Option to simulate a reorg for a local fork mode

[krasi-georgiev]

Component

Anvil

Describe the feature you would like

Add an api to simulate a block reorg for local fork mode

Additional context

When writing tests for bots and libraries It would help to simulate reorgs to see how the library/bot handles it.

[mattsse]

I think this some hybrid of reset and snapshot perhaps?

what should anvil do on a reorg(block) call?

[krasi-georgiev]

Something like this?

head block is 1, calling reors(1) would create block 2 with block 1 as an uncle including all TX from block 1

later could even expand it as
head block is 1, calling reors(1,[]txs{1,2}) would create block 2 with block 1 as an uncle including only TX 1 and 2 from block 1

[sambacha]

you can do this with the admin commands as well see https://github.com/spalladino/reorg-tester

[krasi-georgiev]

@sambacha thanks for sharing.
@mattsse what do you think would it be possible to do the same in Anvil?

[krasi-georgiev]

@mattsse what do you think?

[krasi-georgiev]

ping

[mattsse]

sorry, missed this update,

head block is 1, calling reors(1) would create block 2 with block 1 as an uncle including all TX from block 1

that should be possible

so we need:

• reorg rpc call that accepts
  • block where to reorg (default 1)
  • tx filter object

I think we can start with 1 block reorg, but how should it behave if we're on block 5 and want to do a 3 block reorg for example?

[krasi-georgiev]

maybe to keep things simple can just start by allowing to reorg only the last block and if there is a request for bigger reorgs can revisit again.

[agnarsong]

There hasn't been any follow-up on this issue for 22 years. It seems to have been forgotten.

[ameya-deshmukh]

@mattsse any chance I could take this up? This would be very helpful for a lot of applications imo.