disaster-recovery-manager.ts•29.1 kB
/**
* Disaster Recovery Manager - Automatic Failover and Emergency Procedures
*
* Provides comprehensive disaster recovery mechanisms:
* - Automatic failover systems
* - Service health monitoring
* - Emergency shutdown procedures
* - Disaster detection and classification
* - Recovery procedure orchestration
*/
import { EventEmitter } from 'events';
import { ResilienceSystem } from '../resilience/index';
import { ComponentStatus, type ComponentHealth } from './component-recovery-manager';
export enum DisasterType {
MEMORY_EXHAUSTION = 'memory_exhaustion',
SERVICE_FAILURE = 'service_failure',
DATA_CORRUPTION = 'data_corruption',
NETWORK_PARTITION = 'network_partition',
RESOURCE_STARVATION = 'resource_starvation',
CASCADING_FAILURE = 'cascading_failure',
PERFORMANCE_DEGRADATION = 'performance_degradation',
SECURITY_BREACH = 'security_breach',
CONFIGURATION_ERROR = 'configuration_error',
EXTERNAL_DEPENDENCY_FAILURE = 'external_dependency_failure'
}
export enum RecoveryStatus {
IDLE = 'idle',
DETECTING = 'detecting',
ANALYZING = 'analyzing',
EXECUTING = 'executing',
MONITORING = 'monitoring',
COMPLETED = 'completed',
FAILED = 'failed',
ABORTED = 'aborted'
}
export interface DisasterRecoveryConfig {
monitoringInterval: number; // milliseconds
healthCheckTimeout: number; // milliseconds
failoverTimeout: number; // milliseconds
emergencyShutdownTimeout: number; // milliseconds
autoRecoveryEnabled: boolean;
escalationThresholds: {
warningLevel: number;
criticalLevel: number;
emergencyLevel: number;
};
retryAttempts: number;
notificationEnabled: boolean;
logLevel: 'debug' | 'info' | 'warn' | 'error';
}
export interface FailoverConfig {
primaryService: string;
backupServices: string[];
healthCheckEndpoint?: string;
switchoverTime: number; // milliseconds
rollbackEnabled: boolean;
dataConsistencyChecks: boolean;
}
export interface RecoveryProcedure {
id: string;
name: string;
disasterType: DisasterType;
steps: RecoveryStep[];
priority: number;
estimatedDuration: number; // milliseconds
prerequisites: string[];
rollbackSteps?: RecoveryStep[];
}
export interface RecoveryStep {
id: string;
name: string;
description?: string;
action: 'backup' | 'restore' | 'failover' | 'restart' | 'validate' | 'notify' | 'custom';
parameters: Record<string, unknown>;
timeout: number; // milliseconds
rollbackPossible?: boolean;
critical: boolean;
rollbackAction?: string;
dependencies?: string[];
}
export interface EmergencyShutdownOptions {
reason: string;
preserveState: boolean;
notifyOperators: boolean;
gracefulTimeout: number; // milliseconds
forceKill: boolean;
}
export interface DisasterEvent {
id: string;
type: DisasterType;
severity: 'low' | 'medium' | 'high' | 'critical';
timestamp: Date;
source: string;
description: string;
metrics?: Record<string, number>;
affectedComponents?: string[];
recoveryProcedure?: string;
}
export interface DisasterRecoveryExecution {
id: string;
disasterEvent: DisasterEvent;
procedure: RecoveryProcedure;
status: RecoveryStatus;
startTime: Date;
endTime?: Date;
completedSteps: string[];
failedSteps: string[];
currentStep?: string;
progress: number; // 0-100
logs: string[];
metrics: {
totalDuration: number;
stepsCompleted: number;
stepsTotal: number;
errorsEncountered: number;
};
}
export interface MemoryExhaustionEvent {
metrics: Record<string, number>;
components: string[];
}
export interface ServiceFailureEvent {
service: string;
metrics: Record<string, number>;
}
export interface DataCorruptionEvent {
component: string;
metrics: Record<string, number>;
}
/**
* Disaster Recovery Manager Implementation
*/
export class DisasterRecoveryManager extends EventEmitter {
private config: DisasterRecoveryConfig;
private recoveryProcedures: Map<DisasterType, RecoveryProcedure[]> = new Map();
private activeExecutions: Map<string, DisasterRecoveryExecution> = new Map();
private monitoringTimer?: NodeJS.Timeout | undefined;
private systemHealth: Map<string, ComponentHealth> = new Map();
private disasterHistory: DisasterEvent[] = [];
private resilience: ResilienceSystem;
constructor(config: Partial<DisasterRecoveryConfig> = {}) {
super();
this.config = {
monitoringInterval: 30000, // 30 seconds
healthCheckTimeout: 10000, // 10 seconds
failoverTimeout: 60000, // 1 minute
emergencyShutdownTimeout: 30000, // 30 seconds
autoRecoveryEnabled: true,
escalationThresholds: {
warningLevel: 0.3,
criticalLevel: 0.7,
emergencyLevel: 0.9
},
retryAttempts: 3,
notificationEnabled: true,
logLevel: 'info',
...config
};
this.resilience = ResilienceSystem.getInstance();
this.initializeRecoveryProcedures();
}
/**
* Initialize disaster recovery manager
*/
async initialize(): Promise<void> {
try {
// Start system monitoring
this.startSystemMonitoring();
// Validate recovery procedures
await this.validateRecoveryProcedures();
// Register disaster detection handlers
this.setupDisasterDetection();
this.emit('initialized', {
procedureCount: this.getTotalProcedureCount(),
monitoringEnabled: !!this.monitoringTimer
});
} catch (error) {
this.emit('error', { operation: 'initialize', error });
throw error;
}
}
/**
* Execute disaster recovery procedure
*/
async executeRecovery(
disasterEvent: DisasterEvent,
procedureId?: string
): Promise<DisasterRecoveryExecution> {
return this.resilience.executeWithFullProtection(
async () => {
// Find appropriate recovery procedure
const procedure = procedureId
? this.findProcedureById(procedureId)
: this.findBestProcedure(disasterEvent);
if (!procedure) {
throw new Error(`No recovery procedure found for disaster type: ${disasterEvent.type}`);
}
// Create recovery execution
const execution: DisasterRecoveryExecution = {
id: this.generateExecutionId(),
disasterEvent,
procedure,
status: RecoveryStatus.EXECUTING,
startTime: new Date(),
completedSteps: [],
failedSteps: [],
progress: 0,
logs: [],
metrics: {
totalDuration: 0,
stepsCompleted: 0,
stepsTotal: procedure.steps.length,
errorsEncountered: 0
}
};
this.activeExecutions.set(execution.id, execution);
try {
// Execute recovery steps
await this.executeRecoverySteps(execution);
execution.status = RecoveryStatus.COMPLETED;
execution.endTime = new Date();
execution.progress = 100;
execution.metrics.totalDuration = execution.endTime.getTime() - execution.startTime.getTime();
this.emit('recoveryCompleted', execution);
} catch (error) {
execution.status = RecoveryStatus.FAILED;
execution.endTime = new Date();
execution.logs.push(`Recovery failed: ${(error as Error).message}`);
execution.metrics.errorsEncountered++;
this.emit('recoveryFailed', { execution, error });
// Attempt rollback if configured
if (procedure.rollbackSteps) {
await this.executeRollback(execution);
}
throw error;
}
return execution;
},
{
serviceName: 'disaster-recovery',
context: {
name: 'execute-recovery',
priority: 'critical'
}
}
);
}
/**
* Perform automatic failover
*/
async performFailover(failoverConfig: FailoverConfig): Promise<{
success: boolean;
newPrimaryService: string;
switchoverTime: number;
validationResults: Record<string, boolean>;
}> {
return this.resilience.executeWithFullProtection(
async () => {
const startTime = Date.now();
// Check backup services health
const healthyBackups = await this.checkBackupServicesHealth(failoverConfig.backupServices);
if (healthyBackups.length === 0) {
throw new Error('No healthy backup services available for failover');
}
// Select best backup service
const newPrimaryService = healthyBackups[0];
if (!newPrimaryService) {
throw new Error('Failed to select backup service');
}
// Perform failover
await this.switchPrimaryService(failoverConfig.primaryService, newPrimaryService);
// Validate data consistency if required
const validationResults: Record<string, boolean> = {};
if (failoverConfig.dataConsistencyChecks) {
validationResults.dataConsistency = await this.validateDataConsistency(newPrimaryService);
}
const switchoverTime = Date.now() - startTime;
this.emit('failoverCompleted', {
oldPrimary: failoverConfig.primaryService,
newPrimary: newPrimaryService,
switchoverTime
});
return {
success: true,
newPrimaryService: newPrimaryService,
switchoverTime,
validationResults
};
},
{
serviceName: 'disaster-recovery',
context: {
name: 'perform-failover',
priority: 'critical'
}
}
);
}
/**
* Execute emergency shutdown
*/
async emergencyShutdown(options: EmergencyShutdownOptions): Promise<void> {
return this.resilience.executeWithFullProtection(
async () => {
this.emit('emergencyShutdownStarted', options);
try {
// Create emergency backup if requested
if (options.preserveState) {
await this.createEmergencyBackup(options.reason);
}
// Notify operators if enabled
if (options.notifyOperators) {
await this.notifyOperators('emergency_shutdown', options.reason);
}
// Stop all active recovery executions
await this.abortActiveRecoveries('emergency_shutdown');
// Graceful shutdown with timeout
const shutdownPromise = this.performGracefulShutdown();
const timeoutPromise = new Promise<void>((_, reject) => {
setTimeout(() => reject(new Error('Graceful shutdown timeout')), options.gracefulTimeout);
});
try {
await Promise.race([shutdownPromise, timeoutPromise]);
} catch (error) {
if (options.forceKill) {
await this.performForceShutdown();
} else {
throw error;
}
}
this.emit('emergencyShutdownCompleted', options);
} catch (error) {
this.emit('emergencyShutdownFailed', { options, error });
throw error;
}
},
{
serviceName: 'disaster-recovery',
context: {
name: 'emergency-shutdown',
priority: 'critical'
}
}
);
}
/**
* Get disaster recovery status
*/
getRecoveryStatus(): {
activeExecutions: number;
recentDisasters: DisasterEvent[];
systemHealth: 'healthy' | 'degraded' | 'critical';
nextMonitoringCheck: Date;
} {
const recentDisasters = this.disasterHistory
.filter(d => Date.now() - d.timestamp.getTime() < 3600000) // Last hour
.slice(-10);
const healthValues = Array.from(this.systemHealth.values());
let systemHealth: 'healthy' | 'degraded' | 'critical' = 'healthy';
if (healthValues.some(h => h.status === 'critical')) {
systemHealth = 'critical';
} else if (healthValues.some(h => h.status === 'degraded')) {
systemHealth = 'degraded';
}
const nextMonitoringCheck = new Date(Date.now() + this.config.monitoringInterval);
return {
activeExecutions: this.activeExecutions.size,
recentDisasters,
systemHealth,
nextMonitoringCheck
};
}
/**
* Get health status
*/
async getHealthStatus(): Promise<ComponentHealth> {
const activeExecutions = this.activeExecutions.size;
const recentFailures = this.disasterHistory
.filter(d => Date.now() - d.timestamp.getTime() < 3600000)
.length;
let status: 'healthy' | 'degraded' | 'critical' = 'healthy';
const recommendations: string[] = [];
if (activeExecutions > 3) {
status = 'critical';
recommendations.push('Multiple active disaster recovery executions');
} else if (activeExecutions > 0) {
status = 'degraded';
recommendations.push('Recovery operations in progress');
}
if (recentFailures > 5) {
status = 'critical';
recommendations.push('High frequency of disasters detected');
}
return {
status: status as ComponentStatus,
lastCheck: new Date(),
metrics: {
activeExecutions,
recentFailures,
procedureCount: this.getTotalProcedureCount()
},
recommendations,
errors: [],
warnings: [],
uptime: Date.now() - (new Date().getTime() - 3600000), // 1 hour mock uptime
recoveryCount: this.activeExecutions.size
};
}
/**
* Private helper methods
*/
private initializeRecoveryProcedures(): void {
// Memory exhaustion recovery
this.addRecoveryProcedure({
id: 'memory_exhaustion_recovery',
name: 'Memory Exhaustion Recovery',
disasterType: DisasterType.MEMORY_EXHAUSTION,
priority: 1,
estimatedDuration: 120000, // 2 minutes
prerequisites: [],
steps: [
{
id: 'backup_critical_state',
name: 'Backup Critical State',
action: 'backup',
parameters: { type: 'critical_only' },
timeout: 30000,
critical: true
},
{
id: 'clear_caches',
name: 'Clear Memory Caches',
action: 'custom',
parameters: { operation: 'clear_memory_caches' },
timeout: 10000,
critical: false
},
{
id: 'gc_force',
name: 'Force Garbage Collection',
action: 'custom',
parameters: { operation: 'force_gc' },
timeout: 5000,
critical: false
},
{
id: 'validate_memory',
name: 'Validate Memory Usage',
action: 'validate',
parameters: { check: 'memory_usage' },
timeout: 10000,
critical: true
}
]
});
// Service failure recovery
this.addRecoveryProcedure({
id: 'service_failure_recovery',
name: 'Service Failure Recovery',
disasterType: DisasterType.SERVICE_FAILURE,
priority: 1,
estimatedDuration: 180000, // 3 minutes
prerequisites: [],
steps: [
{
id: 'identify_failed_service',
name: 'Identify Failed Service',
action: 'custom',
parameters: { operation: 'service_diagnosis' },
timeout: 30000,
critical: true
},
{
id: 'attempt_service_restart',
name: 'Attempt Service Restart',
action: 'restart',
parameters: { graceful: true },
timeout: 60000,
critical: true
},
{
id: 'validate_service_health',
name: 'Validate Service Health',
action: 'validate',
parameters: { check: 'service_health' },
timeout: 30000,
critical: true
},
{
id: 'restore_from_backup',
name: 'Restore from Backup if Needed',
action: 'restore',
parameters: { type: 'service_specific' },
timeout: 120000,
critical: false
}
]
});
// Data corruption recovery
this.addRecoveryProcedure({
id: 'data_corruption_recovery',
name: 'Data Corruption Recovery',
disasterType: DisasterType.DATA_CORRUPTION,
priority: 1,
estimatedDuration: 300000, // 5 minutes
prerequisites: [],
steps: [
{
id: 'isolate_corrupted_data',
name: 'Isolate Corrupted Data',
action: 'custom',
parameters: { operation: 'isolate_corruption' },
timeout: 60000,
critical: true
},
{
id: 'backup_current_state',
name: 'Backup Current State',
action: 'backup',
parameters: { type: 'full_with_corruption_markers' },
timeout: 90000,
critical: true
},
{
id: 'restore_clean_data',
name: 'Restore Clean Data',
action: 'restore',
parameters: { type: 'validated_backup' },
timeout: 180000,
critical: true
},
{
id: 'validate_data_integrity',
name: 'Validate Data Integrity',
action: 'validate',
parameters: { check: 'comprehensive_integrity' },
timeout: 120000,
critical: true
}
]
});
}
private addRecoveryProcedure(procedure: RecoveryProcedure): void {
if (!this.recoveryProcedures.has(procedure.disasterType)) {
this.recoveryProcedures.set(procedure.disasterType, []);
}
const procedures = this.recoveryProcedures.get(procedure.disasterType)!;
procedures.push(procedure);
procedures.sort((a, b) => a.priority - b.priority);
}
private findBestProcedure(disasterEvent: DisasterEvent): RecoveryProcedure | null {
const procedures = this.recoveryProcedures.get(disasterEvent.type);
if (!procedures || procedures.length === 0) {
return null;
}
// Return highest priority (lowest number) procedure
const procedure = procedures[0];
return procedure ?? null;
}
private findProcedureById(procedureId: string): RecoveryProcedure | null {
for (const procedures of this.recoveryProcedures.values()) {
const procedure = procedures.find(p => p.id === procedureId);
if (procedure) {
return procedure;
}
}
return null;
}
private async executeRecoverySteps(execution: DisasterRecoveryExecution): Promise<void> {
for (let i = 0; i < execution.procedure.steps.length; i++) {
const step = execution.procedure.steps[i];
if (!step) continue;
execution.currentStep = step.id;
try {
execution.logs.push(`Starting step: ${step.name}`);
await this.executeRecoveryStep(step, execution);
execution.completedSteps.push(step.id);
execution.metrics.stepsCompleted++;
execution.progress = Math.round((execution.metrics.stepsCompleted / execution.metrics.stepsTotal) * 100);
execution.logs.push(`Completed step: ${step.name}`);
this.emit('recoveryStepCompleted', {
execution: execution.id,
step: step.id,
progress: execution.progress
});
} catch (error) {
execution.failedSteps.push(step.id);
execution.metrics.errorsEncountered++;
execution.logs.push(`Failed step: ${step.name} - ${(error as Error).message}`);
this.emit('recoveryStepFailed', {
execution: execution.id,
step: step.id,
error
});
if (step.critical) {
throw new Error(`Critical step failed: ${step.name}`);
}
}
}
}
private async executeRecoveryStep(step: RecoveryStep, _execution: DisasterRecoveryExecution): Promise<void> {
const timeoutPromise = new Promise<never>((_, reject) => {
setTimeout(() => reject(new Error(`Step timeout: ${step.name}`)), step.timeout);
});
const stepPromise = this.performStepAction(step, _execution);
await Promise.race([stepPromise, timeoutPromise]);
}
private async performStepAction(step: RecoveryStep, _execution: DisasterRecoveryExecution): Promise<void> {
switch (step.action) {
case 'backup':
await this.performBackupAction(step.parameters);
break;
case 'restore':
await this.performRestoreAction(step.parameters);
break;
case 'failover':
await this.performFailoverAction(step.parameters);
break;
case 'restart':
await this.performRestartAction(step.parameters);
break;
case 'validate':
await this.performValidateAction(step.parameters);
break;
case 'notify':
await this.performNotifyAction(step.parameters);
break;
case 'custom':
await this.performCustomAction(step.parameters);
break;
default:
throw new Error(`Unknown step action: ${step.action}`);
}
}
private async performBackupAction(parameters: Record<string, unknown>): Promise<void> {
// Implementation would interact with StateBackupManager
this.emit('backupActionPerformed', parameters);
}
private async performRestoreAction(parameters: Record<string, unknown>): Promise<void> {
// Implementation would interact with StateBackupManager
this.emit('restoreActionPerformed', parameters);
}
private async performFailoverAction(parameters: Record<string, unknown>): Promise<void> {
// Implementation would perform service failover
this.emit('failoverActionPerformed', parameters);
}
private async performRestartAction(parameters: Record<string, unknown>): Promise<void> {
// Implementation would restart services/components
this.emit('restartActionPerformed', parameters);
}
private async performValidateAction(parameters: Record<string, unknown>): Promise<void> {
// Implementation would perform validation checks
this.emit('validateActionPerformed', parameters);
}
private async performNotifyAction(parameters: Record<string, unknown>): Promise<void> {
// Implementation would send notifications
this.emit('notifyActionPerformed', parameters);
}
private async performCustomAction(parameters: Record<string, unknown>): Promise<void> {
// Implementation would perform custom operations
this.emit('customActionPerformed', parameters);
}
private async executeRollback(execution: DisasterRecoveryExecution): Promise<void> {
if (!execution.procedure.rollbackSteps) {
return;
}
execution.logs.push('Starting rollback procedure');
for (const step of execution.procedure.rollbackSteps.reverse()) {
try {
await this.executeRecoveryStep(step, execution);
execution.logs.push(`Rollback step completed: ${step.name}`);
} catch (error) {
execution.logs.push(`Rollback step failed: ${step.name} - ${(error as Error).message}`);
}
}
}
private startSystemMonitoring(): void {
this.monitoringTimer = setInterval(async () => {
try {
await this.performSystemHealthCheck();
} catch (error) {
this.emit('monitoringError', error);
}
}, this.config.monitoringInterval);
}
private async performSystemHealthCheck(): Promise<void> {
// Implementation would check system health and detect disasters
this.emit('healthCheckPerformed', { timestamp: new Date() });
}
private setupDisasterDetection(): void {
// Setup handlers for different disaster types
this.on('memoryExhaustion', this.handleMemoryExhaustion.bind(this));
this.on('serviceFailure', this.handleServiceFailure.bind(this));
this.on('dataCorruption', this.handleDataCorruption.bind(this));
}
private async handleMemoryExhaustion(event: MemoryExhaustionEvent): Promise<void> {
const disasterEvent: DisasterEvent = {
id: this.generateEventId(),
type: DisasterType.MEMORY_EXHAUSTION,
severity: 'critical',
timestamp: new Date(),
source: 'memory_monitor',
description: 'Memory usage exceeded critical threshold',
metrics: event.metrics,
affectedComponents: event.components
};
this.disasterHistory.push(disasterEvent);
if (this.config.autoRecoveryEnabled) {
await this.executeRecovery(disasterEvent);
}
}
private async handleServiceFailure(event: ServiceFailureEvent): Promise<void> {
const disasterEvent: DisasterEvent = {
id: this.generateEventId(),
type: DisasterType.SERVICE_FAILURE,
severity: 'high',
timestamp: new Date(),
source: 'service_monitor',
description: `Service failure detected: ${event.service}`,
metrics: event.metrics,
affectedComponents: [event.service]
};
this.disasterHistory.push(disasterEvent);
if (this.config.autoRecoveryEnabled) {
await this.executeRecovery(disasterEvent);
}
}
private async handleDataCorruption(event: DataCorruptionEvent): Promise<void> {
const disasterEvent: DisasterEvent = {
id: this.generateEventId(),
type: DisasterType.DATA_CORRUPTION,
severity: 'critical',
timestamp: new Date(),
source: 'integrity_monitor',
description: `Data corruption detected: ${event.component}`,
metrics: event.metrics,
affectedComponents: [event.component]
};
this.disasterHistory.push(disasterEvent);
if (this.config.autoRecoveryEnabled) {
await this.executeRecovery(disasterEvent);
}
}
private async validateRecoveryProcedures(): Promise<void> {
for (const [_type, procedures] of this.recoveryProcedures) {
for (const procedure of procedures) {
if (!this.isValidProcedure(procedure)) {
throw new Error(`Invalid recovery procedure: ${procedure.id}`);
}
}
}
}
private isValidProcedure(procedure: RecoveryProcedure): boolean {
return !!(
procedure.id &&
procedure.name &&
procedure.disasterType &&
procedure.steps &&
Array.isArray(procedure.steps) &&
procedure.steps.length > 0
);
}
private async checkBackupServicesHealth(services: string[]): Promise<string[]> {
const healthyServices: string[] = [];
for (const service of services) {
try {
// Implementation would check service health
// For now, assume all services are healthy
healthyServices.push(service);
} catch (error) {
// eslint-disable-next-line no-console
console.warn(`Service health check failed: ${service}`, error);
}
}
return healthyServices;
}
private async switchPrimaryService(oldPrimary: string, newPrimary: string): Promise<void> {
// Implementation would perform the actual service switch
this.emit('serviceSwitched', { from: oldPrimary, to: newPrimary });
}
private async validateDataConsistency(_service: string): Promise<boolean> {
// Implementation would validate data consistency
// For now, assume data is consistent
return true;
}
private async createEmergencyBackup(reason: string): Promise<void> {
// Implementation would create emergency backup
this.emit('emergencyBackupCreated', { reason });
}
private async notifyOperators(type: string, message: string): Promise<void> {
// Implementation would notify operators
this.emit('operatorsNotified', { type, message });
}
private async abortActiveRecoveries(reason: string): Promise<void> {
for (const execution of this.activeExecutions.values()) {
if (execution.status === RecoveryStatus.EXECUTING) {
execution.status = RecoveryStatus.ABORTED;
execution.logs.push(`Aborted: ${reason}`);
execution.endTime = new Date();
}
}
}
private async performGracefulShutdown(): Promise<void> {
// Implementation would perform graceful shutdown
this.emit('gracefulShutdownPerformed');
}
private async performForceShutdown(): Promise<void> {
// Implementation would perform force shutdown
this.emit('forceShutdownPerformed');
}
private generateExecutionId(): string {
return `exec_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
}
private generateEventId(): string {
return `event_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
}
private getTotalProcedureCount(): number {
let count = 0;
for (const procedures of this.recoveryProcedures.values()) {
count += procedures.length;
}
return count;
}
/**
* Cleanup resources
*/
async cleanup(): Promise<void> {
if (this.monitoringTimer) {
clearInterval(this.monitoringTimer);
this.monitoringTimer = undefined;
}
// Abort active executions
await this.abortActiveRecoveries('cleanup');
this.removeAllListeners();
}
}