External cost recorder #170
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@sorpaas depends on rust-blockchain/evm-tests#24 |
sorpaas
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Jun 8, 2023
sorpaas
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Jun 19, 2023
tgmichel
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with-substrate feature
sorpaas
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Jun 21, 2023
| @@ -50,7 +49,7 @@ pub enum Apply<I> { | |||
| } | |||
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| /// EVM backend. | |||
| #[auto_impl::auto_impl(&, Arc, Box)] | |||
| //#[auto_impl::auto_impl(&, Arc, Box)] | |||
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Can we still implement this for &mut and Box?
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Anyway, I'm fine keeping this as is for now.
A refactoring we can do is to move record_external_operation into a separate trait Record, and then add yet another type parameter to StackExecutor R: Record. Then we can uncomment this again.
But the changes are already huge so we can do that in a separate PR.
sorpaas
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Jun 21, 2023
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Please create a companion PR in the |
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* update PrecompileHandle ref: rust-ethereum/evm#122 * update fee calculation ref: rust-ethereum/evm#132 * add code_size/code_hash fn in StackState trait ref: rust-ethereum/evm#140 * update evm call stack ref: rust-ethereum/evm#136 * update evm call stack ref: rust-ethereum/evm#155 * add shanghai eips 3651, 3855, 3860 ref: rust-ethereum/evm#152 * update is_precompile ref: rust-ethereum/evm#157 * fix eip-3860 ref: rust-ethereum/evm#160 * update runtime config ref: rust-ethereum/evm#161 * add eip-4399 ref: rust-ethereum/evm#162 * fix eip-2618 ref: rust-ethereum/evm#163 * fix nonce back to U256 ref: rust-ethereum/evm#166 * remove exit_substate in create functions ref: rust-ethereum/evm#168 * record external cost ref: rust-ethereum/evm#170 * add record_external_operation ref: rust-ethereum/evm#171 * add storage_growth ref: rust-ethereum/evm#173 * update evm * switch to shanghai hardfork * update ecrecover ref: polkadot-evm/frontier#964 (#2696)
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This PR proposes adding 3 new methods to
StackStatetrait (and 2 additional counterparts inPrecompileHandle) behind awith-substratefeature flag. This change is forced by additional resource restrictions in parachains and leaves the native gasometer logic and code totally unchanged.With this new interface implementors can have a capacity for any required metric in the
Backend. This way, prior to executing anyOpcode(inpre_validate), there is an attempt to record this new external cost(s), and much like in the case of the gasometer, it will proceed with the Opcode execution or fail (OutOfGas) if the capacity for the external metric is exhausted.As a whole, this PR is proposed in favor of alternative designs that would support this type of functionality, like for example being generic over the
Gastype in the native gasometer. Those proposals were preliminarily discarded for being too intrusive for the evm code, given this is not an standard feature and can be solved in theBackend.The methods introduced in
StackStateare:record_external_dynamic_opcode_cost: meant to be called prior to executing an Opcode (pre_validate). Calculates the amount of external resources needed for the given Opcode, and records the cost.record_external_cost: meant to be called fromrecord_external_dynamic_opcode_costimplementation and fromPrecompileHandleimplementor. Records a cost (deducts an amount from the resource pool).refund_external_cost: meant to be called fromrecord_external_dynamic_opcode_costimplementation and fromPrecompileHandleimplementor. Refunds a cost (sums an amount from the resource pool).The methods introduced in
PrecompileHandleare:record_external_cost: meant to interface withStackState.refund_external_cost: meant to interface withStackState.In addition to the feature-specific additions, in this PR there are some additional changes included that are needed to properly fail the gasometer in case any of this external resources are exhausted.