func (r *rdbReader) readLength() (uint32, error) {
length, encoded, err := r.readEncodedLength()
if err == nil && encoded {
err = errors.New("encoded-length")
}
return length, err
}
func (e *Encoder) EncodeObject(db uint32, key []byte, expireat uint64, obj interface{}) error {
o, ok := obj.(objectEncoder)
if !ok {
return errors.New("unsupported object type")
}
if e.db == -1 || uint32(e.db) != db {
e.db = int64(db)
if err := e.enc.EncodeDatabase(int(db)); err != nil {
return errors.Trace(err)
}
}
if expireat != 0 {
if err := e.enc.EncodeExpiry(expireat); err != nil {
return errors.Trace(err)
}
}
if err := o.encodeType(e.enc); err != nil {
return err
}
if err := e.enc.EncodeString(key); err != nil {
return errors.Trace(err)
}
if err := o.encodeValue(e.enc); err != nil {
return err
}
return nil
}
func (l *Loader) Footer() error {
crc1 := l.crc.Sum64()
if crc2, err := l.readUint64(); err != nil {
return err
} else if crc1 != crc2 {
return errors.New("checksum validation failed")
}
return nil
}
func (d *decoder) initObject(obj interface{}) {
if d.err != nil {
return
}
if d.obj != nil {
d.err = errors.New("invalid object, init again")
} else {
d.obj = obj
}
}
func (d *decoder) Rpush(key, value []byte) {
if d.err != nil {
return
}
switch l := d.obj.(type) {
default:
d.err = errors.New("invalid object, not a list")
case List:
d.obj = append(l, value)
}
}
func (d *decoder) Sadd(key, member []byte) {
if d.err != nil {
return
}
switch s := d.obj.(type) {
default:
d.err = errors.New("invalid object, not a set")
case Set:
d.obj = append(s, member)
}
}
func (d *decoder) Zadd(key []byte, score float64, member []byte) {
if d.err != nil {
return
}
switch z := d.obj.(type) {
default:
d.err = errors.New("invalid object, not a zset")
case ZSet:
v := &ZSetElement{Member: member, Score: score}
d.obj = append(z, v)
}
}
func (d *decoder) Hset(key, field, value []byte) {
if d.err != nil {
return
}
switch h := d.obj.(type) {
default:
d.err = errors.New("invalid object, not a hashmap")
case Hash:
v := &HashElement{Field: field, Value: value}
d.obj = append(h, v)
}
}
func ParseArgs(resp Resp) (cmd string, args [][]byte, err error) {
var array []Resp
if o, ok := resp.(*Array); !ok {
return "", nil, errors.Errorf("expect array, but got type = '%s'", resp.Type())
} else if o == nil || len(o.Value) == 0 {
return "", nil, errors.New("request is an empty array")
} else {
array = o.Value
}
slices := make([][]byte, 0, len(array))
for i, resp := range array {
if o, ok := resp.(*BulkBytes); !ok {
return "", nil, errors.Errorf("args[%d], expect bulkbytes, but got '%s'", i, resp.Type())
} else if i == 0 && len(o.Value) == 0 {
return "", nil, errors.New("command is empty")
} else {
slices = append(slices, o.Value)
}
}
return strings.ToLower(string(slices[0])), slices[1:], nil
}
func (l *Loader) Header() error {
header := make([]byte, 9)
if err := l.readFull(header); err != nil {
return err
}
if !bytes.Equal(header[:5], []byte("REDIS")) {
return errors.New("verify magic string, invalid file format")
}
if version, err := strconv.ParseInt(string(header[5:]), 10, 64); err != nil {
return errors.Trace(err)
} else if version <= 0 || version > Version {
return errors.Errorf("verify version, invalid RDB version number %d", version)
}
return nil
}
func EncodeDump(obj interface{}) ([]byte, error) {
o, ok := obj.(objectEncoder)
if !ok {
return nil, errors.New("unsupported object type")
}
var b bytes.Buffer
enc := rdb.NewEncoder(&b)
if err := o.encodeType(enc); err != nil {
return nil, err
}
if err := o.encodeValue(enc); err != nil {
return nil, err
}
if err := enc.EncodeDumpFooter(); err != nil {
return nil, errors.Trace(err)
}
return b.Bytes(), nil
}
