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import { prisma } from '@/lib/prisma';
type LogLevel = 'debug' | 'info' | 'warn' | 'error';
export type LogCategory =
| 'API'
| 'DATABASE'
| 'AUTH'
| 'CLIENT'
| 'PAYMENT'
| 'ORDER'
| 'CART'
| 'PRODUCT'
| 'SUPPORT'
| 'SYSTEM'
| 'PERFORMANCE'
| 'CRON';
interface LogContext {
url?: string;
method?: string;
statusCode?: number;
userId?: number;
userEmail?: string;
userAgent?: string;
ip?: string;
requestId?: string;
duration?: number;
[key: string]: unknown;
}
interface LogEntry {
timestamp: string;
level: LogLevel;
category: LogCategory;
message: string;
error?: Error | unknown;
context?: LogContext;
}
const isDev = process.env.NODE_ENV === 'development';
const isLoggingEnabled = process.env.ENABLE_LOGGING !== 'false';
const LOG_TO_FILE = process.env.LOG_TO_FILE === 'true';
const LOG_TO_DB = process.env.LOG_TO_DB !== 'false'; // Default true in production
// Generate fingerprint for error grouping
function generateFingerprint(category: string, message: string, stack?: string): string {
const content = `${category}:${message}:${stack?.split('\n')[1] || ''}`;
return crypto.createHash('md5').update(content).digest('hex');
}
// Format log for console/file output
function formatLog(entry: LogEntry): string {
const { timestamp, level, category, message, context } = entry;
const prefix = `[${timestamp}] ${level.toUpperCase()} [${category}]`;
let output = `${prefix} ${message}`;
if (context) {
const extras = Object.entries(context)
.filter(([, v]) => v !== undefined)
.map(([k, v]) => `${k}=${typeof v === 'object' ? JSON.stringify(v) : v}`)
.join(' ');
if (extras) output += ` | ${extras}`;
}
return output;
}
// Write to file (async, non-blocking)
async function writeToFile(entry: LogEntry): Promise<void> {
if (!LOG_TO_FILE) return;
try {
const fs = await import('fs/promises');
const path = await import('path');
const logDir = path.join(process.cwd(), 'logs');
const date = new Date().toISOString().split('T')[0];
const filename = `${entry.level === 'error' ? 'error' : 'app'}-${date}.log`;
const filepath = path.join(logDir, filename);
// Ensure log directory exists
await fs.mkdir(logDir, { recursive: true });
const logLine = JSON.stringify({
...entry,
error: entry.error instanceof Error ? {
name: entry.error.name,
message: entry.error.message,
stack: entry.error.stack} : entry.error}) + '\n';
await fs.appendFile(filepath, logLine);
} catch (err) {
console.error('Failed to write to log file:', err);
}
}
// Write to database (async, non-blocking)
async function writeToDatabase(entry: LogEntry): Promise<void> {
if (!LOG_TO_DB || isDev) return;
if (entry.level === 'debug' || entry.level === 'info') return; // Only store warn/error
// Skip database writes during CI builds (no database available)
if (process.env.CI === "true") return;
try {
const fingerprint = generateFingerprint(
entry.category,
entry.message,
entry.error instanceof Error ? entry.error.stack : undefined
);
// Create error log entry
await prisma.errorLog.create({
data: {
fingerprint,
level: entry.level,
category: entry.category,
message: entry.message,
stack: entry.error instanceof Error ? entry.error.stack : undefined,
url: entry.context?.url,
method: entry.context?.method,
statusCode: entry.context?.statusCode,
userId: entry.context?.userId,
userEmail: entry.context?.userEmail,
userAgent: entry.context?.userAgent,
ip: entry.context?.ip,
requestId: entry.context?.requestId,
metadata: entry.context ? JSON.parse(JSON.stringify(entry.context)) : undefined}});
// Update or create error statistics
await prisma.errorStatistic.upsert({
where: { fingerprint },
update: {
count: { increment: 1 },
lastSeen: new Date()},
create: {
fingerprint,
category: entry.category,
message: entry.message.substring(0, 500),
count: 1,
firstSeen: new Date(),
lastSeen: new Date()}});
} catch (err) {
console.error('Failed to write to database:', err);
}
}
// Import alert function lazily to avoid circular dependencies
let sendErrorAlertEmail: ((data: LogEntry) => Promise<void>) | null = null;
async function getAlertFunction() {
if (!sendErrorAlertEmail) {
try {
const alerts = await import('@/lib/monitoring/alerts');
sendErrorAlertEmail = alerts.sendErrorAlertEmail;
} catch {
// Alerts module not available yet
sendErrorAlertEmail = async () => { };
}
}
return sendErrorAlertEmail;
}
// Main logger object
export const monitoringLogger = {
debug(category: LogCategory, message: string, context?: LogContext) {
if (!isDev) return;
const entry: LogEntry = {
timestamp: new Date().toISOString(),
level: 'debug',
category,
message,
context};
console.debug(formatLog(entry));
},
info(category: LogCategory, message: string, context?: LogContext) {
if (!isLoggingEnabled) return;
const entry: LogEntry = {
timestamp: new Date().toISOString(),
level: 'info',
category,
message,
context};
console.log(formatLog(entry));
writeToFile(entry).catch(() => { });
},
warn(category: LogCategory, message: string, context?: LogContext) {
const entry: LogEntry = {
timestamp: new Date().toISOString(),
level: 'warn',
category,
message,
context};
console.warn(formatLog(entry));
writeToFile(entry).catch(() => { });
writeToDatabase(entry).catch(() => { });
},
async error(category: LogCategory, message: string, error?: unknown, context?: LogContext) {
const entry: LogEntry = {
timestamp: new Date().toISOString(),
level: 'error',
category,
message,
error,
context: {
...context,
errorMessage: error instanceof Error ? error.message : String(error)}};
console.error(formatLog(entry));
if (error instanceof Error && error.stack) {
console.error(error.stack);
}
writeToFile(entry).catch(() => { });
writeToDatabase(entry).catch(() => { });
// Send email alert for critical errors
if (context?.statusCode === 500 || category === 'DATABASE' || category === 'PAYMENT') {
const alertFn = await getAlertFunction();
alertFn(entry).catch(() => { });
}
},
// Performance timing helper
time(category: LogCategory, label: string): () => void {
const start = performance.now();
return () => {
const duration = performance.now() - start;
this.info(category, `${label} completed`, { duration: Number(duration.toFixed(2)) });
if (duration > 1000) {
this.warn(category, `Slow operation: ${label}`, { duration: Number(duration.toFixed(2)) });
}
};
}};
export default monitoringLogger;
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