add type desc

README.md

@@ -2,13 +2,13 @@
 
 P2P communication lib in Go and based on IPFS. It supports Sub/Pub msg and file.   
 
-Why I create this?
+Why we create this?
 
-We need to build a world without AI, BigData. Human in this world respect each other's private info. No man analyze our data in the place we don't know.
+We need to build a world without AI, BigData. Human in this world should respect each other's private info. No man analyzes our data in the place we don't know.
 
 No one can pry into our personal life and trace any private things.
 
-So now you know, I hate the big companies hold all data of ours. 
+So now you know, We hate the big companies hold all data of ours. 
 
 ## Structure
 
@@ -30,7 +30,21 @@ Inspired by Go-Micro and Orbit-db.
 
 ### Node
 
-Node is the smallest indivisible unit for exchanging data in Peers. It includes `Transport`, `Broker`, `Store`, `Registry` for the outside and `Config`, `Logger` for the inside.
+Node is the smallest indivisible unit for exchanging data in peers-net. It includes `Transport`, `Broker`, `Store`, `Registry` for the outside and `Config`, `Logger` for the inside.
+
+See architecture as below:
+
+[todo]
+
+#### Types of Node
+
+- Relay Node: Gateway, nodes in public network logically. Helps other types nodes communicate within the bad network.
+
+- Terminal Node: Users' nodes.
+
+- Registry Node: Registry Center. Helps nodes look for others. 'Center' doesn't mean this kind of node is necessary. We use this for easy discovery.
+
+Types can be init at one node which means a node could have tree types. Those types run in one or multi-process. 
 
 # 中文
 
@@ -40,8 +54,8 @@ Node is the smallest indivisible unit for exchanging data in Peers. It includes
 
 - 节点类型
   - 中继节点：网关，公网节点，用于NAT节点之间的通信中继，不干涉与不猜测消息内容，透明但有条件（如安全、验证等）过桥传输
-  - 注册节点：公网节点，用于NAT节点的与中继节点的注册
   - 终端节点：不限网络的节点，数据的来源与最终去向
+  - 注册节点：公网节点，用于NAT节点中继节点的注册
 
 部分参考Go-Micro及Orbit-db的设计
 

node/option.go

@@ -8,12 +8,16 @@ import (
 )
 
 const (
-	TypeEnd Type = iota + 1
-	TypeRegistry
+	TypeEnd      = 1
+	TypeRegistry = iota * 2
 	TypeRelaying
 )
 
 const (
+	TypeAll = TypeEnd + TypeRegistry + TypeRelaying
+)
+
+var (
 	TypeDefault = TypeEnd
 )