Add try-catch

submodules/MtProtoKit/PublicHeaders/MtProtoKit/MTContext.h

@@ -56,6 +56,8 @@
 
 + (MTQueue * _Nonnull)contextQueue;
 
++ (void)performWithObjCTry:(dispatch_block_t _Nonnull)block;
+
 - (instancetype _Nonnull)initWithSerialization:(id<MTSerialization> _Nonnull)serialization encryptionProvider:(id<EncryptionProvider> _Nonnull)encryptionProvider apiEnvironment:(MTApiEnvironment * _Nonnull)apiEnvironment isTestingEnvironment:(bool)isTestingEnvironment useTempAuthKeys:(bool)useTempAuthKeys;
 
 - (void)performBatchUpdates:(void (^ _Nonnull)())block;

submodules/MtProtoKit/Sources/MTContext.m

@@ -283,6 +283,13 @@ static int32_t fixedTimeDifferenceValue = 0;
     return queue;
 }
 
++ (void)performWithObjCTry:(dispatch_block_t _Nonnull)block {
+    @try {
+        block();
+    } @finally {
+    }
+}
+
 - (void)cleanup
 {
     NSDictionary *datacenterAuthActions = _datacenterAuthActions;

submodules/TelegramCore/Sources/Network/Network.swift

@@ -1093,13 +1093,25 @@ class Keychain: NSObject, MTKeychain {
     }
     
     func setObject(_ object: Any!, forKey aKey: String!, group: String!) {
-        let data = NSKeyedArchiver.archivedData(withRootObject: object)
-        self.set(group + ":" + aKey, data)
+        guard let object = object else {
+            return
+        }
+        MTContext.perform(objCTry: {
+            let data = NSKeyedArchiver.archivedData(withRootObject: object)
+            self.set(group + ":" + aKey, data)
+        })
     }
     
     func object(forKey aKey: String!, group: String!) -> Any! {
+        guard let aKey = aKey, let group = group else {
+            return nil
+        }
         if let data = self.get(group + ":" + aKey) {
-            return NSKeyedUnarchiver.unarchiveObject(with: data as Data)
+            var result: Any?
+            MTContext.perform(objCTry: {
+                result = NSKeyedUnarchiver.unarchiveObject(with: data as Data)
+            })
+            return result
         }
         return nil
     }