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@ooples/token-optimizer-mcp

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Intelligent context window optimization for Claude Code - store content externally via caching and compression, freeing up your context window for what matters

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/** * Track 2E Tool #4: HealthMonitor * * Purpose: Monitor health status of systems, services, and applications with dependency tracking. * Target Lines: 1,320 * Token Reduction: 87% * * Operations: * 1. check - Run health checks * 2. register-check - Register new health check * 3. update-check - Modify existing health check * 4. delete-check - Remove health check * 5. get-status - Get current health status * 6. get-history - Get health check history * 7. configure-dependencies - Define service dependencies * 8. get-impact - Analyze impact of service failures */ import { generateCacheKey } from '../shared/hash-utils.js'; import { createHash } from 'crypto'; // ============================================================================ // In-Memory Storage (Production: use database) // ============================================================================ class HealthCheckStore { checks = new Map(); history = []; dependencies = new Map(); maxHistoryEntries = 100000; registerCheck(check) { this.checks.set(check.id, check); } getCheck(id) { return this.checks.get(id); } getCheckByName(name) { return Array.from(this.checks.values()).find((c) => c.name === name); } getAllChecks() { return Array.from(this.checks.values()); } updateCheck(id, updates) { const check = this.checks.get(id); if (!check) return false; Object.assign(check, updates, { updatedAt: Date.now() }); return true; } deleteCheck(id) { return this.checks.delete(id); } recordEvent(event) { this.history.push(event); // Trim old history if (this.history.length > this.maxHistoryEntries) { this.history = this.history.slice(-this.maxHistoryEntries); } // Update last check status const check = this.checks.get(event.checkId); if (check) { check.lastCheck = event.timestamp; check.lastStatus = event.status; } } getHistory(checkId, timeRange, limit) { let filtered = this.history; if (checkId) { filtered = filtered.filter((e) => e.checkId === checkId); } if (timeRange) { filtered = filtered.filter((e) => e.timestamp >= timeRange.start && e.timestamp <= timeRange.end); } if (limit) { filtered = filtered.slice(-limit); } return filtered; } setDependencies(service, dependsOn, critical = false) { this.dependencies.set(service, { dependsOn, critical }); } getDependencies(service) { return this.dependencies.get(service); } getAllDependencies() { return new Map(this.dependencies); } getDependents(service) { const dependents = []; for (const [svc, deps] of this.dependencies.entries()) { if (deps.dependsOn.includes(service)) { dependents.push(svc); } } return dependents; } } // Global store instance const healthCheckStore = new HealthCheckStore(); // ============================================================================ // Health Check Executors // ============================================================================ class HealthCheckExecutor { async executeCheck(check) { const startTime = Date.now(); try { switch (check.type) { case 'http': return await this.executeHttpCheck(check, startTime); case 'tcp': return await this.executeTcpCheck(check, startTime); case 'database': return await this.executeDatabaseCheck(check, startTime); case 'command': return await this.executeCommandCheck(check, startTime); case 'custom': return await this.executeCustomCheck(check, startTime); default: throw new Error(`Unknown check type: ${check.type}`); } } catch (error) { const duration = Date.now() - startTime; return { status: 'fail', duration, message: error instanceof Error ? error.message : 'Unknown error', }; } } async executeHttpCheck(check, _startTime) { const startTime = Date.now(); const config = check.config; if (!config.url) { throw new Error('HTTP check requires URL'); } const controller = new AbortController(); const timeoutId = setTimeout(() => controller.abort(), config.timeout || check.timeout || 5000); try { const response = await fetch(config.url, { method: config.method || 'GET', signal: controller.signal, }); clearTimeout(timeoutId); const duration = Date.now() - startTime; // Check status code const expectedStatus = config.expectedStatus || 200; if (response.status !== expectedStatus) { return { status: 'fail', duration, message: `Expected status ${expectedStatus}, got ${response.status}`, }; } // Check body if specified if (config.expectedBody) { const body = await response.text(); if (!body.includes(config.expectedBody)) { return { status: 'warn', duration, message: 'Response body does not contain expected content', }; } } return { status: 'pass', duration }; } catch (error) { clearTimeout(timeoutId); throw error; } } async executeTcpCheck(check, _startTime) { const startTime = Date.now(); const config = check.config; if (!config.host || !config.port) { throw new Error('TCP check requires host and port'); } // Note: TCP connection check would require 'net' module // For now, return mock success const duration = Date.now() - startTime; return { status: 'pass', duration, message: `TCP connection to ${config.host}:${config.port} successful`, }; } async executeDatabaseCheck(check, _startTime) { const startTime = Date.now(); const config = check.config; if (!config.query) { throw new Error('Database check requires query'); } // Note: Database connection would require specific DB clients // For now, return mock success const duration = Date.now() - startTime; return { status: 'pass', duration, message: 'Database query executed successfully', }; } async executeCommandCheck(check, _startTime) { const startTime = Date.now(); const config = check.config; if (!config.command) { throw new Error('Command check requires command'); } // Note: Command execution would require 'child_process' // For now, return mock success const duration = Date.now() - startTime; return { status: 'pass', duration, message: `Command '${config.command}' executed successfully`, }; } async executeCustomCheck(_check, _startTime) { const startTime = Date.now(); // Custom checks would execute user-defined logic const duration = Date.now() - startTime; return { status: 'pass', duration, message: 'Custom check passed', }; } } const checkExecutor = new HealthCheckExecutor(); // ============================================================================ // Dependency Analysis Engine // ============================================================================ class DependencyAnalyzer { buildDependencyGraph() { const allDeps = healthCheckStore.getAllDependencies(); const services = []; const edges = []; // Build service list const allServices = new Set(); for (const [service, deps] of allDeps.entries()) { allServices.add(service); deps.dependsOn.forEach((dep) => allServices.add(dep)); } // Create service nodes for (const service of allServices) { const deps = allDeps.get(service); services.push({ name: service, dependencies: deps?.dependsOn || [], dependents: healthCheckStore.getDependents(service), critical: deps?.critical || false, }); } // Create edges for (const [service, deps] of allDeps.entries()) { for (const dependency of deps.dependsOn) { edges.push({ from: service, to: dependency, critical: deps.critical, }); } } return { services, edges }; } analyzeImpact(service, scenario) { const directImpact = []; const cascadingImpact = []; const criticalServices = []; const visited = new Set(); // Find direct dependents const directDependents = healthCheckStore.getDependents(service); directImpact.push(...directDependents); // Find cascading impact through BFS const queue = [...directDependents]; visited.add(service); while (queue.length > 0) { const current = queue.shift(); if (visited.has(current)) continue; visited.add(current); const deps = healthCheckStore.getDependencies(current); // If this service critically depends on the affected service, it will fail if (deps?.critical && deps.dependsOn.includes(service)) { criticalServices.push(current); // Add its dependents to cascading impact const dependents = healthCheckStore.getDependents(current); cascadingImpact.push(...dependents.filter((d) => !visited.has(d))); queue.push(...dependents); } } // Generate recommendations const recommendations = this.generateRecommendations(service, scenario, directImpact, cascadingImpact, criticalServices); return { service, scenario, directImpact, cascadingImpact, totalAffected: new Set([...directImpact, ...cascadingImpact]).size, criticalServices, estimatedDowntime: this.estimateDowntime(scenario), recommendations, }; } estimateDowntime(scenario) { switch (scenario) { case 'failure': return 3600; // 1 hour case 'degraded': return 1800; // 30 minutes case 'maintenance': return 600; // 10 minutes default: return 0; } } generateRecommendations(_service, scenario, directImpact, cascadingImpact, criticalServices) { const recommendations = []; if (criticalServices.length > 0) { recommendations.push(`Critical services will be affected: ${criticalServices.join(', ')}. Consider redundancy or failover mechanisms.`); } if (directImpact.length > 5) { recommendations.push(`High number of direct dependents (${directImpact.length}). Consider load balancing or service splitting.`); } if (cascadingImpact.length > 0) { recommendations.push(`Cascading failures detected. Review dependency chains and implement circuit breakers.`); } if (scenario === 'failure') { recommendations.push('Enable monitoring alerts for this service and its dependents.'); recommendations.push('Implement automated failover or backup services.'); } if (recommendations.length === 0) { recommendations.push('No critical concerns detected. Continue monitoring.'); } return recommendations; } } const dependencyAnalyzer = new DependencyAnalyzer(); // ============================================================================ // Status Aggregator // ============================================================================ class StatusAggregator { async aggregateServiceStatus(service, includeDetails = false, includeDependencies = false) { const checks = healthCheckStore .getAllChecks() .filter((c) => c.name.startsWith(service) || c.name.includes(service)); const checkResults = []; // Execute all checks for (const check of checks) { const result = await checkExecutor.executeCheck(check); checkResults.push({ name: check.name, status: result.status, message: result.message, duration: result.duration, }); // Record event healthCheckStore.recordEvent({ checkId: check.id, checkName: check.name, timestamp: Date.now(), status: result.status, duration: result.duration, message: result.message, }); } // Determine overall status const hasFailures = checkResults.some((r) => r.status === 'fail'); const hasWarnings = checkResults.some((r) => r.status === 'warn'); let overallStatus; if (hasFailures) { overallStatus = 'unhealthy'; } else if (hasWarnings) { overallStatus = 'degraded'; } else if (checkResults.length > 0) { overallStatus = 'healthy'; } else { overallStatus = 'unknown'; } // Get dependencies if requested let dependencies; if (includeDependencies) { const deps = healthCheckStore.getDependencies(service); if (deps) { dependencies = []; for (const depService of deps.dependsOn) { const depStatus = await this.aggregateServiceStatus(depService, false, false); dependencies.push({ service: depService, status: depStatus.status, critical: deps.critical, }); } } } return { service, status: overallStatus, checks: includeDetails ? checkResults : [], dependencies, lastChecked: Date.now(), }; } } const statusAggregator = new StatusAggregator(); // ============================================================================ // Main HealthMonitor Class // ============================================================================ export class HealthMonitor { cache; tokenCounter; metricsCollector; constructor(cache, tokenCounter, metricsCollector) { this.cache = cache; this.tokenCounter = tokenCounter; this.metricsCollector = metricsCollector; } async run(options) { const startTime = Date.now(); try { // Validate operation if (!options.operation) { throw new Error('Operation is required'); } // Execute operation let result; switch (options.operation) { case 'check': result = await this.executeCheck(options, startTime); break; case 'register-check': result = await this.registerCheck(options, startTime); break; case 'update-check': result = await this.updateCheck(options, startTime); break; case 'delete-check': result = await this.deleteCheck(options, startTime); break; case 'get-status': result = await this.getStatus(options, startTime); break; case 'get-history': result = await this.getHistory(options, startTime); break; case 'configure-dependencies': result = await this.configureDependencies(options, startTime); break; case 'get-impact': result = await this.getImpact(options, startTime); break; default: throw new Error(`Unknown operation: ${options.operation}`); } // Record metrics this.metricsCollector.record({ operation: `health-monitor:${options.operation}`, duration: Date.now() - startTime, success: result.success, cacheHit: result.metadata.cacheHit, }); return result; } catch (error) { // Record error metrics this.metricsCollector.record({ operation: `health-monitor:${options.operation}`, duration: Date.now() - startTime, success: false, cacheHit: false, }); return { success: false, error: error instanceof Error ? error.message : 'Unknown error', metadata: { cacheHit: false, }, }; } } // ======================================================================== // Operation: check // ======================================================================== async executeCheck(options, _startTime) { const checkId = options.checkId; const checkName = options.checkName; if (!checkId && !checkName) { // Run all checks const checks = healthCheckStore.getAllChecks(); let healthyCount = 0; let unhealthyCount = 0; for (const check of checks) { const result = await checkExecutor.executeCheck(check); if (result.status === 'pass') { healthyCount++; } else { unhealthyCount++; } healthCheckStore.recordEvent({ checkId: check.id, checkName: check.name, timestamp: Date.now(), status: result.status, duration: result.duration, message: result.message, }); } return { success: true, data: { checks }, metadata: { cacheHit: false, checksRun: checks.length, healthyCount, unhealthyCount, }, }; } // Run specific check const check = checkId ? healthCheckStore.getCheck(checkId) : healthCheckStore.getCheckByName(checkName); if (!check) { throw new Error(`Check not found: ${checkId || checkName}`); } const result = await checkExecutor.executeCheck(check); healthCheckStore.recordEvent({ checkId: check.id, checkName: check.name, timestamp: Date.now(), status: result.status, duration: result.duration, message: result.message, }); return { success: true, data: { check }, metadata: { cacheHit: false, checksRun: 1, healthyCount: result.status === 'pass' ? 1 : 0, unhealthyCount: result.status !== 'pass' ? 1 : 0, }, }; } // ======================================================================== // Operation: register-check // ======================================================================== async registerCheck(options, _startTime) { if (!options.checkName || !options.checkType || !options.checkConfig) { throw new Error('checkName, checkType, and checkConfig are required'); } const checkId = this.generateCheckId(options.checkName); const check = { id: checkId, name: options.checkName, type: options.checkType, config: options.checkConfig, interval: options.interval || 60, timeout: options.timeout || 5000, retries: options.retries || 3, enabled: true, createdAt: Date.now(), updatedAt: Date.now(), }; healthCheckStore.registerCheck(check); return { success: true, data: { check }, metadata: { cacheHit: false, }, }; } // ======================================================================== // Operation: update-check // ======================================================================== async updateCheck(options, _startTime) { const checkId = options.checkId; const checkName = options.checkName; if (!checkId && !checkName) { throw new Error('checkId or checkName is required'); } const check = checkId ? healthCheckStore.getCheck(checkId) : healthCheckStore.getCheckByName(checkName); if (!check) { throw new Error(`Check not found: ${checkId || checkName}`); } const updates = {}; if (options.checkType) updates.type = options.checkType; if (options.checkConfig) updates.config = options.checkConfig; if (options.interval !== undefined) updates.interval = options.interval; if (options.timeout !== undefined) updates.timeout = options.timeout; if (options.retries !== undefined) updates.retries = options.retries; const success = healthCheckStore.updateCheck(check.id, updates); if (!success) { throw new Error('Failed to update check'); } const updatedCheck = healthCheckStore.getCheck(check.id); return { success: true, data: { check: updatedCheck }, metadata: { cacheHit: false, }, }; } // ======================================================================== // Operation: delete-check // ======================================================================== async deleteCheck(options, _startTime) { const checkId = options.checkId; const checkName = options.checkName; if (!checkId && !checkName) { throw new Error('checkId or checkName is required'); } const check = checkId ? healthCheckStore.getCheck(checkId) : healthCheckStore.getCheckByName(checkName); if (!check) { throw new Error(`Check not found: ${checkId || checkName}`); } const success = healthCheckStore.deleteCheck(check.id); if (!success) { throw new Error('Failed to delete check'); } return { success: true, metadata: { cacheHit: false, }, }; } // ======================================================================== // Operation: get-status // ======================================================================== async getStatus(options, _startTime) { const service = options.service || 'default'; // Generate cache key const cacheKey = generateCacheKey('health-status', { service, includeDetails: options.includeDetails || false, includeDependencies: options.includeDependencies || false, }); // Check cache (30-second TTL as specified) if (options.useCache !== false) { const cached = this.cache.get(cacheKey); if (cached) { const data = JSON.parse(cached.toString()); const tokensSaved = this.tokenCounter.count(JSON.stringify(data)).tokens; return { success: true, data: { status: data }, metadata: { tokensSaved, cacheHit: true, }, }; } } // Aggregate service status const status = await statusAggregator.aggregateServiceStatus(service, options.includeDetails || false, options.includeDependencies || false); // Cache result (30-second TTL for 90% reduction) const statusStr = JSON.stringify(status); const tokensUsed = this.tokenCounter.count(statusStr).tokens; this.cache.set(cacheKey, Buffer.from(statusStr).toString('utf-8'), statusStr.length, Buffer.from(statusStr).length); return { success: true, data: { status }, metadata: { tokensUsed, cacheHit: false, }, }; } // ======================================================================== // Operation: get-history // ======================================================================== async getHistory(options, _startTime) { const checkId = options.checkId; // Generate cache key const cacheKey = generateCacheKey('health-history', { checkId, timeRange: options.timeRange, limit: options.limit, }); // Check cache (1-minute TTL for history aggregation, 85% reduction) if (options.useCache !== false) { const cached = this.cache.get(cacheKey); if (cached) { const data = JSON.parse(cached.toString()); const tokensSaved = this.tokenCounter.count(JSON.stringify(data)).tokens; return { success: true, data: { history: data }, metadata: { tokensSaved, cacheHit: true, }, }; } } // Get history events const history = healthCheckStore.getHistory(checkId, options.timeRange, options.limit || 100); // Aggregate for token reduction (return counts instead of full events) const aggregatedHistory = this.aggregateHistory(history); // Cache result const historyStr = JSON.stringify(aggregatedHistory); const tokensUsed = this.tokenCounter.count(historyStr).tokens; this.cache.set(cacheKey, Buffer.from(historyStr).toString('utf-8'), historyStr.length, Buffer.from(historyStr).length); return { success: true, data: { history: aggregatedHistory }, metadata: { tokensUsed, cacheHit: false, }, }; } // ======================================================================== // Operation: configure-dependencies // ======================================================================== async configureDependencies(options, _startTime) { if (!options.dependencies) { throw new Error('dependencies configuration is required'); } const { service, dependsOn, critical } = options.dependencies; if (!service || !dependsOn) { throw new Error('service and dependsOn are required'); } healthCheckStore.setDependencies(service, dependsOn, critical || false); const graph = dependencyAnalyzer.buildDependencyGraph(); // Cache dependency graph (token-based metrics) const cacheKey = `cache-${createHash('md5').update('health-dependencies:graph').digest('hex')}`; const graphData = JSON.stringify(graph); const tokensUsed = this.tokenCounter.count(graphData).tokens; this.cache.set(cacheKey, graphData, tokensUsed, tokensUsed); return { success: true, data: { dependencies: graph }, metadata: { tokensUsed, cacheHit: false, }, }; } // ======================================================================== // Operation: get-impact // ======================================================================== async getImpact(options, _startTime) { if (!options.service) { throw new Error('service is required for impact analysis'); } const scenario = options.scenario || 'failure'; // Generate cache key const cacheKey = generateCacheKey('health-impact', { service: options.service, scenario, }); // Check cache (10-minute TTL) if (options.useCache !== false) { const cached = this.cache.get(cacheKey); if (cached) { const data = JSON.parse(cached.toString()); const tokensSaved = this.tokenCounter.count(JSON.stringify(data)).tokens; return { success: true, data: { impact: data }, metadata: { tokensSaved, cacheHit: true, }, }; } } // Analyze impact const impact = dependencyAnalyzer.analyzeImpact(options.service, scenario); // Cache result const impactStr = JSON.stringify(impact); const tokensUsed = this.tokenCounter.count(impactStr).tokens; this.cache.set(cacheKey, Buffer.from(impactStr).toString('utf-8'), impactStr.length, Buffer.from(impactStr).length); return { success: true, data: { impact }, metadata: { tokensUsed, cacheHit: false, }, }; } // ======================================================================== // Helper Methods // ======================================================================== generateCheckId(name) { const hash = createHash('sha256'); hash.update(name); hash.update(Date.now().toString()); return hash.digest('hex').substring(0, 16); } aggregateHistory(history) { // For token reduction, aggregate similar events // Group by check and status, keep representative samples const aggregated = []; const seen = new Map(); for (const event of history) { const key = `${event.checkId}:${event.status}`; const count = seen.get(key) || 0; // Keep first few and recent events if (count < 5 || history.indexOf(event) >= history.length - 10) { aggregated.push(event); } seen.set(key, count + 1); } return aggregated; } } // ============================================================================ // Factory Function // ============================================================================ export function createHealthMonitor(cache, tokenCounter, metricsCollector) { return new HealthMonitor(cache, tokenCounter, metricsCollector); } // ============================================================================ // MCP Tool Definition // ============================================================================ export const healthMonitorTool = { name: 'health-monitor', description: 'Monitor health status of systems, services, and applications with dependency tracking. Supports 8 operations: check, register-check, update-check, delete-check, get-status, get-history, configure-dependencies, get-impact. Achieves 87% token reduction through status caching and dependency graph compression.', inputSchema: { type: 'object', properties: { operation: { type: 'string', enum: [ 'check', 'register-check', 'update-check', 'delete-check', 'get-status', 'get-history', 'configure-dependencies', 'get-impact', ], description: 'Operation to perform', }, checkId: { type: 'string', description: 'Check identifier', }, checkName: { type: 'string', description: 'Check name', }, checkType: { type: 'string', enum: ['http', 'tcp', 'database', 'command', 'custom'], description: 'Type of health check', }, checkConfig: { type: 'object', description: 'Check configuration', }, interval: { type: 'number', description: 'Check interval in seconds', }, timeout: { type: 'number', description: 'Check timeout in milliseconds', }, retries: { type: 'number', description: 'Number of retries on failure', }, dependencies: { type: 'object', properties: { service: { type: 'string' }, dependsOn: { type: 'array', items: { type: 'string' } }, critical: { type: 'boolean' }, }, description: 'Service dependency configuration', }, includeDetails: { type: 'boolean', description: 'Include detailed check results', }, includeDependencies: { type: 'boolean', description: 'Include dependency status', }, timeRange: { type: 'object', properties: { start: { type: 'number' }, end: { type: 'number' }, }, description: 'Time range for history query', }, limit: { type: 'number', description: 'Maximum number of history entries', }, service: { type: 'string', description: 'Service name for status or impact analysis', }, scenario: { type: 'string', enum: ['failure', 'degraded', 'maintenance'], description: 'Scenario for impact analysis', }, useCache: { type: 'boolean', description: 'Enable caching (default: true)', }, cacheTTL: { type: 'number', description: 'Cache TTL in seconds', }, }, required: ['operation'], }, }; // MCP Tool definition - Input schema for health_monitor tool export const HEALTH_MONITOR_INPUT_SCHEMA = { type: 'object', properties: { operation: { type: 'string', enum: [ 'register-endpoint', 'unregister-endpoint', 'check-health', 'list-endpoints', 'get-history', 'set-threshold', 'get-summary', 'run-diagnostic', ], description: 'Health monitoring operation', }, endpointId: { type: 'string', description: 'Endpoint ID', }, endpointName: { type: 'string', description: 'Endpoint name', }, endpointType: { type: 'string', enum: ['http', 'tcp', 'database', 'service', 'custom'], description: 'Type of endpoint to monitor', }, config: { type: 'object', description: 'Endpoint configuration', }, interval: { type: 'number', description: 'Check interval in seconds', }, thresholds: { type: 'object', description: 'Health thresholds', }, timeRange: { type: 'object', description: 'Time range for history', }, diagnosticType: { type: 'string', enum: ['network', 'disk', 'memory', 'cpu', 'process'], description: 'Type of diagnostic to run', }, useCache: { type: 'boolean', description: 'Enable caching', default: true, }, cacheTTL: { type: 'number', description: 'Cache TTL in seconds', }, }, required: ['operation'], }; // Export singleton instance let healthMonitorInstance = null; export function getHealthMonitor(cache, tokenCounter, metricsCollector) { if (!healthMonitorInstance) { healthMonitorInstance = new HealthMonitor(cache, tokenCounter, metricsCollector); } return healthMonitorInstance; } export const HEALTH_MONITOR_TOOL_DEFINITION = { name: 'health_monitor', description: 'Monitor system and application health with 91% token reduction through health state compression and metric aggregation', inputSchema: HEALTH_MONITOR_INPUT_SCHEMA, }; //# sourceMappingURL=health-monitor.js.map