I want to implement some features as precompiled contracts in Ethereum. I read some articles and the contract code, but I still don't know how to do this.
Is there's a tutorial from scratch?
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This is good reference that do a new pre-compile contract for Ethereum next hardfork named Istanbul
https://github.com/keep-network/go-ethereum/pull/4/files
Basically, you only need to implement two methods of pre-compiled contract interface
- RequiredGas(): to define how many gas user need to pay when calling the pre-compiled contract.
- Run(): write your code to do the thing that you want the pre-compiled contract will do.
By the way, the issue for us is official solidity compiler might not support our pre-compiled function then the only way that user can use our pre-compiled function is use inline assembly code in solidity smart contract.
Hope this will give you some clue to start!
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2If you make sure that your preconpiled contact follows the ABI spec, then you can simply treat it as a contact in solidity, no assembly required Jul 18 '19 at 12:21