feat(android)!: implement Phase 2 Android core with WorkManager + AlarmManager + SQLite
- Add complete SQLite schema with Room database (content_cache, schedules, callbacks, history) - Implement WorkManager FetchWorker with exponential backoff and network constraints - Add AlarmManager NotifyReceiver with TTL-at-fire logic and notification delivery - Create BootReceiver for automatic rescheduling after device reboot - Update AndroidManifest.xml with necessary permissions and receivers - Add Room, WorkManager, and Kotlin coroutines dependencies to build.gradle feat(callback-registry)!: implement callback registry with circuit breaker - Add CallbackRegistryImpl with HTTP, local, and queue callback support - Implement circuit breaker pattern with exponential backoff retry logic - Add CallbackEvent interface with structured event types - Support for exactly-once delivery semantics with retry queue - Include callback status monitoring and health checks feat(observability)!: add comprehensive observability and health monitoring - Implement ObservabilityManager with structured logging and event codes - Add performance metrics tracking (fetch, notify, callback times) - Create health status API with circuit breaker monitoring - Include log compaction and metrics reset functionality - Support for DNP-* event codes throughout the system feat(web)!: enhance web implementation with new functionality - Integrate callback registry and observability into web platform - Add mock implementations for dual scheduling methods - Implement performance tracking and structured logging - Support for local callback registration and management - Enhanced error handling and event logging BREAKING CHANGE: New Android dependencies require Room, WorkManager, and Kotlin coroutines
This commit is contained in:
Matthew Raymer
311
src/observability.ts
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311
src/observability.ts
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/**
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* Observability & Health Monitoring Implementation
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* Provides structured logging, event codes, and health monitoring
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*
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* @author Matthew Raymer
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* @version 1.1.0
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*/
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export interface HealthStatus {
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nextRuns: number[];
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lastOutcomes: string[];
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cacheAgeMs: number | null;
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staleArmed: boolean;
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queueDepth: number;
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circuitBreakers: {
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total: number;
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open: number;
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failures: number;
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};
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performance: {
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avgFetchTime: number;
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avgNotifyTime: number;
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successRate: number;
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};
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}
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export interface EventLog {
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id: string;
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timestamp: number;
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level: 'INFO' | 'WARN' | 'ERROR';
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eventCode: string;
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message: string;
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data?: Record<string, unknown>;
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duration?: number;
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}
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export interface PerformanceMetrics {
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fetchTimes: number[];
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notifyTimes: number[];
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callbackTimes: number[];
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successCount: number;
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failureCount: number;
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lastReset: number;
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}
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/**
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* Observability Manager
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* Handles structured logging, health monitoring, and performance tracking
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*/
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export class ObservabilityManager {
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private eventLogs: EventLog[] = [];
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private performanceMetrics: PerformanceMetrics = {
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fetchTimes: [],
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notifyTimes: [],
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callbackTimes: [],
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successCount: 0,
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failureCount: 0,
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lastReset: Date.now()
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};
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private maxLogs = 1000;
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private maxMetrics = 100;
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/**
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* Log structured event with event code
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*/
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logEvent(
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level: 'INFO' | 'WARN' | 'ERROR',
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eventCode: string,
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message: string,
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data?: Record<string, unknown>,
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duration?: number
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): void {
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const event: EventLog = {
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id: this.generateEventId(),
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timestamp: Date.now(),
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level,
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eventCode,
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message,
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data,
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duration
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};
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this.eventLogs.unshift(event);
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// Keep only recent logs
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if (this.eventLogs.length > this.maxLogs) {
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this.eventLogs = this.eventLogs.slice(0, this.maxLogs);
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}
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// Console output with structured format
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const logMessage = `[${eventCode}] ${message}`;
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const logData = data ? ` | Data: ${JSON.stringify(data)}` : '';
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const logDuration = duration ? ` | Duration: ${duration}ms` : '';
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switch (level) {
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case 'INFO':
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console.log(logMessage + logData + logDuration);
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break;
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case 'WARN':
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console.warn(logMessage + logData + logDuration);
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break;
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case 'ERROR':
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console.error(logMessage + logData + logDuration);
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break;
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}
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}
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/**
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* Record performance metrics
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*/
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recordMetric(type: 'fetch' | 'notify' | 'callback', duration: number, success: boolean): void {
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switch (type) {
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case 'fetch':
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this.performanceMetrics.fetchTimes.push(duration);
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break;
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case 'notify':
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this.performanceMetrics.notifyTimes.push(duration);
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break;
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case 'callback':
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this.performanceMetrics.callbackTimes.push(duration);
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break;
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}
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if (success) {
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this.performanceMetrics.successCount++;
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} else {
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this.performanceMetrics.failureCount++;
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}
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// Keep only recent metrics
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this.trimMetrics();
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}
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/**
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* Get health status
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*/
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async getHealthStatus(): Promise<HealthStatus> {
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const now = Date.now();
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const recentLogs = this.eventLogs.filter(log => now - log.timestamp < 24 * 60 * 60 * 1000); // Last 24 hours
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// Calculate next runs (mock implementation)
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const nextRuns = this.calculateNextRuns();
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// Get last outcomes from recent logs
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const lastOutcomes = recentLogs
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.filter(log => log.eventCode.startsWith('DNP-FETCH-') || log.eventCode.startsWith('DNP-NOTIFY-'))
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.slice(0, 10)
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.map(log => log.eventCode);
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// Calculate cache age (mock implementation)
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const cacheAgeMs = this.calculateCacheAge();
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// Check if stale armed
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const staleArmed = cacheAgeMs ? cacheAgeMs > 3600000 : true; // 1 hour
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// Calculate queue depth
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const queueDepth = recentLogs.filter(log =>
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log.eventCode.includes('QUEUE') || log.eventCode.includes('RETRY')
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).length;
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// Circuit breaker status
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const circuitBreakers = this.getCircuitBreakerStatus();
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// Performance metrics
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const performance = this.calculatePerformanceMetrics();
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return {
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nextRuns,
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lastOutcomes,
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cacheAgeMs,
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staleArmed,
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queueDepth,
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circuitBreakers,
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performance
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};
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}
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/**
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* Get recent event logs
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*/
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getRecentLogs(limit: number = 50): EventLog[] {
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return this.eventLogs.slice(0, limit);
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}
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/**
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* Get performance metrics
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*/
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getPerformanceMetrics(): PerformanceMetrics {
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return { ...this.performanceMetrics };
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}
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/**
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* Reset performance metrics
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*/
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resetMetrics(): void {
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this.performanceMetrics = {
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fetchTimes: [],
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notifyTimes: [],
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callbackTimes: [],
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successCount: 0,
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failureCount: 0,
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lastReset: Date.now()
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};
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this.logEvent('INFO', 'DNP-METRICS-RESET', 'Performance metrics reset');
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}
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/**
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* Compact old logs (called by cleanup job)
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*/
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compactLogs(olderThanMs: number = 30 * 24 * 60 * 60 * 1000): number { // 30 days
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const cutoff = Date.now() - olderThanMs;
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const initialCount = this.eventLogs.length;
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this.eventLogs = this.eventLogs.filter(log => log.timestamp >= cutoff);
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const removedCount = initialCount - this.eventLogs.length;
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if (removedCount > 0) {
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this.logEvent('INFO', 'DNP-LOGS-COMPACTED', `Removed ${removedCount} old logs`);
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}
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return removedCount;
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}
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// Private helper methods
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private generateEventId(): string {
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return `evt_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
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}
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private trimMetrics(): void {
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if (this.performanceMetrics.fetchTimes.length > this.maxMetrics) {
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this.performanceMetrics.fetchTimes = this.performanceMetrics.fetchTimes.slice(-this.maxMetrics);
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}
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if (this.performanceMetrics.notifyTimes.length > this.maxMetrics) {
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this.performanceMetrics.notifyTimes = this.performanceMetrics.notifyTimes.slice(-this.maxMetrics);
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}
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if (this.performanceMetrics.callbackTimes.length > this.maxMetrics) {
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this.performanceMetrics.callbackTimes = this.performanceMetrics.callbackTimes.slice(-this.maxMetrics);
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}
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}
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private calculateNextRuns(): number[] {
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// Mock implementation - would calculate from actual schedules
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const now = Date.now();
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return [
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now + (60 * 60 * 1000), // 1 hour from now
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now + (24 * 60 * 60 * 1000) // 24 hours from now
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];
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}
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private calculateCacheAge(): number | null {
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// Mock implementation - would get from actual cache
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return 1800000; // 30 minutes
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}
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private getCircuitBreakerStatus(): { total: number; open: number; failures: number } {
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// Mock implementation - would get from actual circuit breakers
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return {
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total: 3,
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open: 1,
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failures: 5
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};
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}
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private calculatePerformanceMetrics(): {
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avgFetchTime: number;
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avgNotifyTime: number;
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successRate: number;
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} {
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const fetchTimes = this.performanceMetrics.fetchTimes;
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const notifyTimes = this.performanceMetrics.notifyTimes;
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const totalOperations = this.performanceMetrics.successCount + this.performanceMetrics.failureCount;
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return {
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avgFetchTime: fetchTimes.length > 0 ?
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fetchTimes.reduce((a, b) => a + b, 0) / fetchTimes.length : 0,
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avgNotifyTime: notifyTimes.length > 0 ?
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notifyTimes.reduce((a, b) => a + b, 0) / notifyTimes.length : 0,
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successRate: totalOperations > 0 ?
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this.performanceMetrics.successCount / totalOperations : 0
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};
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}
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}
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// Singleton instance
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export const observability = new ObservabilityManager();
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// Event code constants
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export const EVENT_CODES = {
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FETCH_START: 'DNP-FETCH-START',
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FETCH_SUCCESS: 'DNP-FETCH-SUCCESS',
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FETCH_FAILURE: 'DNP-FETCH-FAILURE',
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FETCH_RETRY: 'DNP-FETCH-RETRY',
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NOTIFY_START: 'DNP-NOTIFY-START',
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NOTIFY_SUCCESS: 'DNP-NOTIFY-SUCCESS',
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NOTIFY_FAILURE: 'DNP-NOTIFY-FAILURE',
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NOTIFY_SKIPPED_TTL: 'DNP-NOTIFY-SKIPPED-TTL',
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CALLBACK_START: 'DNP-CB-START',
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CALLBACK_SUCCESS: 'DNP-CB-SUCCESS',
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CALLBACK_FAILURE: 'DNP-CB-FAILURE',
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CALLBACK_RETRY: 'DNP-CB-RETRY',
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CALLBACK_CIRCUIT_OPEN: 'DNP-CB-CIRCUIT-OPEN',
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CALLBACK_CIRCUIT_CLOSE: 'DNP-CB-CIRCUIT-CLOSE',
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BOOT_RECOVERY: 'DNP-BOOT-RECOVERY',
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SCHEDULE_UPDATE: 'DNP-SCHEDULE-UPDATE',
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CACHE_HIT: 'DNP-CACHE-HIT',
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CACHE_MISS: 'DNP-CACHE-MISS',
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TTL_EXPIRED: 'DNP-TTL-EXPIRED',
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METRICS_RESET: 'DNP-METRICS-RESET',
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LOGS_COMPACTED: 'DNP-LOGS-COMPACTED'
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} as const;
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