291 lines
11 KiB
Rust
291 lines
11 KiB
Rust
use std::collections::HashMap;
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use anyhow::Result;
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use itertools::Itertools;
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use substreams::{
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pb::substreams::StoreDeltas,
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scalar::BigInt,
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store::{StoreAddBigInt, StoreGet, StoreGetString, StoreNew, StoreSet, StoreSetString},
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};
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use substreams_ethereum::pb::eth;
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use crate::{
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pool_changes::{emit_deltas, emit_eth_deltas},
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pool_factories,
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pools::emit_specific_pools,
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};
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use tycho_substreams::{
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balances::store_balance_changes, contract::extract_contract_changes, prelude::*,
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};
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/// This struct purely exists to spoof the `PartialEq` trait for `Transaction` so we can use it in
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/// a later groupby operation.
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#[derive(Debug)]
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struct TransactionWrapper(Transaction);
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impl PartialEq for TransactionWrapper {
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fn eq(&self, other: &Self) -> bool {
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self.0.hash == other.0.hash
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}
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}
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#[substreams::handlers::map]
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pub fn map_components(
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params: String,
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block: eth::v2::Block,
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) -> Result<BlockTransactionProtocolComponents> {
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// Gather contract changes by indexing `PoolCreated` events and analysing the `Create` call
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// We store these as a hashmap by tx hash since we need to agg by tx hash later
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Ok(BlockTransactionProtocolComponents {
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tx_components: block
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.transactions()
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.filter_map(|tx| {
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let mut components = tx
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.logs_with_calls()
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.filter(|(_, call)| !call.call.state_reverted)
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.filter_map(|(log, call)| {
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pool_factories::address_map(
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call.call
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.address
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.as_slice()
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.try_into()
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.ok()?, // this shouldn't fail
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log,
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call.call,
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tx,
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)
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})
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.collect::<Vec<_>>();
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if let Some(component) = emit_specific_pools(¶ms, tx).expect(
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"An unexpected error occured when parsing params for emitting specific pools",
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) {
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components.push(component)
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}
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if !components.is_empty() {
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Some(TransactionProtocolComponents {
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tx: Some(Transaction {
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hash: tx.hash.clone(),
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from: tx.from.clone(),
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to: tx.to.clone(),
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index: Into::<u64>::into(tx.index),
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}),
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components,
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})
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} else {
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None
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}
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})
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.collect::<Vec<_>>(),
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})
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}
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/// Simply stores the `ProtocolComponent`s with the pool id as the key and tokens as the value
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#[substreams::handlers::store]
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pub fn store_component_tokens(map: BlockTransactionProtocolComponents, store: StoreSetString) {
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map.tx_components
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.iter()
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.flat_map(|tx_components| &tx_components.components)
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.for_each(|component| {
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store.set(
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0,
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format!("pool:{0}", component.id),
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&component
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.tokens
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.iter()
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.map(hex::encode)
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.join(":"),
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);
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});
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}
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/// Since the `PoolBalanceChanged` events administer only deltas, we need to leverage a map and a
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/// store to be able to tally up final balances for tokens in a pool.
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#[substreams::handlers::map]
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pub fn map_relative_balances(
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block: eth::v2::Block,
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tokens_store: StoreGetString,
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) -> Result<BlockBalanceDeltas, anyhow::Error> {
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Ok(BlockBalanceDeltas {
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balance_deltas: {
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let mut deltas: Vec<_> = block
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.transactions()
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.flat_map(|tx| {
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emit_eth_deltas(tx, &tokens_store)
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.into_iter()
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.chain(emit_deltas(tx, &tokens_store))
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})
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.collect();
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// Keep it consistent with how it's inserted in the store. This step is important
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// because we use a zip on the store deltas and balance deltas later.
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deltas.sort_unstable_by(|a, b| a.ord.cmp(&b.ord));
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deltas
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},
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})
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}
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/// It's significant to include both the `pool_id` and the `token_id` for each balance delta as the
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/// store key to ensure that there's a unique balance being tallied for each.
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#[substreams::handlers::store]
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pub fn store_balances(deltas: BlockBalanceDeltas, store: StoreAddBigInt) {
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store_balance_changes(deltas, store)
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}
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/// This is the main map that handles most of the indexing of this substream.
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/// Every contract change is grouped by transaction index via the `transaction_contract_changes`
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/// map. Each block of code will extend the `TransactionContractChanges` struct with the
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/// cooresponding changes (balance, component, contract), inserting a new one if it doesn't exist.
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/// At the very end, the map can easily be sorted by index to ensure the final
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/// `BlockContractChanges` is ordered by transactions properly.
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#[substreams::handlers::map]
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pub fn map_protocol_changes(
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block: eth::v2::Block,
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grouped_components: BlockTransactionProtocolComponents,
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deltas: BlockBalanceDeltas,
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components_store: StoreGetString,
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balance_store: StoreDeltas, // Note, this map module is using the `deltas` mode for the store.
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) -> Result<BlockContractChanges> {
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// We merge contract changes by transaction (identified by transaction index) making it easy to
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// sort them at the very end.
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let mut transaction_contract_changes: HashMap<_, TransactionContractChanges> = HashMap::new();
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// `ProtocolComponents` are gathered from `map_pools_created` which just need a bit of work to
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// convert into `TransactionContractChanges`
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grouped_components
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.tx_components
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.into_iter()
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.for_each(|tx_component| {
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let tx = tx_component.tx.as_ref().unwrap();
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transaction_contract_changes
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.entry(tx.index)
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.or_insert_with(|| TransactionContractChanges {
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tx: Some(tx.clone()),
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contract_changes: vec![],
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component_changes: vec![],
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balance_changes: vec![],
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})
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.component_changes
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.extend_from_slice(
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&(tx_component
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.components
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.into_iter()
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.map(|mut component| {
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component.id = format!("0x{}", component.id);
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component
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})
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.collect::<Vec<_>>()),
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);
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});
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// Balance changes are gathered by the `StoreDelta` based on `TokenExchange`, etc. creating
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// `BalanceDeltas`. We essentially just process the changes that occured to the `store` this
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// block. Then, these balance changes are merged onto the existing map of tx contract changes,
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// inserting a new one if it doesn't exist.
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balance_store
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.deltas
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.into_iter()
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.zip(deltas.balance_deltas)
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.map(|(store_delta, balance_delta)| {
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let new_value_string = String::from_utf8(store_delta.new_value)
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.unwrap()
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.to_string();
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(
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balance_delta.tx.unwrap(),
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BalanceChange {
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token: balance_delta.token,
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balance: BigInt::try_from(new_value_string)
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.unwrap()
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.to_signed_bytes_be(),
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component_id: format!(
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"0x{}",
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String::from_utf8(balance_delta.component_id).unwrap()
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)
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.into(),
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},
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)
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})
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// We need to group the balance changes by tx hash for the `TransactionContractChanges` agg
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.chunk_by(|(tx, _)| TransactionWrapper(tx.clone()))
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.into_iter()
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.for_each(|(tx_wrapped, group)| {
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let tx = tx_wrapped.0;
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transaction_contract_changes
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.entry(tx.index)
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.or_insert_with(|| TransactionContractChanges {
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tx: Some(tx.clone()),
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contract_changes: vec![],
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component_changes: vec![],
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balance_changes: vec![],
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})
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.balance_changes
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.extend(group.map(|(_, change)| change));
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});
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// General helper for extracting contract changes. Uses block, our component store which holds
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// all of our tracked deployed pool addresses, and the map of tx contract changes which we
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// output into for final processing later.
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extract_contract_changes(
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&block,
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|addr| {
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components_store
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.get_last(format!("pool:{0}", hex::encode(addr)))
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.is_some()
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},
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&mut transaction_contract_changes,
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);
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for change in transaction_contract_changes.values_mut() {
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for balance_change in change.balance_changes.iter_mut() {
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replace_eth_address(&mut balance_change.token);
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}
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for component_change in change.component_changes.iter_mut() {
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for token in component_change.tokens.iter_mut() {
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replace_eth_address(token);
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}
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}
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}
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// Process all `transaction_contract_changes` for final output in the `BlockContractChanges`,
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// sorted by transaction index (the key).
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Ok(BlockContractChanges {
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block: Some(Block {
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number: block.number,
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hash: block.hash.clone(),
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parent_hash: block
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.header
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.as_ref()
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.expect("Block header not present")
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.parent_hash
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.clone(),
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ts: block.timestamp_seconds(),
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}),
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changes: transaction_contract_changes
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.drain()
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.sorted_unstable_by_key(|(index, _)| *index)
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.filter_map(|(_, change)| {
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if change.contract_changes.is_empty() &&
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change.component_changes.is_empty() &&
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change.balance_changes.is_empty()
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{
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None
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} else {
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Some(change)
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}
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})
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.collect::<Vec<_>>(),
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})
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}
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fn replace_eth_address(token: &mut Vec<u8>) {
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let eth_address = [238u8; 20]; // 0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
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if *token == eth_address {
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*token = [0u8; 20].to_vec();
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}
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}
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