Switch to gRPC client in Swift app

Apple/Configuration/Constants/Constants.swift

@@ -0,0 +1,38 @@
+@_implementationOnly import CConstants
+import OSLog
+
+public enum Constants {
+    enum Error: Swift.Error {
+        case invalidAppGroupIdentifier
+    }
+
+    public static let bundleIdentifier = AppBundleIdentifier
+    public static let appGroupIdentifier = AppGroupIdentifier
+    public static let networkExtensionBundleIdentifier = NetworkExtensionBundleIdentifier
+
+    public static var socketURL: URL {
+        get throws {
+            try groupContainerURL.appending(component: "burrow.sock", directoryHint: .notDirectory)
+        }
+    }
+    public static var databaseURL: URL {
+        get throws {
+            try groupContainerURL.appending(component: "burrow.db", directoryHint: .notDirectory)
+        }
+    }
+
+    private static var groupContainerURL: URL {
+        get throws { try _groupContainerURL.get() }
+    }
+    private static let _groupContainerURL: Result<URL, Error> = {
+        switch FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroupIdentifier) {
+        case .some(let url): .success(url)
+        case .none: .failure(.invalidAppGroupIdentifier)
+        }
+    }()
+}
+
+extension Logger {
+    @_dynamicReplacement(for: subsystem)
+    public static var subsystem: String { Constants.bundleIdentifier }
+}