diff --git a/lib/db.js b/lib/db.js
index a1fe32c..c967f63 100644
--- a/lib/db.js
+++ b/lib/db.js
@@ -1,13 +1,27 @@
-const Tapable = require('tapable')
+const Tapable = require("tapable");
 
 class DB extends Tapable {
   constructor() {
     // TODO
+    super();
+    this.options = options || {};
   }
 
   request() {
     // TODO
+    options && Object.assign(this.options, options);
+    this.applyPlugins("options", this.options);
+    const opt = this.applyPluginsWaterfall("options", this.options);
+    return this.applyPluginsBailResult("endpoint", opt)
+      .then((res) => {
+        if (this.applyPluginsBailResult("judge", res)) {
+          return Promise.reject(res);
+        } else {
+          return Promise.resolve(res);
+        }
+      })
+      .catch((error) => Promise.reject(error));
   }
 }
 
-module.exports = DB
\ No newline at end of file
+module.exports = DB;