faction 0.3.3

A no_std + alloc, protocol-independent cluster readiness state machine for startup coordination and readiness quorum tracking.
Documentation 
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// Copyright 2025 Umberto Gotti <umberto.gotti@umbertogotti.dev>
// Licensed under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0

use alloc::vec;
use alloc::vec::Vec;

use crate::conclusion::Conclusion;
use crate::outcome::Outcome;
use crate::PeerId;

pub struct ReadyStep {
    outcomes: Vec<Outcome>,
    confirmed_peers: Vec<PeerId>,
    is_quorum: bool,
}

impl ReadyStep {
    #[must_use]
    pub fn new(confirmed_peers: Vec<PeerId>, peer_id: PeerId, quorum_threshold: usize) -> Self {
        let is_dup = confirmed_peers.contains(&peer_id);
        let confirmed_new = !is_dup;

        let mut new_confirmed_peers = confirmed_peers;
        if confirmed_new {
            new_confirmed_peers.push(peer_id);
        }

        let is_quorum = confirmed_new && new_confirmed_peers.len() >= quorum_threshold;

        let outcome = if is_dup {
            Outcome::DuplicateReadyIgnored { peer_id }
        } else {
            Outcome::ReadyAccepted { peer_id }
        };

        let mut outcomes = vec![outcome];
        if is_quorum {
            outcomes.push(Outcome::Concluded {
                mode: Conclusion::Bootstrapped,
            });
        }

        Self {
            outcomes,
            confirmed_peers: new_confirmed_peers,
            is_quorum,
        }
    }

    #[must_use]
    pub fn confirmed_peers(&self) -> &[PeerId] {
        &self.confirmed_peers
    }

    #[must_use]
    pub fn is_quorum(&self) -> bool {
        self.is_quorum
    }

    #[must_use]
    pub fn outcomes(&self) -> &[Outcome] {
        &self.outcomes
    }
}