3 // persistent key-value store
4 // multiple key-value store can be managed by a single db connection
5 // each store has a name, before usage the name of the store must be
8 // TODO: this is a toy implementation
20 func Open(root string) (c *Conn, err error) {
22 c.path, err = filepath.Abs(root)
26 err = os.MkdirAll(c.path, 0755)
33 func (c *Conn) Get(name, k string) (v []byte, err error) {
34 return ioutil.ReadFile(filepath.Join(c.path, name, k))
37 func (c *Conn) Ensure(name string) (err error) {
38 return os.MkdirAll(filepath.Join(c.path, name), 0755)
41 func (c *Conn) Set(name, k string, v []byte) (err error) {
42 fn := filepath.Join(c.path, name, k)
43 f, err := os.OpenFile(fn+".tmp", os.O_CREATE|os.O_TRUNC|os.O_WRONLY|os.O_SYNC, 0666)
52 err = os.Rename(fn+".tmp", fn)
56 func (c *Conn) Append(name, k string, v []byte) (err error) {
57 fn := filepath.Join(c.path, name, k)
58 f, err := os.OpenFile(fn, os.O_CREATE|os.O_APPEND|os.O_WRONLY|os.O_SYNC, 0666)
67 func (c *Conn) Close() (err error) {