scirs2_metrics/optimization/distributed_advanced/
fault_recovery.rs

1//! Advanced Fault Recovery Module
2//!
3//! Provides advanced fault recovery mechanisms for distributed optimization systems.
4
5use crate::error::{MetricsError, Result};
6use std::collections::HashMap;
7use std::time::{Duration, Instant};
8
9/// Advanced fault recovery system
10#[derive(Debug, Clone)]
11pub struct AdvancedFaultRecovery {
12    node_id: String,
13    recovery_strategies: HashMap<FaultType, RecoveryStrategy>,
14    failure_history: Vec<FailureRecord>,
15    circuit_breakers: HashMap<String, CircuitBreaker>,
16}
17
18#[derive(Debug, Clone, Hash, PartialEq, Eq)]
19pub enum FaultType {
20    NetworkPartition,
21    NodeFailure,
22    MessageLoss,
23    ConsensusFailure,
24    DataCorruption,
25}
26
27#[derive(Debug, Clone)]
28pub enum RecoveryStrategy {
29    Retry(u32),
30    Failover(String),
31    Rollback,
32    Quarantine,
33    RepairAndRestart,
34}
35
36#[derive(Debug, Clone)]
37pub struct FailureRecord {
38    fault_type: FaultType,
39    timestamp: Instant,
40    affected_nodes: Vec<String>,
41    recovery_action: RecoveryStrategy,
42    success: bool,
43}
44
45#[derive(Debug, Clone)]
46pub struct CircuitBreaker {
47    failure_count: u32,
48    failure_threshold: u32,
49    timeout: Duration,
50    last_failure: Option<Instant>,
51    state: CircuitState,
52}
53
54#[derive(Debug, Clone)]
55pub enum CircuitState {
56    Closed,
57    Open,
58    HalfOpen,
59}
60
61impl AdvancedFaultRecovery {
62    pub fn new(node_id: String) -> Self {
63        let mut recovery_strategies = HashMap::new();
64        recovery_strategies.insert(FaultType::NetworkPartition, RecoveryStrategy::Retry(3));
65        recovery_strategies.insert(
66            FaultType::NodeFailure,
67            RecoveryStrategy::Failover("backup".to_string()),
68        );
69        recovery_strategies.insert(FaultType::MessageLoss, RecoveryStrategy::Retry(5));
70        recovery_strategies.insert(FaultType::ConsensusFailure, RecoveryStrategy::Rollback);
71        recovery_strategies.insert(
72            FaultType::DataCorruption,
73            RecoveryStrategy::RepairAndRestart,
74        );
75
76        Self {
77            node_id,
78            recovery_strategies,
79            failure_history: Vec::new(),
80            circuit_breakers: HashMap::new(),
81        }
82    }
83
84    pub fn handle_fault(
85        &mut self,
86        fault_type: FaultType,
87        affected_nodes: Vec<String>,
88    ) -> Result<()> {
89        let strategy = self
90            .recovery_strategies
91            .get(&fault_type)
92            .ok_or_else(|| MetricsError::InvalidOperation("Unknown fault type".into()))?
93            .clone();
94
95        let success = self.execute_recovery(&fault_type, &strategy, &affected_nodes)?;
96
97        let record = FailureRecord {
98            fault_type,
99            timestamp: Instant::now(),
100            affected_nodes,
101            recovery_action: strategy,
102            success,
103        };
104
105        self.failure_history.push(record);
106        Ok(())
107    }
108
109    fn execute_recovery(
110        &mut self,
111        fault_type: &FaultType,
112        strategy: &RecoveryStrategy,
113        nodes: &[String],
114    ) -> Result<bool> {
115        match strategy {
116            RecoveryStrategy::Retry(attempts) => {
117                for _ in 0..*attempts {
118                    if self.attempt_recovery(fault_type, nodes)? {
119                        return Ok(true);
120                    }
121                }
122                Ok(false)
123            }
124            RecoveryStrategy::Failover(backup) => self.initiate_failover(backup, nodes),
125            RecoveryStrategy::Rollback => self.perform_rollback(nodes),
126            RecoveryStrategy::Quarantine => self.quarantine_nodes(nodes),
127            RecoveryStrategy::RepairAndRestart => self.repair_and_restart(nodes),
128        }
129    }
130
131    fn attempt_recovery(&self, _fault_type: &FaultType, _nodes: &[String]) -> Result<bool> {
132        // Simulate recovery attempt
133        Ok(true)
134    }
135
136    fn initiate_failover(&mut self, _backup: &str, _nodes: &[String]) -> Result<bool> {
137        // Implement failover logic
138        Ok(true)
139    }
140
141    fn perform_rollback(&mut self, _nodes: &[String]) -> Result<bool> {
142        // Implement rollback logic
143        Ok(true)
144    }
145
146    fn quarantine_nodes(&mut self, nodes: &[String]) -> Result<bool> {
147        for node in nodes {
148            let circuit_breaker = CircuitBreaker {
149                failure_count: 1,
150                failure_threshold: 5,
151                timeout: Duration::from_secs(60),
152                last_failure: Some(Instant::now()),
153                state: CircuitState::Open,
154            };
155            self.circuit_breakers.insert(node.clone(), circuit_breaker);
156        }
157        Ok(true)
158    }
159
160    fn repair_and_restart(&mut self, _nodes: &[String]) -> Result<bool> {
161        // Implement repair and restart logic
162        Ok(true)
163    }
164
165    pub fn get_failure_history(&self) -> &[FailureRecord] {
166        &self.failure_history
167    }
168
169    pub fn is_node_quarantined(&self, node_id: &str) -> bool {
170        if let Some(breaker) = self.circuit_breakers.get(node_id) {
171            matches!(breaker.state, CircuitState::Open)
172        } else {
173            false
174        }
175    }
176}
scirs2_metrics/optimization/distributed_advanced/fault_recovery.rs

scirs2_metrics/optimization/distributed_advanced/
fault_recovery.rs
