chore: add sync backoff mechanism checks (#2786)

packages/snjs/lib/Application/Dependencies/Dependencies.ts

@@ -145,6 +145,8 @@ import {
   IsVaultAdmin,
   IsReadonlyVaultMember,
   DesignateSurvivor,
+  SyncBackoffService,
+  SyncBackoffServiceInterface,
 } from '@standardnotes/services'
 import { ItemManager } from '../../Services/Items/ItemManager'
 import { PayloadManager } from '../../Services/Payloads/PayloadManager'
@@ -1351,6 +1353,10 @@ export class Dependencies {
       )
     })
 
+    this.factory.set(TYPES.SyncBackoffService, () => {
+      return new SyncBackoffService()
+    })
+
     this.factory.set(TYPES.SyncService, () => {
       return new SyncService(
         this.get<ItemManager>(TYPES.ItemManager),
@@ -1369,6 +1375,7 @@ export class Dependencies {
         this.get<Logger>(TYPES.Logger),
         this.get<WebSocketsService>(TYPES.WebSocketsService),
         this.get<SyncFrequencyGuardInterface>(TYPES.SyncFrequencyGuard),
+        this.get<SyncBackoffServiceInterface>(TYPES.SyncBackoffService),
         this.get<InternalEventBus>(TYPES.InternalEventBus),
       )
     })

packages/snjs/lib/Application/Dependencies/Types.ts

@@ -30,6 +30,7 @@ export const TYPES = {
   SubscriptionManager: Symbol.for('SubscriptionManager'),
   HistoryManager: Symbol.for('HistoryManager'),
   SyncFrequencyGuard: Symbol.for('SyncFrequencyGuard'),
+  SyncBackoffService: Symbol.for('SyncBackoffService'),
   SyncService: Symbol.for('SyncService'),
   ProtectionService: Symbol.for('ProtectionService'),
   UserService: Symbol.for('UserService'),

packages/snjs/lib/Services/Sync/SyncService.ts

@@ -86,6 +86,7 @@ import {
   ApplicationSyncOptions,
   WebSocketsServiceEvent,
   WebSocketsService,
+  SyncBackoffServiceInterface,
 } from '@standardnotes/services'
 import { OfflineSyncResponse } from './Offline/Response'
 import {
@@ -171,6 +172,7 @@ export class SyncService
     private logger: LoggerInterface,
     private sockets: WebSocketsService,
     private syncFrequencyGuard: SyncFrequencyGuardInterface,
+    private syncBackoffService: SyncBackoffServiceInterface,
     protected override internalEventBus: InternalEventBusInterface,
   ) {
     super(internalEventBus)
@@ -452,7 +454,11 @@ export class SyncService
   }
 
   private itemsNeedingSync() {
-    return this.itemManager.getDirtyItems()
+    const dirtyItems = this.itemManager.getDirtyItems()
+
+    const itemsWithoutBackoffPenalty = dirtyItems.filter((item) => !this.syncBackoffService.isItemInBackoff(item))
+
+    return itemsWithoutBackoffPenalty
   }
 
   public async markAllItemsAsNeedingSyncAndPersist(): Promise<void> {