64 lines
2.5 KiB
Rust
64 lines
2.5 KiB
Rust
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// Copyright 2015, 2016 Ethcore (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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use rustc_serialize::json::Json;
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use std::io::Read;
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use std::time::Duration;
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use hyper::client::{Handler, Request, Response, Client};
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use hyper::{Next, Encoder, Decoder};
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use hyper::net::HttpStream;
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use std::str::FromStr;
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#[derive(Debug)]
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pub struct PriceInfo {
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pub ethusd: f32,
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}
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pub struct SetPriceHandler<F: Fn(PriceInfo) + Sync + Send + 'static> {
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set_price: F,
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}
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impl<F: Fn(PriceInfo) + Sync + Send + 'static> Handler<HttpStream> for SetPriceHandler<F> {
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fn on_request(&mut self, _: &mut Request) -> Next { trace!(target: "miner", "price_info: on_request"); Next::read().timeout(Duration::from_secs(3)) }
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fn on_request_writable(&mut self, _: &mut Encoder<HttpStream>) -> Next { trace!(target: "miner", "price_info: on_request_writable"); Next::read().timeout(Duration::from_secs(3)) }
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fn on_response(&mut self, _: Response) -> Next { trace!(target: "miner", "price_info: on_response"); Next::read().timeout(Duration::from_secs(3)) }
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fn on_response_readable(&mut self, r: &mut Decoder<HttpStream>) -> Next {
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trace!(target: "miner", "price_info: on_response_readable!");
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let mut body = String::new();
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let _ = r.read_to_string(&mut body).ok()
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.and_then(|_| Json::from_str(&body).ok())
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.and_then(|json| json.find_path(&["result", "ethusd"])
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.and_then(|obj| match *obj {
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Json::String(ref s) => Some((self.set_price)(PriceInfo {
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ethusd: FromStr::from_str(s).unwrap()
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})),
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_ => None,
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}));
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Next::end()
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}
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}
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impl PriceInfo {
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pub fn get<F: Fn(PriceInfo) + Sync + Send + 'static>(set_price: F) -> Result<(), ()> {
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// TODO: Handle each error type properly
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trace!(target: "miner", "Starting price info request...");
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Client::new().map_err(|_| ()).and_then(|client| {
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client.request(FromStr::from_str("http://api.etherscan.io/api?module=stats&action=ethprice").unwrap(), SetPriceHandler { set_price: set_price }).map_err(|_| ())
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})
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}
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}
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