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| @@ -0,0 +1,78 @@ | ||
| // | ||
| // RequestCoordinator.swift | ||
| // | ||
| // Copyright © 2019 Button, Inc. All rights reserved. (https://usebutton.com) | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in all | ||
| // copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| // SOFTWARE. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
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| internal protocol RequestCoordinatorType { | ||
| func enqueueRetriableRequest(request: URLRequest, | ||
| attempt: Int, | ||
| maxRetries: Int, | ||
| retryIntervalInMS: Int, | ||
| _ completion: @escaping (Data?, Error?) -> Void) | ||
| } | ||
|
|
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| internal final class RequestCoordinator: RequestCoordinatorType { | ||
|
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| var session: URLSessionType | ||
|
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| required init(session: URLSessionType) { | ||
| self.session = session | ||
| } | ||
|
|
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| func enqueueRetriableRequest(request: URLRequest, | ||
| attempt: Int, | ||
| maxRetries: Int, | ||
| retryIntervalInMS: Int, | ||
| _ completion: @escaping (Data?, Error?) -> Void) { | ||
| let task = session.dataTask(with: request) { data, response, error in | ||
|
|
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| var shouldRetry = true | ||
| if let response = response as? HTTPURLResponse, | ||
| data != nil { | ||
| switch response.statusCode { | ||
| case 500...599: | ||
| shouldRetry = true | ||
| default: | ||
| shouldRetry = false | ||
| } | ||
| } | ||
|
|
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| guard shouldRetry, attempt + 1 <= maxRetries else { | ||
| completion(data, error) | ||
| return | ||
| } | ||
|
|
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| var delay = retryIntervalInMS | ||
| delay *= attempt == 0 ? 1 : 2 << (attempt - 1) | ||
| DispatchQueue.main.asyncAfter(deadline: .now() + Double(delay) / 1000.0, execute: { | ||
| self.enqueueRetriableRequest(request: request, | ||
| attempt: attempt + 1, | ||
| maxRetries: maxRetries, | ||
| retryIntervalInMS: retryIntervalInMS, | ||
| completion) | ||
| }) | ||
| } | ||
| task.resume() | ||
| } | ||
| } |
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