watchOS support for RTDB (#7656)

* Initial attempt for watchOS Database support

* watchOS Package manifest changes for SwiftPM testing.

* Fix iOS compilation

* Further iOS changes

* Further watchOS changes

* Reverted !WATCHOS && 0 change, fixed SharedTestUtils

* Proper logging, using positive if statements

* Properly handle lifecycle changes on watchOS sockets.

Also only log errors if we haven't closed things intentionally.

* Cleanup:

- Removal from outdated sample
- Fixed podspec
- Fixed Swift Package

* Actually restore SwiftPM XCScheme

* Restore ExtensionDelegate.swift

* Revert all changes to ExtensionDelegate.swift

* Cleanup from code review.

* Style

* Added CHANGELOG entry.

* Review comments.

* Style.sh

* Remove unnecessary wrappers for SwiftPM

* Review feedback

* Formatting

Author: ryanwilson

FirebaseDatabase.podspec

@@ -16,9 +16,16 @@ Simplify your iOS development, grow your user base, and monetize more effectivel
     :tag => 'CocoaPods-' + s.version.to_s
   }
   s.social_media_url = 'https://twitter.com/Firebase'
-  s.ios.deployment_target = '10.0'
-  s.osx.deployment_target = '10.12'
-  s.tvos.deployment_target = '10.0'
+
+  ios_deployment_target = '10.0'
+  osx_deployment_target = '10.12'
+  tvos_deployment_target = '10.0'
+  watchos_deployment_target = '7.0'
+
+  s.ios.deployment_target = ios_deployment_target
+  s.osx.deployment_target = osx_deployment_target
+  s.tvos.deployment_target = tvos_deployment_target
+  s.watchos.deployment_target = watchos_deployment_target
 
   s.cocoapods_version = '>= 1.4.0'
   s.prefix_header_file = false
@@ -33,7 +40,10 @@ Simplify your iOS development, grow your user base, and monetize more effectivel
   ]
   s.public_header_files = base_dir + 'Public/FirebaseDatabase/*.h'
   s.libraries = ['c++', 'icucore']
-  s.frameworks = 'CFNetwork', 'Security', 'SystemConfiguration'
+  s.ios.frameworks = 'CFNetwork', 'Security', 'SystemConfiguration'
+  s.tvos.frameworks = 'CFNetwork', 'Security', 'SystemConfiguration'
+  s.macos.frameworks = 'CFNetwork', 'Security', 'SystemConfiguration'
+  s.watchos.frameworks = 'CFNetwork', 'Security', 'WatchKit'
   s.dependency 'leveldb-library', '~> 1.22'
   s.dependency 'FirebaseCore', '~> 7.0'
   s.pod_target_xcconfig = {
@@ -42,6 +52,7 @@ Simplify your iOS development, grow your user base, and monetize more effectivel
   }
 
   s.test_spec 'unit' do |unit_tests|
+    unit_tests.platforms = {:ios => ios_deployment_target, :osx => osx_deployment_target, :tvos => tvos_deployment_target}
     unit_tests.scheme = { :code_coverage => true }
     unit_tests.source_files = [
       'FirebaseDatabase/Tests/Unit/*.[mh]',
@@ -57,6 +68,7 @@ Simplify your iOS development, grow your user base, and monetize more effectivel
   end
 
   s.test_spec 'integration' do |int_tests|
+    int_tests.platforms = {:ios => ios_deployment_target, :osx => osx_deployment_target, :tvos => tvos_deployment_target}
     int_tests.scheme = { :code_coverage => true }
     int_tests.source_files = [
       'FirebaseDatabase/Tests/Integration/*.[mh]',

FirebaseDatabase/CHANGELOG.md

@@ -1,3 +1,6 @@
+# Unreleased
+- [added] Added community support for watchOS. (#4556)
+
 # v7.7.0
 - [fixed] Fix variable length array diagnostics warning (#7460).
 # v7.5.1

FirebaseDatabase/Sources/Core/FPersistentConnection.m

@@ -34,7 +34,11 @@
 #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
 #import <SystemConfiguration/SystemConfiguration.h>
+#endif // TARGET_OS_WATCH
 #import <dlfcn.h>
 #import <netinet/in.h>
 
@@ -90,7 +94,9 @@ @interface FPersistentConnection () {
     NSTimeInterval reconnectDelay;
     NSTimeInterval lastConnectionAttemptTime;
     NSTimeInterval lastConnectionEstablishedTime;
+#if !TARGET_OS_WATCH
     SCNetworkReachabilityRef reachability;
+#endif // !TARGET_OS_WATCH
 }
 
 - (int)getNextRequestNumber;
@@ -174,11 +180,13 @@ - (id)initWithRepoInfo:(FRepoInfo *)repoInfo
 }
 
 - (void)dealloc {
+#if !TARGET_OS_WATCH
     if (reachability) {
         // Unschedule the notifications
         SCNetworkReachabilitySetDispatchQueue(reachability, NULL);
         CFRelease(reachability);
     }
+#endif // !TARGET_OS_WATCH
 }
 
 #pragma mark -
@@ -537,6 +545,7 @@ - (void)openNetworkConnectionWithToken:(NSString *)token {
     [self.realtime open];
 }
 
+#if !TARGET_OS_WATCH
 static void reachabilityCallback(SCNetworkReachabilityRef ref,
                                  SCNetworkReachabilityFlags flags, void *info) {
     if (flags & kSCNetworkReachabilityFlagsReachable) {
@@ -552,6 +561,7 @@ static void reachabilityCallback(SCNetworkReachabilityRef ref,
         FFLog(@"I-RDB034015", @"Network is not reachable");
     }
 }
+#endif // !TARGET_OS_WATCH
 
 - (void)enteringForeground {
     dispatch_async(self.dispatchQueue, ^{
@@ -564,7 +574,18 @@ - (void)enteringForeground {
 }
 
 - (void)setupNotifications {
-
+#if TARGET_OS_WATCH
+    if (@available(watchOS 7.0, *)) {
+        __weak FPersistentConnection *weakSelf = self;
+        NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
+        [center addObserverForName:WKApplicationWillEnterForegroundNotification
+                            object:nil
+                             queue:nil
+                        usingBlock:^(NSNotification *_Nonnull note) {
+                          [weakSelf enteringForeground];
+                        }];
+    }
+#else
     NSString *const *foregroundConstant = (NSString *const *)dlsym(
         RTLD_DEFAULT, "UIApplicationWillEnterForegroundNotification");
     if (foregroundConstant) {
@@ -592,6 +613,7 @@ - (void)setupNotifications {
         CFRelease(reachability);
         reachability = NULL;
     }
+#endif // !TARGET_OS_WATCH
 }
 
 - (void)sendAuthAndRestoreStateAfterComplete:(BOOL)restoreStateAfterComplete {
@@ -1234,6 +1256,10 @@ - (void)sendConnectStats {
     if (self.config.persistenceEnabled) {
         stats[@"persistence.osx.enabled"] = @1;
     }
+#elif TARGET_OS_WATCH
+    if (self.config.persistenceEnabled) {
+        stats[@"persistence.watchos.enabled"] = @1;
+    }
 #endif
     NSString *sdkVersion =
         [[FIRDatabase sdkVersion] stringByReplacingOccurrencesOfString:@"."

FirebaseDatabase/Sources/Persistence/FLevelDBStorageEngine.m

@@ -267,11 +267,16 @@ - (void)close {
 }
 
 + (NSString *)firebaseDir {
-#if TARGET_OS_IOS || TARGET_OS_TV
+#if TARGET_OS_IOS || TARGET_OS_WATCH
     NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(
         NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *documentsDir = [dirPaths objectAtIndex:0];
     return [documentsDir stringByAppendingPathComponent:@"firebase"];
+#elif TARGET_OS_TV
+    NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(
+        NSCachesDirectory, NSUserDomainMask, YES);
+    NSString *cachesDir = [dirPaths objectAtIndex:0];
+    return [cachesDir stringByAppendingPathComponent:@"firebase"];
 #elif TARGET_OS_OSX
     return [NSHomeDirectory() stringByAppendingPathComponent:@".firebase"];
 #endif

FirebaseDatabase/Sources/Realtime/FWebSocketConnection.h

@@ -15,12 +15,18 @@
  */
 
 #import "FirebaseDatabase/Sources/Utilities/FUtilities.h"
+#if !TARGET_OS_WATCH
 #import "FirebaseDatabase/Sources/third_party/SocketRocket/FSRWebSocket.h"
+#endif // !TARGET_OS_WATCH
 #import <Foundation/Foundation.h>
 
 @protocol FWebSocketDelegate;
 
+#if !TARGET_OS_WATCH
 @interface FWebSocketConnection : NSObject <FSRWebSocketDelegate>
+#else
+@interface FWebSocketConnection : NSObject <NSURLSessionWebSocketDelegate>
+#endif // else !TARGET_OS_WATCH
 
 @property(nonatomic, weak) id<FWebSocketDelegate> delegate;
 
@@ -34,13 +40,19 @@
 - (void)start;
 - (void)send:(NSDictionary *)dictionary;
 
+// Ignore FSRWebSocketDelegate calls on watchOS.
+#if !TARGET_OS_WATCH
 - (void)webSocket:(FSRWebSocket *)webSocket didReceiveMessage:(id)message;
-- (void)webSocketDidOpen:(FSRWebSocket *)webSocket;
+
+// Exclude the `webSocket` argument since it isn't used in this codebase and it
+// allows for better code sharing with watchOS.
+- (void)webSocketDidOpen;
 - (void)webSocket:(FSRWebSocket *)webSocket didFailWithError:(NSError *)error;
 - (void)webSocket:(FSRWebSocket *)webSocket
     didCloseWithCode:(NSInteger)code
               reason:(NSString *)reason
             wasClean:(BOOL)wasClean;
+#endif // !TARGET_OS_WATCH
 
 @end