android: fixed once and on error handling

lib/modules/database/index.js

@@ -213,17 +213,41 @@ export default class Database extends Base {
   }
 
   /**
-   *
-   * @param err
+   * Converts an native error object to a 'firebase like' error.
+   * @param error
+   * @returns {Error}
    * @private
    */
-  _handleDatabaseError(err: Object) {
-    const body = err.body || {};
-    const { path, modifiersString, eventName, msg } = body;
-    const handle = this._handle(path, modifiersString);
+  _toFirebaseError(error) {
+    const { path, message, modifiers, code, details } = error;
+    let firebaseMessage = `FirebaseError: ${message}`;
 
-    this.log.debug('_handleDatabaseError ->', handle, eventName, err);
+    if (path) {
+      firebaseMessage = `${firebaseMessage}\r\nPath: /${path}\r\n`;
+    }
 
-    if (this.errorSubscriptions[handle]) this.errorSubscriptions[handle].forEach((cb) => cb(new Error(msg)));
+    const firebaseError = new Error(firebaseMessage);
+
+    firebaseError.code = code;
+    firebaseError.path = path;
+    firebaseError.details = details;
+    firebaseError.modifiers = modifiers;
+
+    return firebaseError;
+  }
+
+  /**
+   *
+   * @param error
+   * @private
+   */
+  _handleDatabaseError(error: Object = {}) {
+    const { path, modifiers } = error;
+    const handle = this._handle(path, modifiers);
+    const firebaseError = this._toFirebaseError(error);
+
+    this.log.debug('_handleDatabaseError ->', handle, 'database_error', error);
+
+    if (this.errorSubscriptions[handle]) this.errorSubscriptions[handle].forEach(listener => listener(firebaseError));
   }
 }