Rafael Foster
47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
/**
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* Modul: Logger
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* Zweck: Levelbasiertes strukturiertes Logging ohne externe Dependencies.
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* Ausgabe als JSON in Production, lesbar in Development.
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* Steuerung: LOG_LEVEL env var (debug, info, warn, error). Default: info.
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*/
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const LEVELS = { debug: 0, info: 1, warn: 2, error: 3 };
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const currentLevel = LEVELS[process.env.LOG_LEVEL] ?? LEVELS.info;
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const isProduction = process.env.NODE_ENV === 'production';
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function emit(level, mod, msg, extra) {
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if (LEVELS[level] < currentLevel) return;
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const normalizedExtra = extra instanceof Error
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? {
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name: extra.name,
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message: extra.message,
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stack: extra.stack,
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}
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: extra;
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if (isProduction) {
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const entry = { ts: new Date().toISOString(), level, mod, msg };
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if (normalizedExtra !== undefined) entry.extra = normalizedExtra;
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process.stdout.write(JSON.stringify(entry) + '\n');
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} else {
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const prefix = `[${mod}]`;
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if (normalizedExtra !== undefined) {
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console[level === 'debug' ? 'log' : level](prefix, msg, normalizedExtra);
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} else {
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console[level === 'debug' ? 'log' : level](prefix, msg);
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}
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}
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}
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function createLogger(mod) {
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return {
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debug: (msg, extra) => emit('debug', mod, msg, extra),
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info: (msg, extra) => emit('info', mod, msg, extra),
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warn: (msg, extra) => emit('warn', mod, msg, extra),
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error: (msg, extra) => emit('error', mod, msg, extra),
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};
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}
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export { createLogger };
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