Update EIP-7251: return fee from getter and add usage example #9025
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same comment as here: #9024 (comment) |
The get operation is meant to be used by contracts to compute the exact amount of ether required to add a request. It does not return the fee directly though, but it returns the count of 'excess requests' instead. The caller has to compute the fee themselves by applying the fee formula. I think this is not great. The fee logic, while reasonably straightforward, is an implementation detail of the contract. Duplicating it into caller contracts could lead to a mismatch in the computed values, and it's not necessary. I propose we change the system contract to return the fee directly. This contract change has also been submitted in this PR: lightclient/sys-asm#33 The Rationale section of the EIP also had some outdated text about returning fee overage to the caller. The contract does not return overage, so I am removing that section here, and adding recommendations & example code for calling the contract.
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mkalinin
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The get operation is meant to be used by contracts to compute the exact amount of ether required to add a request. It does not return the fee directly though, but it returns the count of 'excess requests' instead. The caller has to compute the fee themselves by applying the fee formula.
I think this is not great. The fee logic, while reasonably straightforward, is an implementation detail of the contract. Duplicating it into caller contracts could lead to a mismatch in the computed values, and it's not necessary. I propose we change the system contract to return the fee directly. This contract change has also been submitted in this PR: lightclient/sys-asm#33
I'm also adding recommendations & example code for calling the contract.
Related change to EIP-7002: #9024