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