zk onerror callback

@@ -67,16 +67,35 @@ const walkPath = (client, path, memory, cache) => {
     )
 };
 
-module.exports = (server, host, memory, cache) => {
+module.exports = (server, host, memory, cache, extra = {}) => {
     let client = zookeeper.createClient(server, {
-        retries: 3
+        spinDelay: 1000,
+        retries: 10
     });
 
+    client.state = Symbol();
+
     host = (host && _.indexOf(['pc', 'wap'], host) >= 0) ? host : 'wap';
 
-    client.once('connected', () => {
+    client.on('connected', () => {
         walkPath(client, `/${host}`, memory, cache)
     });
 
+    client.on('state', state => {
+        if (!extra || !extra.onerror) {
+            return;
+        }
+
+        switch (state) {
+            case zookeeper.State.DISCONNECTED:
+            case zookeeper.State.EXPIRED:
+            case zookeeper.State.AUTH_FAILED:
+                extra.onerror({...state});
+                break;
+            default:
+                return;
+        }
+    });
+
     client.connect();
 };