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feature: Add support for block validation (flashbots_validateBuilderSubmissionV3) #7335

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feature: Add support for block validation (flashbots_validateBuilderSubmissionV3) #7335

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rjnrohit
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@rjnrohit rjnrohit commented Aug 16, 2024 •
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Closes #7462

This PR aims to implement flashbots endpoint (flashbots_validateBuilderSubmissionV3) ref: https://github.com/flashbots/builder/blob/df9c765067d57ab4b2d0ad39dbb156cbe4965778/eth/block-validation/api.go#L225-L246

  1. It validates the sent payload's block, blobs and verifies if the ParentHash, BlockHash, GasLimit, and GasUsed in the params.Message match the sent payload and produce an error otherwise.
  2. It tries to imitate block processing step and also process withdrawals
  3. It tries to validate proposer payment using Txns & receipts generated in the block processing step

Changes

It introduces a new JsonRpc plugin called Nethermind.Flashbots which implements a new endpoint called flashbots_validateBuilderSubmissionV3

Types of changes

What types of changes does your code introduce?

  • Bugfix (a non-breaking change that fixes an issue)
  • New feature (a non-breaking change that adds functionality)
  • Breaking change (a change that causes existing functionality not to work as expected)
  • Optimization
  • Refactoring
  • Documentation update
  • Build-related changes
  • Other: Description

Testing

Requires testing

  • Yes
  • No

If yes, did you write tests?

  • Yes
  • No

Notes on testing

I'll write the tests once I'm done with manual testing

@rjnrohit rjnrohit marked this pull request as ready for review September 5, 2024 12:36
@rjnrohit rjnrohit requested a review from rubo as a code owner September 5, 2024 12:36
LukaszRozmej
LukaszRozmej requested changes Sep 9, 2024
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src/Nethermind/Nethermind.Consensus/Processing/ReadOnlyTxProcessingEnv.cs Outdated Show resolved Hide resolved
src/Nethermind/Nethermind.BlockValidation/BlockValidation.cs Outdated Show resolved Hide resolved
src/Nethermind/Nethermind.BlockValidation/IFlashbotsRpcModule.cs Outdated Show resolved Hide resolved
src/Nethermind/Nethermind.Consensus/IGasLimitCalculator.cs Outdated Show resolved Hide resolved
src/Nethermind/Nethermind.BlockValidation/Handlers/ValidateBuilderSubmissionHandler.cs Outdated Show resolved Hide resolved
src/Nethermind/Nethermind.BlockValidation/Handlers/ValidateBuilderSubmissionHandler.cs Outdated Show resolved Hide resolved
src/Nethermind/Nethermind.BlockValidation/Handlers/ValidateBuilderSubmissionHandler.cs Outdated
Comment on lines 126 to 130
if (!_blockTree.IsBetterThanHead(block.Header))
{
error = $"Block {block.Header.Hash} is not better than head";
return false;
}
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We can validate only on future blocks?

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Yeah it seems from this snippet: https://github.com/flashbots/builder/blob/df9c765067d57ab4b2d0ad39dbb156cbe4965778/core/blockchain.go#L2464

definition at: https://github.com/flashbots/builder/blob/df9c765067d57ab4b2d0ad39dbb156cbe4965778/core/forkchoice.go#L77

src/Nethermind/Nethermind.BlockValidation/Handlers/ValidateBuilderSubmissionHandler.cs Outdated Show resolved Hide resolved
src/Nethermind/Nethermind.BlockValidation/Handlers/ValidateBuilderSubmissionHandler.cs Outdated Show resolved Hide resolved
src/Nethermind/Nethermind.BlockValidation/Handlers/ValidateBuilderSubmissionHandler.cs Outdated
Comment on lines 322 to 326
if (block is not null && !ValidateBlobsBundle(block.Transactions, blobsBundle, out string? blobsError))
{
if (_logger.IsWarn) _logger.Warn($"Invalid blobs bundle. Result of {payloadStr}. Error: {blobsError}");
return BlockValidationResult.Invalid(blobsError ?? "Blobs bundle validation failed");
}
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A but weird that we do validations after processing a block, shouldn't we do it first? (It would be less costly)

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https://github.com/flashbots/builder/blob/df9c765067d57ab4b2d0ad39dbb156cbe4965778/eth/block-validation/api.go#L240

I followed the same order as they did, but yeah I agree doing this way would be costly

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W should consider changing it later, maybe @Ruteri knows why this is the order of checks?

rjnrohit and others added 14 commits September 12, 2024 15:24
@rjnrohit
address PR comments
ffc25f0
@LukaszRozmej
Hookup BlockValidation plugin in Nethermind.Runner
1bebf60
@core-repository-dispatch-app @LukaszRozmej @rjnrohit
Update Fast Sync configuration in Nethermind repository (#7401)
570dce0 
Co-authored-by: LukaszRozmej <[email protected]>
@LukaszRozmej @MarekM25
@smartprogrammer93 @rjnrohit
Feature/geth like system tx (#7252)
bec7a5d 
Co-authored-by: MarekM25 <[email protected]>
Co-authored-by: Ahmad Bitar <[email protected]>
@Arindam2407 @LukaszRozmej
@marcindsobczak @rjnrohit
Heuristic tx censorship detection (#7259)
8b8cd01 
Co-authored-by: lukasz.rozmej <[email protected]>
Co-authored-by: Marcin Sobczak <[email protected]>
@emlautarom1 @LukaszRozmej
@jmederosalvarado @rjnrohit
Refactor TxValidator (#7386)
69e36dd 
Co-authored-by: Lukasz Rozmej <[email protected]>
Co-authored-by: Jorge Mederos <[email protected]>
@MarekM25 @rjnrohit
Moved BlockProductionTimeout to config, increased BlockProductionTime…
17533eb 
…out (#7378)
@benaadams @rjnrohit
Reduce memory use during Archive Sync (#7407)
c1f9455
@MarekM25 @rjnrohit
Update Supported Networks in Readme (#7412)
5aebe9b
@benaadams @rjnrohit
Change Windows native Allocator (#7418)
37b9fb4
@benaadams @rjnrohit
Fast address equals (#7417)
4a17264
@benaadams @rjnrohit
Reduce backlog threshold for GC (#7415)
413a5b3
@kamilchodola @rjnrohit
Bump unstable to 1.29.0 (#7416)
bb3753d
@rjnrohit
enable flashBots module
4373e5a
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@LukaszRozmej LukaszRozmej LukaszRozmej requested changes

@rubo rubo Awaiting requested review from rubo rubo is a code owner

@MarekM25 MarekM25 Awaiting requested review from MarekM25

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Implement flashbots endpoint (flashbots_validateBuilderSubmissionV3)
7 participants
@rjnrohit @LukaszRozmej @Arindam2407 @emlautarom1 @MarekM25 @benaadams @kamilchodola