NewClient returns a wrapped etcd client.

NewClientFromCfg returns a wrapped etcd client.

SetEtcdCliByNamespace is used to add an etcd namespace prefix before etcd path.

CreateOp is create operation type.

DeleteOp is delete operation type.

UpdateOp is update operation type.

Client is a wrapped etcd client that support some simple method.

Node organizes the ectd query result as a Trie tree.

Operation represents an operation in etcd, include create, update and delete.

OpType is operation's type in etcd.