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🔥 Attempt all downloads, reject with first error

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Chris Araman 2021-05-06 18:48:24 -07:00
parent 9f340bdce9
commit 25045fa0dd
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1 changed files with 13 additions and 3 deletions
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16
Sources/MasKit/AppStore/Downloader.swift
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@ -15,10 +15,20 @@ import StoreFoundation
/// - Parameter appIDs: The IDs of the apps to be downloaded
/// - Parameter purchase: Flag indicating whether the apps needs to be purchased.
/// Only works for free apps. Defaults to false.
/// - Returns: A promise that completes when the downloads are complete.
/// - Returns: A promise that completes when the downloads are complete. If any fail,
/// the promise is rejected with the first error, after all remaining downloads are attempted.
func downloadAll(_ appIDs: [UInt64], purchase: Bool = false) -> Promise<Void> {
appIDs.reduce(Promise<Void>.value) { promise, appID in
promise.then { download(appID, purchase: purchase) }
var firstError: Error?
return appIDs.reduce(Guarantee<Void>.value(())) { previous, appID in
previous.then { download(appID, purchase: purchase).recover { error in
if firstError == nil {
firstError = error
}
} }
}.done {
if let error = firstError {
throw error
}
}
}