func dbGetProto(rdb *C.DBEngine, key MVCCKey,
msg proto.Message) (ok bool, keyBytes, valBytes int64, err error) {
if len(key.Key) == 0 {
err = emptyKeyError()
return
}
var result C.DBString
if err = statusToError(C.DBGet(rdb, goToCKey(key), &result)); err != nil {
return
}
if result.len <= 0 {
msg.Reset()
return
}
ok = true
if msg != nil {
// Make a byte slice that is backed by result.data. This slice
// cannot live past the lifetime of this method, but we're only
// using it to unmarshal the roachpb.
data := cSliceToUnsafeGoBytes(C.DBSlice(result))
err = proto.Unmarshal(data, msg)
}
C.free(unsafe.Pointer(result.data))
keyBytes = int64(key.EncodedSize())
valBytes = int64(result.len)
return
}
func (r *rocksDBBatch) GetProto(key proto.EncodedKey, msg gogoproto.Message) (
ok bool, keyBytes, valBytes int64, err error) {
if len(key) == 0 {
err = emptyKeyError()
return
}
var result C.DBString
if err = statusToError(C.DBBatchGet(r.parent.rdb, r.batch, goToCSlice(key), &result)); err != nil {
return
}
if result.len <= 0 {
return
}
ok = true
if msg != nil {
// Make a byte slice that is backed by result.data. This slice
// cannot live past the lifetime of this method, but we're only
// using it to unmarshal the proto.
data := cSliceToUnsafeGoBytes(C.DBSlice(result))
err = gogoproto.Unmarshal(data, msg)
}
C.free(unsafe.Pointer(result.data))
keyBytes = int64(len(key))
valBytes = int64(result.len)
return
}