From 9a935586f36e1d3ba11c04bc828bf0bb1468c3d6 Mon Sep 17 00:00:00 2001
From: sifnoc <sifnoc09@gmail.com>
Date: Mon, 11 Sep 2023 16:10:17 +0000
Subject: [PATCH] chore: removed fetching balances

---
 backend/src/apis/fetch.rs | 83 ---------------------------------------
 backend/src/apis/mod.rs   |  1 -
 2 files changed, 84 deletions(-)
 delete mode 100644 backend/src/apis/fetch.rs

diff --git a/backend/src/apis/fetch.rs b/backend/src/apis/fetch.rs
deleted file mode 100644
index 0c973f79..00000000
--- a/backend/src/apis/fetch.rs
+++ /dev/null
@@ -1,83 +0,0 @@
-use futures::future::try_join_all;
-use std::{error::Error, sync::Arc};
-
-use ethers::{
-    abi::Address,
-    contract::builders::ContractCall,
-    prelude::SignerMiddleware,
-    providers::{Http, Middleware, Provider},
-    signers::LocalWallet,
-    types::{H160, U256},
-};
-
-pub trait TokenBalance<M: Middleware> {
-    fn get_token_balance(&self, address: Address) -> ContractCall<M, U256>;
-}
-
-/// This function takes a list of token contracts, addresses and returns the balances of that address for the queried contracts.
-/// The first balance returned is the Ether (ETH) balance, followed by the balances of other specified token contracts.
-///
-pub async fn fetch_asset_sums<'a, M: Middleware + 'a>(
-    client: Arc<SignerMiddleware<Provider<Http>, LocalWallet>>,
-    token_contracts: Vec<Box<dyn TokenBalance<M> + Send>>,
-    exchange_addresses: Vec<H160>,
-) -> Result<Vec<U256>, Box<dyn Error>> {
-    let mut result: Vec<U256> = Vec::new();
-
-    let mut get_balance_futures = Vec::new();
-    for addr in exchange_addresses.clone() {
-        get_balance_futures.push(client.get_balance(addr, None));
-    }
-    let get_balances = try_join_all(get_balance_futures).await?;
-    let sum_eth_balance = get_balances
-        .into_iter()
-        .reduce(|acc, balance| acc + balance)
-        .unwrap();
-    result.push(sum_eth_balance);
-
-    // Most in case, the number of contracts is less than the number of asset addresses
-    // Iterating over contracts first is more efficient
-    let mut sum_token_balance = U256::zero();
-    for contract in &token_contracts {
-        for addr in exchange_addresses.clone() {
-            let token_balance = contract.get_token_balance(addr).call().await.unwrap();
-            sum_token_balance += token_balance;
-        }
-        result.push(sum_token_balance)
-    }
-
-    Ok(result)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    use crate::contracts::mock::mock_erc20::MockERC20;
-    use crate::tests::initialize_anvil;
-
-    #[tokio::test]
-    async fn test_fetch_asset_sums() {
-        // Necessary to implement `get_balance_from_contract` for the `contracts` parameter by following trait
-        impl<M: Middleware> TokenBalance<M> for MockERC20<M> {
-            fn get_token_balance(&self, address: Address) -> ContractCall<M, U256> {
-                self.balance_of(address)
-            }
-        }
-
-        let (anvil, cex_addr_1, cex_addr_2, client, mock_erc20) = initialize_anvil().await;
-
-        let asset_sums = fetch_asset_sums(
-            client.clone(),
-            vec![Box::new(mock_erc20)],
-            [cex_addr_1, cex_addr_2].to_vec(),
-        )
-        .await
-        .unwrap();
-
-        assert_eq!(asset_sums[0], U256::from(556864));
-        assert_eq!(asset_sums[1], U256::from(556863));
-
-        drop(anvil);
-    }
-}
diff --git a/backend/src/apis/mod.rs b/backend/src/apis/mod.rs
index df26680a..712b5c53 100644
--- a/backend/src/apis/mod.rs
+++ b/backend/src/apis/mod.rs
@@ -1,4 +1,3 @@
 pub mod address_ownership;
 mod csv_parser;
-mod fetch;
 pub mod round;