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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| use crate::eth::web3_transport::Web3Transport; | ||
| use crate::eth::{EthCoin, ERC20_CONTRACT}; | ||
| use crate::{CoinsContext, MmCoinEnum}; | ||
| use ethabi::Token; | ||
| use ethereum_types::Address; | ||
| use futures_util::TryFutureExt; | ||
| use mm2_core::mm_ctx::MmArc; | ||
| use mm2_err_handle::mm_error::MmResult; | ||
| use web3::types::{BlockId, BlockNumber, CallRequest}; | ||
| use web3::{Transport, Web3}; | ||
|
|
||
| async fn call_erc20_function<T: Transport>( | ||
| web3: &Web3<T>, | ||
| token_addr: Address, | ||
| function_name: &str, | ||
| ) -> Result<Vec<Token>, String> { | ||
| let function = try_s!(ERC20_CONTRACT.function(function_name)); | ||
| let data = try_s!(function.encode_input(&[])); | ||
| let request = CallRequest { | ||
| from: Some(Address::default()), | ||
| to: Some(token_addr), | ||
| gas: None, | ||
| gas_price: None, | ||
| value: Some(0.into()), | ||
| data: Some(data.into()), | ||
| ..CallRequest::default() | ||
| }; | ||
|
|
||
| let res = web3 | ||
| .eth() | ||
| .call(request, Some(BlockId::Number(BlockNumber::Latest))) | ||
| .map_err(|e| ERRL!("{}", e)) | ||
| .await?; | ||
| function.decode_output(&res.0).map_err(|e| ERRL!("{}", e)) | ||
| } | ||
|
|
||
| pub(crate) async fn get_token_decimals(web3: &Web3<Web3Transport>, token_addr: Address) -> Result<u8, String> { | ||
| let tokens = call_erc20_function(web3, token_addr, "decimals").await?; | ||
| let Some(token) = tokens.into_iter().next() else { | ||
| return ERR!("No value returned from decimals() call"); | ||
| }; | ||
| let Token::Uint(dec) = token else { | ||
| return ERR!("Expected Uint token for decimals, got {:?}", token); | ||
| }; | ||
| Ok(dec.as_u64() as u8) | ||
| } | ||
|
|
||
| async fn get_token_symbol(coin: &EthCoin, token_addr: Address) -> Result<String, String> { | ||
| let web3 = try_s!(coin.web3().await); | ||
| let tokens = call_erc20_function(&web3, token_addr, "symbol").await?; | ||
| let Some(token) = tokens.into_iter().next() else { | ||
| return ERR!("No value returned from symbol() call"); | ||
| }; | ||
| let Token::String(symbol) = token else { | ||
| return ERR!("Expected String token for symbol, got {:?}", token); | ||
| }; | ||
| Ok(symbol) | ||
| } | ||
|
|
||
| #[derive(Serialize)] | ||
| pub struct Erc20TokenInfo { | ||
| pub symbol: String, | ||
| pub decimals: u8, | ||
| } | ||
|
|
||
| pub async fn get_erc20_token_info(coin: &EthCoin, token_addr: Address) -> Result<Erc20TokenInfo, String> { | ||
| let symbol = get_token_symbol(coin, token_addr).await?; | ||
| let web3 = try_s!(coin.web3().await); | ||
| let decimals = get_token_decimals(&web3, token_addr).await?; | ||
| Ok(Erc20TokenInfo { symbol, decimals }) | ||
| } | ||
|
|
||
| /// Finds if an ERC20 token is in coins config by its contract address and returns its ticker. | ||
| pub fn get_erc20_ticker_by_contract_address(ctx: &MmArc, platform: &str, contract_address: &str) -> Option<String> { | ||
| ctx.conf["coins"].as_array()?.iter().find_map(|coin| { | ||
| let protocol = coin.get("protocol")?; | ||
| let protocol_type = protocol.get("type")?.as_str()?; | ||
| if protocol_type != "ERC20" { | ||
| return None; | ||
| } | ||
| let protocol_data = protocol.get("protocol_data")?; | ||
| let coin_platform = protocol_data.get("platform")?.as_str()?; | ||
| let coin_contract_address = protocol_data.get("contract_address")?.as_str()?; | ||
|
|
||
| if coin_platform == platform && coin_contract_address == contract_address { | ||
| coin.get("coin")?.as_str().map(|s| s.to_string()) | ||
| } else { | ||
| None | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| /// Finds an enabled ERC20 token by its contract address and returns it as `MmCoinEnum`. | ||
| pub async fn get_enabled_erc20_by_contract( | ||
| ctx: &MmArc, | ||
| contract_address: Address, | ||
| ) -> MmResult<Option<MmCoinEnum>, String> { | ||
| let cctx = CoinsContext::from_ctx(ctx)?; | ||
| let coins = cctx.coins.lock().await; | ||
|
|
||
| Ok(coins.values().find_map(|coin| match &coin.inner { | ||
| MmCoinEnum::EthCoin(eth_coin) if eth_coin.erc20_token_address() == Some(contract_address) => { | ||
| Some(coin.inner.clone()) | ||
| }, | ||
| _ => None, | ||
| })) | ||
| } |
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