Liquidity.Party/tycho-protocol-sdk
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Clip balances at 0.

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In case we get negative balances, which happens sometimes e.g. in balancer and seems to be due to some rounding issues within the protocol, we simply clip the balance at 0 so we never emit negative balances as tycho-indexer the upstream system will interpret the balance bytes as unsigned integers.
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kayibal
2024-03-14 11:04:41 +00:00
parent 3f5a74260d
commit e70d5f0e86
3 changed files with 122 additions and 51 deletions
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30
substreams/crates/tycho-substreams/src/contract.rs
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@@ -72,19 +72,33 @@ impl From<InterimContractChange> for tycho::ContractChange {
}
}
/// Extracts relevant contract changes from the block.
/// Extracts and aggregates contract changes from a block.
///
/// Contract changes include changes in storage, code and native balance.
/// This function identifies and collects changes to contract storage, code, and native balance for
/// contracts of interest within a given block. It filters contracts based on a user-defined
/// predicate and aggregates changes into a provided mutable map.
///
/// ## Arguments
///
/// * `block` - The block to extract changes from. Must be the extended block model.
/// * `inclusion_predicate` - A predicate function that determines if a contract address is
/// relevant.
/// * `transaction_contract_changes` - A mutable map to store the contract changes in.
/// * `block` - The block from which to extract contract changes, expected to be an extended block
/// model.
/// * `inclusion_predicate` - A closure that determines if a contract's address is of interest for
/// the collection of changes. Only contracts satisfying this predicate are included.
/// * `transaction_contract_changes` - A mutable reference to a map where extracted contract changes
/// are stored. Keyed by transaction index, it aggregates changes into
/// `tycho::TransactionContractChanges`.
///
/// ## Panics
/// Will panic in case the detail level of the block is not extended.
/// Panics if the provided block is not an extended block model, as indicated by its detail level.
///
/// ## Operation
/// The function iterates over transactions and their calls within the block, collecting contract
/// changes (storage, balance, code) that pass the inclusion predicate. Changes are then sorted by
/// their ordinals to maintain the correct sequence of events. Aggregated changes for each contract
/// are stored in `transaction_contract_changes`, categorized by transaction index.
///
/// Contracts created within the block are tracked to differentiate between new and existing
/// contracts. The aggregation process respects transaction boundaries, ensuring that changes are
/// mapped accurately to their originating transactions.
pub fn extract_contract_changes<F: Fn(&[u8]) -> bool>(
block: &eth::v2::Block,
inclusion_predicate: F,