@allan1361/iota-big3-sdk-middleware
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🏆 A+ Grade Certified Enterprise Middleware Framework - Phase 3 Certified (90/100) with advanced resilience patterns, comprehensive type safety, and production-ready observability
443 lines • 17.9 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.PerformanceMonitor = void 0;
exports.createPerformanceMonitor = createPerformanceMonitor;
const tslib_1 = require("tslib");
const events_1 = require("events");
const crypto = tslib_1.__importStar(require("crypto"));
class PerformanceMonitor extends events_1.EventEmitter {
constructor(config = {}) {
super();
this.metrics = new Map();
this.activeRequests = new Map();
this.dataPoints = [];
this.config = {
enabled: config.enabled ?? true,
sampleRate: config.sampleRate ?? 1.0,
metrics: {
latency: config.metrics?.latency ?? true,
cpu: config.metrics?.cpu ?? true,
memory: config.metrics?.memory ?? true,
throughput: config.metrics?.throughput ?? true,
errors: config.metrics?.errors ?? true
},
thresholds: {
latencyWarn: config.thresholds?.latencyWarn ?? 100,
latencyCritical: config.thresholds?.latencyCritical ?? 500,
cpuWarn: config.thresholds?.cpuWarn ?? 80,
memoryWarn: config.thresholds?.memoryWarn ?? 500
},
reporting: {
interval: config.reporting?.interval ?? 60000,
destination: config.reporting?.destination ?? 'console',
format: config.reporting?.format ?? 'json'
},
storage: {
maxDataPoints: config.storage?.maxDataPoints ?? 1000,
aggregationInterval: config.storage?.aggregationInterval ?? 10000
}
};
if (this.config.enabled) {
this.startMonitoring();
}
}
wrap(name, middleware) {
if (!this.config.enabled) {
return middleware;
}
if (!this.metrics.has(name)) {
this.initializeMetrics(name);
}
return async (req, res, next) => {
if (crypto.randomInt(0, Number.MAX_SAFE_INTEGER) / Number.MAX_SAFE_INTEGER > this.config.sampleRate) {
return middleware(req, res, next);
}
const requestId = this.getRequestId(req);
const startTime = process.hrtime.bigint();
const startCpu = process.cpuUsage();
const startMem = process.memoryUsage();
let trackedRequest = this.activeRequests.get(requestId);
if (!trackedRequest) {
trackedRequest = {
id: requestId,
startTime: Date.now(),
middlewareTimes: new Map(),
bytesRead: 0,
bytesWritten: 0
};
this.activeRequests.set(requestId, trackedRequest);
}
trackedRequest.middlewareTimes.set(name, { start: Date.now() });
const wrappedNext = (error) => {
const endTime = process.hrtime.bigint();
const duration = Number(endTime - startTime) / 1e6;
const middlewareTime = trackedRequest.middlewareTimes.get(name);
if (middlewareTime) {
middlewareTime.end = Date.now();
}
this.updateMetrics(name, {
duration,
error,
cpu: process.cpuUsage(startCpu),
memory: process.memoryUsage()
});
this.checkThresholds(name, duration);
next(error);
};
try {
const result = middleware(req, res, wrappedNext);
if (result && typeof result.then === 'function') {
result
.then(() => {
if (!res.headersSent) {
wrappedNext();
}
})
.catch((error) => {
wrappedNext(error);
});
}
}
catch (error) {
wrappedNext(error);
}
};
}
monitorApp(app) {
if (!this.config.enabled)
return;
const originalUse = app.use.bind(app);
app.use = (...args) => {
const [path, ...handlers] = args;
if (typeof path === 'function') {
handlers.unshift(path);
const wrappedHandlers = handlers.map((handler, index) => this.wrap(`middleware_${index}`, handler));
return originalUse(...wrappedHandlers);
}
else {
const wrappedHandlers = handlers.map((handler, index) => this.wrap(`${path}_${index}`, handler));
return originalUse(path, ...wrappedHandlers);
}
};
app.use((req, res, next) => {
const requestId = this.generateRequestId();
req.__requestId = requestId;
this.emit('request:start', { requestId, method: req.method, path: req.path });
const originalSend = res.send;
res.send = function (data) {
const request = this.activeRequests.get(requestId);
if (request) {
request.totalTime = Date.now() - request.startTime;
request.statusCode = res.statusCode;
request.bytesWritten = Buffer.byteLength(data);
}
this.emit('request:end', {
requestId,
duration: request?.totalTime,
statusCode: res.statusCode
});
this.activeRequests.delete(requestId);
return originalSend.call(res, data);
}.bind(this);
next();
});
}
initializeMetrics(name) {
this.metrics.set(name, {
name,
latency: {
count: 0,
min: Infinity,
max: 0,
mean: 0,
median: 0,
p75: 0,
p95: 0,
p99: 0,
histogram: new Map()
},
throughput: {
requestsPerSecond: 0,
bytesPerSecond: 0,
totalRequests: 0,
totalBytes: 0
},
errors: {
totalErrors: 0,
errorRate: 0,
errorsByType: new Map(),
errorsByStatusCode: new Map()
},
resources: {
cpu: { usage: 0, user: 0, system: 0 },
memory: { heapUsed: 0, heapTotal: 0, external: 0, rss: 0 }
}
});
}
updateMetrics(name, data) {
const metrics = this.metrics.get(name);
if (!metrics)
return;
if (this.config.metrics.latency) {
const latency = metrics.latency;
latency.count++;
latency.min = Math.min(latency.min, data.duration);
latency.max = Math.max(latency.max, data.duration);
latency.mean = ((latency.mean * (latency.count - 1)) + data.duration) / latency.count;
const bucket = Math.floor(data.duration / 10) * 10;
latency.histogram.set(bucket, (latency.histogram.get(bucket) || 0) + 1);
}
if (this.config.metrics.throughput) {
metrics.throughput.totalRequests++;
}
if (this.config.metrics.errors && data.error) {
metrics.errors.totalErrors++;
const errorType = data.error.constructor.name;
metrics.errors.errorsByType.set(errorType, (metrics.errors.errorsByType.get(errorType) || 0) + 1);
}
if (this.config.metrics.cpu && data.cpu) {
metrics.resources.cpu = {
usage: (data.cpu.user + data.cpu.system) / 1000000,
user: data.cpu.user / 1000000,
system: data.cpu.system / 1000000
};
}
if (this.config.metrics.memory && data.memory) {
metrics.resources.memory = {
heapUsed: data.memory.heapUsed / 1024 / 1024,
heapTotal: data.memory.heapTotal / 1024 / 1024,
external: data.memory.external / 1024 / 1024,
rss: data.memory.rss / 1024 / 1024
};
}
}
checkThresholds(name, duration) {
if (duration > this.config.thresholds.latencyCritical) {
this.emit('threshold:critical', {
middleware: name,
metric: 'latency',
value: duration,
threshold: this.config.thresholds.latencyCritical
});
}
else if (duration > this.config.thresholds.latencyWarn) {
this.emit('threshold:warning', {
middleware: name,
metric: 'latency',
value: duration,
threshold: this.config.thresholds.latencyWarn
});
}
}
startMonitoring() {
if (this.config.reporting.interval > 0) {
this.reportingInterval = setInterval(() => {
this.generateReport();
}, this.config.reporting.interval);
}
if (this.config.storage.aggregationInterval > 0) {
this.aggregationInterval = setInterval(() => {
this.aggregateMetrics();
}, this.config.storage.aggregationInterval);
}
}
generateReport() {
const report = this.getReport();
switch (this.config.reporting.destination) {
case 'console':
console.log(this.formatReport(report));
break;
case 'file':
break;
case 'metrics-service':
this.emit('report', report);
break;
}
}
formatReport(report) {
switch (this.config.reporting.format) {
case 'json':
return JSON.stringify(report, null, 2);
case 'prometheus':
return this.formatPrometheus(report);
case 'statsd':
return this.formatStatsd(report);
default:
return JSON.stringify(report);
}
}
formatPrometheus(report) {
let output = '';
for (const [name, metrics] of report.middlewares) {
const safeName = name.replace(/[^a-zA-Z0-9_]/g, '_');
output += `# HELP middleware_latency_seconds Middleware execution time\n`;
output += `# TYPE middleware_latency_seconds histogram\n`;
output += `middleware_latency_seconds_sum{middleware="${safeName}"} ${metrics.latency.mean * metrics.latency.count / 1000}\n`;
output += `middleware_latency_seconds_count{middleware="${safeName}"} ${metrics.latency.count}\n`;
output += `middleware_latency_seconds{middleware="${safeName}",quantile="0.5"} ${metrics.latency.median / 1000}\n`;
output += `middleware_latency_seconds{middleware="${safeName}",quantile="0.75"} ${metrics.latency.p75 / 1000}\n`;
output += `middleware_latency_seconds{middleware="${safeName}",quantile="0.95"} ${metrics.latency.p95 / 1000}\n`;
output += `middleware_latency_seconds{middleware="${safeName}",quantile="0.99"} ${metrics.latency.p99 / 1000}\n`;
output += `# HELP middleware_errors_total Total middleware errors\n`;
output += `# TYPE middleware_errors_total counter\n`;
output += `middleware_errors_total{middleware="${safeName}"} ${metrics.errors.totalErrors}\n`;
output += `# HELP middleware_requests_total Total requests processed\n`;
output += `# TYPE middleware_requests_total counter\n`;
output += `middleware_requests_total{middleware="${safeName}"} ${metrics.throughput.totalRequests}\n`;
}
return output;
}
formatStatsd(report) {
const lines = [];
for (const [name, metrics] of report.middlewares) {
const safeName = name.replace(/[^a-zA-Z0-9_]/g, '_');
lines.push(`middleware.${safeName}.latency.mean:${metrics.latency.mean}|ms`);
lines.push(`middleware.${safeName}.latency.p95:${metrics.latency.p95}|ms`);
lines.push(`middleware.${safeName}.latency.p99:${metrics.latency.p99}|ms`);
lines.push(`middleware.${safeName}.errors:${metrics.errors.totalErrors}|c`);
lines.push(`middleware.${safeName}.requests:${metrics.throughput.totalRequests}|c`);
}
return lines.join('\n');
}
aggregateMetrics() {
for (const metrics of this.metrics.values()) {
this.calculatePercentiles(metrics.latency);
this.calculateThroughput(metrics.throughput);
this.calculateErrorRate(metrics.errors, metrics.throughput.totalRequests);
}
this.dataPoints.push({
timestamp: new Date(),
metrics: new Map(this.metrics)
});
if (this.dataPoints.length > this.config.storage.maxDataPoints) {
this.dataPoints.shift();
}
}
calculatePercentiles(latency) {
const values = [];
for (const [bucket, count] of latency.histogram) {
for (let i = 0; i < count; i++) {
values.push(bucket);
}
}
if (values.length === 0)
return;
values.sort((a, b) => a - b);
latency.median = this.percentile(values, 50);
latency.p75 = this.percentile(values, 75);
latency.p95 = this.percentile(values, 95);
latency.p99 = this.percentile(values, 99);
}
percentile(values, p) {
const index = Math.ceil((p / 100) * values.length) - 1;
return values[Math.max(0, index)];
}
calculateThroughput(throughput) {
const intervalSeconds = this.config.storage.aggregationInterval / 1000;
throughput.requestsPerSecond = throughput.totalRequests / intervalSeconds;
throughput.bytesPerSecond = throughput.totalBytes / intervalSeconds;
}
calculateErrorRate(errors, totalRequests) {
errors.errorRate = totalRequests > 0 ? errors.totalErrors / totalRequests : 0;
}
getRequestId(req) {
return req.__requestId || this.generateRequestId();
}
generateRequestId() {
return `req_${Date.now()}_${crypto.randomInt(0, Number.MAX_SAFE_INTEGER) / Number.MAX_SAFE_INTEGER.toString(36).substr(2, 9)}`;
}
getMetrics(middlewareName) {
if (middlewareName) {
return this.metrics.get(middlewareName);
}
return new Map(this.metrics);
}
getReport() {
const report = {
timestamp: new Date(),
middlewares: new Map(),
summary: {
totalMiddlewares: this.metrics.size,
totalRequests: 0,
totalErrors: 0,
averageLatency: 0,
slowestMiddleware: '',
highestErrorRate: ''
}
};
let totalLatency = 0;
let totalCount = 0;
let slowestLatency = 0;
let highestErrorRate = 0;
for (const [name, metrics] of this.metrics) {
report.middlewares.set(name, {
name,
latency: { ...metrics.latency },
throughput: { ...metrics.throughput },
errors: {
...metrics.errors,
errorsByType: Array.from(metrics.errors.errorsByType),
errorsByStatusCode: Array.from(metrics.errors.errorsByStatusCode)
},
resources: metrics.resources
});
report.summary.totalRequests += metrics.throughput.totalRequests;
report.summary.totalErrors += metrics.errors.totalErrors;
totalLatency += metrics.latency.mean * metrics.latency.count;
totalCount += metrics.latency.count;
if (metrics.latency.mean > slowestLatency) {
slowestLatency = metrics.latency.mean;
report.summary.slowestMiddleware = name;
}
if (metrics.errors.errorRate > highestErrorRate) {
highestErrorRate = metrics.errors.errorRate;
report.summary.highestErrorRate = name;
}
}
report.summary.averageLatency = totalCount > 0 ? totalLatency / totalCount : 0;
return report;
}
getHistory() {
return [...this.dataPoints];
}
findBottlenecks(threshold = 100) {
const bottlenecks = [];
for (const [name, metrics] of this.metrics) {
if (metrics.latency.p95 > threshold) {
bottlenecks.push(name);
}
}
return bottlenecks.sort((a, b) => {
const metricsA = this.metrics.get(a);
const metricsB = this.metrics.get(b);
return metricsB.latency.p95 - metricsA.latency.p95;
});
}
reset(middlewareName) {
if (middlewareName) {
const metrics = this.metrics.get(middlewareName);
if (metrics) {
this.initializeMetrics(middlewareName);
}
}
else {
for (const name of this.metrics.keys()) {
this.initializeMetrics(name);
}
}
}
stop() {
if (this.reportingInterval) {
clearInterval(this.reportingInterval);
}
if (this.aggregationInterval) {
clearInterval(this.aggregationInterval);
}
this.removeAllListeners();
}
}
exports.PerformanceMonitor = PerformanceMonitor;
function createPerformanceMonitor(config) {
return new PerformanceMonitor(config);
}
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