From 93aae05e6381ced7ba52f7512de326f029ff3abe Mon Sep 17 00:00:00 2001
From: Meeeeow <me@async.sh>
Date: Sat, 19 Aug 2017 00:34:00 +0800
Subject: [PATCH] fix: :bug: check error code to prevent data loss

---
 src/lib/storage/local/local-data.js | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/lib/storage/local/local-data.js b/src/lib/storage/local/local-data.js
index 658c5b017..5c46ea081 100644
--- a/src/lib/storage/local/local-data.js
+++ b/src/lib/storage/local/local-data.js
@@ -2,6 +2,7 @@
 
 const fs = require('fs');
 const Path = require('path');
+const logger = require('../../logger');
 
 /**
  * Handle local database.
@@ -15,10 +16,28 @@ const Path = require('path');
    */
    constructor(path) {
     this.path = path;
+    let dbFile;
+
     try {
-      this.data = JSON.parse(fs.readFileSync(this.path, 'utf8'));
-    } catch(_) {
-      this.data = {list: []};
+      dbFile = fs.readFileSync(this.path, 'utf8');
+    } catch (err) {
+      if (err.code === 'ENOENT') { // Only recreate if file not found to prevent data loss
+        this.data = {list: []};
+      } else {
+        logger.logger.error(
+          'Failed to read package database file, please check the error printed below and fix it manually:\n',
+          `File Path: ${this.path}\n\n`,
+          err
+        );
+        throw new Error('Package database file unreachable');
+      }
+    }
+
+    try {
+      this.data = JSON.parse(dbFile);
+    } catch(err) {
+      logger.logger.error(err);
+      throw new Error(`Package database file corrupted (invalid JSON), please fix it manually.\nFile Path: ${this.path}`);
     }
   }