func doRange(kv dstorage.KV, r *pb.RangeRequest) *pb.RangeResponse {
resp := &pb.RangeResponse{}
resp.Header = &pb.ResponseHeader{}
kvs, rev, err := kv.Range(r.Key, r.RangeEnd, r.Limit, 0)
if err != nil {
panic("not handled error")
}
resp.Header.Revision = rev
for i := range kvs {
resp.Kvs = append(resp.Kvs, &kvs[i])
}
return resp
}
func doCompare(kv dstorage.KV, c *pb.Compare) (int64, bool) {
ckvs, rev, err := kv.Range(c.Key, nil, 1, 0)
if err != nil {
return rev, false
}
ckv := ckvs[0]
// -1 is less, 0 is equal, 1 is greater
var result int
switch c.Target {
case pb.Compare_VALUE:
result = bytes.Compare(ckv.Value, c.Value)
case pb.Compare_CREATE:
result = compareInt64(ckv.CreateRevision, c.CreateRevision)
case pb.Compare_MOD:
result = compareInt64(ckv.ModRevision, c.ModRevision)
case pb.Compare_VERSION:
result = compareInt64(ckv.Version, c.Version)
}
switch c.Result {
case pb.Compare_EQUAL:
if result != 0 {
return rev, false
}
case pb.Compare_GREATER:
if result != 1 {
return rev, false
}
case pb.Compare_LESS:
if result != -1 {
return rev, false
}
}
return rev, true
}