fix: added staking.claimed() in replacement of staking.ledger().legacyClaimedRewards

[bee344]

Description

After the staking pallet was upgraded to v14 in Polkadot, legacyClaimedRewards is no longer used, so any for any eras after 1418, the era is no longer stored there but in staking.claimed(Era, Account), so querying the former would make it look like the rewards weren't claimed when in turn they were, as you can see here:

With this PR it checks the staking pallet version, and if it's less than 14, it sticks to the old logic, otherwise staking.claimed takes the place of legacyClaimedRewards, as seen here.

With this fix, it returns the correct status:

NOTE staking.claimed() returns the page of the claimed reward, while legacyClaimedRewards instead contains the list of eras claimed. So we assume that if staking.claimed() returns anything other than an empty array, the era was claimed.

Edit: added image of response after fix
Edit 2: wrong era

[marshacb]

lgtm!

[TarikGul]

This is an awesome call. Has this been around for a bit? Is it safe to use historically?

[bee344]

Well, it has been around since v13. Before that it was api.query.staking.storageVersion() and it returned a type Releases first and then PalletStakingReleases, that went from V0 to V12_0_0

[Imod7]

I have serious doubts about using staking.palletVersion.

By adding this check here for older eras even if legacyClaimedRewards has values it is skipping and checking the claimedRewards which does not have any values for that era. So then it does not return payouts.

Example
For account 1123RekaPHgWaPL5v9qfsikRemeZdYC4tvKXYuLXwhfT3NKy and era 1366 it should give payouts but it does not.

http://127.0.0.1:8080/accounts/1123RekaPHgWaPL5v9qfsikRemeZdYC4tvKXYuLXwhfT3NKy/staking-payouts?unclaimedOnly=false&era=1366

Payouts shown in Subscan

[bee344]

I made some changes and reduced the use of the stakingVersion. The bug you mention was a few lines below, but I changed it so that if the stakingVersion is below 14, it goes with the old logic, but if it's not, instead of replacing validatorLedger.legacyClaimedRewards with claimedRewards, the value of the era gets added to the array.

[Imod7]

If we add this check here, whenever the staking pallet version is >= 14, variable claimed will result to true correct ? That does not seem right but maybe I am missing something.

[bee344]

Awesome catch! That's right, I changed it and should not happen now

[Imod7]

Suggested change

	} else if (stakingVersion < 14) {
	validatorLedger = validatorLedgerOption.unwrap();
	} else {
	validatorLedger = validatorLedgerOption.unwrap();
	const claimed = await historicApi.query.staking.claimedRewards(era, validatorControllerOption.unwrap());
	if (claimed.length > 0) {
	validatorLedger.legacyClaimedRewards.push(era as unknown as u32);
	}
	}
	validatorLedger = validatorLedgerOption.unwrap();
	if (historicApi.query.staking.claimedRewards) {
	const claimed = await historicApi.query.staking.claimedRewards(era, validatorControllerOption.unwrap());
	if (claimed.length > 0) {
	const eraVal: u32 = historicApi.registry.createType('u32', era);
	validatorLedger.legacyClaimedRewards.push(eraVal);
	}

1. Since in both cases we unwrap, we can put it outside the ifs and that way we call it once.

2. We could avoid checking stakingVersion if we just check if claimedRewards exists. That way we don't need an extra call or to pass stakingVersion through the methods.

3. I changed how you push the era because if we push era as unknown as u32, it messes up with the types of the Vec.

   • If you check in debug mode validatorLedger.legacyClaimedRewards you will see before the push it is
   • Type(8) [u32, u32, u32, u32, u32, u32, u32, u32
   • and after adding the additional era, it becomes Type(8) [u32, u32, u32, u32, u32, u32, u32, u32, 6585
   • and then calls like validatorLedger.legacyClaimedRewards.toHuman() also break

   Note: the use of createType is discouraged but in this case, I only found this way to make it work.

4. Since we do not use the variable claimed we do not have to store the call. We could just do

   • if ((await historicApi.query.staking.claimedRewards(era, validatorControllerOption.unwrap())).length > 0) {
   • but this is up to you! By storing, the code is also more clear also so yeah.

5. Question: Why when it retrieves the claimedRewards for the era the result is 0 ? is it something to be fixed in pjs-api ?

[bee344]

1. Done.
2. Done.
3. Nice one, done.
4. Done.
5. claimedRewards returns the index of the reward pages that were claimed. So if only the first page was claimed, it returns 0, if pages 1 and 2, 0,1, and so on.

[Imod7]

There is another thing to take into account either in this PR or I will add an issue to make the change in the future.
legacyClaimed... will be removed (related PR) so when this happens, this line

validatorLedger.legacyClaimedRewards.push(eraVal);

will break. For now we can add a check if it exists

if (validatorLedger.legacyClaimedRewards) {
...
}