gaspersic/go-ethereum
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

cmd/evm: add difficulty calculation to t8n tool (#23353)

Browse Source 
This PR adds functionality to the evm t8n to calculate ethash difficulty. If the caller does not provide a currentDifficulty, but instead provides the parentTimestamp (well, semi-optional, will default to 0 if not given), and parentDifficulty, we can calculate it for him.

The caller can also provide a parentUncleHash. In most, but not all cases, the parent uncle hash also affects the formula. If no such hash is provided (or, if the empty all-zero hash is provided), it's assumed that there were no uncles.
This commit is contained in:
Martin Holst Swende
2021-08-25 15:04:26 +02:00
committed by GitHub
parent efee85378e
commit 84c51bc5ec
8 changed files with 172 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
cmd/evm/internal/t8ntool/transition.go
View File

@ -252,6 +252,20 @@ func Main(ctx *cli.Context) error {
return NewError(ErrorVMConfig, errors.New("EIP-1559 config but missing 'currentBaseFee' in env section"))
}
}
if env := prestate.Env; env.Difficulty == nil {
// If difficulty was not provided by caller, we need to calculate it.
switch {
case env.ParentDifficulty == nil:
return NewError(ErrorVMConfig, errors.New("currentDifficulty was not provided, and cannot be calculated due to missing parentDifficulty"))
case env.Number == 0:
return NewError(ErrorVMConfig, errors.New("currentDifficulty needs to be provided for block number 0"))
case env.Timestamp <= env.ParentTimestamp:
return NewError(ErrorVMConfig, fmt.Errorf("currentDifficulty cannot be calculated -- currentTime (%d) needs to be after parent time (%d)",
env.Timestamp, env.ParentTimestamp))
}
prestate.Env.Difficulty = calcDifficulty(chainConfig, env.Number, env.Timestamp,
env.ParentTimestamp, env.ParentDifficulty, env.ParentUncleHash)
}
// Run the test and aggregate the result
s, result, err := prestate.Apply(vmConfig, chainConfig, txs, ctx.Int64(RewardFlag.Name), getTracer)
if err != nil {