Implemented OrientDBClient#listDatabases

lib/client/client.js

@@ -229,6 +229,29 @@ class OrientDBClient extends EventEmitter {
     });
   }
 
+  /**
+   * List all the databases on the server.
+   * @param {Object} options Options object
+   * @param {String} options.username  Server user
+   * @param {String} options.password  Server password
+   * @returns {Promise<Array>}
+   */
+  listDatabases(options) {
+    return this._runAsAdmin(options, ctx => {
+      return ctx.conn
+        .send(
+          "db-list",
+          Object.assign({}, options, {
+            sessionId: ctx.sessionId,
+            token: ctx.token
+          })
+        )
+        .then(response => {
+          return response.databases;
+        });
+    });
+  }
+
   _runAsAdmin(options, work) {
     return new Promise((resolve, reject) => {
       let ctx = { options: options };