[英]RxAlamofire: retryWhen drops into subscribe block
I'm trying to implement an alamofire call with max retries. 我正在尝试使用max retries实现alamofire调用。 Code is below:
代码如下:
RxAlamofire.request(.post, URL, parameters: parameters, encoding: JSONEncoding.default)
.observeOn(MainScheduler.instance)
.retryWhen { (errors: Observable<Error>) in
return errors.flatMapWithIndex { (e, a) -> Observable<Int64> in
if a >= self.RETRY_COUNT - 1 {
return Observable.error(e)
}
print("Error: delay server call retry by \(a+1) second(s)")
return Observable<Int64>.timer(RxTimeInterval(a+1), scheduler: MainScheduler.instance)
}
}
.subscribe(
onNext: {
(result) in
print("I get here when retrying...")
},
onError: { (error) in
print(error)
}
)
.addDisposableTo(self.disposeBag)
Unfortunately, on retrying, I get into the onNext block in subscribe - I don't want to get there until I have a result. 不幸的是,在重试时,我进入了订阅中的onNext块 - 我不希望到达那里直到我得到结果。 (The onError gives an error after max retries is exceeded as expected).
(按预期超出最大重试次数后,onError会出错)。 Please can someone help?
请有人帮忙吗?
I have tried to reproduce your scenario, but the following code does not trigger the onNext closure in the subscription upon an error. 我试图重现您的方案,但以下代码在出错时不会触发订阅中的onNext闭包。 I have rewritten your code slightly, my example always errors out.
我稍微重写了你的代码,我的例子总是出错。 I am using RxSwift 4.0.0.
我正在使用RxSwift 4.0.0。
let count = 2
enum MyError: Error {
case crash
}
_ = Observable<Int>.error(MyError.crash)
.debug("prior")
.retryWhen { errors in
return errors.enumerated().flatMap { (index, error) -> Observable<Void> in
guard index < count - 1 else { return .error(error) }
print("Error: delay server call retry by \(index + 1) second(s)")
return Observable<Void>.just(()).delay(RxTimeInterval(index + 1), scheduler: MainScheduler.instance)
}
}
.debug("after")
.subscribe(onNext: { element in
print("got next element: \(element)")
})
This results in the following output. 这导致以下输出。
2018-03-16 09:05:16.921: after -> subscribed 2018-03-16 09:05:16.924: prior -> subscribed 2018-03-16 09:05:16.924: prior -> Event error(blok) Error: delay server call retry by 1 second(s) 2018-03-16 09:05:16.925: prior -> isDisposed 2018-03-16 09:05:17.926: prior -> subscribed 2018-03-16 09:05:17.926: prior -> Event error(blok) 2018-03-16 09:05:17.927: after -> Event error(blok) 2018-03-16 09:05:17.928: after -> isDisposed 2018-03-16 09:05:17.928: prior -> isDisposed
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