[pallet-revive] Add evm codegen #5926
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This PR introduces the necessary changes to pallet-revive for integrating with our Ethereum JSON-RPC. The RPC proxy itself will be added in a follow up. ## Changes - A new pallet::call `Call::eth_transact`. This is used as a wrapper to accept unsigned Ethereum transaction, valid call will be routed to `Call::call` or `Call::instantiate_with_code` - A custom UncheckedExtrinsic struct, that wraps the generic one usually and add the ability to check eth_transact calls sent from an Ethereum JSON-RPC proxy. - Generated types and traits to support implementing a JSON-RPC Ethereum proxy. ## Flow Overview: - A user submits a transaction via MetaMask or another Ethereum-compatible wallet. - The proxy dry run the transaction and add metadata to the call (gas limit in Weight, storage deposit limit, and length of bytecode and constructor input for contract instantiation) - The raw transaction, along with the additional metadata, is submitted to the node as an unsigned extrinsic. - On the runtime, our custom UncheckedExtrinsic define a custom Checkable implementation that converts the unsigned extrinsics into checked one - It recovers the signer - validates the payload, and injects signed extensions, allowing the system to increment the nonce and charge the appropriate fees. - re-route the call to pallet-revive::Call::call or pallet-revive::Call::instantiateWithCode ## Dependencies - paritytech/polkavm#188 ## Follow up PRs - #5926 - #6147 (previously #5953) - #5502 --------- Co-authored-by: Alexander Theißen <[email protected]> Co-authored-by: Cyrill Leutwiler <[email protected]>
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Adds the code generator used to generate the types and methods of the JSON-RPC proxy