{"version":3,"file":"api-metrics.mjs","sources":["../../../../src/lib/api/advanced/api-metrics.ts"],"sourcesContent":["/**\n * API Metrics\n *\n * Collects and reports API performance metrics including\n * latency, error rates, and throughput.\n *\n * @module api/advanced/api-metrics\n */\n\n// =============================================================================\n// Types\n// =============================================================================\n\n/**\n * Single request metric.\n */\nexport interface RequestMetric {\n /** Request URL/endpoint */\n endpoint: string;\n /** HTTP method */\n method: string;\n /** Response status code */\n status: number;\n /** Request duration in milliseconds */\n duration: number;\n /** Request timestamp */\n timestamp: number;\n /** Whether request succeeded */\n success: boolean;\n /** Error message if failed */\n error?: string;\n /** Request size in bytes */\n requestSize?: number;\n /** Response size in bytes */\n responseSize?: number;\n /** Correlation ID */\n correlationId?: string;\n /** Custom tags */\n tags?: Record;\n}\n\n/**\n * Aggregated metrics for an endpoint.\n */\nexport interface EndpointMetrics {\n /** Endpoint path */\n endpoint: string;\n /** Total request count */\n totalRequests: number;\n /** Successful requests */\n successCount: number;\n /** Failed requests */\n errorCount: number;\n /** Success rate (0-1) */\n successRate: number;\n /** Average duration in ms */\n avgDuration: number;\n /** Minimum duration in ms */\n minDuration: number;\n /** Maximum duration in ms */\n maxDuration: number;\n /** P50 latency in ms */\n p50Latency: number;\n /** P90 latency in ms */\n p90Latency: number;\n /** P95 latency in ms */\n p95Latency: number;\n /** P99 latency in ms */\n p99Latency: number;\n /** Status code distribution */\n statusCodes: Record;\n /** Error distribution */\n errors: Record;\n /** Last request timestamp */\n lastRequestAt: number;\n /** Requests per second (recent) */\n requestsPerSecond: number;\n}\n\n/**\n * Overall API metrics.\n */\nexport interface OverallMetrics {\n /** Total requests across all endpoints */\n totalRequests: number;\n /** Total successful requests */\n totalSuccess: number;\n /** Total failed requests */\n totalErrors: number;\n /** Overall success rate */\n successRate: number;\n /** Overall average duration */\n avgDuration: number;\n /** Overall P95 latency */\n p95Latency: number;\n /** Total requests per second */\n requestsPerSecond: number;\n /** Unique endpoints count */\n endpointCount: number;\n /** Metrics collection start time */\n collectionStartedAt: number;\n /** Time window in milliseconds */\n windowMs: number;\n}\n\n/**\n * Metrics collector configuration.\n */\nexport interface MetricsConfig {\n /** Maximum number of metrics to store */\n maxMetrics?: number;\n /** Time window for aggregation (ms) */\n windowMs?: number;\n /** Flush interval for reporters (ms) */\n flushInterval?: number;\n /** Enable detailed per-request storage */\n enableDetailedMetrics?: boolean;\n /** Endpoints to exclude from collection */\n excludeEndpoints?: string[];\n /** Custom metric reporter */\n reporter?: MetricsReporter;\n}\n\n/**\n * Metrics reporter interface.\n */\nexport interface MetricsReporter {\n /** Report a single metric */\n report: (metric: RequestMetric) => void;\n /** Flush all metrics */\n flush: (metrics: RequestMetric[]) => void;\n /** Report aggregated metrics */\n reportAggregated?: (metrics: OverallMetrics) => void;\n}\n\n// =============================================================================\n// API Metrics Collector Class\n// =============================================================================\n\n/**\n * API Metrics Collector for performance monitoring.\n *\n * @example\n * ```typescript\n * const metrics = new APIMetricsCollector({\n * maxMetrics: 10000,\n * windowMs: 60000,\n * reporter: {\n * report: (metric) => console.log(metric),\n * flush: (metrics) => sendToAnalytics(metrics),\n * },\n * });\n *\n * // Record a metric\n * metrics.record({\n * endpoint: '/users',\n * method: 'GET',\n * status: 200,\n * duration: 150,\n * timestamp: Date.now(),\n * success: true,\n * });\n *\n * // Get endpoint metrics\n * const userMetrics = metrics.getEndpointMetrics('/users');\n * console.log(`P95 latency: ${userMetrics.p95Latency}ms`);\n * ```\n */\nexport class APIMetricsCollector {\n private config: Required;\n private metrics: RequestMetric[];\n private endpointCache: Map;\n private collectionStartedAt: number;\n private readonly flushTimer?: ReturnType;\n\n /**\n * Create a new metrics collector.\n *\n * @param config - Collector configuration\n */\n constructor(config: MetricsConfig = {}) {\n this.config = {\n maxMetrics: 10000,\n windowMs: 300000, // 5 minutes\n flushInterval: 60000, // 1 minute\n enableDetailedMetrics: true,\n excludeEndpoints: [],\n reporter: { report: () => {}, flush: () => {} },\n ...config,\n };\n\n this.metrics = [];\n this.endpointCache = new Map();\n this.collectionStartedAt = Date.now();\n\n // Start flush timer\n if (this.config.flushInterval > 0) {\n this.flushTimer = setInterval(() => {\n this.flush();\n }, this.config.flushInterval);\n }\n }\n\n // ===========================================================================\n // Recording Methods\n // ===========================================================================\n\n /**\n * Record a request metric.\n *\n * @param metric - Metric to record\n */\n record(metric: RequestMetric): void {\n // Check exclusions\n if (this.shouldExclude(metric.endpoint)) {\n return;\n }\n\n // Store metric\n if (this.config.enableDetailedMetrics) {\n this.metrics.push(metric);\n\n // Enforce max size\n if (this.metrics.length > this.config.maxMetrics) {\n this.metrics = this.metrics.slice(-this.config.maxMetrics);\n }\n }\n\n // Update endpoint cache for quick aggregation\n const cacheKey = this.getEndpointKey(metric.endpoint, metric.method);\n const durations = this.endpointCache.get(cacheKey) ?? [];\n durations.push(metric.duration);\n\n // Keep only recent durations\n if (durations.length > 1000) {\n durations.splice(0, durations.length - 1000);\n }\n\n this.endpointCache.set(cacheKey, durations);\n\n // Report to reporter\n this.config.reporter.report(metric);\n }\n\n /**\n * Create a timing wrapper for requests.\n *\n * @param endpoint - Request endpoint\n * @param method - HTTP method\n * @param tags - Custom tags\n * @returns Timing functions\n */\n startTiming(\n endpoint: string,\n method: string,\n tags?: Record\n ): {\n success: (status: number, responseSize?: number) => void;\n error: (error: Error, status?: number) => void;\n } {\n const startTime = Date.now();\n const correlationId = crypto.randomUUID();\n\n return {\n success: (status: number, responseSize?: number) => {\n this.record({\n endpoint,\n method,\n status,\n duration: Date.now() - startTime,\n timestamp: startTime,\n success: true,\n responseSize,\n correlationId,\n tags,\n });\n },\n error: (error: Error, status = 0) => {\n this.record({\n endpoint,\n method,\n status,\n duration: Date.now() - startTime,\n timestamp: startTime,\n success: false,\n error: error.message,\n correlationId,\n tags,\n });\n },\n };\n }\n\n // ===========================================================================\n // Aggregation Methods\n // ===========================================================================\n\n /**\n * Get metrics for a specific endpoint.\n *\n * @param endpoint - Endpoint path\n * @param method - Optional HTTP method filter\n * @returns Aggregated endpoint metrics\n */\n getEndpointMetrics(endpoint: string, method?: string): EndpointMetrics {\n const windowStart = Date.now() - this.config.windowMs;\n\n const relevantMetrics = this.metrics.filter(\n (m) =>\n m.endpoint === endpoint &&\n (method == null || method === '' || m.method === method) &&\n m.timestamp >= windowStart\n );\n\n return this.aggregateMetrics(endpoint, relevantMetrics);\n }\n\n /**\n * Get overall API metrics.\n */\n getOverallMetrics(): OverallMetrics {\n const windowStart = Date.now() - this.config.windowMs;\n const now = Date.now();\n\n const relevantMetrics = this.metrics.filter((m) => m.timestamp >= windowStart);\n\n const durations = relevantMetrics.map((m) => m.duration).sort((a, b) => a - b);\n const successCount = relevantMetrics.filter((m) => m.success).length;\n const endpoints = new Set(relevantMetrics.map((m) => m.endpoint));\n\n const windowSeconds = (now - windowStart) / 1000;\n\n return {\n totalRequests: relevantMetrics.length,\n totalSuccess: successCount,\n totalErrors: relevantMetrics.length - successCount,\n successRate: relevantMetrics.length > 0 ? successCount / relevantMetrics.length : 1,\n avgDuration:\n durations.length > 0 ? durations.reduce((a, b) => a + b, 0) / durations.length : 0,\n p95Latency: this.percentile(durations, 95),\n requestsPerSecond: windowSeconds > 0 ? relevantMetrics.length / windowSeconds : 0,\n endpointCount: endpoints.size,\n collectionStartedAt: this.collectionStartedAt,\n windowMs: this.config.windowMs,\n };\n }\n\n /**\n * Get metrics for all endpoints.\n */\n getAllEndpointMetrics(): EndpointMetrics[] {\n const endpoints = new Set(this.metrics.map((m) => `${m.method}:${m.endpoint}`));\n const results: EndpointMetrics[] = [];\n\n for (const key of endpoints) {\n const [method, ...endpointParts] = key.split(':');\n const endpoint = endpointParts.join(':');\n results.push(this.getEndpointMetrics(endpoint, method));\n }\n\n return results.sort((a, b) => b.totalRequests - a.totalRequests);\n }\n\n /**\n * Get slow requests.\n *\n * @param threshold - Duration threshold in ms\n * @param limit - Maximum results\n */\n getSlowRequests(threshold: number, limit = 100): RequestMetric[] {\n return this.metrics\n .filter((m) => m.duration >= threshold)\n .sort((a, b) => b.duration - a.duration)\n .slice(0, limit);\n }\n\n /**\n * Get recent errors.\n *\n * @param limit - Maximum results\n */\n getRecentErrors(limit = 100): RequestMetric[] {\n return this.metrics\n .filter((m) => !m.success)\n .sort((a, b) => b.timestamp - a.timestamp)\n .slice(0, limit);\n }\n\n /**\n * Get error distribution.\n */\n getErrorDistribution(): Record {\n const distribution: Record = {};\n\n for (const metric of this.metrics.filter((m) => !m.success)) {\n const key = metric.error ?? `HTTP ${metric.status}`;\n distribution[key] = (distribution[key] ?? 0) + 1;\n }\n\n return distribution;\n }\n\n // ===========================================================================\n // Export & Reporting\n // ===========================================================================\n\n /**\n * Flush metrics to reporter.\n */\n flush(): void {\n if (this.metrics.length === 0) return;\n\n const metricsToFlush = [...this.metrics];\n this.config.reporter.flush(metricsToFlush);\n\n if (this.config.reporter.reportAggregated) {\n this.config.reporter.reportAggregated(this.getOverallMetrics());\n }\n }\n\n /**\n * Export metrics as JSON.\n */\n exportJSON(): string {\n return JSON.stringify({\n overall: this.getOverallMetrics(),\n endpoints: this.getAllEndpointMetrics(),\n metrics: this.config.enableDetailedMetrics ? this.metrics : [],\n });\n }\n\n /**\n * Export metrics as CSV.\n */\n exportCSV(): string {\n const headers = ['timestamp', 'endpoint', 'method', 'status', 'duration', 'success', 'error'];\n\n const rows = this.metrics.map((m) => [\n new Date(m.timestamp).toISOString(),\n m.endpoint,\n m.method,\n m.status,\n m.duration,\n m.success,\n m.error ?? 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