146 lines
3.6 KiB
Rust
146 lines
3.6 KiB
Rust
// 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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//! Universaly unique identifier.
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use std::str::FromStr;
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use std::fmt;
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use rustc_serialize::hex::{ToHex, FromHex};
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use serde::{Deserialize, Serialize, Deserializer, Serializer, Error as SerdeError};
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use serde::de::Visitor;
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use super::Error;
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/// Universaly unique identifier.
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#[derive(Debug, PartialEq)]
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pub struct UUID([u8; 16]);
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impl From<[u8; 16]> for UUID {
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fn from(uuid: [u8; 16]) -> Self {
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UUID(uuid)
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}
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}
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impl<'a> Into<String> for &'a UUID {
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fn into(self) -> String {
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let d1 = &self.0[0..4];
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let d2 = &self.0[4..6];
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let d3 = &self.0[6..8];
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let d4 = &self.0[8..10];
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let d5 = &self.0[10..16];
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[d1, d2, d3, d4, d5].into_iter().map(|d| d.to_hex()).collect::<Vec<String>>().join("-")
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}
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}
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impl Into<String> for UUID {
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fn into(self) -> String {
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Into::into(&self)
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}
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}
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impl Into<[u8; 16]> for UUID {
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fn into(self) -> [u8; 16] {
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self.0
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}
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}
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impl fmt::Display for UUID {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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let s: String = (self as &UUID).into();
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write!(f, "{}", s)
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}
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}
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fn copy_into(from: &str, into: &mut [u8]) -> Result<(), Error> {
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let from = try!(from.from_hex().map_err(|_| Error::InvalidUUID));
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if from.len() != into.len() {
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return Err(Error::InvalidUUID);
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}
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into.copy_from_slice(&from);
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Ok(())
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}
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impl FromStr for UUID {
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type Err = Error;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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let parts: Vec<&str> = s.split("-").collect();
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if parts.len() != 5 {
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return Err(Error::InvalidUUID);
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}
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let mut uuid = [0u8; 16];
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try!(copy_into(parts[0], &mut uuid[0..4]));
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try!(copy_into(parts[1], &mut uuid[4..6]));
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try!(copy_into(parts[2], &mut uuid[6..8]));
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try!(copy_into(parts[3], &mut uuid[8..10]));
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try!(copy_into(parts[4], &mut uuid[10..16]));
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Ok(UUID(uuid))
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}
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}
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impl Serialize for UUID {
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fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
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where S: Serializer {
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let s: String = self.into();
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serializer.serialize_str(&s)
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}
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}
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impl Deserialize for UUID {
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fn deserialize<D>(deserializer: &mut D) -> Result<Self, D::Error>
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where D: Deserializer {
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deserializer.deserialize(UUIDVisitor)
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}
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}
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struct UUIDVisitor;
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impl Visitor for UUIDVisitor {
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type Value = UUID;
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fn visit_str<E>(&mut self, value: &str) -> Result<Self::Value, E> where E: SerdeError {
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UUID::from_str(value).map_err(SerdeError::custom)
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}
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fn visit_string<E>(&mut self, value: String) -> Result<Self::Value, E> where E: SerdeError {
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self.visit_str(value.as_ref())
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}
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}
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#[cfg(test)]
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mod tests {
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use std::str::FromStr;
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use super::UUID;
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#[test]
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fn uuid_from_str() {
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let uuid = UUID::from_str("3198bc9c-6672-5ab3-d995-4942343ae5b6").unwrap();
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assert_eq!(uuid, UUID::from([0x31, 0x98, 0xbc, 0x9c, 0x66, 0x72, 0x5a, 0xb3, 0xd9, 0x95, 0x49, 0x42, 0x34, 0x3a, 0xe5, 0xb6]));
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}
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#[test]
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fn uuid_from_and_to_str() {
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let from = "3198bc9c-6672-5ab3-d995-4942343ae5b6";
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let uuid = UUID::from_str(from).unwrap();
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let to: String = uuid.into();
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assert_eq!(from, &to);
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}
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}
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