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import Foundation
import Result
public class API {
public class var defaultURLSession: NSURLSession {
return internalDefaultURLSession
}
private static let internalDefaultURLSession = NSURLSession(
configuration: NSURLSessionConfiguration.defaultSessionConfiguration(),
delegate: URLSessionDelegate(),
delegateQueue: nil
)
// send request and build response object
public class func sendRequest<T: Request>(request: T, URLSession: NSURLSession = defaultURLSession, handler: (Result<T.Response, APIError>) -> Void = {r in}) -> NSURLSessionDataTask? {
var dataTask: NSURLSessionDataTask?
switch request.createTaskInURLSession(URLSession) {
case .Failure(let error):
handler(.Failure(error))
case .Success(let task):
dataTask = task
task.request = Box(request)
task.completionHandler = { data, URLResponse, connectionError in
let sessionResult: Result<(NSData, NSURLResponse?), APIError>
if let error = connectionError {
sessionResult = .Failure(.ConnectionError(error))
} else {
sessionResult = .Success((data, URLResponse))
}
let result: Result<T.Response, APIError> = sessionResult.flatMap { data, URLResponse in
request.parseData(data, URLResponse: URLResponse)
}
dispatch_async(dispatch_get_main_queue()) {
handler(result)
}
}
task.resume()
}
return dataTask
}
public class func cancelRequest<T: Request>(requestType: T.Type, passingTest test: T -> Bool = { r in true }) {
cancelRequest(requestType, URLSession: defaultURLSession, passingTest: test)
}
public class func cancelRequest<T: Request>(requestType: T.Type, URLSession: NSURLSession, passingTest test: T -> Bool = { r in true }) {
URLSession.getTasksWithCompletionHandler { dataTasks, uploadTasks, downloadTasks in
let allTasks = dataTasks as [NSURLSessionTask]
+ uploadTasks as [NSURLSessionTask]
+ downloadTasks as [NSURLSessionTask]
allTasks.filter { task in
var request: T?
switch task {
case let x as NSURLSessionDataTask:
request = x.request?.value as? T
case let x as NSURLSessionDownloadTask:
request = x.request?.value as? T
default:
break
}
if let request = request {
return test(request)
} else {
return false
}
}.forEach { $0.cancel() }
}
}
}
// MARK: - default implementation of URLSessionDelegate
public class URLSessionDelegate: NSObject, NSURLSessionDelegate, NSURLSessionDataDelegate {
// MARK: NSURLSessionTaskDelegate
public func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError connectionError: NSError?) {
if let dataTask = task as? NSURLSessionDataTask {
dataTask.completionHandler?(dataTask.responseBuffer, dataTask.response, connectionError)
}
}
// MARK: NSURLSessionDataDelegate
public func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {
dataTask.responseBuffer.appendData(data)
}
public func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didBecomeDownloadTask downloadTask: NSURLSessionDownloadTask) {
downloadTask.request = dataTask.request
}
}
// Box<T> is still necessary internally to store struct into associated object
private final class Box<T> {
let value: T
init(_ value: T) {
self.value = value
}
}
// MARK: - NSURLSessionTask extensions
private var taskRequestKey = 0
private var dataTaskResponseBufferKey = 0
private var dataTaskCompletionHandlerKey = 0
private extension NSURLSessionDataTask {
// `var request: Request?` is not available in Swift 1.2
// ("protocol can only be used as a generic constraint")
private var request: Box<Any>? {
get {
return objc_getAssociatedObject(self, &taskRequestKey) as? Box<Any>
}
set {
if let value = newValue {
objc_setAssociatedObject(self, &taskRequestKey, value, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
} else {
objc_setAssociatedObject(self, &taskRequestKey, nil, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
private var responseBuffer: NSMutableData {
if let responseBuffer = objc_getAssociatedObject(self, &dataTaskResponseBufferKey) as? NSMutableData {
return responseBuffer
} else {
let responseBuffer = NSMutableData()
objc_setAssociatedObject(self, &dataTaskResponseBufferKey, responseBuffer, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
return responseBuffer
}
}
private var completionHandler: ((NSData, NSURLResponse?, NSError?) -> Void)? {
get {
return (objc_getAssociatedObject(self, &dataTaskCompletionHandlerKey) as? Box<(NSData, NSURLResponse?, NSError?) -> Void>)?.value
}
set {
if let value = newValue {
objc_setAssociatedObject(self, &dataTaskCompletionHandlerKey, Box(value), .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
} else {
objc_setAssociatedObject(self, &dataTaskCompletionHandlerKey, nil, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
}
private extension NSURLSessionDownloadTask {
private var request: Box<Any>? {
get {
return objc_getAssociatedObject(self, &taskRequestKey) as? Box<Any>
}
set {
if let value = newValue {
objc_setAssociatedObject(self, &taskRequestKey, value, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
} else {
objc_setAssociatedObject(self, &taskRequestKey, nil, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
}