refactor(memory): memory usage improvements

mm2src/adex_cli/src/scenarios/mm2_proc_mng.rs

@@ -347,10 +347,11 @@ pub(crate) fn get_status() {
         .filter(|line| line.contains("PID"))
         .last()
     {
-        let pid = found
-            .trim()
+        let chars = found.trim();
+
+        let pid = chars
             .matches(char::is_numeric)
-            .fold(String::default(), |mut pid, ch| {
+            .fold(String::with_capacity(chars.len()), |mut pid, ch| {
                 pid.push_str(ch);
                 pid
             });

mm2src/coins/eth.rs

@@ -638,8 +638,10 @@ impl EthCoinImpl {
 
     /// The id used to differentiate payments on Etomic swap smart contract
     pub(crate) fn etomic_swap_id(&self, time_lock: u32, secret_hash: &[u8]) -> Vec<u8> {
-        let mut input = vec![];
-        input.extend_from_slice(&time_lock.to_le_bytes());
+        let timelock_bytes = time_lock.to_le_bytes();
+
+        let mut input = Vec::with_capacity(timelock_bytes.len() + secret_hash.len());
+        input.extend_from_slice(&timelock_bytes);
         input.extend_from_slice(secret_hash);
         sha256(&input).to_vec()
     }
@@ -4082,8 +4084,11 @@ impl EthCoin {
         address: Address,
     ) -> Result<CoinBalanceMap, MmError<BalanceError>> {
         let coin = || self;
-        let mut requests = Vec::new();
-        for (token_ticker, info) in self.get_erc_tokens_infos() {
+
+        let tokens = self.get_erc_tokens_infos();
+        let mut requests = Vec::with_capacity(tokens.len());
+
+        for (token_ticker, info) in tokens {
             let fut = async move {
                 let balance_as_u256 = coin()
                     .get_token_balance_for_address(address, info.token_address)

mm2src/coins/lightning/ln_p2p.rs

@@ -110,7 +110,6 @@ fn netaddress_from_ipaddr(addr: IpAddr, port: u16) -> Vec<NetAddress> {
     if addr == Ipv4Addr::new(0, 0, 0, 0) || addr == Ipv4Addr::new(127, 0, 0, 1) {
         return Vec::new();
     }
-    let mut addresses = Vec::new();
     let address = match addr {
         IpAddr::V4(addr) => NetAddress::IPv4 {
             addr: u32::from(addr).to_be_bytes(),
@@ -121,8 +120,7 @@ fn netaddress_from_ipaddr(addr: IpAddr, port: u16) -> Vec<NetAddress> {
             port,
         },
     };
-    addresses.push(address);
-    addresses
+    vec![address]
 }
 
 pub async fn ln_node_announcement_loop(

mm2src/coins/lightning/ln_sql.rs

@@ -1056,7 +1056,7 @@ mod tests {
 
     fn generate_random_channels(num: u64) -> Vec<DBChannelDetails> {
         let mut rng = rand::thread_rng();
-        let mut channels = vec![];
+        let mut channels = Vec::with_capacity(num.try_into().expect("Shouldn't overflow."));
         let s = Secp256k1::new();
         let mut bytes = [0; 32];
         for _i in 0..num {
@@ -1108,7 +1108,7 @@ mod tests {
 
     fn generate_random_payments(num: u64) -> Vec<PaymentInfo> {
         let mut rng = rand::thread_rng();
-        let mut payments = vec![];
+        let mut payments = Vec::with_capacity(num.try_into().expect("Shouldn't overflow."));
         let s = Secp256k1::new();
         let mut bytes = [0; 32];
         for _ in 0..num {

mm2src/coins/lightning/ln_utils.rs

@@ -162,7 +162,7 @@ pub async fn init_channel_manager(
         let (channel_manager_blockhash, channel_manager, channelmonitors) = async_blocking(move || {
             let mut manager_file = File::open(persister.manager_path())?;
 
-            let mut channel_monitor_mut_references = Vec::new();
+            let mut channel_monitor_mut_references = Vec::with_capacity(channelmonitors.len());
             for (_, channel_monitor) in channelmonitors.iter_mut() {
                 channel_monitor_mut_references.push(channel_monitor);
             }

mm2src/coins/nft/storage/wasm/wasm_storage.rs

@@ -44,6 +44,7 @@ where
     I: Iterator<Item = NftListTable>,
 {
     let mut filtered_nfts = Vec::new();
+
     for nft_table in nfts {
         let nft = nft_details_from_item(nft_table)?;
         match filters {
@@ -82,6 +83,7 @@ where
     I: Iterator<Item = NftTransferHistoryTable>,
 {
     let mut filtered_transfers = Vec::new();
+
     for transfers_table in transfers {
         let transfer = transfer_details_from_item(transfers_table)?;
         match filters {
@@ -705,7 +707,7 @@ impl NftTransferHistoryStorageOps for NftCacheIDBLocked<'_> {
         let table = db_transaction.table::<NftTransferHistoryTable>().await?;
 
         let items = table.get_items("chain", chain.to_string()).await?;
-        let mut token_addresses = HashSet::new();
+        let mut token_addresses = HashSet::with_capacity(items.len());
         for (_item_id, item) in items.into_iter() {
             let transfer = transfer_details_from_item(item)?;
             token_addresses.insert(transfer.common.token_address);

mm2src/coins/qrc20.rs

@@ -1503,8 +1503,10 @@ impl MmCoin for Qrc20Coin {
 }
 
 pub fn qrc20_swap_id(time_lock: u32, secret_hash: &[u8]) -> Vec<u8> {
-    let mut input = vec![];
-    input.extend_from_slice(&time_lock.to_le_bytes());
+    let timelock_bytes = time_lock.to_le_bytes();
+    let mut input = Vec::with_capacity(timelock_bytes.len() + secret_hash.len());
+
+    input.extend_from_slice(&timelock_bytes);
     input.extend_from_slice(secret_hash);
     sha256(&input).to_vec()
 }

mm2src/coins/tendermint/tendermint_coin.rs

@@ -458,7 +458,7 @@ impl TendermintCommons for TendermintCoin {
         let platform_balance = big_decimal_from_sat_unsigned(platform_balance_denom, self.decimals);
         let ibc_assets_info = self.tokens_info.lock().clone();
 
-        let mut requests = Vec::new();
+        let mut requests = Vec::with_capacity(ibc_assets_info.len());
         for (denom, info) in ibc_assets_info {
             let fut = async move {
                 let balance_denom = self

mm2src/coins/utxo/rpc_clients.rs

@@ -2172,7 +2172,7 @@ impl ElectrumClient {
                             Ok(headers) => headers,
                             Err(e) => return MmError::err(UtxoRpcError::InvalidResponse(format!("{:?}", e))),
                         };
-                        let mut block_registry: HashMap<u64, BlockHeader> = HashMap::new();
+                        let mut block_registry: HashMap<u64, BlockHeader> = HashMap::with_capacity(block_headers.len());
                         let mut starting_height = from_height;
                         for block_header in &block_headers {
                             block_registry.insert(starting_height, block_header.clone());

mm2src/coins/utxo/utxo_common.rs

@@ -2706,7 +2706,7 @@ async fn get_unspents_for_inputs(
         .map_err(|err| RawTransactionError::InvalidParam(err.to_string()))?;
 
     let mut prev_script = None;
-    let mut unspents_loaded = vec![];
+    let mut unspents_loaded = Vec::with_capacity(inputs.len());
 
     for input in inputs {
         let prev_tx = prev_txns_loaded

mm2src/coins/utxo_signer/src/with_key_pair.rs

@@ -45,7 +45,7 @@ pub fn sign_tx(
     signature_version: SignatureVersion,
     fork_id: u32,
 ) -> UtxoSignWithKeyPairResult<UtxoTx> {
-    let mut signed_inputs = vec![];
+    let mut signed_inputs = Vec::with_capacity(unsigned.inputs.len());
     match signature_version {
         SignatureVersion::WitnessV0 => {
             for (i, _) in unsigned.inputs.iter().enumerate() {

mm2src/coins/z_coin/storage/walletdb/wasm/storage.rs

@@ -894,7 +894,7 @@ impl WalletRead for WalletIndexedDb {
         let accounts_table = db_transaction.table::<WalletDbAccountsTable>().await?;
         let maybe_accounts = accounts_table.get_items("ticker", &self.ticker).await?;
 
-        let mut res_accounts: HashMap<AccountId, ExtendedFullViewingKey> = HashMap::new();
+        let mut res_accounts: HashMap<AccountId, ExtendedFullViewingKey> = HashMap::with_capacity(maybe_accounts.len());
         for (_, account) in maybe_accounts {
             let extfvk =
                 decode_extended_full_viewing_key(self.params.hrp_sapling_extended_full_viewing_key(), &account.extfvk)
@@ -1053,7 +1053,7 @@ impl WalletRead for WalletIndexedDb {
 
         // Retrieves a list of transaction IDs (id_tx) from the transactions table
         // that match the provided account ID and have not been spent (spent IS NULL).
-        let mut witnesses = vec![];
+        let mut witnesses = Vec::with_capacity(maybe_witnesses.len());
         for (_, witness) in maybe_witnesses {
             let id_note = witness.note.to_i64().unwrap();
             let id_note = NoteId::ReceivedNoteId(id_note.to_i64().expect("invalid value"));

mm2src/coins/z_coin/z_rpc.rs

@@ -397,7 +397,7 @@ impl ZRpcOps for NativeClient {
         for height in start_block..=last_block {
             let block = self.get_block_by_height(height).await?;
             debug!("Got block {:?}", block);
-            let mut compact_txs = Vec::new();
+            let mut compact_txs = Vec::with_capacity(block.tx.len());
             // By default, CompactBlocks only contain CompactTxs for transactions that contain Sapling spends or outputs.
             // Create and push compact_tx during iteration.
             for (tx_id, hash_tx) in block.tx.iter().enumerate() {

mm2src/coins/z_coin/z_tx_history.rs

@@ -91,7 +91,7 @@ pub(crate) async fn fetch_tx_history_from_db(
         .await?;
 
     // Process transactions and construct tx_details
-    let mut tx_details = vec![];
+    let mut tx_details = Vec::new();
     for (tx_id, tx) in txs {
         if let Some((_, WalletDbBlocksTable { height, time, .. })) = blocks
             .iter()

mm2src/coins_activation/src/eth_with_token_activation.rs

@@ -138,7 +138,7 @@ impl TokenInitializer for Erc20Initializer {
         &self,
         activation_params: Vec<TokenActivationParams<Erc20TokenActivationRequest, Erc20Protocol>>,
     ) -> Result<Vec<EthCoin>, MmError<EthTokenActivationError>> {
-        let mut tokens = vec![];
+        let mut tokens = Vec::with_capacity(activation_params.len());
         for param in activation_params {
             let token: EthCoin = self
                 .platform_coin

mm2src/coins_activation/src/slp_token_activation.rs

@@ -100,8 +100,7 @@ impl TokenActivationOps for SlpToken {
         )?;
         let balance = token.my_coin_balance().await.mm_err(EnableSlpError::GetBalanceError)?;
         let my_address = token.my_address()?;
-        let mut balances = HashMap::new();
-        balances.insert(my_address, balance);
+        let balances = HashMap::from([(my_address, balance)]);
         let init_result = SlpInitResult {
             balances,
             token_id: (*token.token_id()).into(),

mm2src/coins_activation/src/spl_token_activation.rs

@@ -106,8 +106,7 @@ impl TokenActivationOps for SplToken {
             .await
             .map_err(|e| SplInitError::GetBalanceError(e.into_inner()))?;
         let my_address = token.my_address()?;
-        let mut balances = HashMap::new();
-        balances.insert(my_address, balance);
+        let balances = HashMap::from([(my_address, balance)]);
         let init_result = SplInitResult {
             balances,
             token_contract_address: token.conf.token_contract_address.to_string(),

mm2src/coins_activation/src/tendermint_token_activation.rs

@@ -65,8 +65,7 @@ impl TokenActivationOps for TendermintToken {
             .mm_err(|e| TendermintTokenInitError::CouldNotFetchBalance(e.to_string()))?;
 
         let my_address = token.my_address()?;
-        let mut balances = HashMap::new();
-        balances.insert(my_address, balance);
+        let balances = HashMap::from([(my_address, balance)]);
 
         let init_result = TendermintTokenInitResult {
             balances,

mm2src/common/shared_ref_counter/src/enable.rs

@@ -57,8 +57,7 @@ impl<T> SharedRc<T> {
     #[track_caller]
     pub fn new(inner: T) -> Self {
         let index = 0;
-        let mut existing_pointers = HashMap::new();
-        existing_pointers.insert(index, Location::caller());
+        let existing_pointers = HashMap::from([(index, Location::caller())]);
 
         Self {
             inner: Arc::new(inner),

mm2src/mm2_bitcoin/keys/src/cashaddress.rs

@@ -364,7 +364,7 @@ mod base32 {
     /// `encode` converts an input byte array into a base32 string.
     /// It expects the byte array to be 5-bit packed.
     pub fn encode(input: &[u8]) -> Result<String, String> {
-        let mut output = String::new();
+        let mut output = String::with_capacity(input.len());
 
         for i in input {
             let i = *i as usize;
@@ -380,7 +380,7 @@ mod base32 {
     /// `decode` takes a string in base32 format and returns a byte array that is
     /// 5-bit packed.
     pub fn decode(input: &str) -> Result<Vec<u8>, String> {
-        let mut output = Vec::new();
+        let mut output = Vec::with_capacity(input.len());
         for c in input.chars() {
             let cpos = c as usize;
             if cpos >= CHARSET_REV.len() {

mm2src/mm2_bitcoin/spv_validation/src/lib.rs

@@ -31,7 +31,7 @@ pub(crate) mod test_utils {
 
     use self::serde::Deserialize;
 
-    use std::{fs::File, io::Read, panic, string::String, vec, vec::Vec};
+    use std::{panic, vec, vec::Vec};
 
     #[derive(Deserialize)]
     pub(crate) struct TestCase {
@@ -40,11 +40,8 @@ pub(crate) mod test_utils {
     }
 
     fn setup() -> serde_json::Value {
-        let mut file = File::open("./src/for_tests/spvTestVectors.json").unwrap();
-        let mut data = String::new();
-        file.read_to_string(&mut data).unwrap();
-
-        serde_json::from_str(&data).unwrap()
+        let data = include_str!("./for_tests/spvTestVectors.json");
+        serde_json::from_str(data).unwrap()
     }
 
     fn to_test_case(val: &serde_json::Value) -> TestCase {

mm2src/mm2_main/src/lp_ordermatch.rs

@@ -2275,16 +2275,12 @@ fn broadcast_keep_alive_for_pub(ctx: &MmArc, pubkey: &str, orderbook: &Orderbook
     };
 
     for (alb_pair, root) in state.trie_roots.iter() {
-        let mut trie_roots = HashMap::new();
-
         if *root == H64::default() && *root == hashed_null_node::<Layout>() {
             continue;
         }
 
-        trie_roots.insert(alb_pair.clone(), *root);
-
         let message = new_protocol::PubkeyKeepAlive {
-            trie_roots,
+            trie_roots: HashMap::from([(alb_pair.clone(), *root)]),
             timestamp: now_sec(),
         };
 
@@ -5383,12 +5379,12 @@ pub struct HistoricalOrder {
 }
 
 pub async fn orders_kick_start(ctx: &MmArc) -> Result<HashSet<String>, String> {
-    let mut coins = HashSet::new();
     let ordermatch_ctx = try_s!(OrdermatchContext::from_ctx(ctx));
 
     let storage = MyOrdersStorage::new(ctx.clone());
     let saved_maker_orders = try_s!(storage.load_active_maker_orders().await);
     let saved_taker_orders = try_s!(storage.load_active_taker_orders().await);
+    let mut coins = HashSet::with_capacity((saved_maker_orders.len() * 2) + (saved_taker_orders.len() * 2));
 
     {
         let mut maker_orders_ctx = ordermatch_ctx.maker_orders_ctx.lock();

mm2src/mm2_main/src/lp_ordermatch/orderbook_rpc.rs

@@ -95,7 +95,7 @@ pub async fn orderbook_rpc(ctx: MmArc, req: Json) -> Result<Response<Vec<u8>>, S
 
     let mut asks = match orderbook.unordered.get(&(base_ticker.clone(), rel_ticker.clone())) {
         Some(uuids) => {
-            let mut orderbook_entries = Vec::new();
+            let mut orderbook_entries = Vec::with_capacity(uuids.len());
             for uuid in uuids {
                 let ask = orderbook.order_set.get(uuid).ok_or(ERRL!(
                     "Orderbook::unordered contains {:?} uuid that is not in Orderbook::order_set",
@@ -114,15 +114,15 @@ pub async fn orderbook_rpc(ctx: MmArc, req: Json) -> Result<Response<Vec<u8>>, S
             }
             orderbook_entries
         },
-        None => Vec::new(),
+        None => vec![],
     };
     asks.sort_unstable_by(|ask1, ask2| ask1.price_rat.cmp(&ask2.price_rat));
     let (mut asks, total_asks_base_vol, total_asks_rel_vol) = build_aggregated_entries(asks);
     asks.reverse();
 
     let mut bids = match orderbook.unordered.get(&(rel_ticker, base_ticker)) {
         Some(uuids) => {
-            let mut orderbook_entries = vec![];
+            let mut orderbook_entries = Vec::with_capacity(uuids.len());
             for uuid in uuids {
                 let bid = orderbook.order_set.get(uuid).ok_or(ERRL!(
                     "Orderbook::unordered contains {:?} uuid that is not in Orderbook::order_set",

mm2src/mm2_main/src/lp_stats.rs

@@ -254,8 +254,7 @@ pub async fn start_version_stat_collection(ctx: MmArc, req: Json) -> NodeVersion
         let relay_addr = RelayAddress::from_str(&address)?;
         let multi_address = relay_addr.try_to_multiaddr(network_info)?;
 
-        let mut addresses = HashSet::new();
-        addresses.insert(multi_address);
+        let addresses = HashSet::from([multi_address]);
         add_reserved_peer_addresses(&ctx, peer_id, addresses);
     }
 

mm2src/mm2_main/src/lp_swap/maker_swap.rs

@@ -711,7 +711,7 @@ impl MakerSwap {
         };
         drop(send_abort_handle);
 
-        let mut swap_events = vec![];
+        let mut swap_events = Vec::with_capacity(2);
         let instructions = match payload.instructions() {
             Some(instructions) => {
                 let maker_lock_duration =

mm2src/mm2_main/src/lp_swap/taker_swap.rs

@@ -1338,7 +1338,7 @@ impl TakerSwap {
         };
         drop(abort_send_handle);
 
-        let mut swap_events = vec![];
+        let mut swap_events = Vec::with_capacity(3);
         let instructions = match payload.instructions() {
             Some(instructions) => {
                 match self