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35 KiB
Debug and Trace Configuration
You are a debugging expert specializing in setting up comprehensive debugging environments, distributed tracing, and diagnostic tools. Configure debugging workflows, implement tracing solutions, and establish troubleshooting practices for development and production environments.
Context
The user needs to set up debugging and tracing capabilities to efficiently diagnose issues, track down bugs, and understand system behavior. Focus on developer productivity, production debugging, distributed tracing, and comprehensive logging strategies.
Requirements
$ARGUMENTS
Instructions
1. Development Environment Debugging
Set up comprehensive debugging environments:
VS Code Debug Configuration
// .vscode/launch.json
{
"version": "0.2.0",
"configurations": [
{
"name": "Debug Node.js App",
"type": "node",
"request": "launch",
"runtimeExecutable": "node",
"runtimeArgs": ["--inspect-brk", "--enable-source-maps"],
"program": "${workspaceFolder}/src/index.js",
"env": {
"NODE_ENV": "development",
"DEBUG": "*",
"NODE_OPTIONS": "--max-old-space-size=4096"
},
"sourceMaps": true,
"resolveSourceMapLocations": [
"${workspaceFolder}/**",
"!**/node_modules/**"
],
"skipFiles": ["<node_internals>/**", "node_modules/**"],
"console": "integratedTerminal",
"outputCapture": "std"
},
{
"name": "Debug TypeScript",
"type": "node",
"request": "launch",
"program": "${workspaceFolder}/src/index.ts",
"preLaunchTask": "tsc: build - tsconfig.json",
"outFiles": ["${workspaceFolder}/dist/**/*.js"],
"sourceMaps": true,
"smartStep": true,
"internalConsoleOptions": "openOnSessionStart"
},
{
"name": "Debug Jest Tests",
"type": "node",
"request": "launch",
"program": "${workspaceFolder}/node_modules/.bin/jest",
"args": [
"--runInBand",
"--no-cache",
"--watchAll=false",
"--detectOpenHandles"
],
"console": "integratedTerminal",
"internalConsoleOptions": "neverOpen",
"env": {
"NODE_ENV": "test"
}
},
{
"name": "Attach to Process",
"type": "node",
"request": "attach",
"processId": "${command:PickProcess}",
"protocol": "inspector",
"restart": true,
"sourceMaps": true
}
],
"compounds": [
{
"name": "Full Stack Debug",
"configurations": ["Debug Backend", "Debug Frontend"],
"stopAll": true
}
]
}
Chrome DevTools Configuration
// debug-helpers.js
class DebugHelper {
constructor() {
this.setupDevTools();
this.setupConsoleHelpers();
this.setupPerformanceMarkers();
}
setupDevTools() {
if (typeof window !== "undefined") {
// Add debug namespace
window.DEBUG = window.DEBUG || {};
// Store references to important objects
window.DEBUG.store = () => window.__REDUX_STORE__;
window.DEBUG.router = () => window.__ROUTER__;
window.DEBUG.components = new Map();
// Performance debugging
window.DEBUG.measureRender = (componentName) => {
performance.mark(`${componentName}-start`);
return () => {
performance.mark(`${componentName}-end`);
performance.measure(
componentName,
`${componentName}-start`,
`${componentName}-end`,
);
};
};
// Memory debugging
window.DEBUG.heapSnapshot = async () => {
if ("memory" in performance) {
const snapshot = await performance.measureUserAgentSpecificMemory();
console.table(snapshot);
return snapshot;
}
};
}
}
setupConsoleHelpers() {
// Enhanced console logging
const styles = {
error: "color: #ff0000; font-weight: bold;",
warn: "color: #ff9800; font-weight: bold;",
info: "color: #2196f3; font-weight: bold;",
debug: "color: #4caf50; font-weight: bold;",
trace: "color: #9c27b0; font-weight: bold;",
};
Object.entries(styles).forEach(([level, style]) => {
const original = console[level];
console[level] = function (...args) {
if (process.env.NODE_ENV === "development") {
const timestamp = new Date().toISOString();
original.call(
console,
`%c[${timestamp}] ${level.toUpperCase()}:`,
style,
...args,
);
}
};
});
}
}
// React DevTools integration
if (process.env.NODE_ENV === "development") {
// Expose React internals
window.__REACT_DEVTOOLS_GLOBAL_HOOK__ = {
...window.__REACT_DEVTOOLS_GLOBAL_HOOK__,
onCommitFiberRoot: (id, root) => {
// Custom commit logging
console.debug("React commit:", root);
},
};
}
2. Remote Debugging Setup
Configure remote debugging capabilities:
Remote Debug Server
// remote-debug-server.js
const inspector = require('inspector');
const WebSocket = require('ws');
const http = require('http');
class RemoteDebugServer {
constructor(options = {}) {
this.port = options.port || 9229;
this.host = options.host || '0.0.0.0';
this.wsPort = options.wsPort || 9230;
this.sessions = new Map();
}
start() {
// Open inspector
inspector.open(this.port, this.host, true);
// Create WebSocket server for remote connections
this.wss = new WebSocket.Server({ port: this.wsPort });
this.wss.on('connection', (ws) => {
const sessionId = this.generateSessionId();
this.sessions.set(sessionId, ws);
ws.on('message', (message) => {
this.handleDebugCommand(sessionId, message);
});
ws.on('close', () => {
this.sessions.delete(sessionId);
});
// Send initial session info
ws.send(JSON.stringify({
type: 'session',
sessionId,
debugUrl: `chrome-devtools://devtools/bundled/inspector.html?ws=${this.host}:${this.port}`
}));
});
console.log(`Remote debug server listening on ws://${this.host}:${this.wsPort}`);
}
handleDebugCommand(sessionId, message) {
const command = JSON.parse(message);
switch (command.type) {
case 'evaluate':
this.evaluateExpression(sessionId, command.expression);
break;
case 'setBreakpoint':
this.setBreakpoint(command.file, command.line);
break;
case 'heapSnapshot':
this.takeHeapSnapshot(sessionId);
break;
case 'profile':
this.startProfiling(sessionId, command.duration);
break;
}
}
evaluateExpression(sessionId, expression) {
const session = new inspector.Session();
session.connect();
session.post('Runtime.evaluate', {
expression,
generatePreview: true,
includeCommandLineAPI: true
}, (error, result) => {
const ws = this.sessions.get(sessionId);
if (ws) {
ws.send(JSON.stringify({
type: 'evaluateResult',
result: result || error
}));
}
});
session.disconnect();
}
}
// Docker remote debugging setup
FROM node:18
RUN apt-get update && apt-get install -y \
chromium \
gdb \
strace \
tcpdump \
vim
EXPOSE 9229 9230
ENV NODE_OPTIONS="--inspect=0.0.0.0:9229"
CMD ["node", "--inspect-brk=0.0.0.0:9229", "index.js"]
3. Distributed Tracing
Implement comprehensive distributed tracing:
OpenTelemetry Setup
// tracing.js
const { NodeSDK } = require("@opentelemetry/sdk-node");
const {
getNodeAutoInstrumentations,
} = require("@opentelemetry/auto-instrumentations-node");
const { Resource } = require("@opentelemetry/resources");
const {
SemanticResourceAttributes,
} = require("@opentelemetry/semantic-conventions");
const { JaegerExporter } = require("@opentelemetry/exporter-jaeger");
const { BatchSpanProcessor } = require("@opentelemetry/sdk-trace-base");
class TracingSystem {
constructor(serviceName) {
this.serviceName = serviceName;
this.sdk = null;
}
initialize() {
const jaegerExporter = new JaegerExporter({
endpoint:
process.env.JAEGER_ENDPOINT || "http://localhost:14268/api/traces",
});
const resource = Resource.default().merge(
new Resource({
[SemanticResourceAttributes.SERVICE_NAME]: this.serviceName,
[SemanticResourceAttributes.SERVICE_VERSION]:
process.env.SERVICE_VERSION || "1.0.0",
[SemanticResourceAttributes.DEPLOYMENT_ENVIRONMENT]:
process.env.NODE_ENV || "development",
}),
);
this.sdk = new NodeSDK({
resource,
spanProcessor: new BatchSpanProcessor(jaegerExporter),
instrumentations: [
getNodeAutoInstrumentations({
"@opentelemetry/instrumentation-fs": {
enabled: false, // Too noisy
},
"@opentelemetry/instrumentation-http": {
requestHook: (span, request) => {
span.setAttribute(
"http.request.body",
JSON.stringify(request.body),
);
},
responseHook: (span, response) => {
span.setAttribute("http.response.size", response.length);
},
},
"@opentelemetry/instrumentation-express": {
requestHook: (span, req) => {
span.setAttribute("user.id", req.user?.id);
span.setAttribute("session.id", req.session?.id);
},
},
}),
],
});
this.sdk.start();
// Graceful shutdown
process.on("SIGTERM", () => {
this.sdk
.shutdown()
.then(() => console.log("Tracing terminated"))
.catch((error) => console.error("Error terminating tracing", error))
.finally(() => process.exit(0));
});
}
// Custom span creation
createSpan(name, fn, attributes = {}) {
const tracer = trace.getTracer(this.serviceName);
return tracer.startActiveSpan(name, async (span) => {
try {
// Add custom attributes
Object.entries(attributes).forEach(([key, value]) => {
span.setAttribute(key, value);
});
// Execute function
const result = await fn(span);
span.setStatus({ code: SpanStatusCode.OK });
return result;
} catch (error) {
span.recordException(error);
span.setStatus({
code: SpanStatusCode.ERROR,
message: error.message,
});
throw error;
} finally {
span.end();
}
});
}
}
// Distributed tracing middleware
class TracingMiddleware {
constructor() {
this.tracer = trace.getTracer("http-middleware");
}
express() {
return (req, res, next) => {
const span = this.tracer.startSpan(`${req.method} ${req.path}`, {
kind: SpanKind.SERVER,
attributes: {
"http.method": req.method,
"http.url": req.url,
"http.target": req.path,
"http.host": req.hostname,
"http.scheme": req.protocol,
"http.user_agent": req.get("user-agent"),
"http.request_content_length": req.get("content-length"),
},
});
// Inject trace context into request
req.span = span;
req.traceId = span.spanContext().traceId;
// Add trace ID to response headers
res.setHeader("X-Trace-Id", req.traceId);
// Override res.end to capture response data
const originalEnd = res.end;
res.end = function (...args) {
span.setAttribute("http.status_code", res.statusCode);
span.setAttribute(
"http.response_content_length",
res.get("content-length"),
);
if (res.statusCode >= 400) {
span.setStatus({
code: SpanStatusCode.ERROR,
message: `HTTP ${res.statusCode}`,
});
}
span.end();
originalEnd.apply(res, args);
};
next();
};
}
}
4. Debug Logging Framework
Implement structured debug logging:
Advanced Logger
// debug-logger.js
const winston = require("winston");
const { ElasticsearchTransport } = require("winston-elasticsearch");
class DebugLogger {
constructor(options = {}) {
this.service = options.service || "app";
this.level = process.env.LOG_LEVEL || "debug";
this.logger = this.createLogger();
}
createLogger() {
const formats = [
winston.format.timestamp(),
winston.format.errors({ stack: true }),
winston.format.splat(),
winston.format.json(),
];
if (process.env.NODE_ENV === "development") {
formats.push(winston.format.colorize());
formats.push(winston.format.printf(this.devFormat));
}
const transports = [
new winston.transports.Console({
level: this.level,
handleExceptions: true,
handleRejections: true,
}),
];
// Add file transport for debugging
if (process.env.DEBUG_LOG_FILE) {
transports.push(
new winston.transports.File({
filename: process.env.DEBUG_LOG_FILE,
level: "debug",
maxsize: 10485760, // 10MB
maxFiles: 5,
}),
);
}
// Add Elasticsearch for production
if (process.env.ELASTICSEARCH_URL) {
transports.push(
new ElasticsearchTransport({
level: "info",
clientOpts: {
node: process.env.ELASTICSEARCH_URL,
},
index: `logs-${this.service}`,
}),
);
}
return winston.createLogger({
level: this.level,
format: winston.format.combine(...formats),
defaultMeta: {
service: this.service,
environment: process.env.NODE_ENV,
hostname: require("os").hostname(),
pid: process.pid,
},
transports,
});
}
devFormat(info) {
const { timestamp, level, message, ...meta } = info;
const metaString = Object.keys(meta).length
? "\n" + JSON.stringify(meta, null, 2)
: "";
return `${timestamp} [${level}]: ${message}${metaString}`;
}
// Debug-specific methods
trace(message, meta = {}) {
const stack = new Error().stack;
this.logger.debug(message, {
...meta,
trace: stack,
timestamp: Date.now(),
});
}
timing(label, fn) {
const start = process.hrtime.bigint();
const result = fn();
const end = process.hrtime.bigint();
const duration = Number(end - start) / 1000000; // Convert to ms
this.logger.debug(`Timing: ${label}`, {
duration,
unit: "ms",
});
return result;
}
memory() {
const usage = process.memoryUsage();
this.logger.debug("Memory usage", {
rss: `${Math.round(usage.rss / 1024 / 1024)}MB`,
heapTotal: `${Math.round(usage.heapTotal / 1024 / 1024)}MB`,
heapUsed: `${Math.round(usage.heapUsed / 1024 / 1024)}MB`,
external: `${Math.round(usage.external / 1024 / 1024)}MB`,
});
}
}
// Debug context manager
class DebugContext {
constructor() {
this.contexts = new Map();
}
create(id, metadata = {}) {
const context = {
id,
startTime: Date.now(),
metadata,
logs: [],
spans: [],
};
this.contexts.set(id, context);
return context;
}
log(contextId, level, message, data = {}) {
const context = this.contexts.get(contextId);
if (context) {
context.logs.push({
timestamp: Date.now(),
level,
message,
data,
});
}
}
export(contextId) {
const context = this.contexts.get(contextId);
if (!context) return null;
return {
...context,
duration: Date.now() - context.startTime,
logCount: context.logs.length,
};
}
}
5. Source Map Configuration
Set up source map support for production debugging:
Source Map Setup
// webpack.config.js
module.exports = {
mode: "production",
devtool: "hidden-source-map", // Generate source maps but don't reference them
output: {
filename: "[name].[contenthash].js",
sourceMapFilename: "sourcemaps/[name].[contenthash].js.map",
},
plugins: [
// Upload source maps to error tracking service
new SentryWebpackPlugin({
authToken: process.env.SENTRY_AUTH_TOKEN,
org: "your-org",
project: "your-project",
include: "./dist",
ignore: ["node_modules"],
urlPrefix: "~/",
release: process.env.RELEASE_VERSION,
deleteAfterCompile: true,
}),
],
};
// Runtime source map support
require("source-map-support").install({
environment: "node",
handleUncaughtExceptions: false,
retrieveSourceMap(source) {
// Custom source map retrieval for production
if (process.env.NODE_ENV === "production") {
const sourceMapUrl = getSourceMapUrl(source);
if (sourceMapUrl) {
const map = fetchSourceMap(sourceMapUrl);
return {
url: source,
map: map,
};
}
}
return null;
},
});
// Stack trace enhancement
Error.prepareStackTrace = (error, stack) => {
const mapped = stack.map((frame) => {
const fileName = frame.getFileName();
const lineNumber = frame.getLineNumber();
const columnNumber = frame.getColumnNumber();
// Try to get original position
const original = getOriginalPosition(fileName, lineNumber, columnNumber);
return {
function: frame.getFunctionName() || "<anonymous>",
file: original?.source || fileName,
line: original?.line || lineNumber,
column: original?.column || columnNumber,
native: frame.isNative(),
async: frame.isAsync(),
};
});
return {
message: error.message,
stack: mapped,
};
};
6. Performance Profiling
Implement performance profiling tools:
Performance Profiler
// performance-profiler.js
const v8Profiler = require("v8-profiler-next");
const fs = require("fs");
const path = require("path");
class PerformanceProfiler {
constructor(options = {}) {
this.outputDir = options.outputDir || "./profiles";
this.profiles = new Map();
// Ensure output directory exists
if (!fs.existsSync(this.outputDir)) {
fs.mkdirSync(this.outputDir, { recursive: true });
}
}
startCPUProfile(id, options = {}) {
const title = options.title || `cpu-profile-${id}`;
v8Profiler.startProfiling(title, true);
this.profiles.set(id, {
type: "cpu",
title,
startTime: Date.now(),
});
return id;
}
stopCPUProfile(id) {
const profileInfo = this.profiles.get(id);
if (!profileInfo || profileInfo.type !== "cpu") {
throw new Error(`CPU profile ${id} not found`);
}
const profile = v8Profiler.stopProfiling(profileInfo.title);
const duration = Date.now() - profileInfo.startTime;
// Export profile
const fileName = `${profileInfo.title}-${Date.now()}.cpuprofile`;
const filePath = path.join(this.outputDir, fileName);
profile.export((error, result) => {
if (!error) {
fs.writeFileSync(filePath, result);
console.log(`CPU profile saved to ${filePath}`);
}
profile.delete();
});
this.profiles.delete(id);
return {
id,
duration,
filePath,
};
}
takeHeapSnapshot(tag = "") {
const fileName = `heap-${tag}-${Date.now()}.heapsnapshot`;
const filePath = path.join(this.outputDir, fileName);
const snapshot = v8Profiler.takeSnapshot();
// Export snapshot
snapshot.export((error, result) => {
if (!error) {
fs.writeFileSync(filePath, result);
console.log(`Heap snapshot saved to ${filePath}`);
}
snapshot.delete();
});
return filePath;
}
measureFunction(fn, name = "anonymous") {
const measurements = {
name,
executions: 0,
totalTime: 0,
minTime: Infinity,
maxTime: 0,
avgTime: 0,
lastExecution: null,
};
return new Proxy(fn, {
apply(target, thisArg, args) {
const start = process.hrtime.bigint();
try {
const result = target.apply(thisArg, args);
if (result instanceof Promise) {
return result.finally(() => {
this.recordExecution(start);
});
}
this.recordExecution(start);
return result;
} catch (error) {
this.recordExecution(start);
throw error;
}
},
recordExecution(start) {
const end = process.hrtime.bigint();
const duration = Number(end - start) / 1000000; // Convert to ms
measurements.executions++;
measurements.totalTime += duration;
measurements.minTime = Math.min(measurements.minTime, duration);
measurements.maxTime = Math.max(measurements.maxTime, duration);
measurements.avgTime = measurements.totalTime / measurements.executions;
measurements.lastExecution = new Date();
// Log slow executions
if (duration > 100) {
console.warn(`Slow function execution: ${name} took ${duration}ms`);
}
},
get(target, prop) {
if (prop === "measurements") {
return measurements;
}
return target[prop];
},
});
}
}
// Memory leak detector
class MemoryLeakDetector {
constructor() {
this.snapshots = [];
this.threshold = 50 * 1024 * 1024; // 50MB
}
start(interval = 60000) {
this.interval = setInterval(() => {
this.checkMemory();
}, interval);
}
checkMemory() {
const usage = process.memoryUsage();
const snapshot = {
timestamp: Date.now(),
heapUsed: usage.heapUsed,
external: usage.external,
rss: usage.rss,
};
this.snapshots.push(snapshot);
// Keep only last 10 snapshots
if (this.snapshots.length > 10) {
this.snapshots.shift();
}
// Check for memory leak pattern
if (this.snapshots.length >= 5) {
const trend = this.calculateTrend();
if (trend.increasing && trend.delta > this.threshold) {
console.error("Potential memory leak detected!", {
trend,
current: snapshot,
});
// Take heap snapshot for analysis
const profiler = new PerformanceProfiler();
profiler.takeHeapSnapshot("leak-detection");
}
}
}
calculateTrend() {
const recent = this.snapshots.slice(-5);
const first = recent[0];
const last = recent[recent.length - 1];
const delta = last.heapUsed - first.heapUsed;
const increasing = recent.every(
(s, i) => i === 0 || s.heapUsed > recent[i - 1].heapUsed,
);
return {
increasing,
delta,
rate: (delta / (last.timestamp - first.timestamp)) * 1000 * 60, // MB per minute
};
}
}
7. Debug Configuration Management
Centralize debug configurations:
Debug Configuration
// debug-config.js
class DebugConfiguration {
constructor() {
this.config = {
// Debug levels
levels: {
error: 0,
warn: 1,
info: 2,
debug: 3,
trace: 4,
},
// Feature flags
features: {
remoteDebugging: process.env.ENABLE_REMOTE_DEBUG === "true",
tracing: process.env.ENABLE_TRACING === "true",
profiling: process.env.ENABLE_PROFILING === "true",
memoryMonitoring: process.env.ENABLE_MEMORY_MONITORING === "true",
},
// Debug endpoints
endpoints: {
jaeger: process.env.JAEGER_ENDPOINT || "http://localhost:14268",
elasticsearch: process.env.ELASTICSEARCH_URL || "http://localhost:9200",
sentry: process.env.SENTRY_DSN,
},
// Sampling rates
sampling: {
traces: parseFloat(process.env.TRACE_SAMPLING_RATE || "0.1"),
profiles: parseFloat(process.env.PROFILE_SAMPLING_RATE || "0.01"),
logs: parseFloat(process.env.LOG_SAMPLING_RATE || "1.0"),
},
};
}
isEnabled(feature) {
return this.config.features[feature] || false;
}
getLevel() {
const level = process.env.DEBUG_LEVEL || "info";
return this.config.levels[level] || 2;
}
shouldSample(type) {
const rate = this.config.sampling[type] || 1.0;
return Math.random() < rate;
}
}
// Debug middleware factory
class DebugMiddlewareFactory {
static create(app, config) {
const middlewares = [];
if (config.isEnabled("tracing")) {
const tracingMiddleware = new TracingMiddleware();
middlewares.push(tracingMiddleware.express());
}
if (config.isEnabled("profiling")) {
middlewares.push(this.profilingMiddleware());
}
if (config.isEnabled("memoryMonitoring")) {
const detector = new MemoryLeakDetector();
detector.start();
}
// Debug routes
if (process.env.NODE_ENV === "development") {
app.get("/debug/heap", (req, res) => {
const profiler = new PerformanceProfiler();
const path = profiler.takeHeapSnapshot("manual");
res.json({ heapSnapshot: path });
});
app.get("/debug/profile", async (req, res) => {
const profiler = new PerformanceProfiler();
const id = profiler.startCPUProfile("manual");
setTimeout(() => {
const result = profiler.stopCPUProfile(id);
res.json(result);
}, 10000);
});
app.get("/debug/metrics", (req, res) => {
res.json({
memory: process.memoryUsage(),
cpu: process.cpuUsage(),
uptime: process.uptime(),
});
});
}
return middlewares;
}
static profilingMiddleware() {
const profiler = new PerformanceProfiler();
return (req, res, next) => {
if (Math.random() < 0.01) {
// 1% sampling
const id = profiler.startCPUProfile(`request-${Date.now()}`);
res.on("finish", () => {
profiler.stopCPUProfile(id);
});
}
next();
};
}
}
8. Production Debugging
Enable safe production debugging:
Production Debug Tools
// production-debug.js
class ProductionDebugger {
constructor(options = {}) {
this.enabled = process.env.PRODUCTION_DEBUG === "true";
this.authToken = process.env.DEBUG_AUTH_TOKEN;
this.allowedIPs = (process.env.DEBUG_ALLOWED_IPS || "").split(",");
}
middleware() {
return (req, res, next) => {
if (!this.enabled) {
return next();
}
// Check authorization
const token = req.headers["x-debug-token"];
const ip = req.ip || req.connection.remoteAddress;
if (token !== this.authToken || !this.allowedIPs.includes(ip)) {
return next();
}
// Add debug headers
res.setHeader("X-Debug-Enabled", "true");
// Enable debug mode for this request
req.debugMode = true;
req.debugContext = new DebugContext().create(req.id);
// Override console for this request
const originalConsole = { ...console };
["log", "debug", "info", "warn", "error"].forEach((method) => {
console[method] = (...args) => {
req.debugContext.log(req.id, method, args[0], args.slice(1));
originalConsole[method](...args);
};
});
// Restore console on response
res.on("finish", () => {
Object.assign(console, originalConsole);
// Send debug info if requested
if (req.headers["x-debug-response"] === "true") {
const debugInfo = req.debugContext.export(req.id);
res.setHeader("X-Debug-Info", JSON.stringify(debugInfo));
}
});
next();
};
}
}
// Conditional breakpoints in production
class ConditionalBreakpoint {
constructor(condition, callback) {
this.condition = condition;
this.callback = callback;
this.hits = 0;
}
check(context) {
if (this.condition(context)) {
this.hits++;
// Log breakpoint hit
console.debug("Conditional breakpoint hit", {
condition: this.condition.toString(),
hits: this.hits,
context,
});
// Execute callback
if (this.callback) {
this.callback(context);
}
// In production, don't actually break
if (process.env.NODE_ENV === "production") {
// Take snapshot instead
const profiler = new PerformanceProfiler();
profiler.takeHeapSnapshot(`breakpoint-${Date.now()}`);
} else {
// In development, use debugger
debugger;
}
}
}
}
// Usage
const breakpoints = new Map();
// Set conditional breakpoint
breakpoints.set(
"high-memory",
new ConditionalBreakpoint(
(context) => context.memoryUsage > 500 * 1024 * 1024, // 500MB
(context) => {
console.error("High memory usage detected", context);
// Send alert
alerting.send("high-memory", context);
},
),
);
// Check breakpoints in code
function checkBreakpoints(context) {
breakpoints.forEach((breakpoint) => {
breakpoint.check(context);
});
}
9. Debug Dashboard
Create a debug dashboard for monitoring:
Debug Dashboard
<!-- debug-dashboard.html -->
<!DOCTYPE html>
<html>
<head>
<title>Debug Dashboard</title>
<style>
body {
font-family: monospace;
background: #1e1e1e;
color: #d4d4d4;
}
.container {
max-width: 1200px;
margin: 0 auto;
padding: 20px;
}
.metric {
background: #252526;
padding: 15px;
margin: 10px 0;
border-radius: 5px;
}
.metric h3 {
margin: 0 0 10px 0;
color: #569cd6;
}
.chart {
height: 200px;
background: #1e1e1e;
margin: 10px 0;
}
.log-entry {
padding: 5px;
border-bottom: 1px solid #3e3e3e;
}
.error {
color: #f44747;
}
.warn {
color: #ff9800;
}
.info {
color: #4fc3f7;
}
.debug {
color: #4caf50;
}
</style>
</head>
<body>
<div class="container">
<h1>Debug Dashboard</h1>
<div class="metric">
<h3>System Metrics</h3>
<div id="metrics"></div>
</div>
<div class="metric">
<h3>Memory Usage</h3>
<canvas id="memoryChart" class="chart"></canvas>
</div>
<div class="metric">
<h3>Request Traces</h3>
<div id="traces"></div>
</div>
<div class="metric">
<h3>Debug Logs</h3>
<div id="logs"></div>
</div>
</div>
<script>
// WebSocket connection for real-time updates
const ws = new WebSocket("ws://localhost:9231/debug");
ws.onmessage = (event) => {
const data = JSON.parse(event.data);
switch (data.type) {
case "metrics":
updateMetrics(data.payload);
break;
case "trace":
addTrace(data.payload);
break;
case "log":
addLog(data.payload);
break;
}
};
function updateMetrics(metrics) {
const container = document.getElementById("metrics");
container.innerHTML = `
<div>CPU: ${metrics.cpu.percent}%</div>
<div>Memory: ${metrics.memory.used}MB / ${metrics.memory.total}MB</div>
<div>Uptime: ${metrics.uptime}s</div>
<div>Active Requests: ${metrics.activeRequests}</div>
`;
}
function addTrace(trace) {
const container = document.getElementById("traces");
const entry = document.createElement("div");
entry.className = "log-entry";
entry.innerHTML = `
<span>${trace.timestamp}</span>
<span>${trace.method} ${trace.path}</span>
<span>${trace.duration}ms</span>
<span>${trace.status}</span>
`;
container.insertBefore(entry, container.firstChild);
}
function addLog(log) {
const container = document.getElementById("logs");
const entry = document.createElement("div");
entry.className = `log-entry ${log.level}`;
entry.innerHTML = `
<span>${log.timestamp}</span>
<span>[${log.level.toUpperCase()}]</span>
<span>${log.message}</span>
`;
container.insertBefore(entry, container.firstChild);
// Keep only last 100 logs
while (container.children.length > 100) {
container.removeChild(container.lastChild);
}
}
// Memory usage chart
const memoryChart = document
.getElementById("memoryChart")
.getContext("2d");
const memoryData = [];
function updateMemoryChart(usage) {
memoryData.push({
time: new Date(),
value: usage,
});
// Keep last 50 points
if (memoryData.length > 50) {
memoryData.shift();
}
// Draw chart
// ... chart drawing logic
}
</script>
</body>
</html>
10. IDE Integration
Configure IDE debugging features:
IDE Debug Extensions
// .vscode/extensions.json
{
"recommendations": [
"ms-vscode.vscode-js-debug",
"msjsdiag.debugger-for-chrome",
"ms-vscode.vscode-typescript-tslint-plugin",
"dbaeumer.vscode-eslint",
"ms-azuretools.vscode-docker",
"humao.rest-client",
"eamodio.gitlens",
"usernamehw.errorlens",
"wayou.vscode-todo-highlight",
"formulahendry.code-runner"
]
}
// .vscode/tasks.json
{
"version": "2.0.0",
"tasks": [
{
"label": "Start Debug Server",
"type": "npm",
"script": "debug",
"problemMatcher": [],
"presentation": {
"reveal": "always",
"panel": "dedicated"
}
},
{
"label": "Profile Application",
"type": "shell",
"command": "node --inspect-brk --cpu-prof --cpu-prof-dir=./profiles ${workspaceFolder}/src/index.js",
"problemMatcher": []
},
{
"label": "Memory Snapshot",
"type": "shell",
"command": "node --inspect --expose-gc ${workspaceFolder}/scripts/heap-snapshot.js",
"problemMatcher": []
}
]
}
Output Format
- Debug Configuration: Complete setup for all debugging tools
- Integration Guide: Step-by-step integration instructions
- Troubleshooting Playbook: Common debugging scenarios and solutions
- Performance Baselines: Metrics for comparison
- Debug Scripts: Automated debugging utilities
- Dashboard Setup: Real-time debugging interface
- Documentation: Team debugging guidelines
- Emergency Procedures: Production debugging protocols
Focus on creating a comprehensive debugging environment that enhances developer productivity and enables rapid issue resolution in all environments.