Simplified process startup on macOS and Linux

Apple/NetworkExtension/Client.swift

@@ -0,0 +1,60 @@
+import BurrowShared
+import Foundation
+import Network
+
+final class Client {
+    let connection: NWConnection
+
+    private let logger: Logger = Logger.logger(for: Client.self)
+    private var generator = SystemRandomNumberGenerator()
+
+    convenience init() throws {
+        self.init(url: try Constants.socketURL)
+    }
+
+    init(url: URL) {
+        let endpoint: NWEndpoint
+        if url.isFileURL {
+            endpoint = .unix(path: url.path(percentEncoded: false))
+        } else {
+            endpoint = .url(url)
+        }
+
+        let parameters = NWParameters.tcp
+        parameters.defaultProtocolStack
+            .applicationProtocols
+            .insert(NWProtocolFramer.Options(definition: NewlineProtocolFramer.definition), at: 0)
+        connection = NWConnection(to: endpoint, using: parameters)
+        connection.start(queue: .global())
+    }
+
+    func request<U: Decodable>(_ request: any Request, type: U.Type = U.self) async throws -> U {
+        do {
+            var copy = request
+            copy.id = generator.next(upperBound: UInt.max)
+            let content = try JSONEncoder().encode(copy)
+            logger.debug("> \(String(decoding: content, as: UTF8.self))")
+
+            try await self.connection.send(content: content)
+            let (response, _, _) = try await connection.receiveMessage()
+
+            logger.debug("< \(String(decoding: response, as: UTF8.self))")
+            return try JSONDecoder().decode(U.self, from: response)
+        } catch {
+            logger.error("\(error, privacy: .public)")
+            throw error
+        }
+    }
+
+    deinit {
+        connection.cancel()
+    }
+}
+
+extension Constants {
+    static var socketURL: URL {
+        get throws {
+            try groupContainerURL.appending(component: "burrow.sock", directoryHint: .notDirectory)
+        }
+    }
+}