feat(substreams): add substreams for Uniswap v2 and v3

substreams/ethereum-uniswap-v3/src/modules/3_map_balance_changes.rs

@@ -0,0 +1,40 @@
+use anyhow::Ok;
+use substreams::store::{StoreGet, StoreGetProto};
+use substreams_ethereum::pb::eth::v2::{self as eth};
+use substreams_helper::hex::Hexable;
+
+use crate::{
+    events::get_log_changed_balances,
+    pb::uniswap::v3::{BalanceDeltas, Pool},
+};
+
+#[substreams::handlers::map]
+pub fn map_balance_changes(
+    block: eth::Block,
+    pools_store: StoreGetProto<Pool>,
+) -> Result<BalanceDeltas, anyhow::Error> {
+    let mut balances_deltas = Vec::new();
+    for trx in block.transactions() {
+        let mut tx_deltas = Vec::new();
+        for log in trx
+            .calls
+            .iter()
+            .filter(|call| !call.state_reverted)
+            .flat_map(|call| &call.logs)
+        {
+            // Skip if the log is not from a known uniswapV3 pool.
+            if let Some(pool) =
+                pools_store.get_last(format!("{}:{}", "Pool", &log.address.to_hex()))
+            {
+                tx_deltas.extend(get_log_changed_balances(log, &pool))
+            } else {
+                continue;
+            }
+        }
+        if !tx_deltas.is_empty() {
+            balances_deltas.extend(tx_deltas);
+        }
+    }
+
+    Ok(BalanceDeltas { deltas: balances_deltas })
+}