openethereum/miner/src/gas_price_calibrator.rs

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// Copyright 2015-2018 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Auto-updates minimal gas price requirement from a price-info source.
use std::time::{Instant, Duration};
use ansi_term::Colour;
use ethereum_types::U256;
use futures_cpupool::CpuPool;
use price_info::{Client as PriceInfoClient, PriceInfo};
use price_info::fetch::Client as FetchClient;
/// Options for the dynamic gas price recalibrator.
#[derive(Debug, PartialEq)]
pub struct GasPriceCalibratorOptions {
/// Base transaction price to match against.
pub usd_per_tx: f32,
/// How frequently we should recalibrate.
pub recalibration_period: Duration,
}
/// The gas price validator variant for a `GasPricer`.
#[derive(Debug, PartialEq)]
pub struct GasPriceCalibrator {
options: GasPriceCalibratorOptions,
next_calibration: Instant,
price_info: PriceInfoClient,
}
impl GasPriceCalibrator {
/// Create a new gas price calibrator.
pub fn new(options: GasPriceCalibratorOptions, fetch: FetchClient, p: CpuPool) -> GasPriceCalibrator {
GasPriceCalibrator {
options: options,
next_calibration: Instant::now(),
price_info: PriceInfoClient::new(fetch, p),
}
}
pub(crate) fn recalibrate<F: FnOnce(U256) + Sync + Send + 'static>(&mut self, set_price: F) {
trace!(target: "miner", "Recalibrating {:?} versus {:?}", Instant::now(), self.next_calibration);
if Instant::now() >= self.next_calibration {
let usd_per_tx = self.options.usd_per_tx;
trace!(target: "miner", "Getting price info");
self.price_info.get(move |price: PriceInfo| {
trace!(target: "miner", "Price info arrived: {:?}", price);
let usd_per_eth = price.ethusd;
let wei_per_usd: f32 = 1.0e18 / usd_per_eth;
let gas_per_tx: f32 = 21000.0;
let wei_per_gas: f32 = wei_per_usd * usd_per_tx / gas_per_tx;
info!(target: "miner", "Updated conversion rate to Ξ1 = {} ({} wei/gas)", Colour::White.bold().paint(format!("US${:.2}", usd_per_eth)), Colour::Yellow.bold().paint(format!("{}", wei_per_gas)));
set_price(U256::from(wei_per_gas as u64));
});
self.next_calibration = Instant::now() + self.options.recalibration_period;
}
}
}