Networking LayerProtocols for CallBack type

NetworkingLayerProtocolsForCallBackType.swift

// An AssociatedType Protocol: Request type to be implemented by Concrete Requests
protocol Request {
    associatedtype Response: Decodable // 1. A Response Type constrained to be decodable
    associatedtype ResponseParser: ResponseParserType where ResponseParser.Response == Response // 2 Response parser contrained to be confirming to ResponseParserType
    // 3 Basic properties required by a request
    var baseUrl: String { get } 
    var path: String { get }
    var method: String { get }
    
    var header: [String: String]? { get }
    var parser: ResponseParser? { get } // 3
    var errorParser: ErrorParserType? { get } // 4 Error Parsing type confirming to ErrorParserType
    
    func parameter() -> [String: Any]?
}

// Convert the Request type to URLRequests
protocol RequestConvertable: Request {
    func asURLRequest() throws -> URLRequest
}
// A generic type protocol that defines the abstraction for Parser. 
protocol ResponseParserType {
    associatedtype Response
    func parse(data: Data) throws -> Response?
}

public typealias JSONDictionary = [String : Any]

// A protocol defining the abstraction for Error parser.
protocol ErrorParserType {
    func parse(data: JSONDictionary) -> Error?
}


protocol RequestExecutor {
    func executeRequest<R: RequestConvertable>(_ request: R, completion: @escaping (Result<R.Response, Error>) -> Void)
}