feat(federation): add outbox delivery, file queue download, and health check workers
This commit is contained in:
Jannis Braun
@@ -26,6 +26,7 @@ import { searchRoutes } from './routes/search.js';
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import { adminRoutes } from './routes/admin.js';
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import { gifRoutes } from './routes/gif.js';
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import { federationRoutes } from './routes/federation.js';
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import { startFederationWorkers, stopFederationWorkers } from './utils/federationWorker.js';
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import { registerWebSocket } from './ws/handler.js';
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import path from 'path';
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@@ -134,8 +135,12 @@ async function main(): Promise<void> {
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console.error('Media dimensions backfill failed (non-fatal):', err);
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});
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// Start federation background workers (outbox delivery, file download, health check)
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startFederationWorkers();
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const shutdown = async () => {
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console.log('Shutting down...');
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stopFederationWorkers();
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await app.close();
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process.exit(0);
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};
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@@ -0,0 +1,602 @@
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import { getDb } from '../db/index.js';
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import * as schema from '../db/schema.js';
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import { eq, and, lte, asc, inArray } from 'drizzle-orm';
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import { config } from '../config.js';
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import { isFederationRelayEnabled } from './federationOutbox.js';
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import { buildFederationHeaders } from './federationAuth.js';
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import { generateSnowflake } from './snowflake.js';
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import type { FederationRelayRequest, FederationRelayResponse, FederationRelayEvent } from '@backspace/shared';
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import fs from 'node:fs';
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import path from 'node:path';
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import crypto from 'node:crypto';
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import { pipeline } from 'node:stream/promises';
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import { Readable } from 'node:stream';
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// ─── Constants ──────────────────────────────────────────────────────────────
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const OUTBOX_INTERVAL_MS = 10_000; // 10 seconds
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const FILE_QUEUE_INTERVAL_MS = 30_000; // 30 seconds
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const HEALTH_CHECK_INTERVAL_MS = 3_600_000; // 1 hour
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const OUTBOX_BATCH_LIMIT = 50;
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const FILE_QUEUE_BATCH_LIMIT = 5;
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const OUTBOX_FETCH_TIMEOUT_MS = 30_000;
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const FILE_DOWNLOAD_TIMEOUT_MS = 60_000;
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const HEALTH_CHECK_TIMEOUT_MS = 10_000;
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/** Exponential backoff schedule by attempt number (1-indexed). Values in milliseconds. */
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const BACKOFF_SCHEDULE_MS: readonly number[] = [
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30_000, // attempt 1: 30s
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60_000, // attempt 2: 1min
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300_000, // attempt 3: 5min
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900_000, // attempt 4: 15min
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3_600_000, // attempt 5: 1hr
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21_600_000, // attempt 6: 6hr
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86_400_000, // attempt 7+: 24hr cap
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];
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const MAX_FILE_ATTEMPTS = 10;
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const PEER_UNREACHABLE_THRESHOLD = 10;
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// ─── Worker State ───────────────────────────────────────────────────────────
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let outboxTimer: ReturnType<typeof setTimeout> | null = null;
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let fileQueueTimer: ReturnType<typeof setTimeout> | null = null;
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let healthCheckTimer: ReturnType<typeof setTimeout> | null = null;
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let outboxAbortController: AbortController | null = null;
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let fileQueueAbortController: AbortController | null = null;
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let healthCheckAbortController: AbortController | null = null;
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// ─── Helpers ────────────────────────────────────────────────────────────────
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/**
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* Compute the backoff delay for a given attempt number (1-indexed).
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* Caps at the last entry in BACKOFF_SCHEDULE_MS.
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*/
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function getBackoffMs(attempt: number): number {
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const index = Math.min(attempt - 1, BACKOFF_SCHEDULE_MS.length - 1);
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return BACKOFF_SCHEDULE_MS[Math.max(0, index)] ?? 86_400_000;
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}
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/**
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* Build the origin URL for this instance.
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* Uses DOMAIN env var for production, falls back to localhost for dev.
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*/
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function getOurOrigin(): string {
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if (config.domain) {
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return `https://${config.domain}`;
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}
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return `http://localhost:${config.port}`;
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}
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/**
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* Get the effective max upload size from instance settings or config fallback.
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*/
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function getMaxUploadSize(): number {
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try {
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const db = getDb();
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const row = db
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.select({ maxUploadSizeBytes: schema.instanceSettings.maxUploadSizeBytes })
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.from(schema.instanceSettings)
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.where(eq(schema.instanceSettings.id, 1))
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.get();
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return row?.maxUploadSizeBytes ?? config.maxUploadSize;
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} catch {
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return config.maxUploadSize;
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}
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}
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// ─── Outbox Delivery Worker ─────────────────────────────────────────────────
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function scheduleOutboxTick(): void {
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outboxTimer = setTimeout(() => {
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processOutboxTick().catch((err) => {
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console.error('[federation-worker] Outbox tick error:', err);
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}).finally(() => {
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scheduleOutboxTick();
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});
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}, OUTBOX_INTERVAL_MS);
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}
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async function processOutboxTick(): Promise<void> {
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if (!isFederationRelayEnabled()) {
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return;
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}
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const db = getDb();
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const now = Date.now();
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// Fetch outbox entries ready for delivery, joined with active peers
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const entries = db
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.select({
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outboxId: schema.federationOutbox.id,
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peerId: schema.federationOutbox.peerId,
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dmChannelId: schema.federationOutbox.dmChannelId,
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messageId: schema.federationOutbox.messageId,
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eventType: schema.federationOutbox.eventType,
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payload: schema.federationOutbox.payload,
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encryptionVersion: schema.federationOutbox.encryptionVersion,
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attempts: schema.federationOutbox.attempts,
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createdAt: schema.federationOutbox.createdAt,
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peerOrigin: schema.federationPeers.origin,
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peerHmacSecret: schema.federationPeers.hmacSecret,
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peerStatus: schema.federationPeers.status,
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})
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.from(schema.federationOutbox)
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.innerJoin(
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schema.federationPeers,
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eq(schema.federationOutbox.peerId, schema.federationPeers.id),
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)
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.where(
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and(
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lte(schema.federationOutbox.nextRetryAt, now),
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eq(schema.federationPeers.status, 'active'),
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),
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)
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.orderBy(asc(schema.federationOutbox.createdAt))
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.limit(OUTBOX_BATCH_LIMIT)
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.all();
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if (entries.length === 0) {
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return;
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}
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// Group by peer
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const byPeer = new Map<string, typeof entries>();
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for (const entry of entries) {
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const group = byPeer.get(entry.peerId);
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if (group) {
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group.push(entry);
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} else {
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byPeer.set(entry.peerId, [entry]);
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}
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}
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const ourOrigin = getOurOrigin();
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for (const [peerId, peerEntries] of byPeer) {
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const firstEntry = peerEntries[0];
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if (!firstEntry) continue; // Should never happen given grouping logic above
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const peerOrigin = firstEntry.peerOrigin;
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const peerHmacSecret = firstEntry.peerHmacSecret;
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// Build relay events from outbox entries
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const events: FederationRelayEvent[] = peerEntries.map((entry) => {
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const parsed = JSON.parse(entry.payload) as Partial<FederationRelayEvent>;
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return {
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eventType: entry.eventType as FederationRelayEvent['eventType'],
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dmChannelId: entry.dmChannelId,
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messageId: entry.messageId,
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encryptionVersion: (entry.encryptionVersion ?? 0) as 0,
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timestamp: entry.createdAt,
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...(parsed.message ? { message: parsed.message } : {}),
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...(parsed.reactions ? { reactions: parsed.reactions } : {}),
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...(parsed.reaction ? { reaction: parsed.reaction } : {}),
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};
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});
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const request: FederationRelayRequest = {
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version: 1,
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sourceInstance: ourOrigin,
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events,
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};
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const bodyString = JSON.stringify(request);
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const headers = buildFederationHeaders(bodyString, peerHmacSecret, ourOrigin);
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// Create an abort controller for this specific request
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outboxAbortController = new AbortController();
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try {
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const response = await fetch(`${peerOrigin}/api/federation/relay`, {
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method: 'POST',
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headers,
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body: bodyString,
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signal: AbortSignal.any([
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outboxAbortController.signal,
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AbortSignal.timeout(OUTBOX_FETCH_TIMEOUT_MS),
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]),
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});
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if (response.ok) {
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const result = await response.json() as FederationRelayResponse;
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// Delete accepted entries
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if (result.accepted.length > 0) {
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// Map accepted messageIds to outbox IDs
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const acceptedSet = new Set(result.accepted);
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const acceptedOutboxIds = peerEntries
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.filter((e) => acceptedSet.has(e.messageId))
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.map((e) => e.outboxId);
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if (acceptedOutboxIds.length > 0) {
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db.delete(schema.federationOutbox)
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.where(inArray(schema.federationOutbox.id, acceptedOutboxIds))
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.run();
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}
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}
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// Log rejected entries (they remain in outbox for retry)
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for (const rejection of result.rejected) {
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console.warn(
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`[federation-worker] Peer ${peerOrigin} rejected message ${rejection.messageId}: ${rejection.reason}`,
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);
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}
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// Update peer health
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db.update(schema.federationPeers)
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.set({
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lastSeenAt: now,
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consecutiveFailures: 0,
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})
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.where(eq(schema.federationPeers.id, peerId))
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.run();
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} else {
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console.warn(
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`[federation-worker] Peer ${peerOrigin} returned HTTP ${response.status}`,
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);
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handleOutboxDeliveryFailure(db, peerId, peerEntries, now);
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}
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} catch (err) {
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if (err instanceof DOMException && err.name === 'AbortError') {
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// Worker is stopping — don't update anything
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return;
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}
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console.error(
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`[federation-worker] Failed to deliver to peer ${peerOrigin}:`,
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err instanceof Error ? err.message : err,
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);
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handleOutboxDeliveryFailure(db, peerId, peerEntries, now);
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}
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}
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}
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function handleOutboxDeliveryFailure(
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db: ReturnType<typeof getDb>,
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peerId: string,
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entries: Array<{ outboxId: string; attempts: number | null }>,
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now: number,
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): void {
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// Increment attempts and compute next retry for each entry
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for (const entry of entries) {
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const newAttempts = (entry.attempts ?? 0) + 1;
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const backoffMs = getBackoffMs(newAttempts);
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db.update(schema.federationOutbox)
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.set({
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attempts: newAttempts,
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nextRetryAt: now + backoffMs,
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})
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.where(eq(schema.federationOutbox.id, entry.outboxId))
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.run();
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}
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// Update peer failure tracking
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const peer = db
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.select({ consecutiveFailures: schema.federationPeers.consecutiveFailures })
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.from(schema.federationPeers)
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.where(eq(schema.federationPeers.id, peerId))
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.get();
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const newFailures = (peer?.consecutiveFailures ?? 0) + 1;
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const updates: Record<string, number | string> = {
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lastFailureAt: now,
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consecutiveFailures: newFailures,
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};
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if (newFailures >= PEER_UNREACHABLE_THRESHOLD) {
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(updates as Record<string, number | string>)['status'] = 'unreachable';
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console.warn(
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`[federation-worker] Peer ${peerId} marked unreachable after ${newFailures} consecutive failures`,
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);
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}
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db.update(schema.federationPeers)
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.set(updates)
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.where(eq(schema.federationPeers.id, peerId))
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.run();
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}
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// ─── File Queue Download Worker ─────────────────────────────────────────────
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function scheduleFileQueueTick(): void {
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fileQueueTimer = setTimeout(() => {
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processFileQueueTick().catch((err) => {
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console.error('[federation-worker] File queue tick error:', err);
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}).finally(() => {
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scheduleFileQueueTick();
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});
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}, FILE_QUEUE_INTERVAL_MS);
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}
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async function processFileQueueTick(): Promise<void> {
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if (!isFederationRelayEnabled()) {
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return;
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}
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const db = getDb();
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const now = Date.now();
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const pending = db
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.select()
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.from(schema.federationFileQueue)
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.where(
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and(
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eq(schema.federationFileQueue.status, 'pending'),
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lte(schema.federationFileQueue.nextRetryAt, now),
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),
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)
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.limit(FILE_QUEUE_BATCH_LIMIT)
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.all();
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if (pending.length === 0) {
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return;
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}
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const maxUploadSize = getMaxUploadSize();
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for (const entry of pending) {
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await processFileQueueEntry(db, entry, maxUploadSize, now);
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}
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}
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async function processFileQueueEntry(
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db: ReturnType<typeof getDb>,
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entry: typeof schema.federationFileQueue.$inferSelect,
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maxUploadSize: number,
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now: number,
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): Promise<void> {
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// SSRF protection: validate sourceUrl hostname matches peerOrigin hostname
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try {
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const sourceHostname = new URL(entry.sourceUrl).hostname;
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const peerHostname = new URL(entry.peerOrigin).hostname;
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if (sourceHostname !== peerHostname) {
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console.warn(
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`[federation-worker] SSRF blocked: sourceUrl hostname "${sourceHostname}" does not match peer origin "${peerHostname}" for file queue entry ${entry.id}`,
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);
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db.update(schema.federationFileQueue)
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.set({
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status: 'rejected',
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rejectionReason: 'ssrf_hostname_mismatch',
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})
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.where(eq(schema.federationFileQueue.id, entry.id))
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.run();
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return;
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}
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} catch {
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db.update(schema.federationFileQueue)
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.set({
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status: 'rejected',
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rejectionReason: 'invalid_url',
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})
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.where(eq(schema.federationFileQueue.id, entry.id))
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.run();
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return;
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}
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// Check file size against limit
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if (entry.size > maxUploadSize) {
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db.update(schema.federationFileQueue)
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.set({
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status: 'rejected',
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rejectionReason: 'size_limit_exceeded',
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})
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.where(eq(schema.federationFileQueue.id, entry.id))
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.run();
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return;
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}
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// Create abort controller for this download
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fileQueueAbortController = new AbortController();
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try {
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const response = await fetch(entry.sourceUrl, {
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signal: AbortSignal.any([
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fileQueueAbortController.signal,
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AbortSignal.timeout(FILE_DOWNLOAD_TIMEOUT_MS),
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]),
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});
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if (!response.ok || !response.body) {
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throw new Error(`HTTP ${response.status} downloading file from ${entry.sourceUrl}`);
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}
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// Generate a unique local filename using the same pattern as the upload route
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const ext = path.extname(entry.originalName) || '';
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const localId = generateSnowflake();
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const localFilename = `${localId}${ext}`;
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const localPath = path.join(config.uploadDir, localFilename);
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// Ensure upload directory exists
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fs.mkdirSync(config.uploadDir, { recursive: true });
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// Stream the response body to disk
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const nodeStream = Readable.fromWeb(response.body as ReadableStream);
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const writeStream = fs.createWriteStream(localPath);
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try {
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await pipeline(nodeStream, writeStream);
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} catch (pipeErr) {
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// Clean up partial file on failure
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try { fs.unlinkSync(localPath); } catch { /* ignore cleanup errors */ }
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throw pipeErr;
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}
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// Verify file was written and get actual size
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const stat = fs.statSync(localPath);
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// Check actual downloaded size against limit (defense in depth)
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if (stat.size > maxUploadSize) {
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try { fs.unlinkSync(localPath); } catch { /* ignore */ }
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db.update(schema.federationFileQueue)
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.set({
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status: 'rejected',
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rejectionReason: 'size_limit_exceeded',
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})
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.where(eq(schema.federationFileQueue.id, entry.id))
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.run();
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return;
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}
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// Create a local attachment record
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const attachmentId = generateSnowflake();
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db.insert(schema.attachments)
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.values({
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id: attachmentId,
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dmMessageId: entry.dmMessageId,
|
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uploaderId: null,
|
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filename: localFilename,
|
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originalName: entry.originalName,
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mimetype: entry.mimetype,
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size: stat.size,
|
||||
sourceUrl: entry.sourceUrl,
|
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createdAt: now,
|
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})
|
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.run();
|
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|
||||
// Mark file queue entry as completed
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db.update(schema.federationFileQueue)
|
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.set({
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status: 'completed',
|
||||
targetFilename: localFilename,
|
||||
})
|
||||
.where(eq(schema.federationFileQueue.id, entry.id))
|
||||
.run();
|
||||
|
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console.log(
|
||||
`[federation-worker] Downloaded federated file: ${entry.originalName} -> ${localFilename}`,
|
||||
);
|
||||
} catch (err) {
|
||||
if (err instanceof DOMException && err.name === 'AbortError') {
|
||||
// Worker is stopping — leave entry as pending for next tick
|
||||
return;
|
||||
}
|
||||
|
||||
console.error(
|
||||
`[federation-worker] Failed to download file ${entry.originalName} from ${entry.peerOrigin}:`,
|
||||
err instanceof Error ? err.message : err,
|
||||
);
|
||||
|
||||
const newAttempts = (entry.attempts ?? 0) + 1;
|
||||
|
||||
if (newAttempts > MAX_FILE_ATTEMPTS) {
|
||||
db.update(schema.federationFileQueue)
|
||||
.set({
|
||||
status: 'failed',
|
||||
attempts: newAttempts,
|
||||
rejectionReason: 'max_attempts_exceeded',
|
||||
})
|
||||
.where(eq(schema.federationFileQueue.id, entry.id))
|
||||
.run();
|
||||
} else {
|
||||
const backoffMs = getBackoffMs(newAttempts);
|
||||
db.update(schema.federationFileQueue)
|
||||
.set({
|
||||
attempts: newAttempts,
|
||||
nextRetryAt: now + backoffMs,
|
||||
})
|
||||
.where(eq(schema.federationFileQueue.id, entry.id))
|
||||
.run();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ─── Health Check Worker ────────────────────────────────────────────────────
|
||||
|
||||
function scheduleHealthCheckTick(): void {
|
||||
healthCheckTimer = setTimeout(() => {
|
||||
processHealthCheckTick().catch((err) => {
|
||||
console.error('[federation-worker] Health check tick error:', err);
|
||||
}).finally(() => {
|
||||
scheduleHealthCheckTick();
|
||||
});
|
||||
}, HEALTH_CHECK_INTERVAL_MS);
|
||||
}
|
||||
|
||||
async function processHealthCheckTick(): Promise<void> {
|
||||
const db = getDb();
|
||||
|
||||
const unreachablePeers = db
|
||||
.select()
|
||||
.from(schema.federationPeers)
|
||||
.where(eq(schema.federationPeers.status, 'unreachable'))
|
||||
.all();
|
||||
|
||||
if (unreachablePeers.length === 0) {
|
||||
return;
|
||||
}
|
||||
|
||||
const now = Date.now();
|
||||
|
||||
for (const peer of unreachablePeers) {
|
||||
healthCheckAbortController = new AbortController();
|
||||
|
||||
try {
|
||||
const response = await fetch(`${peer.origin}/api/instance/info`, {
|
||||
signal: AbortSignal.any([
|
||||
healthCheckAbortController.signal,
|
||||
AbortSignal.timeout(HEALTH_CHECK_TIMEOUT_MS),
|
||||
]),
|
||||
});
|
||||
|
||||
if (response.ok) {
|
||||
db.update(schema.federationPeers)
|
||||
.set({
|
||||
status: 'active',
|
||||
consecutiveFailures: 0,
|
||||
lastSeenAt: now,
|
||||
})
|
||||
.where(eq(schema.federationPeers.id, peer.id))
|
||||
.run();
|
||||
|
||||
console.log(
|
||||
`[federation-worker] Peer ${peer.origin} recovered — marked active`,
|
||||
);
|
||||
}
|
||||
// If not ok, leave as unreachable — will check again next cycle
|
||||
} catch (err) {
|
||||
if (err instanceof DOMException && err.name === 'AbortError') {
|
||||
return;
|
||||
}
|
||||
// Leave as unreachable — will check again next cycle
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ─── Lifecycle ──────────────────────────────────────────────────────────────
|
||||
|
||||
export function startFederationWorkers(): void {
|
||||
console.log('[federation-worker] Federation workers started');
|
||||
scheduleOutboxTick();
|
||||
scheduleFileQueueTick();
|
||||
scheduleHealthCheckTick();
|
||||
}
|
||||
|
||||
export function stopFederationWorkers(): void {
|
||||
if (outboxTimer) {
|
||||
clearTimeout(outboxTimer);
|
||||
outboxTimer = null;
|
||||
}
|
||||
if (fileQueueTimer) {
|
||||
clearTimeout(fileQueueTimer);
|
||||
fileQueueTimer = null;
|
||||
}
|
||||
if (healthCheckTimer) {
|
||||
clearTimeout(healthCheckTimer);
|
||||
healthCheckTimer = null;
|
||||
}
|
||||
|
||||
outboxAbortController?.abort();
|
||||
outboxAbortController = null;
|
||||
|
||||
fileQueueAbortController?.abort();
|
||||
fileQueueAbortController = null;
|
||||
|
||||
healthCheckAbortController?.abort();
|
||||
healthCheckAbortController = null;
|
||||
|
||||
console.log('[federation-worker] Federation workers stopped');
|
||||
}
|
||||
Reference in New Issue
Block a user