Can't reject retry promise

[piroznoe]

Why I can't reject promise at some point of time?

Version: 1.2.8

 let promise = retry(attempts: 100, delay: 1) {
    Promise(0).validate { _ in false }
  }

  DispatchQueue.main.asyncAfter(deadline: .now() + 10) {
    promise.reject(.canceled)
  }

[chuckhays]

To cancel a retry block you would need to use the condition parameter:

  var shouldContinue = true

  let promise = retry(attempts: 100, delay: 1, condition: { attempsRemaining, error in
    return shouldContinue
  }) {
    Promise(0).validate { _ in false }
  }

  DispatchQueue.main.asyncAfter(deadline: .now() + 10) {
    shouldContinue = false
  }

[piroznoe]

I have already used this solution But it is confusing, why I can’t reject promise with reject method

[chuckhays]

You can reject the promise the way you suggested, and it will call the .catch block on the promise, but it will not stop the retry attempts from executing.

[piroznoe]

let promise = retry(attempts: 100, delay: 1) {
   Promise(0).validate { _ in false }
}.catch { error in
  // error block 1
}

promise.catch { error in
  // error block 2
}

promise.catch { error in
  // error block 3
}

Only block 2 and 3 will be called after calling promise.reject(.canceled). Is it expected behaviour?

[chuckhays]

If you reject promise in that example you are rejecting the promise returned by the .catch function, which isn't the same promise object from the retry block.

A simplified example without retry:

    let p1 = Promise<String>.pending()
    p1.then { s in
      print("Then block: \(s)")
    }
    let p2 = p1.catch { e in
      print("Error block 1: \(e)")
    }
    p2.catch { e in
      print("Error block 2: \(e)")
    }
    p2.catch { e in
      print("Error block 3: \(e)")
    }
    p2.reject(NSError(domain: "test", code: -1))

Rejecting p2 will print only blocks 2 and 3, but rejecting p1 would print all 3 catch blocks.