Fix: check promise results before executing XCC callbacks #693
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birchmd
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## [2.9.0] 2023-04-05 ### Added - Enabled XCC for mainnet release by [@birchmd]. ([#694]) - Added `set_owner` contract method which sets the owner of the contract by [@hskang9]. ([#690]) - New variant of submit function `submit_with_args` which accepts additional arguments along with the transaction such as the max gas price a user is ready to pay by [@aleksuss]. ([#696]) - Added the ability to create and fund XCC sub-accounts from external NEAR accounts by [@birchmd]. ([#735]) ### Changes - Replaced `rjson` with `serde_json` by [@aleksuss]. ([#677]) - Changed owner intended contract methods to now require owner or the contract itself by [@hskang9]. ([#676]) ### Fixes - Fixed nonce incorrectly being incremented on an out of fund failure by [@joshuajbouw]. ([#671]) - Fixed a check in promise results before executing cross contract calls (XCC) callbacks by [@birchmd]. ([#693]) - Fixed a reachable panic in `receive_erc20_tokens` by [@0x3bfc]. ([#709]) - Fixed a lack of minimum size checks when instantiating a new `EthGas` object by [@lempire123]. ([#722]) - Fixed a lack of division by 0 checks in `EthGas::Div()` by [@lempire123]. ([#718]) - Fixed the validation of the return of `exports:storage_remove` by [@0x3bfc]. ([#712]) - Fixed missing account validations of NEAR account IDs by [@0x3bfc]. ([#703]) - Fixed a reachable panic in the `exitToNear` and `exitToEthereum` precompiles if the input amount is greater than 1^128 when cast from a `U256` to `u128` by [@0x3bfc]. ([#681]) - Fixed a reachable panic in `modExp` due to arithmetic overflow by [@0x3bfc]. ([#688]) - Fixed the ability attaching values to Aurora specific precompiles, this no longer is possible, by [@0x3bfc]. ([#714]) - Fixed a return error if an ecrecover signature length is not exactly 65 by [@0x3bfc]. ([#717]) - Fixed size checks on input array passed to `exitToNear` and `exitToEthereum` precompiles by [@0x3bfc]. ([#684]) - Fixed missing gas costs in `exitToNear` and `exitToEthereum` precompiles by [@lempire123]. ([#687]) - Fixed a reachable panic due to out of memory in the `modExp` precompile by [@0x3bfc]. ([#689]) - Fixed an assurance that the `sender_id` has a balance greater than the amount in `ft_transfer_call` by [@0x3bfc]. ([#708]) - Fixed returning `0x` when a length cannot be cast as `usize` instead of returning an error in the `modExp` precompile by [@birchmd]. ([#737]) - Miscellaneous minor fixes by [@0x3bfc]. ([#738]) --------- Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: Leandro Casuso Montero <leandro.montero@aurora.dev> Co-authored-by: Michael Birch <michael.birch@aurora.dev> Co-authored-by: Alexey Lapitsky <lex@realisticgroup.com> Co-authored-by: Oleksandr Anyshchenko <oleksandr.anyshchenko@aurora.dev> Co-authored-by: Alexey Lapitsky <alexey.lapitsky@aurora.dev> Co-authored-by: Hyungsuk Kang <hskang9@gmail.com> Co-authored-by: Ahmed Ali <ahmedaabdulwahed@gmail.com> Co-authored-by: lempire123 <61431140+lempire123@users.noreply.github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
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Description
On Near every promise in a chain of callbacks will execute regardless of the success/failure of previous promises in the chain. We need to explicitly check for success of past promises before continuing.
Testing
This is pretty tricky to test because we already had many checks in place to ensure that promises would not be failing before executing the chain in the first place. These checks are mostly a safety net for if something totally unexpected occurs. My standpoint is that if this change doesn't break any of the existing xcc tests then it should be ok. The code is simple enough that a careful review should reveal any problems with it.