openethereum/miner/src/work_notify.rs
Niklas Adolfsson 98b7c07171 Update license header and scripts (#8666)
* Update `add_license` script

* run script

* add `remove duplicate lines script` and run it

* Revert changes `English spaces`

* strip whitespaces

* Revert `GPL` in files with `apache/mit license`

* don't append `gpl license` in files with other lic

* Don't append `gpl header` in files with other lic.

* re-ran script

* include c and cpp files too

* remove duplicate header

* rebase nit
2018-06-04 10:19:50 +02:00

102 lines
3.0 KiB
Rust

// 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/>.
//! Sends HTTP notifications to a list of URLs every time new work is available.
extern crate ethash;
extern crate fetch;
extern crate parity_reactor;
extern crate url;
extern crate hyper;
use self::fetch::{Fetch, Request, Client as FetchClient, Method};
use self::parity_reactor::Remote;
use self::ethash::SeedHashCompute;
use self::url::Url;
use self::hyper::header::ContentType;
use ethereum_types::{H256, U256};
use parking_lot::Mutex;
use futures::Future;
/// Trait for notifying about new mining work
pub trait NotifyWork : Send + Sync {
/// Fired when new mining job available
fn notify(&self, pow_hash: H256, difficulty: U256, number: u64);
}
/// POSTs info about new work to given urls.
pub struct WorkPoster {
urls: Vec<Url>,
client: FetchClient,
remote: Remote,
seed_compute: Mutex<SeedHashCompute>,
}
impl WorkPoster {
/// Create new `WorkPoster`.
pub fn new(urls: &[String], fetch: FetchClient, remote: Remote) -> Self {
let urls = urls.into_iter().filter_map(|u| {
match Url::parse(u) {
Ok(url) => Some(url),
Err(e) => {
warn!("Error parsing URL {} : {}", u, e);
None
}
}
}).collect();
WorkPoster {
client: fetch,
remote: remote,
urls: urls,
seed_compute: Mutex::new(SeedHashCompute::new()),
}
}
}
/// Convert an Ethash difficulty to the target boundary. Basically just `f(x) = 2^256 / x`.
fn difficulty_to_boundary(difficulty: &U256) -> H256 {
if *difficulty <= U256::one() {
U256::max_value().into()
} else {
(((U256::one() << 255) / *difficulty) << 1).into()
}
}
impl NotifyWork for WorkPoster {
fn notify(&self, pow_hash: H256, difficulty: U256, number: u64) {
// TODO: move this to engine
let target = difficulty_to_boundary(&difficulty);
let seed_hash = &self.seed_compute.lock().hash_block_number(number);
let seed_hash = H256::from_slice(&seed_hash[..]);
let body = format!(
r#"{{ "result": ["0x{:x}","0x{:x}","0x{:x}","0x{:x}"] }}"#,
pow_hash, seed_hash, target, number
);
for u in &self.urls {
let u = u.clone();
self.remote.spawn(self.client.fetch(
Request::new(u.clone(), Method::Post)
.with_header(ContentType::json())
.with_body(body.clone()), Default::default()
).map_err(move |e| {
warn!("Error sending HTTP notification to {} : {}, retrying", u, e);
}).map(|_| ()));
}
}
}