Implement non standard json rpc methods for dev mode

[mshakeg]

Typical development evm's such as hardhat's local node, truffle's ganache local blockchain or foundry's revm all implement functionality to override and manipulate evm state for the purposes of local debugging and testing which are typically exposed via json rpc methods(though foundry doesn't appear to do so, however, exposes such functionality via the Vm interface).

The list of these methods supported by these different development frameworks can be found here:

• hardhat network methods
• ganache
• foundry cheat codes

It's possible that methods may have different names across these frameworks but the functionality is identical, so to maximise compatibility for projects new or existing that are written in a particular framework all methods can be exposed by the hedera developer json rpc that would map to the same handler/controller e.g. hardhat_mine and evm_mineBlockNumber do the same thing but in different ways, i.e. they both advance the evm to a certain block number, but hardhat_mine requires you to specify by how many blocks from the current block, whereas evm_mineBlockNumber requires you to specify the exact block to mine.

Some of the most useful methods for local testing are:

• evm_snapshot & evm_revert
• evm_increaseTime
• evm_setTime
• evm_freezeTime
• evm_mine
• evm_mineBlockNumber
• miner_start
• miner_stop
• evm_setAutomine
• evm_setIntervalMining
• evm_setNextBlockTimestamp
• evm_setAccountBalance

Additionally, hardhat's console.log is useful for debugging.

A method specific to Hedera would be evm_setNativePrice which set's the USD price for HBAR which can be retrieved via the IExchangeRate interface.