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
32
33
34
35
36
37
38
39
40

// Copyright (c) The Diem Core Contributors
// SPDX-License-Identifier: Apache-2.0

// Copyright 2021 Conflux Foundation. All rights reserved.
// Conflux is free software and distributed under GNU General Public License.
// See http://www.gnu.org/licenses/

use crate::pos::consensus::liveness::proposer_election::ProposerElection;
use consensus_types::common::{Author, Round};

use std::collections::HashMap;

/// The round proposer maps a round to author
pub struct RoundProposer {
    // A pre-defined map specifying proposers per round
    proposers: HashMap<Round, Author>,
    // Default proposer to use if proposer for a round is unspecified.
    // We hardcode this to the first proposer
    default_proposer: Author,
}

impl RoundProposer {
    pub fn new(
        proposers: HashMap<Round, Author>, default_proposer: Author,
    ) -> Self {
        Self {
            proposers,
            default_proposer,
        }
    }
}

impl ProposerElection for RoundProposer {
    fn get_valid_proposer(&self, round: Round) -> Author {
        match self.proposers.get(&round) {
            None => self.default_proposer,
            Some(round_proposer) => *round_proposer,
        }
    }
}