Only cancel syncs for non-existent accounts

updateRunningAccountsH() should check syncs against all accounts
on the device, not only running accounts.

Also add code to restore wrongly-canceled periodic syncs, saving
users from a bad state where the only alternative is to remove and
readd affected accounts.

Bug: 27733283
Change-Id: I96bce87571c3b7c6cd1934cc967f11257f891f55

services/core/java/com/android/server/content/SyncManager.java

@@ -1402,12 +1402,24 @@ public class SyncManager {
         }
     }
 
+    private void restoreLostPeriodicSyncsIfNeeded(int userId) {
+        List<SyncOperation> periodicSyncs = new ArrayList<SyncOperation>();
+        for (SyncOperation sync : getAllPendingSyncs()) {
+            if (sync.isPeriodic && sync.target.userId == userId) {
+                periodicSyncs.add(sync);
+            }
+        }
+        mSyncStorageEngine.restorePeriodicSyncsIfNeededForUser(userId, periodicSyncs);
+    }
+
     private void onUserUnlocked(int userId) {
         // Make sure that accounts we're about to use are valid.
         AccountManagerService.getSingleton().validateAccounts(userId);
 
         mSyncAdapters.invalidateCache(userId);
 
+        restoreLostPeriodicSyncsIfNeeded(userId);
+
         EndPoint target = new EndPoint(null, null, userId);
         updateRunningAccounts(target);
 
@@ -2578,9 +2590,11 @@ public class SyncManager {
                 }
             }
 
+            // Cancel all jobs from non-existent accounts.
+            AccountAndUser[] allAccounts = AccountManagerService.getSingleton().getAllAccounts();
             List<SyncOperation> ops = getAllPendingSyncs();
             for (SyncOperation op: ops) {
-                if (!containsAccountAndUser(accounts, op.target.account, op.target.userId)) {
+                if (!containsAccountAndUser(allAccounts, op.target.account, op.target.userId)) {
                     getJobScheduler().cancel(op.jobId);
                 }
             }

services/core/java/com/android/server/content/SyncStorageEngine.java

@@ -826,6 +826,35 @@ public class SyncStorageEngine extends Handler {
         return true;
     }
 
+    /**
+     * STOPSHIP This is a temporary workaround and should be removed before shipping: b/28052438
+     */
+    void restorePeriodicSyncsIfNeededForUser(int userHandle, List<SyncOperation> periodicSyncs) {
+        if (mPeriodicSyncAddedListener == null) {
+            return;
+        }
+        synchronized (mAuthorities) {
+            for (int i = 0; i < mAuthorities.size(); i++) {
+                AuthorityInfo authority = mAuthorities.valueAt(i);
+                if (authority.target.userId == userHandle && authority.enabled) {
+                    boolean periodicSyncAlreadyExists = false;
+                    for (SyncOperation sync : periodicSyncs) {
+                        if (authority.target.matchesSpec(sync.target)) {
+                            periodicSyncAlreadyExists = true;
+                            break;
+                        }
+                    }
+                    // The periodic sync must have been lost due to previous bug.
+                    if (!periodicSyncAlreadyExists) {
+                        mPeriodicSyncAddedListener.onPeriodicSyncAdded(authority.target,
+                                new Bundle(), DEFAULT_POLL_FREQUENCY_SECONDS,
+                                calculateDefaultFlexTime(DEFAULT_POLL_FREQUENCY_SECONDS));
+                    }
+                }
+            }
+        }
+    }
+
     public void setMasterSyncAutomatically(boolean flag, int userId) {
         synchronized (mAuthorities) {
             Boolean auto = mMasterSyncAutomatically.get(userId);