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client commands: cosmos-to-eth and eth-to-cosmos should use amount ve…
…rbatim (#132) * gravity-client {cosmos-to-eth,eth-to-cosmos} commands should _not_ manipulate the amount provided by the user * burn off duplicate fraction_to_exponent
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Original file line number | Diff line number | Diff line change |
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@@ -1,40 +1,3 @@ | ||
use clarity::Address as EthAddress; | ||
use clarity::Uint256; | ||
use std::{time::Duration, u128}; | ||
use web30::{client::Web3, jsonrpc::error::Web3Error}; | ||
use std::{time::Duration}; | ||
|
||
pub const TIMEOUT: Duration = Duration::from_secs(60); | ||
|
||
/// TODO revisit this for higher precision while | ||
/// still representing the number to the user as a float | ||
/// this takes a number like 0.37 eth and turns it into wei | ||
/// or any erc20 with arbitrary decimals | ||
pub fn fraction_to_exponent(num: f64, exponent: u8) -> Uint256 { | ||
let mut res = num; | ||
// in order to avoid floating point rounding issues we | ||
// multiply only by 10 each time. this reduces the rounding | ||
// errors enough to be ignored | ||
for _ in 0..exponent { | ||
res *= 10f64 | ||
} | ||
(res as u128).into() | ||
} | ||
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||
pub async fn get_erc20_decimals( | ||
web3: &Web3, | ||
erc20: EthAddress, | ||
caller_address: EthAddress, | ||
) -> Result<Uint256, Web3Error> { | ||
let decimals = web3 | ||
.contract_call(erc20, "decimals()", &[], caller_address, None) | ||
.await?; | ||
|
||
Ok(Uint256::from_bytes_be(match decimals.get(0..32) { | ||
Some(val) => val, | ||
None => { | ||
return Err(Web3Error::ContractCallError( | ||
"Bad response from ERC20 decimals".to_string(), | ||
)) | ||
} | ||
})) | ||
} | ||
pub const TIMEOUT: Duration = Duration::from_secs(60); |