Maxim Dolgolyov
be4d43105e
Node.js/Express backend + vanilla JS frontend. Features: real-time collaborative whiteboard (SSE), multi-page support, LaTeX formulas, shapes/connectors, coordinate systems, number lines, compass, zoom/pan, Catmull-Rom pencil smoothing, ruler/protractor with rotation & resize controls, minimap navigation overlay, auto-measurements, multi-page thumbnails sidebar, PNG export, page templates. Student/teacher workflows: classes, assignments, library, dashboard. Mobile responsive. SQLite (better-sqlite3). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
'use strict';
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/* ── Structured logger — JSON in prod, pretty in dev ──────────────────────
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Usage: logger.info('msg', { key: val })
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logger.error('msg', { err: e.message })
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──────────────────────────────────────────────────────────────────────── */
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const LEVELS = { error: 0, warn: 1, info: 2, debug: 3 };
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const COLORS = {
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error: '\x1b[31m', // red
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warn: '\x1b[33m', // yellow
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info: '\x1b[36m', // cyan
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debug: '\x1b[90m', // gray
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};
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const RESET = '\x1b[0m';
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const isProd = process.env.NODE_ENV === 'production';
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function _currentLevel() {
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const env = process.env.LOG_LEVEL;
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if (env && LEVELS[env] !== undefined) return LEVELS[env];
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return isProd ? LEVELS.info : LEVELS.debug;
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}
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function log(level, msg, meta) {
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if (LEVELS[level] > _currentLevel()) return;
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const ts = new Date().toISOString();
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if (isProd) {
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/* JSON — one line per entry, parseable by log aggregators */
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const entry = { level, ts, msg };
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if (meta && typeof meta === 'object') Object.assign(entry, meta);
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process.stdout.write(JSON.stringify(entry) + '\n');
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} else {
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/* Pretty — coloured label + message + optional meta */
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const color = COLORS[level] || '';
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const label = `[${ts}] ${color}${level.toUpperCase().padEnd(5)}${RESET}`;
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const metaStr = meta && Object.keys(meta).length
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? ' ' + JSON.stringify(meta, null, 0)
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: '';
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process.stdout.write(`${label} ${msg}${metaStr}\n`);
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}
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}
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const logger = {
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error: (msg, meta) => log('error', msg, meta),
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warn: (msg, meta) => log('warn', msg, meta),
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info: (msg, meta) => log('info', msg, meta),
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debug: (msg, meta) => log('debug', msg, meta),
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/* Convenience: log an Error object */
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exception: (msg, err, meta) => log('error', msg, {
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err: err?.message,
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stack: !isProd ? err?.stack : undefined,
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...meta,
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}),
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};
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module.exports = logger;
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