25 lines
733 B
Swift
25 lines
733 B
Swift
import Foundation
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import PromiseKit
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// https://github.com/mxcl/PromiseKit/blob/master/Documentation/CommonPatterns.md
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func attemptNetworking<T>(
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maximumRetryCount: Int = 3,
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delayBeforeRetry: DispatchTimeInterval = .seconds(2),
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_ body: @escaping () -> Promise<T>
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) -> Promise<T> {
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var attempts = 0
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func attempt() -> Promise<T> {
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attempts += 1
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return body().recover { error -> Promise<T> in
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guard attempts < maximumRetryCount, error is URLError else { throw error }
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if Current.isRunningTests {
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return attempt()
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} else {
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return after(delayBeforeRetry).then(on: .main, attempt)
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}
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}
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}
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return attempt()
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}
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