), opts)
}
// CreateTemp creates a new temporary DB in the directory dir with a basename
// beginning with prefix and name ending in suffix. If dir is the empty string,
// CreateTemp uses the default directory for temporary files (see os.TempDir).
// Multiple programs calling CreateTemp simultaneously will not choose the same
// file name for the DB. The caller can use Name() to find the pathname of the
// DB file. It is the caller's responsibility to remove the file when no longer
// needed.
//
// For the meaning of opts please see documentation of Options.
func CreateTemp(dir, prefix, suffix string, opts *Options) (db *DB, err error) {
f, err := fileutil.TempFile(dir, prefix, suffix)
if err != nil {
return
}
return create(f, lldb.NewSimpleFileFiler(f), opts, false)
}
// Create creates the named DB file mode 0666 (before umask). The file must not
// already exist. If successful, methods on the returned DB can be used for
// I/O; the associated file descriptor has mode os.O_RDWR. If there is an
// error, it will be of type *os.PathError.
//
// For the meaning of opts please see documentation of Options.
func Create(name string, opts *Options) (db *DB, err error) {
opts = opts.clone()
opts._ACID = _ACIDFull
f, err := os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
if err != nil {
return
}
return CreateFromFiler(lldb.NewSimpleFileFiler(f), opts)
}
// CreateTemp creates a new temporary DB in the directory dir with a basename
// beginning with prefix and name ending in suffix. If dir is the empty string,
// CreateTemp uses the default directory for temporary files (see os.TempDir).
// Multiple programs calling CreateTemp simultaneously will not choose the same
// file name for the DB. The caller can use Name() to find the pathname of the
// DB file. It is the caller's responsibility to remove the file when no longer
// needed.
//
// For the meaning of opts please see documentation of Options.
func CreateTemp(dir, prefix, suffix string, opts *Options) (db *DB, err error) {
opts = opts.clone()
opts._ACID = _ACIDFull
f, err := fileutil.TempFile(dir, prefix, suffix)
if err != nil {
return
}
return create(lldb.NewSimpleFileFiler(f), opts, false)
}
func verifyAllocator(a *lldb.Allocator) error {
bits, err := ioutil.TempFile("", "kv-verify-")
if err != nil {
return err
}
defer func() {
nm := bits.Name()
bits.Close()
os.Remove(nm)
}()
var lerr error
if err = a.Verify(
lldb.NewSimpleFileFiler(bits),
func(err error) bool {
lerr = err
return false
},
nil,
); err != nil {
return err
}
if lerr != nil {
return lerr
}
t, err := lldb.OpenBTree(a, nil, 1)
if err != nil {
return err
}
e, err := t.SeekFirst()
if err != nil {
if err == io.EOF {
err = nil
}
return err
}
for {
_, _, err := e.Next()
if err != nil {
if err == io.EOF {
err = nil
}
return err
}
}
}
func TestProf(t *testing.T) {
dbname := os.Args[0] + ".db"
f, err := os.OpenFile(dbname, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666)
if err != nil {
t.Fatal(err)
}
defer func() {
f.Close()
os.Remove(f.Name())
}()
filer := lldb.NewSimpleFileFiler(f) // file
//filer := lldb.NewMemFiler() // mem
a, err := lldb.NewAllocator(filer, &lldb.Options{})
if err != nil {
t.Error(err)
return
}
a.Compress = true
b, _, err := lldb.CreateBTree(a, nil)
if err != nil {
t.Error(err)
return
}
var key [16]byte
for i := uint32(0); int(i) < 1e6; i++ {
binary.BigEndian.PutUint32(key[:], i)
if err = b.Set(key[:], value100); err != nil {
t.Error(err)
return
}
}
var ms runtime.MemStats
runtime.ReadMemStats(&ms)
bufsU, bufsT, bytesU, bytesT, h, m := a.CacheStats()
const p = 100.0
t.Logf(
"cache: buffers %d/%d(%.1f%%), bytes %d/%d(%.1f%%), hits %d(%.1f%%), misses %d(%.1f%%)",
bufsU, bufsT, p*float64(bufsU)/float64(bufsT),
bytesU, bytesT, p*float64(bytesU)/float64(bytesT),
h, p*float64(h)/float64(h+m),
m, p*float64(m)/float64(h+m),
)
nn, bts := bufs.GCache.Stats()
t.Logf("bufs.GCache.Stats() {%d, %d}", nn, bts)
t.Logf("%+v\n", ms)
}
func verifyDbFile(fn string) error {
f, err := os.Open(fn) // O_RDONLY
if err != nil {
return err
}
defer f.Close()
a, err := lldb.NewAllocator(lldb.NewInnerFiler(lldb.NewSimpleFileFiler(f), 16), &lldb.Options{})
if err != nil {
return err
}
return verifyAllocator(a)
}
func BenchmarkMem(b *testing.B) {
f, err := ioutil.TempFile("", "")
if err != nil {
b.Fatal(err)
}
defer func() {
f.Close()
os.Remove(f.Name())
}()
filer := lldb.NewSimpleFileFiler(f)
a, err := lldb.NewAllocator(filer, &lldb.Options{})
if err != nil {
b.Error(err)
return
}
a.Compress = true
t, _, err := lldb.CreateBTree(a, nil)
if err != nil {
b.Error(err)
return
}
b.ResetTimer()
var key [16]byte
for i := uint32(0); int(i) < b.N; i++ {
binary.BigEndian.PutUint32(key[:], i)
if err = t.Set(key[:], value100); err != nil {
b.Error(err)
return
}
}
if err := filer.Sync(); err != nil {
b.Error(err)
return
}
}
func main0(fn string, oMax int, w func(s string, a ...interface{}), oStat bool, first, last string, dump bool, oBuckets bool) error {
f, err := os.Open(fn) // O_RDONLY
if err != nil {
return err
}
defer f.Close()
bits, err := ioutil.TempFile("", "kvaudit-")
if err != nil {
return err
}
defer func() {
nm := bits.Name()
bits.Close()
os.Remove(nm)
}()
a, err := lldb.NewAllocator(lldb.NewInnerFiler(lldb.NewSimpleFileFiler(f), 16), &lldb.Options{})
if err != nil {
return err
}
cnt := 0
var stats lldb.AllocStats
err = a.Verify(lldb.NewSimpleFileFiler(bits), func(err error) bool {
cnt++
w("%d: %v\n", cnt, err)
return cnt < oMax
}, &stats)
if err != nil {
return err
}
if oStat {
w("Handles %10d // total valid handles in use\n", stats.Handles)
w("Compression %10d // number of compressed blocks\n", stats.Compression)
w("TotalAtoms %10d // total number of atoms == AllocAtoms + FreeAtoms\n", stats.TotalAtoms)
w("AllocBytes %10d // bytes allocated (after decompression, if/where used)\n", stats.AllocBytes)
w("AllocAtoms %10d // atoms allocated/used, including relocation atoms\n", stats.AllocAtoms)
w("Relocations %10d // number of relocated used blocks\n", stats.Relocations)
w("FreeAtoms %10d // atoms unused\n", stats.FreeAtoms)
}
if oBuckets {
var alloc, free [14]int64
sizes := [14]int64{1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 4112}
for atoms, cnt := range stats.AllocMap {
if atoms >= 4096 {
alloc[13] += cnt
continue
}
for i := range sizes {
if sizes[i+1] > atoms {
alloc[i] += cnt
break
}
}
}
for atoms, cnt := range stats.FreeMap {
if atoms > 4096 {
free[13] += cnt
continue
}
for i := range sizes {
if sizes[i+1] > atoms {
free[i] += cnt
break
}
}
}
w("Alloc blocks\n")
for i, v := range alloc {
w("%4d: %10d\n", sizes[i], v)
}
w("Free blocks\n")
for i, v := range free {
w("%4d: %10d\n", sizes[i], v)
}
}
if !(first != "" || last != "" || dump) {
return nil
}
t, err := lldb.OpenBTree(a, nil, 1)
if err != nil {
return err
}
dw := bufio.NewWriter(os.Stdout)
defer dw.Flush()
var e *lldb.BTreeEnumerator
switch {
case first != "":
e, _, err = t.Seek([]byte(first))
default:
e, err = t.SeekFirst()
}
if err != nil {
if err == io.EOF {
err = nil
}
return err
}
blast := []byte(last)
sep := []byte("->")
for {
k, v, err := e.Next()
if err != nil {
if err == io.EOF {
err = nil
}
return err
}
dw.WriteString(fmt.Sprintf("+%d,%d:", len(k), len(v)))
dw.Write(k)
dw.Write(sep)
dw.Write(v)
dw.WriteByte('\n')
if len(blast) != 0 && bytes.Compare(k, blast) >= 0 {
break
}
}
return nil
}
func newFileFromFile(f *os.File, simple bool) (fi *file, err error) {
nm := lockName(f.Name())
lck, err := lock.Lock(nm)
if err != nil {
if lck != nil {
lck.Close()
}
return nil, err
}
close := true
defer func() {
if close && lck != nil {
lck.Close()
}
}()
var w *os.File
closew := false
if !simple {
wn := walName(f.Name())
w, err = os.OpenFile(wn, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666)
closew = true
defer func() {
if closew {
nm := w.Name()
w.Close()
os.Remove(nm)
w = nil
}
}()
if err != nil {
if !os.IsExist(err) {
return nil, err
}
closew = false
w, err = os.OpenFile(wn, os.O_RDWR, 0666)
if err != nil {
return nil, err
}
closew = true
st, err := w.Stat()
if err != nil {
return nil, err
}
if st.Size() != 0 {
return nil, fmt.Errorf("non empty WAL file %s exists", wn)
}
}
}
info, err := f.Stat()
if err != nil {
return nil, err
}
switch sz := info.Size(); {
case sz == 0:
b := make([]byte, 16)
copy(b, []byte(magic))
if _, err := f.Write(b); err != nil {
return nil, err
}
filer := lldb.Filer(lldb.NewSimpleFileFiler(f))
filer = lldb.NewInnerFiler(filer, 16)
switch simple {
case true:
f0 := filer
if filer, err = lldb.NewRollbackFiler(
filer,
func(sz int64) error {
return f0.Truncate(sz)
},
f0,
); err != nil {
return nil, err
}
default:
if filer, err = lldb.NewACIDFiler(filer, w); err != nil {
return nil, err
}
}
a, err := lldb.NewAllocator(filer, &lldb.Options{})
if err != nil {
return nil, err
}
a.Compress = true
s := &file{
a: a,
f0: f,
f: filer,
lck: lck,
name: f.Name(),
wal: w,
}
if err = s.BeginTransaction(); err != nil {
return nil, err
}
h, err := s.Create()
if err != nil {
return nil, err
}
if h != 1 { // root
log.Panic("internal error")
}
if h, err = s.a.Alloc(make([]byte, 8)); err != nil {
return nil, err
}
if h != 2 { // id
log.Panic("internal error")
}
close, closew = false, false
return s, s.Commit()
default:
b := make([]byte, 16)
if _, err := f.Read(b); err != nil {
return nil, err
}
if string(b[:len(magic)]) != magic {
return nil, fmt.Errorf("unknown file format")
}
filer := lldb.Filer(lldb.NewSimpleFileFiler(f))
filer = lldb.NewInnerFiler(filer, 16)
switch simple {
case true:
f0 := filer
if filer, err = lldb.NewRollbackFiler(
filer,
func(sz int64) error {
return f0.Truncate(sz)
},
f0,
); err != nil {
return nil, err
}
default:
if filer, err = lldb.NewACIDFiler(filer, w); err != nil {
return nil, err
}
}
a, err := lldb.NewAllocator(filer, &lldb.Options{})
if err != nil {
return nil, err
}
bid, err := a.Get(nil, 2) // id
if err != nil {
return nil, err
}
if len(bid) != 8 {
return nil, fmt.Errorf("corrupted id |% x|", bid)
}
id := int64(0)
for _, v := range bid {
id = (id << 8) | int64(v)
}
a.Compress = true
s := &file{
a: a,
f0: f,
f: filer,
id: id,
lck: lck,
name: f.Name(),
wal: w,
}
close, closew = false, false
return s, nil
}
}
func main0(fn string, oMax int, w func(s string, a ...interface{}), oStat bool, first, last string, dump bool) error {
f, err := os.Open(fn) // O_RDONLY
if err != nil {
return err
}
defer f.Close()
bits, err := ioutil.TempFile("", "kvaudit-")
if err != nil {
return err
}
defer bits.Close()
a, err := lldb.NewAllocator(lldb.NewInnerFiler(lldb.NewSimpleFileFiler(f), 16), &lldb.Options{})
if err != nil {
return err
}
cnt := 0
var stats lldb.AllocStats
err = a.Verify(lldb.NewSimpleFileFiler(bits), func(err error) bool {
cnt++
w("%d: %v\n", cnt, err)
return cnt < oMax
}, &stats)
if oStat {
w("%#v\n", &stats)
}
if err != nil {
return err
}
if !(first != "" || last != "" || dump) {
return nil
}
t, err := lldb.OpenBTree(a, nil, 1)
if err != nil {
return err
}
dw := bufio.NewWriter(os.Stdout)
defer dw.Flush()
var e *lldb.BTreeEnumerator
switch {
case first != "":
e, _, err = t.Seek([]byte(first))
default:
e, err = t.SeekFirst()
}
if err != nil {
if err == io.EOF {
err = nil
}
return err
}
blast := []byte(last)
sep := []byte("->")
for {
k, v, err := e.Next()
if err != nil {
if err == io.EOF {
err = nil
}
return err
}
dw.WriteString(fmt.Sprintf("+%d,%d:", len(k), len(v)))
dw.Write(k)
dw.Write(sep)
dw.Write(v)
dw.WriteByte('\n')
if len(blast) != 0 && bytes.Compare(k, blast) >= 0 {
break
}
}
return nil
}
// Open opens the named DB file for reading/writing. If successful, methods on
// the returned DB can be used for I/O; the associated file descriptor has mode
// os.O_RDWR. If there is an error, it will be of type *os.PathError.
//
// Note: While a DB is opened, it is locked and cannot be simultaneously opened
// again.
//
// For the meaning of opts please see documentation of Options.
func Open(name string, opts *Options) (db *DB, err error) {
opts = opts.clone()
opts._ACID = _ACIDFull
defer func() {
if db != nil {
db.opts = opts
}
}()
defer func() {
lock := opts.lock
if err != nil && lock != nil {
lock.Close()
db = nil
}
if err != nil {
if db != nil {
db.Close()
db = nil
}
}
}()
if err = opts.check(name, false, true); err != nil {
return
}
f, err := os.OpenFile(name, os.O_RDWR, 0666)
if err != nil {
return
}
filer := lldb.Filer(lldb.NewSimpleFileFiler(f))
sz, err := filer.Size()
if err != nil {
return
}
if sz%16 != 0 {
return nil, &os.PathError{Op: "kv.Open:", Path: name, Err: fmt.Errorf("file size %d(%#x) is not 0 (mod 16)", sz, sz)}
}
var b [16]byte
if n, err := filer.ReadAt(b[:], 0); n != 16 || err != nil {
return nil, &os.PathError{Op: "kv.Open.ReadAt", Path: name, Err: err}
}
var h header
if err = h.rd(b[:]); err != nil {
return nil, &os.PathError{Op: "kv.Open:validate header", Path: name, Err: err}
}
db = &DB{f: f, lock: opts.lock}
if filer, err = opts.acidFiler(db, filer); err != nil {
return nil, err
}
db.filer = filer
switch h.ver {
default:
return nil, &os.PathError{Op: "kv.Open", Path: name, Err: fmt.Errorf("unknown/unsupported kv file format version %#x", h.ver)}
case 0x00:
if _, err = open00(name, db); err != nil {
return nil, err
}
}
db.root, err = lldb.OpenBTree(db.alloc, opts.Compare, 1)
db.wal = opts.wal
if opts.VerifyDbAfterOpen {
err = verifyAllocator(db.alloc)
}
return
}
