Alamofire generalize request - ios

Question

I am using Almofire for all my requests and works fine. I need to know how to generalize all requests to handle all errors at one place.
func updateSettingValue(group : String , value: String , callback: #escaping (SettingsResponseModel) -> Void, errorCallback: #escaping (Error) ->Void)
{
let url = BASE_URL_PROD + API_SETTINGS
let settingsParams : Parameters = ["Setting" : group , "Tag" : value]
Alamofire.request(url, method: .put, parameters: settingsParams, headers: getHeader()).responseObject {
(response: DataResponse< SettingsResponseModel>) in
switch response.result {
case .success:
print("response \(response)")
DispatchQueue.main.async {
callback(response.result.value!)
}
break
case .failure(let error):
print(error)
errorCallback(error)
}
}
}
func releaseKeys(mKey: String ,callback: #escaping (ReleaseKeyModel) -> Void
, errorCallback: #escaping (Error) -> Void){
let url = BASE_URL_PROD + API_RELEASE_KEY
let params: Parameters = ["mKey" : mKey]
Alamofire.request(url, method: .delete, parameters: params, encoding: URLEncoding.default, headers: getHeader()).responseObject{
(response : DataResponse< ReleaseKeyModel >) in
print("releaseKey: \(response) ")
switch response.result {
case .success:
DispatchQueue.main.async {
callback(response.result.value!)
}
break
case .failure(let error):
print(error)
errorCallback(error)
}
}
}
How can I generalize this to take parameters for Mapping Model class in DataResponse so that I don't have to handle success and failure case individually for all methods.

Answer 1

You can divide the work with the server into 2 classes:
1) class RestClient
import Foundation
typealias responseBlock = (_ swiftObj: Any?, _ error: Error?) -> Void
class RestClient: NSObject {
static let shared = RestClient()
private var http = HttpService()
func updateSettingValue(group: String, value: String, resp: #escaping responseBlock) {
let url = BASE_URL_PROD + API_SETTINGS
let params = ["Setting": group, "Tag": value]
http.reque(url, method: .put, parameters: params, headers: getHeader(), resp: { (value, error) in
if let err = error {
return resp(nil, err)
}
guard let data = value else {
return resp(nil, error)
}
//your method for parse data
self.parseData(respData: data,
modelCls: SettingsResponseModel.self,
response: resp)
})
}
func releaseKeys(mKey: String, resp: #escaping responseBlock) {
let url = BASE_URL_PROD + API_RELEASE_KEY
let params = ["mKey": mKey]
http.reque(url, method: .delete, parameters: params, encoding: URLEncoding.default, headers: getHeader(), resp: { (value, error) in
if let err = error {
return resp(nil, err)
}
guard let data = value else {
return resp(nil, error)
}
//your method for parse data
self.parseData(respData: data,
modelCls: ReleaseKeyModel.self,
response: resp)
})
}
}
2) class HttpService
class HttpService {
func reque(_ url: URLConvertible,
method: HTTPMethod = .get,
parameters: Parameters? = nil,
encoding: ParameterEncoding = URLEncoding.default,
headers: HTTPHeaders? = nil,
queue: QueueQos = .defaultQos,
resp: #escaping responseBlock) {
Alamofire.request(url,
method: method,
parameters: parameters,
encoding: encoding,
headers: headers
).responseObject (queue: queue) { (response) in
switch response.result {
case .success:
if let jsonResp = response.result.value {
//You can also check out some error messages at this place.
resp(jsonResp, nil)
}
case .failure(let error):
resp(nil, error)
}
}
}
}

Answer 2

Try this, using generics
func releaseKeys<T: Codable>(parameters params: [String: Any], callback: #escaping (T) -> Void
, errorCallback: #escaping (Error) -> Void){
Alamofire.request(url, method: .delete, parameters: params, encoding: URLEncoding.default, headers: getHeader()).responseObject{
(response : DataResponse< T >) in
print("releaseKey: \(response) ")
switch response.result {
case .success:
DispatchQueue.main.async {
callback(response.result.value!)
}
break
case .failure(let error):
print(error)
errorCallback(error)
}
}
}