94 lines
2.8 KiB
Rust
94 lines
2.8 KiB
Rust
// 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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//! Sends HTTP notifications to a list of URLs every time new work is available.
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extern crate ethash;
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extern crate fetch;
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extern crate parity_runtime;
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extern crate url;
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extern crate hyper;
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use self::fetch::{Fetch, Request, Client as FetchClient, Method};
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use self::parity_runtime::Executor;
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use self::ethash::SeedHashCompute;
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use self::url::Url;
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use self::hyper::header::{self, HeaderValue};
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use ethereum_types::{H256, U256};
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use parking_lot::Mutex;
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use futures::Future;
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/// Trait for notifying about new mining work
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pub trait NotifyWork : Send + Sync {
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/// Fired when new mining job available
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fn notify(&self, pow_hash: H256, difficulty: U256, number: u64);
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}
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/// POSTs info about new work to given urls.
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pub struct WorkPoster {
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urls: Vec<Url>,
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client: FetchClient,
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executor: Executor,
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seed_compute: Mutex<SeedHashCompute>,
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}
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impl WorkPoster {
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/// Create new `WorkPoster`.
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pub fn new(urls: &[String], fetch: FetchClient, executor: Executor) -> Self {
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let urls = urls.into_iter().filter_map(|u| {
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match Url::parse(u) {
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Ok(url) => Some(url),
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Err(e) => {
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warn!("Error parsing URL {} : {}", u, e);
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None
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}
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}
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}).collect();
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WorkPoster {
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client: fetch,
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executor: executor,
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urls: urls,
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seed_compute: Mutex::new(SeedHashCompute::default()),
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}
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}
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}
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impl NotifyWork for WorkPoster {
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fn notify(&self, pow_hash: H256, difficulty: U256, number: u64) {
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// TODO: move this to engine
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let target = ethash::difficulty_to_boundary(&difficulty);
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let seed_hash = &self.seed_compute.lock().hash_block_number(number);
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let seed_hash = H256::from_slice(&seed_hash[..]);
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let body = format!(
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r#"{{ "result": ["0x{:x}","0x{:x}","0x{:x}","0x{:x}"] }}"#,
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pow_hash, seed_hash, target, number
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);
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for u in &self.urls {
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let u = u.clone();
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self.executor.spawn(self.client.fetch(
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Request::new(u.clone(), Method::POST)
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.with_header(header::CONTENT_TYPE, HeaderValue::from_static("application/json"))
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.with_body(body.clone()), Default::default()
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).map_err(move |e| {
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warn!("Error sending HTTP notification to {} : {}, retrying", u, e);
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}).map(|_| ()));
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}
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}
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}
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