RCOCOA-2273: Add support for Logger categories/ Improve current logger.

CHANGELOG.md

@@ -1,13 +1,19 @@
 x.y.z Release notes (yyyy-MM-dd)
 =============================================================
 ### Enhancements
-* None.
+* Added support for filtering logs by category. Users wil have more fine grained control over 
+  the log level for each category as well.
+  ```swift
+  Logger.setLogLevel(.info, category: Category.Storage.transactions)
+  ```
 
 ### Fixed
 * <How to hit and notice issue? what was the impact?> ([#????](https://github.com/realm/realm-swift/issues/????), since v?.?.?)
 * None.
 
-<!-- ### Breaking Changes - ONLY INCLUDE FOR NEW MAJOR version -->
+### Deprecations
+* `RLMLogger.level`/`Logger.level` has been deprecated in favor of using `RLMLogger.setLevel:forCategory:`/`Logger.setLevel(:category:)` and `RLMLogger.getLevelForCategory:`/`Logger.getLevel(for:)`.
+* It is not recommended to initialize a `RLMLogger/Logger` with a level anymore.
 
 ### Compatibility
 * Realm Studio: 15.0.0 or later.

Realm.xcodeproj/project.pbxproj

@@ -360,6 +360,7 @@
 		AC81360F287F21350029F15E /* AsymmetricObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = AC81360E287F21350029F15E /* AsymmetricObject.swift */; };
 		AC813612287F21700029F15E /* RLMAsymmetricObject.h in Headers */ = {isa = PBXBuildFile; fileRef = AC813610287F21700029F15E /* RLMAsymmetricObject.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		AC813613287F21700029F15E /* RLMAsymmetricObject.mm in Sources */ = {isa = PBXBuildFile; fileRef = AC813611287F21700029F15E /* RLMAsymmetricObject.mm */; };
+		AC848BEC2BFFA4AF0026A2A6 /* Logger.swift in Sources */ = {isa = PBXBuildFile; fileRef = AC848BEB2BFFA4AF0026A2A6 /* Logger.swift */; };
 		AC8846762686573B00DF4A65 /* SwiftUISyncTestHostApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = AC8846752686573B00DF4A65 /* SwiftUISyncTestHostApp.swift */; };
 		AC8846782686573B00DF4A65 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = AC8846772686573B00DF4A65 /* ContentView.swift */; };
 		AC8846B72687BC4100DF4A65 /* SwiftUIServerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = AC8846B62687BC4100DF4A65 /* SwiftUIServerTests.swift */; };
@@ -912,6 +913,7 @@
 		AC81360E287F21350029F15E /* AsymmetricObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AsymmetricObject.swift; sourceTree = "<group>"; };
 		AC813610287F21700029F15E /* RLMAsymmetricObject.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RLMAsymmetricObject.h; sourceTree = "<group>"; };
 		AC813611287F21700029F15E /* RLMAsymmetricObject.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = RLMAsymmetricObject.mm; sourceTree = "<group>"; };
+		AC848BEB2BFFA4AF0026A2A6 /* Logger.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Logger.swift; sourceTree = "<group>"; };
 		AC8846732686573B00DF4A65 /* SwiftUISyncTestHost.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = SwiftUISyncTestHost.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		AC8846752686573B00DF4A65 /* SwiftUISyncTestHostApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SwiftUISyncTestHostApp.swift; sourceTree = "<group>"; };
 		AC8846772686573B00DF4A65 /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
@@ -1362,6 +1364,7 @@
 				AC7825B82ACD90BE007ABA4B /* Geospatial.swift */,
 				5D1534B71CCFF545008976D7 /* LinkingObjects.swift */,
 				5D660FE41BE98D670021E04F /* List.swift */,
+				AC848BEB2BFFA4AF0026A2A6 /* Logger.swift */,
 				0C3BD4D225C1C5AB007CFDD3 /* Map.swift */,
 				5D660FE51BE98D670021E04F /* Migration.swift */,
 				CF76F80124816B3800890DD2 /* MongoClient.swift */,
@@ -2558,6 +2561,7 @@
 				3F857A482769291800F9B9B1 /* KeyPathStrings.swift in Sources */,
 				5D1534B81CCFF545008976D7 /* LinkingObjects.swift in Sources */,
 				5D660FF21BE98D670021E04F /* List.swift in Sources */,
+				AC848BEC2BFFA4AF0026A2A6 /* Logger.swift in Sources */,
 				0C3BD4D325C1C5AB007CFDD3 /* Map.swift in Sources */,
 				5D660FF31BE98D670021E04F /* Migration.swift in Sources */,
 				CF76F80224816B3800890DD2 /* MongoClient.swift in Sources */,

Realm/ObjectServerTests/RLMSyncTestCase.mm

@@ -613,7 +613,7 @@ - (RLMApp *)appWithId:(NSString *)appId {
     RLMApp *app = [RLMApp appWithConfiguration:config];
     RLMSyncManager *syncManager = app.syncManager;
     syncManager.userAgent = self.name;
-    RLMLogger.defaultLogger.level = RLMLogLevelWarn;
+    [RLMLogger setLevel:RLMLogLevelWarn forCategory:RLMLogCategorySync];
     return app;
 }
 

Realm/RLMLogger.h

@@ -48,33 +48,95 @@ typedef RLM_CLOSED_ENUM(NSUInteger, RLMLogLevel) {
     RLMLogLevelAll
 } NS_SWIFT_NAME(LogLevel);
 
+/**
+ An enum representing different categories of sync-related logging that can be configured.
+ Setting the log level for a parent category automatically sets the same level for all child categories.
+ Category hierarchy:
+```
+ Realm
+ ├─► Storage
+ │   ├─► Transaction
+ │   ├─► Query
+ │   ├─► Object
+ │   └─► Notification
+ ├─► Sync
+ │   ├─► Client
+ │   │   ├─► Session
+ │   │   ├─► Changeset
+ │   │   ├─► Network
+ │   │   └─► Reset
+ │   └─► Server
+ ├─► App
+ └─► Sdk
+```
+*/
+typedef NS_ENUM(NSUInteger, RLMLogCategory) {
+    ///  Top level log category for Realm, updating this category level would set all other subcategories too.
+    RLMLogCategoryRealm,
+    /// Log category for all sdk related logs.
+    RLMLogCategorySDK,
+    /// Log category for all app related logs.
+    RLMLogCategoryApp,
+    /// Log category for all database related logs.
+    RLMLogCategoryStorage,
+    /// Log category for all database transaction related logs.
+    RLMLogCategoryStorageTransaction,
+    /// Log category for all database queries related logs.
+    RLMLogCategoryStorageQuery,
+    /// Log category for all database object related logs.
+    RLMLogCategoryStorageObject,
+    /// Log category for all database notification related logs.
+    RLMLogCategoryStorageNotification,
+    /// Log category for all sync related logs.
+    RLMLogCategorySync,
+    /// Log category for all sync client related logs.
+    RLMLogCategorySyncClient,
+    /// Log category for all sync client session related logs.
+    RLMLogCategorySyncClientSession,
+    /// Log category for all sync client changeset related logs.
+    RLMLogCategorySyncClientChangeset,
+    /// Log category for all sync client network related logs.
+    RLMLogCategorySyncClientNetwork,
+    /// Log category for all sync client reset related logs.
+    RLMLogCategorySyncClientReset,
+    /// Log category for all sync server related logs.
+    RLMLogCategorySyncServer
+};
+
 /// A log callback function which can be set on RLMLogger.
 ///
 /// The log function may be called from multiple threads simultaneously, and is
 /// responsible for performing its own synchronization if any is required.
 RLM_SWIFT_SENDABLE // invoked on a background thread
 typedef void (^RLMLogFunction)(RLMLogLevel level, NSString *message);
 
+/// A log callback function which can be set on RLMLogger.
+///
+/// The log function may be called from multiple threads simultaneously, and is
+/// responsible for performing its own synchronization if any is required.
+RLM_SWIFT_SENDABLE // invoked on a background thread
+typedef void (^RLMLogCategoryFunction)(RLMLogLevel level, RLMLogCategory category, NSString *message) NS_REFINED_FOR_SWIFT;
 /**
- `RLMLogger` is used for creating your own custom logging logic.
+ Global logger class used by all Realm components.
 
  You can define your own logger creating an instance of `RLMLogger` and define the log function which will be
  invoked whenever there is a log message.
  Set this custom logger as you default logger using `setDefaultLogger`.
 
-     RLMLogger.defaultLogger = [[RLMLogger alloc] initWithLevel:RLMLogLevelDebug
-                                                logFunction:^(RLMLogLevel level, NSString * message) {
-         NSLog(@"Realm Log - %lu, %@", (unsigned long)level, message);
+     RLMLogger.defaultLogger = [[RLMLogger alloc] initWithLogFunction:^(RLMLogLevel level, NSString *category, NSString *message) {
+         NSLog(@"Realm Log - %lu, %@, %@", (unsigned long)level, category, message);
      }];
 
- @note By default default log threshold level is `RLMLogLevelInfo`, and logging strings are output to Apple System Logger.
+ @note The default log threshold level is `RLMLogLevelInfo` for the log category `RLMLogCategoryRealm`,
+       and logging strings are output to Apple System Logger.
 */
 @interface RLMLogger : NSObject
 
 /**
   Gets the logging threshold level used by the logger.
  */
-@property (nonatomic) RLMLogLevel level;
+@property (nonatomic) RLMLogLevel level
+__attribute__((deprecated("Use `setLevel(level:category)` or `setLevel:category` instead.")));
 
 /// :nodoc:
 - (instancetype)init NS_UNAVAILABLE;
@@ -84,16 +146,52 @@ typedef void (^RLMLogFunction)(RLMLogLevel level, NSString *message);
 
  @param level The log level to be set for the logger.
  @param logFunction The log function which will be invoked whenever there is a log message.
+
+ @note This will set the log level for the log category `RLMLogCategoryRealm`.
+*/
+- (instancetype)initWithLevel:(RLMLogLevel)level logFunction:(RLMLogFunction)logFunction
+__attribute__((deprecated("Use `initWithLogFunction:` instead.")));
+
+/**
+ Creates a logger with a callback, which will be invoked whenever there is a log message.
+
+ @param logFunction The log function which will be invoked whenever there is a log message.
 */
-- (instancetype)initWithLevel:(RLMLogLevel)level logFunction:(RLMLogFunction)logFunction;
+- (instancetype)initWithLogFunction:(RLMLogCategoryFunction)logFunction;
 
 #pragma mark RLMLogger Default Logger API
 
 /**
- The current default logger. When setting a logger as default, this logger will be used whenever information must be logged.
+ The current default logger. When setting a logger as default, this logger will replace the current default logger and will
+ be used whenever information must be logged.
  */
 @property (class) RLMLogger *defaultLogger NS_SWIFT_NAME(shared);
 
+/**
+ Log a message to the supplied level.
+
+ @param logLevel The log level for the message.
+ @param category The log category for the message.
+ @param message The message to log.
+ */
+- (void)logWithLevel:(RLMLogLevel)logLevel category:(RLMLogCategory)category message:(NSString *)message;
+
+/**
+ Sets the gobal log level for a given category.
+
+ @param level The log level to be set for the logger.
+ @param category The log function which will be invoked whenever there is a log message.
+*/
++ (void)setLevel:(RLMLogLevel)level forCategory:(RLMLogCategory)category NS_REFINED_FOR_SWIFT;
+
+/**
+ Gets the global log level for the specified category.
+
+ @param category The log category which we need the level.
+ @returns The log level for the specified category
+*/
++ (RLMLogLevel)levelForCategory:(RLMLogCategory)category NS_REFINED_FOR_SWIFT;
+
 @end
 
 RLM_HEADER_AUDIT_END(nullability)