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* Simple logging utility for the application
* Provides consistent timestamp and context formatting
*/
type LogLevel = "INFO" | "WARN" | "ERROR" | "DEBUG";
interface LogEntry {
timestamp: string;
level: LogLevel;
context: string;
message: string;
data?: unknown;
}
/**
* Format log entry with timestamp and context
*/
function formatLogEntry(level: LogLevel, context: string, message: string, data?: unknown): LogEntry {
const entry: LogEntry = {
timestamp: new Date().toISOString(),
level,
context,
message};
if (data !== undefined) {
entry.data = data;
}
return entry;
}
/**
* Log an info message
*/
export function logInfo(context: string, message: string, data?: unknown): void {
const entry = formatLogEntry("INFO", context, message, data);
// eslint-disable-next-line no-console
console.log(`[${entry.timestamp}] ${entry.level} [${entry.context}]: ${entry.message}`, data || "");
}
/**
* Log a warning message
*/
export function logWarn(context: string, message: string, data?: unknown): void {
const entry = formatLogEntry("WARN", context, message, data);
console.warn(`[${entry.timestamp}] ${entry.level} [${entry.context}]: ${entry.message}`, data || "");
}
/**
* Log an error message
*/
export function logError(context: string, message: string, error?: unknown): void {
let errorData: unknown = error;
if (error instanceof Error) {
errorData = {
name: error.name,
message: error.message,
stack: error.stack};
}
const entry = formatLogEntry("ERROR", context, message, errorData);
console.error(
`[${entry.timestamp}] ${entry.level} [${entry.context}]: ${entry.message}`,
errorData || ""
);
}
/**
* Log a debug message (only in development)
*/
export function logDebug(context: string, message: string, data?: unknown): void {
if (process.env.NODE_ENV === "development") {
const entry = formatLogEntry("DEBUG", context, message, data);
// eslint-disable-next-line no-console
console.debug(`[${entry.timestamp}] ${entry.level} [${entry.context}]: ${entry.message}`, data || "");
}
}
/**
* Log an API request
*/
export function logRequest(
method: string,
path: string,
statusCode?: number,
userId?: string,
duration?: number
): void {
const durationStr = duration ? ` (${duration}ms)` : "";
const userStr = userId ? ` (user: ${userId})` : "";
const statusStr = statusCode ? ` -> ${statusCode}` : "";
logInfo("API", `${method} ${path}${statusStr}${userStr}${durationStr}`);
}
/**
* Log authentication event
*/
export function logAuth(event: string, email: string, success: boolean): void {
const message = `${event} - ${email} - ${success ? "SUCCESS" : "FAILED"}`;
logInfo("AUTH", message);
}
/**
* Log database operation
*/
export function logDatabase(operation: string, model: string, duration?: number): void {
const durationStr = duration ? ` (${duration}ms)` : "";
logDebug("DATABASE", `${operation} on ${model}${durationStr}`);
}
/**
* Log rate limit event
*/
export function logRateLimit(identifier: string, limit: number, remaining: number): void {
logWarn(
"RATE_LIMIT",
`Rate limit approaching for ${identifier}`,
{ limit, remaining }
);
}
export const logger = {
info: logInfo,
warn: logWarn,
error: logError,
debug: logDebug,
request: logRequest,
auth: logAuth,
database: logDatabase,
rateLimit: logRateLimit};
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