feat: fix Sendable warnings across the codebase (#46)

Author: zamderax

Sources/Casbin/APi/InternalApi.swift

@@ -74,7 +74,7 @@ extension CoreApi {
     }
 
 
-    private func afterOperatePolicy<T>(sec:String,oped:Bool,d:EventData,t:T) -> EventLoopFuture<T> {
+    private func afterOperatePolicy<T: Sendable>(sec:String,oped:Bool,d:EventData,t:T) -> EventLoopFuture<T> {
         if oped {
             emit(e: Event.PolicyChange, d: d)
             emit(e: Event.ClearCache, d: EventData.ClearCache)
@@ -88,4 +88,3 @@ extension CoreApi {
         return eventLoopGroup.next().makeSucceededFuture(t)
     }
 }
-

Sources/Casbin/Adapter/FileAdapter.swift

@@ -77,12 +77,18 @@ public final class FileAdapter {
 
 extension FileAdapter: Adapter {
     public func loadPolicy(m: Model) -> EventLoopFuture<Void> {
-        loadPolicyFile(m: m, handler:Util.loadPolicyLine(line:m:))
+        // Wrap the handler in an explicit @Sendable closure to avoid warnings
+        // about converting a non-sendable function to a @Sendable type.
+        loadPolicyFile(m: m, handler: { (line: String, model: Model) in
+            Util.loadPolicyLine(line: line, m: model)
+        })
     }
 
     public func loadFilteredPolicy(m: Model, f: Filter) -> EventLoopFuture<Void> {
-        loadFilteredPolicyFile(m: m, filter: f, handler: Util.loadFilteredPolicyLine).map {
-            self.isFiltered = $0
+        loadFilteredPolicyFile(m: m, filter: f, handler: { (line: String, model: Model, filter: Filter) in
+            Util.loadFilteredPolicyLine(line: line, m: model, f: filter)
+        }).map { isFiltered in
+            self.isFiltered = isFiltered
         }
     }
 

Sources/Casbin/Config.swift

@@ -14,7 +14,7 @@
 
 import NIO
 
-public struct Config {
+public struct Config: Sendable {
     var data: [String:[String:String]] = [:]
     static let DEFAULT_SECTION = "default"
     static let DEFAULT_COMMENT:Character = "#"