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Re-do rent collection check on rent-exempt account (bp #11349) (#11655)

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* Re-do rent collection check on rent-exempt account (#11349)

* wip: re-do rent collection check on rent-exempt account

* Let's see how the ci goes

* Restore previous code

* Well, almost all new changes are revertable

* Update doc

* Add test and gating

* Fix tests

* Fix tests, especially avoid to change abi...

* Fix more tests...

* Fix snapshot restore

* Align to _new_ with better uninitialized detection

(cherry picked from commit 23fa84b322)

# Conflicts:
#	core/src/rpc_subscriptions.rs

* Fix conflicts

Co-authored-by: Ryo Onodera <ryoqun@gmail.com>
This commit is contained in:
mergify[bot]
2020-08-17 07:20:24 +00:00
committed by GitHub
parent 9015e47cc5
commit d9ae092637
9 changed files with 138 additions and 42 deletions
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docs/src/implemented-proposals/rent.md
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@@ -24,11 +24,11 @@ Even if those processes are out of scope of rent collection, all of manipulated
## Actual processing of collecting rent
Rent is due for one epoch's worth of time, and accounts always have `Account::rent_epoch` of `current_epoch + 1`.
Rent is due for one epoch's worth of time, and accounts have `Account::rent_epoch` of `current_epoch` or `current_epoch + 1` depending on the rent regime.
If the account is in the exempt regime, `Account::rent_epoch` is simply pushed to `current_epoch + 1`.
If the account is in the exempt regime, `Account::rent_epoch` is simply updated to `current_epoch`.
If the account is non-exempt, the difference between the next epoch and `Account::rent_epoch` is used to calculate the amount of rent owed by this account \(via `Rent::due()`\). Any fractional lamports of the calculation are truncated. Rent due is deducted from `Account::lamports` and `Account::rent_epoch` is updated to the next epoch. If the amount of rent due is less than one lamport, no changes are made to the account.
If the account is non-exempt, the difference between the next epoch and `Account::rent_epoch` is used to calculate the amount of rent owed by this account \(via `Rent::due()`\). Any fractional lamports of the calculation are truncated. Rent due is deducted from `Account::lamports` and `Account::rent_epoch` is updated to `current_epoch + 1` (= next epoch). If the amount of rent due is less than one lamport, no changes are made to the account.
Accounts whose balance is insufficient to satisfy the rent that would be due simply fail to load.