tender 0.1.1

A Raft-based election framework
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

use crate::ElectionType;
use std::error::Error;

/// Election persistent state.
#[derive(Clone)]
pub struct HardState<T: ElectionType> {
    /// Current term of election.
    pub current_term: u64,
    /// The id of the node voted for in `current_term`.
    pub voted_for: Option<T::NodeId>,
}

impl<T: ElectionType> Default for HardState<T> {
    #[inline]
    fn default() -> Self {
        HardState {
            current_term: 0,
            voted_for: None,
        }
    }
}

/// Storage interfaces used by election.
pub trait Storage<T: ElectionType> {
    type Err: Error;

    fn load_hard_state(&self) -> Result<HardState<T>, Self::Err>;
    fn save_hard_state(&self, hard_state: &HardState<T>) -> Result<(), Self::Err>;
    fn load_vote_factor(&self) -> Result<T::VoteFactor, Self::Err>;
    fn prepare_step_down(&self) {}
}