openethereum/parity/price_info.rs

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// Copyright 2015, 2016 Ethcore (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/>.
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use rustc_serialize::json::Json;
use std::io::Read;
use hyper::Client;
use hyper::header::Connection;
use std::str::FromStr;
pub struct PriceInfo {
pub ethusd: f32,
}
impl PriceInfo {
pub fn get() -> Option<PriceInfo> {
let mut body = String::new();
// TODO: Handle each error type properly
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let mut client = Client::new();
client.set_read_timeout(Some(::std::time::Duration::from_secs(3)));
client.get("http://api.etherscan.io/api?module=stats&action=ethprice")
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.header(Connection::close())
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.send()
.ok()
.and_then(|mut s| s.read_to_string(&mut body).ok())
.and_then(|_| Json::from_str(&body).ok())
.and_then(|json| json.find_path(&["result", "ethusd"])
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.and_then(|obj| match *obj {
Json::String(ref s) => Some(PriceInfo {
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ethusd: FromStr::from_str(s).unwrap()
}),
_ => None
}))
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}
}