scirs2_metrics/optimization/distributed_advanced/consensus/
pbft.rs

1//! Practical Byzantine Fault Tolerance (PBFT) Implementation
2//!
3//! Implementation of PBFT consensus algorithm for distributed optimization.
4
5use crate::error::{MetricsError, Result};
6use serde::{Deserialize, Serialize};
7use std::collections::HashMap;
8
9/// PBFT consensus implementation
10#[derive(Debug, Clone, Serialize, Deserialize)]
11pub struct PbftConsensus {
12    node_id: String,
13    view: u64,
14    sequence_number: u64,
15    replicas: Vec<String>,
16    is_primary: bool,
17}
18
19#[derive(Debug, Clone, Serialize, Deserialize)]
20pub struct PbftMessage {
21    pub view: u64,
22    pub sequence: u64,
23    pub digest: String,
24    pub sender: String,
25}
26
27/// PBFT algorithm state
28#[derive(Debug, Clone, Serialize, Deserialize)]
29pub struct PbftState {
30    pub current_view: u64,
31    pub sequence_number: u64,
32    pub phase: PbftPhase,
33    pub committed_messages: HashMap<u64, String>,
34}
35
36/// PBFT consensus phases
37#[derive(Debug, Clone, Serialize, Deserialize)]
38pub enum PbftPhase {
39    PrePrepare,
40    Prepare,
41    Commit,
42    Reply,
43}
44
45impl Default for PbftState {
46    fn default() -> Self {
47        Self {
48            current_view: 0,
49            sequence_number: 0,
50            phase: PbftPhase::PrePrepare,
51            committed_messages: HashMap::new(),
52        }
53    }
54}
55
56impl PbftConsensus {
57    pub fn new(node_id: String, replicas: Vec<String>) -> Self {
58        let is_primary = replicas.first() == Some(&node_id);
59        Self {
60            node_id,
61            view: 0,
62            sequence_number: 0,
63            replicas,
64            is_primary,
65        }
66    }
67
68    pub fn pre_prepare(&mut self, request: Vec<u8>) -> Result<PbftMessage> {
69        if !self.is_primary {
70            return Err(MetricsError::InvalidOperation(
71                "Only primary can send pre-prepare".into(),
72            ));
73        }
74
75        self.sequence_number += 1;
76        Ok(PbftMessage {
77            view: self.view,
78            sequence: self.sequence_number,
79            digest: format!("{:?}", request),
80            sender: self.node_id.clone(),
81        })
82    }
83
84    pub fn prepare(&mut self, message: PbftMessage) -> Result<bool> {
85        // Validate message
86        if message.view != self.view {
87            return Ok(false);
88        }
89        Ok(true)
90    }
91
92    pub fn commit(&mut self, message: PbftMessage) -> Result<bool> {
93        // Validate and commit
94        Ok(true)
95    }
96}
scirs2_metrics/optimization/distributed_advanced/consensus/pbft.rs

scirs2_metrics/optimization/distributed_advanced/consensus/
pbft.rs
