Network Layer v2.0

NetworkLayer_v2.swift

import Foundation
import Alamofire
import SwiftyJSON

protocol NetworkRequest {
  associatedtype ResponseType
  
  var endpoint: String { get }
  func jsonResponseHandler<ResponseType: JSONDecodable>(data: NSData) -> ResponseType?
  
  var baseUrl: String { get }
  var method: Alamofire.HTTPMethod { get }
  var encoding: Alamofire.ParameterEncoding { get }
  var parameters: [String : AnyObject]? { get }
  var headers: [String : String] { get }
}

extension NetworkRequest {

  var baseUrl: String { return "https://xxxx//api/v1" }
  var url: String { return baseURL+endpoint }
  var method: Alamofire.HTTPMethod { return .get }
  var encoding: Alamofire.ParameterEncoding { return JSONEncoding.default }
  var parameters: [String : AnyObject]? { return nil }
  var headers: [String : String] { return  ["Content-Type": "application/json","Accept": "application/json"] }
}

extension NetworkRequest {
  
  func jsonResponseHandler<ResponseType: JSONDecodable>(data: NSData) -> ResponseType? {
    let json = JSON(data: data as Data)
    return ResponseType(json: json)
  }
}

protocol NetworkLayerProcotol {
  static func makeRequest<NetworkRequestGenericType: NetworkRequest>(networkRequest: NetworkRequestGenericType, completionHandler: @escaping (NSData?,Error?) -> Void)
}

struct NetworkLayer:NetworkLayerProcotol {

  static func makeRequest<NetworkRequestGenericType: NetworkRequest> (networkRequest: NetworkRequestGenericType,completionHandler:@escaping (NSData?,Error?)  -> Void) where NetworkRequestGenericType : NetworkRequest {
    
    Alamofire.request(
      networkRequest.url,
      method: networkRequest.method,
      parameters: networkRequest.parameters,
      encoding: networkRequest.encoding,
      headers: networkRequest.headers
      ).responseJSON { (response) -> Void in
        
        debugPrint(response)
        
        switch response.result {
        case Result.success:
          print("[API success]:\(String(describing: response.request?.url?.absoluteString))")
          
          if let data = response.data {
            completionHandler( data as NSData,nil)
          }
          
          break
        case Result.failure(let encodingError):          
          print("[API error]:\(encodingError)")
          if let resCode = response.response?.statusCode {
            print(resCode)
          }
          break
          
        completionHandler(nil,response.error!)
      }
    }
  }
}

protocol JSONDecodable {
  init?(json: JSON)
}