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RESTClient.swift
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RESTClient.swift
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//
// RESTClient.swift
// CombineTest
//
// Created by Gualtiero Frigerio on 27/06/2019.
// Copyright © 2019 Gualtiero Frigerio. All rights reserved.
//
import Combine
import Foundation
enum RESTClientError : Error {
case error(String)
}
/// Simple REST client using combine to return a Future
class RESTClient {
class func getData(atURL url:URL) -> Future<Data, RESTClientError> {
let session = URLSession.shared
return Future { promise in
let task = session.dataTask(with: url) { data, response, error in
if let err = error {
promise(.failure(RESTClientError.error(err.localizedDescription)))
}
else {
if let data = data {
promise(.success(data))
}
else {
let unknownError = RESTClientError.error("Unknown error")
promise(.failure(unknownError))
}
}
}
task.resume()
}
}
@available (iOS 15.0, *)
class func getData(atURL url: URL) async -> Data? {
let request = URLRequest(url: url)
guard let data = try? await URLSession.shared.data(for: request,
delegate: nil) else {
return nil
}
return data.0
}
// just a couple of example of using AsyncSequence with for loop and iterator
@available (iOS 15.0, *)
class func getDataIterator(atURL url: URL) async -> Data? {
let request = URLRequest(url: url)
var data: Data? = nil
do {
let (bytes, _) = try await URLSession.shared.bytes(for: request, delegate: nil)
data = Data()
var iterator = bytes.makeAsyncIterator()
while let nextByte = try await iterator.next() {
data?.append(nextByte)
}
}
catch (let error) {
print("error while getting data \(error.localizedDescription)")
}
return data
}
@available (iOS 15.0, *)
class func getDataStream(atURL url: URL) async -> Data? {
let request = URLRequest(url: url)
var data: Data? = nil
do {
let (bytes, _) = try await URLSession.shared.bytes(for: request, delegate: nil)
data = Data()
for try await b in bytes {
data?.append(b)
}
}
catch (let error) {
print("error while getting data \(error.localizedDescription)")
}
return data
}
class func getDataCompletion(atURL url: URL,
completion: @escaping ((Data?) -> ())) {
let task = URLSession.shared.dataTask(with: url) { data, response, error in
completion(data)
}
task.resume()
}
}