Fix temporary disconnect when app goes inactive (#13564)

Author: paulb777

FirebaseDatabase/CHANGELOG.md

@@ -1,3 +1,7 @@
+# Unreleased
+- [fixed] Fix temporary disconnects when the app goes inactive. The issue was
+  introduced in 10.27.0. (#13529)
+
 # 11.0.0
 - [removed] **Breaking change**: The deprecated `FirebaseDatabaseSwift`
   module has been removed. See

FirebaseDatabase/Sources/Core/FPersistentConnection.m

@@ -34,11 +34,9 @@
 #import "FirebaseDatabase/Sources/Utilities/FUtilities.h"
 #import "FirebaseDatabase/Sources/Utilities/Tuples/FTupleCallbackStatus.h"
 #import "FirebaseDatabase/Sources/Utilities/Tuples/FTupleOnDisconnect.h"
-#if TARGET_OS_WATCH
-#import <WatchKit/WatchKit.h>
-#else
+#if !TARGET_OS_WATCH
 #import <SystemConfiguration/SystemConfiguration.h>
-#endif // TARGET_OS_WATCH
+#endif // !TARGET_OS_WATCH
 #import <dlfcn.h>
 #import <netinet/in.h>
 
@@ -168,7 +166,6 @@ - (id)initWithRepoInfo:(FRepoInfo *)repoInfo
                         retryExponent:kPersistentConnReconnectMultiplier
                          jitterFactor:0.7];
 
-        [self setupNotifications];
         // Make sure we don't actually connect until open is called
         [self interruptForReason:kFInterruptReasonWaitingForOpen];
     }
@@ -553,29 +550,6 @@ - (void)openNetworkConnectionWithContext:
     [self.realtime open];
 }
 
-- (void)enteringForeground {
-    dispatch_async(self.dispatchQueue, ^{
-      // Reset reconnect delay
-      [self.retryHelper signalSuccess];
-      if (self->connectionState == ConnectionStateDisconnected) {
-          [self tryScheduleReconnect];
-      }
-    });
-}
-
-- (void)setupNotifications {
-#if TARGET_OS_WATCH
-    __weak FPersistentConnection *weakSelf = self;
-    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
-    [center addObserverForName:WKApplicationWillEnterForegroundNotification
-                        object:nil
-                         queue:nil
-                    usingBlock:^(NSNotification *_Nonnull note) {
-                      [weakSelf enteringForeground];
-                    }];
-#endif // TARGET_OS_WATCH
-}
-
 - (void)sendAuthAndRestoreStateAfterComplete:(BOOL)restoreStateAfterComplete {
     NSAssert([self connected], @"Must be connected to send auth");
     NSAssert(self.authToken != nil,

FirebaseDatabase/Sources/Realtime/FWebSocketConnection.m

@@ -110,27 +110,6 @@ - (instancetype)initWith:(FRepoInfo *)repoInfo
             NSURLSessionWebSocketTask *task =
                 [session webSocketTaskWithRequest:req];
             self.webSocketTask = task;
-
-#if TARGET_OS_IOS || TARGET_OS_TV || TARGET_OS_VISION || TARGET_OS_MACCATALYST
-            NSString *resignName = UIApplicationWillResignActiveNotification;
-#elif TARGET_OS_OSX
-            NSString *resignName = NSApplicationWillResignActiveNotification;
-#elif TARGET_OS_WATCH
-            NSString *resignName = WKApplicationWillResignActiveNotification;
-#elif
-#error("missing platform")
-#endif
-            [[NSNotificationCenter defaultCenter]
-                addObserverForName:resignName
-                            object:nil
-                             queue:opQueue
-                        usingBlock:^(NSNotification *_Nonnull note) {
-                          FFLog(@"I-RDB083015",
-                                @"Received notification that application "
-                                @"will resign, "
-                                @"closing web socket.");
-                          [self onClosed];
-                        }];
         }
     }
     return self;