libblockchain/
chain.rs

1// The MIT License (MIT)
2//
3// Copyright (c) 2017 Doublify Technologies
4//
5// Permission is hereby granted, free of charge, to any person obtaining a copy
6// of this software and associated documentation files (the "Software"), to deal
7// in the Software without restriction, including without limitation the rights
8// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9// copies of the Software, and to permit persons to whom the Software is
10// furnished to do so, subject to the following conditions:
11//
12// The above copyright notice and this permission notice shall be included in
13// all copies or substantial portions of the Software.
14//
15// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21// THE SOFTWARE.
22
23//! A `Chain` implementation.
24
25use std::hash::Hash;
26
27use block::Block;
28
29/// A `Chain` representation.
30#[derive(Debug)]
31pub struct Chain<T: Clone + Hash> {
32    inner: Vec<Block<T>>,
33}
34
35impl<T: Clone + Hash> Chain<T> {
36    /// Creates a new `Chain`.
37    pub fn new(inner: Vec<Block<T>>) -> Chain<T> {
38        Chain { inner }
39    }
40
41    /// Appends a block to the `Chain`.
42    ///
43    /// [`None`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.None
44    ///
45    /// # Examples
46    ///
47    /// ```rust
48    /// use libblockchain::{Block, Chain};
49    ///
50    /// let mut chain = Chain::new(vec![]);
51    ///
52    /// let block0 = Block::new(0, vec![0; 256], 0);
53    ///
54    /// let resp = chain.push(block0);
55    ///
56    /// assert_eq!(resp.is_some(), true)
57    /// ```
58    pub fn push(&mut self, v: Block<T>) -> Option<()> {
59        Some(self.inner.push(v))
60    }
61
62    /// Returns `true` if the given `Chain` is trusty.
63    pub fn is_trusty_chain(&self) -> bool {
64        let mut iter = self.inner.clone().into_iter();
65
66        while let Some(previous) = iter.next() {
67            if let Some(current) = iter.next() {
68                if !current.is_trusty_for(&previous) {
69                    return false;
70                }
71            }
72        }
73
74        true
75    }
76}
libblockchain/chain.rs

libblockchain/
chain.rs
