openethereum/util/src/misc.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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//! Diff misc.
use std::fs::File;
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use common::*;
use rlp::{Stream, RlpStream};
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use target_info::Target;
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use rustc_version;
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include!(concat!(env!("OUT_DIR"), "/version.rs"));
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#[derive(Debug,Clone,PartialEq,Eq)]
/// Diff type for specifying a change (or not).
pub enum Diff<T> where T: Eq {
/// Both sides are the same.
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Same,
/// Left (pre, source) side doesn't include value, right side (post, destination) does.
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Born(T),
/// Both sides include data; it chaged value between them.
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Changed(T, T),
/// Left (pre, source) side does include value, right side (post, destination) does not.
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Died(T),
}
impl<T> Diff<T> where T: Eq {
/// Construct new object with given `pre` and `post`.
pub fn new(pre: T, post: T) -> Self { if pre == post { Diff::Same } else { Diff::Changed(pre, post) } }
/// Get the before value, if there is one.
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pub fn pre(&self) -> Option<&T> { match *self { Diff::Died(ref x) | Diff::Changed(ref x, _) => Some(x), _ => None } }
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/// Get the after value, if there is one.
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pub fn post(&self) -> Option<&T> { match *self { Diff::Born(ref x) | Diff::Changed(_, ref x) => Some(x), _ => None } }
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/// Determine whether there was a change or not.
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pub fn is_same(&self) -> bool { match *self { Diff::Same => true, _ => false }}
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}
#[derive(PartialEq,Eq,Clone,Copy)]
/// Boolean type for clean/dirty status.
pub enum Filth {
/// Data has not been changed.
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Clean,
/// Data has been changed.
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Dirty,
}
/// Read the whole contents of a file `name`.
pub fn contents(name: &str) -> Result<Bytes, UtilError> {
let mut file = try!(File::open(name));
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let mut ret: Vec<u8> = Vec::new();
try!(file.read_to_end(&mut ret));
Ok(ret)
}
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/// Get the standard version string for this software.
pub fn version() -> String {
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format!("Parity/v{}-{}-{}/{}-{}-{}/rustc{}", env!("CARGO_PKG_VERSION"), short_sha(), commit_date().replace("-", ""), Target::arch(), Target::os(), Target::env(), rustc_version::version())
}
/// Get the standard version data for this software.
pub fn version_data() -> Bytes {
let mut s = RlpStream::new_list(4);
let v =
(u32::from_str(env!("CARGO_PKG_VERSION_MAJOR")).unwrap() << 16) +
(u32::from_str(env!("CARGO_PKG_VERSION_MINOR")).unwrap() << 8) +
u32::from_str(env!("CARGO_PKG_VERSION_PATCH")).unwrap();
s.append(&v);
s.append(&"Parity");
s.append(&format!("{}", rustc_version::version()));
s.append(&&Target::os()[0..2]);
s.out()
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}