seth.computer
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1import * as fs from "node:fs";
2import * as path from "node:path";
3
4const DATA_DIR = process.env.DATA_DIR || "./data";
5const LOG_PATH = path.join(DATA_DIR, "app.log");
6
7type LogLevel = "INFO" | "WARN" | "ERROR" | "DEBUG";
8
9function formatDate(date: Date): string {
10 return date.toISOString();
11}
12
13function writeLog(
14 level: LogLevel,
15 message: string,
16 meta?: Record<string, any>,
17) {
18 const timestamp = formatDate(new Date());
19 const metaStr = meta ? ` ${JSON.stringify(meta)}` : "";
20 const logLine = `[${timestamp}] ${level}: ${message}${metaStr}\n`;
21
22 // Write to file
23 try {
24 fs.appendFileSync(LOG_PATH, logLine);
25 } catch (err) {
26 // Fall back to console if file write fails
27 console.error("Failed to write to log file:", err);
28 }
29
30 // Also write to stdout/stderr for systemd journal
31 if (level === "ERROR") {
32 process.stderr.write(logLine);
33 } else {
34 process.stdout.write(logLine);
35 }
36}
37
38export const logger = {
39 info: (message: string, meta?: Record<string, any>) =>
40 writeLog("INFO", message, meta),
41 warn: (message: string, meta?: Record<string, any>) =>
42 writeLog("WARN", message, meta),
43 error: (message: string, meta?: Record<string, any>) =>
44 writeLog("ERROR", message, meta),
45 debug: (message: string, meta?: Record<string, any>) => {
46 if (process.env.DEBUG) {
47 writeLog("DEBUG", message, meta);
48 }
49 },
50};