Add built-in backup of the data folder (BL-0044)
The reader owns a scheduled backup into BACKUP (Compose: BACKUP_PATH mounted at /backup, off when unset). A run pauses the scraper queue through its control API, waits (bounded) until no job is active, writes a verified tar.gz of DATA with db.json from memory and scraper/queue.json stored paused, excludes runtime/lock/pid/temp files, resumes only a queue it paused, then applies count- or day-based retention to its own archive names only. Schedule, retention, "Back up now" and last result live in Settings > Service health. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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'use strict';
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/*
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* Built-in backup of the reader's DATA tree into BACKUP (see docs/backup.md).
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*
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* One run: pause the scraper queue through its control API, wait (bounded) until no
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* job is active, write a gzip'd tar of DATA into BACKUP, resume the queue only if this
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* run paused it, then apply retention. No container stops. db.json comes from the
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* reader's in-memory state; scraper/queue.json is stored with `paused: true` so a
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* restored copy never starts downloading by itself. Runtime/lock/pid/temp files are
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* left out. Retention only ever deletes `circus-YYYYMMDD-HHMMSS.tar.gz` files directly
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* inside BACKUP. No dependencies: the tar writer/reader below is plain ustar + PAX.
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*/
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const fs = require('fs'), fsp = fs.promises, path = require('path'), zlib = require('zlib');
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const { Readable } = require('stream'), { pipeline } = require('stream/promises');
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const ARCHIVE = /^circus-(\d{4})(\d{2})(\d{2})-(\d{2})(\d{2})(\d{2})\.tar\.gz$/;
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const PART = /^circus-\d{8}-\d{6}\.tar\.gz\.part$/;
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const EXCLUDE = [/^runtime.*\.json$/, /\.lock$/, /\.pid$/, /\.tmp$/];
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const DEFAULT_SETTINGS = { enabled: false, time: '03:30', retention: { mode: 'count', value: 14 } };
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const RETENTION_LIMITS = { count: [1, 365], days: [1, 3650] };
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const CATCH_UP_MS = 24 * 3600e3;
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class BackupError extends Error { constructor(code, msg) { super(msg); this.code = code; } }
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const delay = ms => new Promise(resolve => setTimeout(resolve, ms));
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const pad = n => String(n).padStart(2, '0');
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const stampOf = d => `${d.getFullYear()}${pad(d.getMonth() + 1)}${pad(d.getDate())}-${pad(d.getHours())}${pad(d.getMinutes())}${pad(d.getSeconds())}`;
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const archiveTime = name => { const m = ARCHIVE.exec(name); return m ? new Date(+m[1], m[2] - 1, +m[3], +m[4], +m[5], +m[6]).getTime() : NaN; };
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const message = e => String((e && e.message) || e).slice(0, 500);
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function validateSettings(input, current = DEFAULT_SETTINGS) {
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const next = { ...current, retention: { ...current.retention } };
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if (input.enabled !== undefined) {
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if (typeof input.enabled !== 'boolean') throw new BackupError(400, 'enabled must be true or false');
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next.enabled = input.enabled;
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}
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if (input.time !== undefined) {
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if (!/^([01]\d|2[0-3]):[0-5]\d$/.test(String(input.time))) throw new BackupError(400, 'The backup time must be HH:MM');
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next.time = String(input.time);
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}
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if (input.retention !== undefined) {
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const mode = input.retention && input.retention.mode, value = Number(input.retention && input.retention.value);
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const limits = RETENTION_LIMITS[mode];
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if (!limits) throw new BackupError(400, 'Retention is "count" or "days"');
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if (!Number.isInteger(value) || value < limits[0] || value > limits[1]) throw new BackupError(400, `Keep ${limits[0]}–${limits[1]} ${mode === 'count' ? 'backups' : 'days'}`);
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next.retention = { mode, value };
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}
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return next;
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}
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// Next local occurrence of HH:MM strictly after `now` (process TZ).
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function nextOccurrence(time, now) {
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const [hh, mm] = time.split(':').map(Number), d = new Date(now);
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const at = new Date(d.getFullYear(), d.getMonth(), d.getDate(), hh, mm, 0, 0);
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if (at.getTime() <= now) at.setDate(at.getDate() + 1);
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return at.getTime();
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}
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// ---------- tar (ustar + PAX path records), enough for `tar -xzf` everywhere ----------
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function octal(buf, offset, length, value) { buf.write(value.toString(8).padStart(length - 1, '0') + '\0', offset, length, 'ascii'); }
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function rawHeader(name, { size = 0, mode = 0o644, uid = 0, gid = 0, mtime = 0, type = '0' }) {
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const b = Buffer.alloc(512);
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b.write(name, 0, 100, 'utf8');
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octal(b, 100, 8, mode & 0o7777); octal(b, 108, 8, uid & 0o7777777); octal(b, 116, 8, gid & 0o7777777);
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octal(b, 124, 12, size); octal(b, 136, 12, Math.max(0, Math.floor(mtime / 1000)));
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b.write(' ', 148, 8, 'ascii');
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b.write(type, 156, 1, 'ascii');
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b.write('ustar\0' + '00', 257, 8, 'ascii');
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let sum = 0; for (const byte of b) sum += byte;
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b.write(sum.toString(8).padStart(6, '0') + '\0 ', 148, 8, 'ascii');
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return b;
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}
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const padding = size => Buffer.alloc((512 - (size % 512)) % 512);
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function paxRecord(key, value) {
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const body = ` ${key}=${value}\n`, bytes = Buffer.byteLength(body);
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let length = bytes + String(bytes).length;
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if (String(length).length !== String(bytes).length) length = bytes + String(length).length;
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return `${length}${body}`;
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}
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function tarEntry(name, data, meta) {
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const parts = [];
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// Names longer than the ustar field or non-ASCII go into a PAX header first.
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if (Buffer.byteLength(name) > 100 || /[^\x20-\x7e]/.test(name)) {
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const pax = Buffer.from(paxRecord('path', name), 'utf8');
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parts.push(rawHeader('PaxHeader/' + name.replace(/[^\x20-\x7e]/g, '_').slice(-80), { size: pax.length, type: 'x', mtime: meta.mtime }), pax, padding(pax.length));
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name = name.replace(/[^\x20-\x7e]/g, '_').slice(-100);
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}
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parts.push(rawHeader(name, { ...meta, size: data ? data.length : 0 }));
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if (data && data.length) parts.push(data, padding(data.length));
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return parts;
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}
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// Streaming reader for verification and tests: [{ name, type, size, mode, mtime, data? }].
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async function readArchive(file, { contents = false } = {}) {
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const entries = []; let pending = Buffer.alloc(0), current = null, paxPath = null, ended = false;
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const consume = chunk => {
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pending = pending.length ? Buffer.concat([pending, chunk]) : chunk;
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for (;;) {
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if (ended) return;
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if (current) {
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if (pending.length < current.need) return;
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const body = pending.subarray(0, current.size);
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if (current.entry.type === 'x') paxPath = /(?:^|\n)\d+ path=([^\n]*)\n/.exec(body.toString('utf8'))?.[1] ?? null;
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else { if (contents) current.entry.data = Buffer.from(body); entries.push(current.entry); }
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pending = pending.subarray(current.need); current = null; continue;
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}
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if (pending.length < 512) return;
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const h = pending.subarray(0, 512); pending = pending.subarray(512);
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if (h.every(byte => byte === 0)) { ended = true; return; }
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let sum = 0; for (let i = 0; i < 512; i++) sum += i >= 148 && i < 156 ? 32 : h[i];
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if (sum !== parseInt(h.toString('ascii', 148, 156), 8)) throw new Error('Corrupt tar header');
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const field = (o, l) => h.toString('utf8', o, o + l).replace(/\0.*$/s, '');
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const size = parseInt(field(124, 12), 8) || 0, type = field(156, 1) || '0';
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const prefix = field(345, 155), name = prefix ? prefix + '/' + field(0, 100) : field(0, 100);
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const entry = { name: type === 'x' ? name : (paxPath ?? name), type, size, mode: parseInt(field(100, 8), 8), mtime: parseInt(field(136, 12), 8) * 1000 };
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if (type !== 'x') paxPath = null;
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current = { entry, size, need: size + padding(size).length };
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}
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};
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await pipeline(fs.createReadStream(file), zlib.createGunzip(), async function* (source) { for await (const chunk of source) consume(chunk); });
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if (!ended) throw new Error('Archive ends without the tar end marker');
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return entries;
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}
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class BackupService {
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/**
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* dataRoot DATA (read) backupRoot BACKUP (rw) or '' = feature off
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* stateFile settings + history snapshotDb () => db.json text from memory
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* scraper { state(), control(action) } or null
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*/
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constructor({ dataRoot, backupRoot, stateFile, snapshotDb, scraper = null, now = Date.now, log = console,
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idleTimeoutMs = 15 * 60e3, pollMs = 2000, resumeRetryMs = 5000 }) {
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this.dataRoot = path.resolve(dataRoot);
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this.backupRoot = backupRoot ? path.resolve(backupRoot) : '';
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this.stateFile = stateFile || path.join(this.dataRoot, 'backup.json');
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this.snapshotDb = snapshotDb; this.scraper = scraper; this.now = now; this.log = log;
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this.idleTimeoutMs = idleTimeoutMs; this.pollMs = pollMs; this.resumeRetryMs = resumeRetryMs;
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this.state = { version: 1, settings: { ...DEFAULT_SETTINGS }, nextAt: null, last: null, history: [], pending: null };
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this.running = null; this.archives = []; this.targetError = null; this.timer = null;
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}
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load() {
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try { Object.assign(this.state, JSON.parse(fs.readFileSync(this.stateFile, 'utf8'))); }
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catch (e) { if (e.code !== 'ENOENT') this.log.warn(`[backup] ignoring unreadable ${this.stateFile}: ${e.message}`); }
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this.state.settings = validateSettings(this.state.settings || {}, DEFAULT_SETTINGS);
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this.state.history = Array.isArray(this.state.history) ? this.state.history.slice(-10) : [];
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return this;
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}
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persist() {
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fs.writeFileSync(this.stateFile + '.tmp', JSON.stringify(this.state, null, 2) + '\n');
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fs.renameSync(this.stateFile + '.tmp', this.stateFile);
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}
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// A run interrupted by a restart may have left the queue paused on its behalf.
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async recoverInterrupted() {
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const pending = this.state.pending;
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if (!pending) return;
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this.state.pending = null;
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const result = { at: pending.startedAt, trigger: pending.trigger, error: 'Interrupted by a reader restart', warnings: [] };
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if (pending.pausedByUs) {
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try { await this.resume(); result.warnings.push('Queue resumed after the interrupted backup'); }
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catch (e) { result.warnings.push(`Queue left paused: ${message(e)}`); }
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}
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this.record(result);
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}
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async refreshTarget() {
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if (!this.backupRoot) { this.targetError = null; this.archives = []; return; }
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try {
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const st = await fsp.stat(this.backupRoot);
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if (!st.isDirectory()) throw new Error('not a directory');
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await fsp.access(this.backupRoot, fs.constants.W_OK);
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const names = (await fsp.readdir(this.backupRoot)).filter(name => ARCHIVE.test(name)).sort();
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this.archives = await Promise.all(names.map(async name => ({ name, size: (await fsp.stat(path.join(this.backupRoot, name))).size, at: archiveTime(name) })));
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this.targetError = null;
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} catch (e) { this.targetError = `Backup folder ${this.backupRoot} is not usable: ${e.code || message(e)}`; this.archives = []; }
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}
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publicState() {
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const s = this.state;
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return {
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configured: !!this.backupRoot, path: this.backupRoot || null, targetError: this.targetError,
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settings: s.settings, nextAt: s.settings.enabled && this.backupRoot ? s.nextAt : null,
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running: this.running && { ...this.running }, last: s.last, history: s.history.slice().reverse(),
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archives: { count: this.archives.length, bytes: this.archives.reduce((n, a) => n + a.size, 0),
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newest: this.archives.length ? this.archives[this.archives.length - 1].name : null },
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};
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}
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updateSettings(input) {
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this.state.settings = validateSettings(input || {}, this.state.settings);
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this.state.nextAt = this.state.settings.enabled ? nextOccurrence(this.state.settings.time, this.now()) : null;
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this.persist();
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return this.publicState();
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}
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start(intervalMs = 30000) {
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this.load();
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this.refreshTarget().then(() => this.recoverInterrupted()).catch(e => this.log.error('[backup]', message(e)));
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this.timer = setInterval(() => this.tick(), intervalMs);
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this.timer.unref?.();
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return this;
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}
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stop() { clearInterval(this.timer); }
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// Scheduled runs: catch up a missed slot from the last day, never older ones
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// (e.g. right after restoring an old backup.json).
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async tick() {
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const s = this.state.settings, now = this.now();
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if (!s.enabled || !this.backupRoot || this.running) return null;
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if (!this.state.nextAt) { this.state.nextAt = nextOccurrence(s.time, now); this.persist(); return null; }
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if (now < this.state.nextAt) return null;
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const due = now - this.state.nextAt < CATCH_UP_MS;
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this.state.nextAt = nextOccurrence(s.time, now); this.persist();
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return due ? this.run('schedule').catch(() => null) : null;
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}
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/** Starts a run and resolves with its result; rejects at once when no run is possible. */
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run(trigger = 'manual') {
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if (!this.backupRoot) return Promise.reject(new BackupError(409, 'Backups are off: set BACKUP to a mounted folder'));
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if (this.running) return Promise.reject(new BackupError(409, 'A backup is already running'));
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this.running = { startedAt: this.now(), trigger, phase: 'starting' };
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return this.perform(trigger).finally(() => { this.running = null; });
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}
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async perform(trigger) {
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const started = this.now(), result = { at: started, trigger, warnings: [] };
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let part = null, pausedByUs = false;
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try {
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await this.refreshTarget();
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if (this.targetError) throw new Error(this.targetError);
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await this.removeStaleParts();
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// 1. Pause the queue (unless already paused) and wait for the active chapter.
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let scraperState = null;
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if (this.scraper) {
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try { scraperState = await this.scraper.state(); }
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catch (e) { result.warnings.push(`Scraper unreachable, queue not paused: ${message(e)}`); }
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}
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if (scraperState) {
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result.queueWasPaused = !!scraperState.paused;
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if (!scraperState.paused) {
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this.state.pending = { startedAt: started, trigger, pausedByUs: true }; this.persist();
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await this.scraper.control('pause'); pausedByUs = true;
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}
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this.running.phase = 'waiting for the scraper to finish its current step';
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await this.waitIdle(scraperState);
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}
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// 2. Snapshot DATA into BACKUP/<name>.part, then rename.
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this.running.phase = 'writing archive';
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let stamp = started, name, file;
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do { name = `circus-${stampOf(new Date(stamp))}.tar.gz`; file = path.join(this.backupRoot, name); stamp += 1000; }
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while (fs.existsSync(file)); // two runs within one second must not overwrite each other
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part = file + '.part';
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const stats = await this.writeArchive(part);
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this.running.phase = 'verifying archive';
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const entries = await readArchive(part);
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const files = entries.filter(e => e.type === '0').length;
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if (files !== stats.files) throw new Error(`Verification read ${files} files, expected ${stats.files}`);
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await fsp.rename(part, file); part = null;
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Object.assign(result, { file: name, size: (await fsp.stat(file)).size, files, dataBytes: stats.bytes });
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} catch (e) {
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result.error = message(e);
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if (part) await fsp.rm(part, { force: true }).catch(() => {});
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} finally {
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// 3. Resume only what this run paused.
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if (pausedByUs) {
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this.running.phase = 'resuming queue';
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try { await this.resume(); result.queueResumed = true; }
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catch (e) { result.warnings.push(`Queue could not be resumed, resume it in Settings → Scraper: ${message(e)}`); }
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}
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if (this.state.pending) this.state.pending = null;
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}
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// 4. Retention only after a successful run, so failures never thin out old copies.
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if (!result.error) {
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this.running.phase = 'applying retention';
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try { result.deleted = await this.applyRetention(result.file); }
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catch (e) { result.warnings.push(`Retention failed: ${message(e)}`); }
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}
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result.durationMs = this.now() - started;
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await this.refreshTarget();
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this.record(result);
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if (result.error) this.log.error(`[backup] failed: ${result.error}`);
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else this.log.log(`[backup] ${result.file} ${result.size} bytes in ${result.durationMs} ms`);
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return result;
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}
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record(result) {
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this.state.last = result;
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this.state.history = [...this.state.history, result].slice(-10);
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this.persist();
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}
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async waitIdle(initial) {
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const deadline = this.now() + this.idleTimeoutMs;
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let state = initial, lastError = null;
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for (;;) {
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if (state && !(state.active || []).length && state.status !== 'pausing') return;
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if (this.now() >= deadline) {
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throw new Error(`The scraper did not become idle within ${Math.round(this.idleTimeoutMs / 60000)} min${lastError ? ` (${lastError})` : ''}; no backup written`);
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}
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await delay(this.pollMs);
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try { state = await this.scraper.state(); lastError = null; }
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catch (e) { state = null; lastError = message(e); }
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}
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}
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async resume() {
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let error;
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for (let attempt = 0; attempt < 3; attempt++) {
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try { await this.scraper.control('resume'); return; }
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catch (e) { error = e; if (attempt < 2) await delay(this.resumeRetryMs); }
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}
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throw error;
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}
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// Files of DATA in a stable order, skipping excluded names, symlinks and a nested BACKUP.
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async collect(dir = this.dataRoot, rel = '') {
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const out = [];
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const entries = (await fsp.readdir(dir, { withFileTypes: true })).sort((a, b) => (a.name < b.name ? -1 : a.name > b.name ? 1 : 0));
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for (const entry of entries) {
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const full = path.join(dir, entry.name), relative = rel ? rel + '/' + entry.name : entry.name;
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if (entry.isDirectory()) {
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if (full === this.backupRoot) continue;
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out.push({ full, relative, dir: true });
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out.push(...await this.collect(full, relative));
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} else if (entry.isFile() && !EXCLUDE.some(re => re.test(entry.name))) out.push({ full, relative, dir: false });
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}
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return out;
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}
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// Contents of one file as it goes into the archive.
|
||||
async contentOf(item) {
|
||||
if (item.relative === 'db.json' && this.snapshotDb) return Buffer.from(this.snapshotDb());
|
||||
if (item.relative === path.relative(this.dataRoot, this.stateFile).split(path.sep).join('/')) {
|
||||
const { pending, ...rest } = this.state; void pending;
|
||||
return Buffer.from(JSON.stringify(rest, null, 2) + '\n');
|
||||
}
|
||||
const data = await fsp.readFile(item.full);
|
||||
if (item.relative === 'scraper/queue.json') {
|
||||
const queue = JSON.parse(data.toString('utf8'));
|
||||
queue.paused = true; queue.status = 'paused';
|
||||
return Buffer.from(JSON.stringify(queue, null, 2) + '\n');
|
||||
}
|
||||
return data;
|
||||
}
|
||||
|
||||
async writeArchive(part) {
|
||||
const items = await this.collect(), stats = { files: 0, bytes: 0 };
|
||||
// The in-memory db is archived even before its first debounced write.
|
||||
if (this.snapshotDb && !items.some(item => item.relative === 'db.json')) items.unshift({ full: path.join(this.dataRoot, 'db.json'), relative: 'db.json', dir: false, memory: true });
|
||||
const manifest = { kind: 'mangacircus-data-backup', version: 1, created: new Date(this.now()).toISOString(),
|
||||
excluded: 'runtime*.json, *.lock, *.pid, *.tmp', queuePaused: true };
|
||||
const self = this;
|
||||
async function* tar() {
|
||||
yield* tarEntry('.circus-backup.json', Buffer.from(JSON.stringify(manifest, null, 2) + '\n'), { mtime: self.now() });
|
||||
for (const item of items) {
|
||||
let st;
|
||||
try { st = item.memory ? { mode: 0o644, uid: process.getuid?.() ?? 0, gid: process.getgid?.() ?? 0, mtimeMs: self.now() } : await fsp.stat(item.full); }
|
||||
catch (e) { if (e.code === 'ENOENT') continue; throw e; }
|
||||
const meta = { mode: st.mode, uid: st.uid, gid: st.gid, mtime: st.mtimeMs };
|
||||
if (item.dir) { yield* tarEntry(item.relative + '/', null, { ...meta, type: '5' }); continue; }
|
||||
let data;
|
||||
try { data = await self.contentOf(item); } catch (e) { if (e.code === 'ENOENT') continue; throw new Error(`${item.relative}: ${message(e)}`); }
|
||||
stats.files++; stats.bytes += data.length;
|
||||
yield* tarEntry(item.relative, data, meta);
|
||||
}
|
||||
yield Buffer.alloc(1024);
|
||||
}
|
||||
await pipeline(Readable.from(tar()), zlib.createGzip(), fs.createWriteStream(part, { flags: 'wx' }));
|
||||
const handle = await fsp.open(part, 'r+'); // fsync before the rename makes it visible
|
||||
try { await handle.sync(); } finally { await handle.close(); }
|
||||
stats.files++; // the manifest
|
||||
return stats;
|
||||
}
|
||||
|
||||
async removeStaleParts() {
|
||||
for (const name of await fsp.readdir(this.backupRoot)) if (PART.test(name)) await fsp.rm(path.join(this.backupRoot, name), { force: true });
|
||||
}
|
||||
|
||||
// Deletes only our own archive names directly inside BACKUP; never the newest one.
|
||||
async applyRetention(keepName) {
|
||||
const { mode, value } = this.state.settings.retention;
|
||||
const names = (await fsp.readdir(this.backupRoot)).filter(name => ARCHIVE.test(name)).sort();
|
||||
let doomed;
|
||||
if (mode === 'count') doomed = names.slice(0, Math.max(0, names.length - value));
|
||||
else { const cutoff = this.now() - value * 864e5; doomed = names.filter(name => archiveTime(name) < cutoff); }
|
||||
doomed = doomed.filter(name => name !== keepName && name !== names[names.length - 1]);
|
||||
for (const name of doomed) {
|
||||
const target = path.join(this.backupRoot, name);
|
||||
if (path.dirname(target) !== this.backupRoot) continue;
|
||||
await fsp.rm(target);
|
||||
}
|
||||
return doomed.length;
|
||||
}
|
||||
}
|
||||
|
||||
module.exports = { BackupService, BackupError, readArchive, validateSettings, nextOccurrence, DEFAULT_SETTINGS, ARCHIVE };
|
||||
Reference in new issue
Block a user