scirs2-metrics 0.3.2

//! Raft Consensus Algorithm Implementation
//!
//! Implementation of the Raft consensus algorithm for distributed optimization coordination.

use crate::error::{MetricsError, Result};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::{Duration, Instant};

/// Raft consensus implementation
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RaftConsensus {
    node_id: String,
    current_term: u64,
    voted_for: Option<String>,
    log: Vec<LogEntry>,
    state: RaftState,
    peers: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum RaftState {
    Follower,
    Candidate,
    Leader,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LogEntry {
    term: u64,
    index: u64,
    data: Vec<u8>,
}

impl RaftConsensus {
    pub fn new(node_id: String, peers: Vec<String>) -> Self {
        Self {
            node_id,
            current_term: 0,
            voted_for: None,
            log: Vec::new(),
            state: RaftState::Follower,
            peers,
        }
    }

    pub fn start_election(&mut self) -> Result<()> {
        self.current_term += 1;
        self.state = RaftState::Candidate;
        self.voted_for = Some(self.node_id.clone());
        Ok(())
    }

    pub fn append_entries(&mut self, entries: Vec<LogEntry>) -> Result<bool> {
        self.log.extend(entries);
        Ok(true)
    }

    pub fn request_vote(&mut self, candidate_id: String, term: u64) -> Result<bool> {
        if term > self.current_term {
            self.current_term = term;
            self.voted_for = Some(candidate_id);
            Ok(true)
        } else {
            Ok(false)
        }
    }
}