func (s *Server) createShardReplication(sri *topo.ShardReplicationInfo) (int64, error) {
cell, err := s.getCell(sri.Cell())
if err != nil {
return -1, err
}
data := jscfg.ToJSON(sri.ShardReplication)
resp, err := cell.Create(shardReplicationFilePath(sri.Keyspace(), sri.Shard()),
data, 0 /* ttl */)
if err != nil {
return -1, convertError(err)
}
if resp.Node == nil {
return -1, ErrBadResponse
}
return int64(resp.Node.ModifiedIndex), nil
}
func (s *Server) updateShardReplication(sri *topo.ShardReplicationInfo, existingVersion int64) (int64, error) {
cell, err := s.getCell(sri.Cell())
if err != nil {
return -1, err
}
data := jscfg.ToJSON(sri.ShardReplication)
resp, err := cell.CompareAndSwap(shardReplicationFilePath(sri.Keyspace(), sri.Shard()),
data, 0 /* ttl */, "" /* prevValue */, uint64(existingVersion))
if err != nil {
return -1, convertError(err)
}
if resp.Node == nil {
return -1, ErrBadResponse
}
return int64(resp.Node.ModifiedIndex), nil
}