Copilot Studio Agent Direct Line MCP Server

/** * Health check service for monitoring application health */ /** * Health status */ export type HealthStatus = 'healthy' | 'degraded' | 'unhealthy'; /** * Dependency health check result */ export interface DependencyHealth { name: string; status: HealthStatus; message?: string; responseTime?: number; lastCheck: Date; } /** * Overall health check result */ export interface HealthCheckResult { status: HealthStatus; timestamp: Date; uptime: number; version: string; dependencies: DependencyHealth[]; circuitBreakers?: Record<string, { state: string; metrics: unknown }>; details?: Record<string, unknown>; } /** * Health check configuration */ export interface HealthCheckConfig { timeout?: number; // Timeout for dependency checks in ms } /** * Health Check Service * Monitors application and dependency health */ export class HealthCheckService { private config: Required<HealthCheckConfig>; private startTime: Date; private version: string; private lastHealthCheck?: HealthCheckResult; /** * Create a new health check service * @param config - Health check configuration */ constructor(config?: HealthCheckConfig) { this.config = { timeout: config?.timeout || 5000, // Default 5 seconds }; this.startTime = new Date(); this.version = process.env.npm_package_version || '1.0.0'; } /** * Perform comprehensive health check * @returns Health check result */ async check(): Promise<HealthCheckResult> { const checkStartTime = Date.now(); const dependencies: DependencyHealth[] = []; // Future: Add dependency checks here as needed // Determine overall status const overallStatus = this.determineOverallStatus(dependencies); const result: HealthCheckResult = { status: overallStatus, timestamp: new Date(), uptime: Date.now() - this.startTime.getTime(), version: this.version, dependencies, details: { checkDuration: Date.now() - checkStartTime, memory: process.memoryUsage(), nodeVersion: process.version, }, }; this.lastHealthCheck = result; return result; } /** * Quick health check (no dependency checks) * Useful for liveness probes */ async quickCheck(): Promise<{ status: HealthStatus; uptime: number }> { return { status: 'healthy', uptime: Date.now() - this.startTime.getTime(), }; } /** * Determine overall health status from dependencies */ private determineOverallStatus(dependencies: DependencyHealth[]): HealthStatus { if (dependencies.length === 0) { return 'healthy'; } const hasUnhealthy = dependencies.some((dep) => dep.status === 'unhealthy'); const hasDegraded = dependencies.some((dep) => dep.status === 'degraded'); if (hasUnhealthy) { return 'unhealthy'; } if (hasDegraded) { return 'degraded'; } return 'healthy'; } /** * Get last health check result */ getLastHealthCheck(): HealthCheckResult | undefined { return this.lastHealthCheck; } } /** * Create a health check service */ export function createHealthCheckService(config?: HealthCheckConfig): HealthCheckService { return new HealthCheckService(config); } /** * Singleton health check service */ let defaultHealthCheckService: HealthCheckService | null = null; /** * Get or create the default health check service */ export function getHealthCheckService(config?: HealthCheckConfig): HealthCheckService { if (!defaultHealthCheckService) { defaultHealthCheckService = new HealthCheckService(config); } return defaultHealthCheckService; } /** * Reset the default health check service */ export function resetHealthCheckService(): void { defaultHealthCheckService = null; }