Adding support for logging via swift-log

Package.swift

@@ -53,6 +53,10 @@ let package = Package(
       description: "Introduce SQLiteData conformances to the swift-tagged package."
     ),
     .trait(
+        name: "SQLiteDataSwiftLog",
+        description: "Use swift-log instead of OSLog for logging."
+     ),
+	.trait(
       name: "SQLiteDataTagged",
       description: "A deprecated alias for the 'Tagged' trait.",
       enabledTraits: ["Tagged"]
@@ -87,6 +91,7 @@ let package = Package(
       ]
     ),
     .package(url: "https://github.com/pointfreeco/swift-tagged", from: "0.10.0"),
+    .package(url: "https://github.com/apple/swift-log", from: "1.6.0")
   ],
   targets: [
     .target(
@@ -106,6 +111,11 @@ let package = Package(
           package: "swift-tagged",
           condition: .when(traits: ["Tagged"])
         ),
+        .product(
+            name: "Logging",
+            package: "swift-log",
+            condition: .when(traits: ["SQLiteDataSwiftLog"])
+        )
       ]
     ),
     .target(

Sources/SQLiteData/CloudKit/Internal/Logging.swift

@@ -1,10 +1,47 @@
-#if DEBUG && canImport(CloudKit)
+#if canImport(CloudKit)
+
+#if SQLiteDataSwiftLog
+  @_exported import struct Logging.Logger
+  import protocol Logging.LogHandler
+
+  @available(iOS 17, macOS 14, tvOS 17, watchOS 10, *)
+  extension SyncEngine {
+    public typealias Logger = Logging.Logger
+  }
+
+  @available(iOS 17, macOS 14, tvOS 17, watchOS 10, *)
+  extension SyncEngine.Logger {
+    public static var `default`: SyncEngine.Logger {
+      .init(label: "SQLiteData")
+    }
+    public static var disabled: SyncEngine.Logger {
+      .init(label: "SQLiteData") { _ in DisabledLogHandler() }
+    }
+  }
+#else
+  @_exported import struct os.Logger
+  @available(iOS 17, macOS 14, tvOS 17, watchOS 10, *)
+  extension SyncEngine {
+    public typealias Logger = os.Logger
+  }
+  @available(iOS 17, macOS 14, tvOS 17, watchOS 10, *)
+  extension SyncEngine.Logger {
+    public static var `default`: SyncEngine.Logger {
+      .init(subsystem: "SQLiteData", category: "CloudKit")
+    }
+    public static var disabled: SyncEngine.Logger {
+      .init(.disabled)
+    }
+  }
+#endif
+
+#if DEBUG
   import CloudKit
   import TabularData
   import os
 
   @available(iOS 17, macOS 14, tvOS 17, watchOS 10, *)
-  extension Logger {
+  extension SyncEngine.Logger {
     func log(_ event: SyncEngine.Event, syncEngine: any SyncEngineProtocol) {
       let prefix = "SQLiteData (\(syncEngine.database.databaseScope.label).db)"
       var actions: [String] = []
@@ -302,3 +339,25 @@
     }
   }
 #endif
+
+#if SQLiteDataSwiftLog
+  struct DisabledLogHandler: Logging.LogHandler {
+    var logLevel: Logging.Logger.Level = .info
+    var metadata: Logging.Logger.Metadata = [:]
+    subscript(metadataKey key: String) -> Logging.Logger.Metadata.Value? {
+      get { self.metadata[key] }
+      set { self.metadata[key] = newValue }
+    }
+    func log(
+      level: Logging.Logger.Level,
+      message: Logging.Logger.Message,
+      metadata: Logging.Logger.Metadata?,
+      source: String,
+      file: String,
+      function: String,
+      line: UInt
+    ) {}
+  }
+#endif
+
+#endif

Sources/SQLiteData/CloudKit/SyncEngine.swift

@@ -99,8 +99,7 @@
       defaultZone: CKRecordZone = CKRecordZone(zoneName: "co.pointfree.SQLiteData.defaultZone"),
       startImmediately: Bool? = nil,
       delegate: (any SyncEngineDelegate)? = nil,
-      logger: Logger = isTesting
-        ? Logger(.disabled) : Logger(subsystem: "SQLiteData", category: "CloudKit")
+      logger: Logger = isTesting ? Logger.disabled : Logger.default
     ) throws
     where
       repeat (each T1).PrimaryKey.QueryOutput: IdentifierStringConvertible,