added sync mutex for consistency checks and backup

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "trilium",
-  "version": "0.0.1",
+  "version": "0.2.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -333,6 +333,11 @@
       "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
       "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg=="
     },
+    "async-mutex": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/async-mutex/-/async-mutex-0.1.3.tgz",
+      "integrity": "sha1-Cq0hEjaXlas/F+M3RFVtLs9UdWY="
+    },
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -2909,15 +2914,6 @@
         }
       }
     },
-    "electron-search-text": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/electron-search-text/-/electron-search-text-0.3.0.tgz",
-      "integrity": "sha1-7/B6qelfmzeDqTGXNiyL43iKPT0=",
-      "requires": {
-        "eventemitter2": "2.2.2",
-        "lodash": "4.17.4"
-      }
-    },
     "electron-to-chromium": {
       "version": "1.3.27",
       "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.27.tgz",
@@ -3535,11 +3531,6 @@
         "es5-ext": "0.10.35"
       }
     },
-    "eventemitter2": {
-      "version": "2.2.2",
-      "resolved": "https://registry.npmjs.org/eventemitter2/-/eventemitter2-2.2.2.tgz",
-      "integrity": "sha1-QH6nHCAgzVdTggOrfnpr3Pt2ktU="
-    },
     "execa": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/execa/-/execa-0.7.0.tgz",

package.json

@@ -2,6 +2,11 @@
   "name": "trilium",
   "description": "Trilium Notes",
   "version": "0.2.2",
+  "license": "AGPL-3.0-only",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/zadam/trilium.git"
+  },
   "scripts": {
     "start": "node ./bin/www",
     "test-electron": "xo",
@@ -14,6 +19,7 @@
     "publish-forge": "electron-forge publish"
   },
   "dependencies": {
+    "async-mutex": "^0.1.3",
     "body-parser": "~1.18.2",
     "cookie-parser": "~1.4.3",
     "debug": "~3.1.0",

routes/api/notes_move.js

@@ -190,7 +190,7 @@ async function validateParentChild(res, parentNoteId, childNoteId, noteTreeId =
     if (existing && (noteTreeId === null || existing.note_tree_id !== noteTreeId)) {
         res.send({
             success: false,
-            message: 'This note already exists in target parent note.'
+            message: 'This note already exists in the target.'
         });
 
         return false;

services/backup.js

@@ -6,6 +6,7 @@ const fs = require('fs-extra');
 const dataDir = require('./data_dir');
 const log = require('./log');
 const sql = require('./sql');
+const sync_mutex = require('./sync_mutex');
 
 async function regularBackup() {
     const now = new Date();
@@ -21,6 +22,10 @@ async function regularBackup() {
 }
 
 async function backupNow() {
+    // we don't want to backup DB in the middle of sync with potentially inconsistent DB state
+    const releaseMutex = await sync_mutex.acquire();
+
+    try {
         const now = utils.nowDate();
 
         const backupFile = dataDir.BACKUP_DIR + "/" + "backup-" + utils.getDateTimeForFile() + ".db";
@@ -32,6 +37,10 @@ async function backupNow() {
         await sql.doInTransaction(async () => {
             await options.setOption('last_backup_date', now);
         });
+    }
+    finally {
+        releaseMutex();
+    }
 }
 
 async function cleanupOldBackups() {

services/consistency_checks.js

@@ -3,6 +3,7 @@
 const sql = require('./sql');
 const log = require('./log');
 const messaging = require('./messaging');
+const sync_mutex = require('./sync_mutex');
 
 async function runCheck(query, errorText, errorList) {
     const result = await sql.getFirstColumn(query);
@@ -80,11 +81,9 @@ async function runSyncRowChecks(table, key, errorList) {
         `Missing ${table} records for existing sync rows`, errorList);
 }
 
-async function runChecks() {
+async function runAllChecks() {
     const errorList = [];
 
-    const startTime = new Date();
-
     await runCheck(`
           SELECT 
             note_id 
@@ -139,7 +138,7 @@ async function runChecks() {
           WHERE
             (SELECT COUNT(*) FROM notes_tree WHERE notes.note_id = notes_tree.note_id AND notes_tree.is_deleted = 0) = 0
             AND notes.is_deleted = 0
-    `, );
+    `,);
 
     await runCheck(`
           SELECT 
@@ -186,7 +185,24 @@ async function runChecks() {
         await checkTreeCycles(errorList);
     }
 
-    const elapsedTimeMs = new Date().getTime() - startTime.getTime();
+    return errorList;
+}
+
+async function runChecks() {
+    let errorList;
+    let elapsedTimeMs;
+    const releaseMutex = await sync_mutex.acquire();
+
+    try {
+        const startTime = new Date();
+
+        errorList = await runAllChecks();
+
+        elapsedTimeMs = new Date().getTime() - startTime.getTime();
+    }
+    finally {
+        releaseMutex();
+    }
 
     if (errorList.length > 0) {
         log.info(`Consistency checks failed (took ${elapsedTimeMs}ms) with these errors: ` + JSON.stringify(errorList));

services/sync.js

@@ -14,22 +14,13 @@ const fs = require('fs');
 const app_info = require('./app_info');
 const messaging = require('./messaging');
 const sync_setup = require('./sync_setup');
+const sync_mutex = require('./sync_mutex');
 
-let syncInProgress = false;
 let proxyToggle = true;
 let syncServerCertificate = null;
 
 async function sync() {
-    if (syncInProgress) {
+    const releaseMutex = await sync_mutex.acquire();
-        log.info("Sync already in progress");
-
-        return {
-            success: false,
-            message: "Sync already in progress"
-        };
-    }
-
-    syncInProgress = true;
 
     try {
         if (!await sql.isDbUpToDate()) {
@@ -74,7 +65,7 @@ async function sync() {
         }
     }
     finally {
-        syncInProgress = false;
+        releaseMutex();
     }
 }
 

services/sync_mutex.js

@@ -0,0 +1,8 @@
+/**
+ * Sync makes process can make data intermittently inconsistent. Processes which require strong data consistency
+ * (like consistency checks) can use this mutex to make sure sync isn't currently running.
+ */
+
+const Mutex = require('async-mutex').Mutex;
+
+module.exports = new Mutex();