func create(f *os.File, filer lldb.Filer, opts *Options, isMem bool) (db *DB, err error) {
defer func() {
if db != nil {
db.opts = opts
}
}()
defer func() {
lock := opts.lock
if err != nil && lock != nil {
lock.Close()
db = nil
}
}()
if err = opts.check(filer.Name(), true, !isMem); err != nil {
return
}
b := [16]byte{byte(magic[0]), byte(magic[1]), byte(magic[2]), byte(magic[3]), 0x00} // ver 0x00
if n, err := filer.WriteAt(b[:], 0); n != 16 {
return nil, &os.PathError{Op: "kv.create.WriteAt", Path: filer.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
if err = filer.BeginUpdate(); err != nil {
return
}
defer func() {
if e := filer.EndUpdate(); e != nil {
if err == nil {
err = e
}
}
}()
if db.alloc, err = lldb.NewAllocator(lldb.NewInnerFiler(filer, 16), &lldb.Options{}); err != nil {
return nil, &os.PathError{Op: "kv.create", Path: filer.Name(), Err: err}
}
db.alloc.Compress = true
db.isMem = isMem
var h int64
if db.root, h, err = lldb.CreateBTree(db.alloc, opts.Compare); err != nil {
return
}
if h != 1 {
panic("internal error")
}
db.wal = opts.wal
return
}
func open00(name string, in *DB) (db *DB, err error) {
db = in
if db.alloc, err = lldb.NewAllocator(lldb.NewInnerFiler(db.filer, 16), &lldb.Options{}); err != nil {
return nil, &os.PathError{Op: "kv.open00", Path: name, Err: err}
}
db.alloc.Compress = true
return db, db.boot()
}
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 create(f *os.File, filer lldb.Filer, opts *Options, isMem bool) (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 = opts.check(filer.Name(), true, !isMem); err != nil {
return
}
b := [16]byte{byte(magic[0]), byte(magic[1]), byte(magic[2]), byte(magic[3]), 0x00} // ver 0x00
if n, err := filer.WriteAt(b[:], 0); n != 16 {
return nil, &os.PathError{Op: "dbm.Create.WriteAt", Path: filer.Name(), Err: err}
}
db = &DB{emptySize: 128, f: f, lock: opts.lock, closed: make(chan bool)}
if filer, err = opts.acidFiler(db, filer); err != nil {
return nil, err
}
db.filer = filer
if err = filer.BeginUpdate(); err != nil {
return
}
defer func() {
if e := filer.EndUpdate(); e != nil {
if err == nil {
err = e
}
}
}()
if db.alloc, err = lldb.NewAllocator(lldb.NewInnerFiler(filer, 16), &lldb.Options{}); err != nil {
return nil, &os.PathError{Op: "dbm.Create", Path: filer.Name(), Err: err}
}
db.alloc.Compress = compress
db.isMem = isMem
return db, db.boot()
}