WIP: Two new cheatcodes to enable Forge scripts to send Flashbots bundles #4948
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cli/Cargo.toml
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| @@ -25,6 +25,7 @@ ui = { path = "../ui" } | |||
| # eth | |||
| ethers = { workspace = true, features = ["rustls"] } | |||
| solang-parser = "=0.2.4" | |||
| ethers-flashbots = { git = "https://github.com/onbjerg/ethers-flashbots" } | |||
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Should tie it to a specific version e.g. 0.13.0.
| }) | ||
| .collect::<Result<Vec<_>>>()?; | ||
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| trace!(target: "script", "sequence: {:#?}", &sequence); |
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I would say it's best to either:
- remove this trace and just keep the full
transactionstrace on L90 or - remove the trace on L90 and add a trace for
flashbots_sequencehere.
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| let client = FlashbotsMiddleware::new( | ||
| provider.clone(), | ||
| Url::parse("https://relay.flashbots.net")?, |
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We should probably also support the goerli flashbots relay, even though it can be annoying to get a tx in there, people might want to test against that.
| @@ -41,6 +41,8 @@ pub struct TransactionWithMetadata { | |||
| pub transaction: TypedTransaction, | |||
| pub additional_contracts: Vec<AdditionalContract>, | |||
| pub is_fixed_gas_limit: bool, | |||
| pub bundle_block: Option<U64>, | |||
| pub bundle_gas: Option<U256>, | |||
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Might be overkill, but I do think having the bundle details in a separate struct and then wrapped in one Option would be nicer because it seems they are both always checked together and also both must always be present.
| @@ -39,6 +39,8 @@ pub const DEFAULT_CREATE2_DEPLOYER: H160 = H160([ | |||
| #[derive(Debug, Clone, Default)] | |||
| pub struct BroadcastableTransaction { | |||
| pub rpc: Option<RpcUrl>, | |||
| pub bundle_block: Option<U64>, | |||
| pub bundle_gas: Option<U256>, | |||
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Same here re having bundle details in one struct.
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Leaving this PR open as I would like to see native support (tracking here: #4947) for private transactions but it will likely be better to start from scratch given the update to Alloy, deprecation of Related PR: #4931 introduces the Related Alloy Flashbots support: https://github.com/leruaa/alloy-mev |
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Still supportive but given the required changes I think it makes sense that we go back to the drawing board before proceeding, leaving #4947 open to cover the request |
Motivation
I wanted to be able to easily send flashbots bundles within forge scripts for use-cases involving transactions that cannot hit public mempools for security reasons (e.g. MEV-able transactions, whitehat rescues, etc).
Solution
Two new cheatcodes,
vm.startBundle(target_block_number, gas_price)andvm.stopBundle(), which allow users to send flashbots bundles in foundry scripts, for example like this:This is a draft PR as this is a work in progress, and I'm also very new to Rust, so may not have built this optimally. I'd like to get feedback and code review from the community if possible.