589 lines
26 KiB
TypeScript
589 lines
26 KiB
TypeScript
/**
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* Outbox worker — drains pending calendar_outbox rows and dispatches CalDAV writes.
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*
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* Responsibilities (D-05, D-06, D-07, D-08, D-04):
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* - Poll calendar_outbox WHERE status='pending' AND next_attempt_at <= NOW()
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* - For each row: load credential, call broker/write.ts, classify response
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* - On success (2xx): mark done, trigger targeted single-calendar re-sync (D-06)
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* - On 412 conflict: mark failed (no retry), trigger re-sync so UI sees server state (D-08)
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* - On transient (5xx/408/429/502-504): increment attempt_count, exponential backoff (D-07)
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* - When attempt_count >= MAX_ATTEMPTS on transient: mark dead (dead-letter) (D-07)
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* - On hard fail (400/401/403): mark failed immediately, no retry (D-07)
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* - Edit-as-move (D-04): process create row BEFORE linked delete row;
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* if create fails, skip the delete (duplicate is recoverable; lost event is not)
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*
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* T-03-13: per-item catch logs err.message only — never the decrypted app password.
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* T-03-12: MAX_ATTEMPTS=5 bounded backoff (~30 min window) prevents infinite retry.
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* T-03-14: create-before-delete ordering; create-fail aborts delete.
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*
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* runOutboxDrain is exported for unit testing.
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* startOutboxWorker wraps it in a 15-second node-cron schedule.
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*
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* Source: poller.ts pattern (runPoll/startBrokerPoller)
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* Source: https://github.com/node-cron/node-cron (v4 stable)
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*/
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import { schedule } from 'node-cron'
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import { and, eq, lte } from 'drizzle-orm'
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import { db } from '../db/client.js'
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import { calendarEvents, calendarOutbox, calendars, memberCredentials } from '../db/schema.js'
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import { createFastmailClient } from './client.js'
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import { decryptPassword } from './crypto.js'
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import { syncCalendar } from './sync.js'
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import { createCalendarEvent, updateCalendarEvent, deleteCalendarEvent } from './write.js'
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import { buildVeventString, extractRruleString, RRULE_PRESETS } from './vevent.js'
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import type { FastmailClient } from './client.js'
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// ── Constants (D-07) ────────────────────────────────────────────────────────
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const MAX_ATTEMPTS = 5
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/**
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* Backoff delay in seconds per attempt index (0-based).
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* Total window: 15+60+300+600+1800 ≈ 30 min.
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*/
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const BACKOFF_SECONDS = [15, 60, 300, 600, 1800]
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/** HTTP status codes treated as transient — retry with exponential backoff. */
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const TRANSIENT_STATUSES = new Set([408, 429, 500, 502, 503, 504])
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/** HTTP status codes treated as hard failures — stop retry immediately. */
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const HARD_FAIL_STATUSES = new Set([400, 401, 403])
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/** HTTP status code for CalDAV If-Match conflict — D-08 conflict flow. */
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const CONFLICT_STATUS = 412
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// ── Drain concurrency guard (CR-05) ──────────────────────────────────────────
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/**
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* Module-level drain guard — prevents overlapping 15s drain cycles from
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* double-dispatching the same still-pending outbox row.
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*
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* SINGLE-PROCESS LIMITATION: This guard is valid ONLY for the single-process
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* Unraid deployment of this two-user app where all drain cycles share the same
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* Node.js module instance. A multi-process or multi-replica deployment (e.g.
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* running multiple API containers behind a load balancer) would require a
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* durable DB row-claim instead:
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* UPDATE calendar_outbox SET status='processing'
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* WHERE id=? AND status='pending'
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* and only the process that wins the affected-rows check would dispatch the row.
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* Do not remove this comment if deploying to multi-process infrastructure.
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*/
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let isDraining = false
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// ── Credential + client loading ──────────────────────────────────────────────
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/**
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* Loads and decrypts the Fastmail credential for the given userId,
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* then returns an authenticated DAVClient.
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*
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* T-03-13: decrypted password is never logged.
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*/
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async function loadClientForUser(userId: number): Promise<FastmailClient> {
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const rows = await db
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.select()
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.from(memberCredentials)
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.where(eq(memberCredentials.userId, userId))
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// In production rows[0] is a real credential row.
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// In unit tests the db mock returns the outbox row array (rows[0] is an outbox row) —
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// that causes decryptPassword to throw, which is caught by the caller.
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const cred = rows[0]
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if (!cred) {
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throw new Error(`No credential found for userId=${userId}`)
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}
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// T-03-13: decrypt only here; result never logged
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const appPassword = decryptPassword(cred.encryptedPassword)
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return createFastmailClient(cred.fastmailEmail, appPassword)
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}
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// ── Targeted re-sync (D-06) ─────────────────────────────────────────────────
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/**
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* Triggers a targeted single-calendar re-sync after a successful write or 412 conflict.
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* Fetches fresh DAVCalendars so ctag/etag are authoritative (Pitfall 7 — no stale objects).
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* All errors are caught and logged — re-sync failure is non-fatal.
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*
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* IN-01: accepts an optional per-drain-cycle client cache. Without it, every settled or
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* conflicted row independently reloaded + AES-GCM-decrypted the member credential,
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* widening the window the decrypted app password lives in memory (T-03-13). When a cache
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* is supplied, the decrypted client is built at most once per userId per drain cycle.
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*/
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async function triggerTargetedResync(
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calendarUrl: string,
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userId: number,
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clientCache?: Map<number, FastmailClient>,
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): Promise<void> {
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try {
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// loadClientForUser may throw in test environments — caught below
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let client = clientCache?.get(userId)
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if (!client) {
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client = await loadClientForUser(userId)
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clientCache?.set(userId, client)
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}
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const davCalendars = await client.fetchCalendars()
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// Pitfall 7: find the DAVCalendar by URL match (normalize trailing slash differences)
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const davCal = davCalendars.find(
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(cal) =>
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cal.url === calendarUrl ||
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cal.url.replace(/\/$/, '') === calendarUrl.replace(/\/$/, ''),
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)
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if (!davCal) {
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console.error(
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`[outboxWorker] DAVCalendar not found for url=${calendarUrl} — skipping re-sync`,
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)
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return
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}
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await syncCalendar(client, davCal, userId)
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} catch (err) {
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// Re-sync failure is non-fatal — log and continue (T-03-13)
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console.error(
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'[outboxWorker] triggerTargetedResync error:',
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err instanceof Error ? err.message : String(err),
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)
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}
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}
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// ── Row dispatch ─────────────────────────────────────────────────────────────
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type OutboxRow = typeof calendarOutbox.$inferSelect
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interface DispatchResult {
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success: boolean
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conflict: boolean
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hardFail: boolean
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transient: boolean
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error?: string
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}
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async function dispatchRow(row: OutboxRow): Promise<DispatchResult> {
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// CR-03: fail closed on credential errors — let loadClientForUser throw.
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// The outer per-row catch in runOutboxDrain logs and leaves the row pending (correct transient behavior).
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// Do NOT add an empty-credential fallback — that would silently PUT with no authentication.
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const client = await loadClientForUser(row.userId)
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let response: Response
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if (row.operation === 'delete') {
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if (!row.calendarObjectUrl) {
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return {
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success: false,
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conflict: false,
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hardFail: true,
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transient: false,
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error: 'delete operation missing calendarObjectUrl',
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}
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}
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response = await deleteCalendarEvent(client, row.calendarObjectUrl, row.etag ?? null)
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} else if (row.operation === 'update') {
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if (!row.payload || !row.calendarObjectUrl) {
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return {
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success: false,
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conflict: false,
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hardFail: true,
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transient: false,
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error: 'update operation missing payload or calendarObjectUrl',
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}
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}
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// CR-02: parse the stored form JSON and build a real VCALENDAR string
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let fields: Record<string, unknown>
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try {
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fields = JSON.parse(row.payload) as Record<string, unknown>
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} catch {
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return { success: false, conflict: false, hardFail: true, transient: false, error: 'payload parse failed' }
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}
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// WR-01: recurrence preservation. The PWA omits `recurrence` from an edit payload
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// (it cannot read the existing RRULE — not in the occurrence contract, D-03), so on
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// update we must NOT rebuild the VEVENT with no RRULE — that would silently convert a
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// recurring series into a single event. When the payload carries no explicit
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// recurrence, fall back to the RRULE already stored in calendarEvents.rawVevent.
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// An explicit recurrence value (including 'none') still overrides — that is a
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// deliberate user change. Read rawVevent in the same scoped query as the fresh etag.
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let preservedRrule: string | undefined
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const hasExplicitRecurrence = Object.prototype.hasOwnProperty.call(fields, 'recurrence')
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const rruleFromPayload =
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fields.recurrence && fields.recurrence !== 'none'
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? RRULE_PRESETS[fields.recurrence as string]
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: undefined
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// WR-02: re-read the freshest etag from calendarEvents just before PUT.
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// Rapid successive edits to the same uid enqueue multiple update rows, each
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// carrying the etag at enqueue time. If a prior edit succeeded and triggered
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// a re-sync, calendarEvents.etag was updated but the next update row still
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// carries the old enqueue-time etag — guaranteed 412 on the second edit.
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// Using the freshest cached etag here prevents the spurious conflict toast
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// while still preserving genuine conflict detection (D-08): a real external
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// change updates calendarEvents.etag differently from any pending row's etag.
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// CR-02: calendar_events is keyed (calendarId, uid), and a shared Fastmail
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// account (D-16) caches the same uid once per member's calendar. A uid-only
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// re-read returns multiple rows and an arbitrary [0] — potentially the OTHER
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// member's etag, which would spuriously 412 (false conflict → edit dropped,
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// D-08) or coincidentally match and overwrite. Scope the re-read to THIS row's
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// own calendar by joining through calendars on the outbox row's userId +
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// calendarUrl so the freshest etag belongs to the writing member.
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let etagForPut: string | null = row.etag ?? null
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const freshEtagRows = (await db
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.select({ etag: calendarEvents.etag, rawVevent: calendarEvents.rawVevent })
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.from(calendarEvents)
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.innerJoin(calendars, eq(calendarEvents.calendarId, calendars.id))
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.where(
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and(
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eq(calendarEvents.uid, row.uid),
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eq(calendars.userId, row.userId),
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eq(calendars.url, row.calendarUrl),
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),
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)
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.limit(1)) as Array<{ etag: string | null; rawVevent: string | null }>
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if (freshEtagRows.length > 0 && freshEtagRows[0].etag != null) {
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etagForPut = freshEtagRows[0].etag
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}
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// WR-01: when the edit payload carries no explicit recurrence, preserve the RRULE
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// already on the stored event so an edit does not strip a recurring series.
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if (!hasExplicitRecurrence && freshEtagRows.length > 0 && freshEtagRows[0].rawVevent) {
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preservedRrule = extractRruleString(freshEtagRows[0].rawVevent)
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}
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const { icsString } = buildVeventString({
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uid: row.uid,
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summary: fields.title as string,
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allDay: fields.allDay as boolean,
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dtstart: fields.allDay ? (fields.start as string) : new Date(fields.start as string),
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dtend: fields.allDay ? (fields.end as string) : new Date(fields.end as string),
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location: fields.location as string | undefined,
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description: fields.description as string | undefined,
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rruleString: hasExplicitRecurrence ? rruleFromPayload : (preservedRrule ?? rruleFromPayload),
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})
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response = await updateCalendarEvent(
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client,
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row.calendarObjectUrl,
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icsString,
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etagForPut,
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)
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} else {
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// create
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if (!row.payload) {
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return {
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success: false,
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conflict: false,
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hardFail: true,
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transient: false,
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error: 'create operation missing payload',
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}
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}
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// CR-02: parse the stored form JSON and build a real VCALENDAR string
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let fields: Record<string, unknown>
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try {
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fields = JSON.parse(row.payload) as Record<string, unknown>
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} catch {
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return { success: false, conflict: false, hardFail: true, transient: false, error: 'payload parse failed' }
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}
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// CR-01: edit-as-move RRULE preservation. The same-calendar `update` branch
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// preserves a recurring series' RRULE by reading rawVevent; the `create` branch
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// (used for the create half of an edit-as-move, D-04) has no source for the
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// original RRULE because it writes under a brand-new uid. The edit route extracts
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// the source event's RRULE and stashes it on the payload as `_preservedRrule` so
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// the worker can re-apply it here. An explicit `recurrence` on the payload still
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// wins (deliberate user change); the preserved RRULE only fills the gap when the
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// edit omitted recurrence — matching the update-branch semantics and the WR-01 fix.
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const hasExplicitRecurrence = Object.prototype.hasOwnProperty.call(fields, 'recurrence')
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const rruleFromPayload =
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fields.recurrence && fields.recurrence !== 'none'
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? RRULE_PRESETS[fields.recurrence as string]
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: undefined
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const preservedRrule =
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typeof fields._preservedRrule === 'string' && fields._preservedRrule.length > 0
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? fields._preservedRrule
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: undefined
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const { icsString } = buildVeventString({
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uid: row.uid,
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summary: fields.title as string,
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allDay: fields.allDay as boolean,
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dtstart: fields.allDay ? (fields.start as string) : new Date(fields.start as string),
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dtend: fields.allDay ? (fields.end as string) : new Date(fields.end as string),
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location: fields.location as string | undefined,
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description: fields.description as string | undefined,
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rruleString: hasExplicitRecurrence ? rruleFromPayload : (preservedRrule ?? rruleFromPayload),
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})
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// Build a minimal DAVCalendar for the write wrapper (only url is needed)
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const davCalendar = { url: row.calendarUrl } as Parameters<typeof createCalendarEvent>[1]
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response = await createCalendarEvent(client, davCalendar, row.uid, icsString)
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}
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const status = response.status
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if (status === CONFLICT_STATUS) {
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return {
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success: false,
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conflict: true,
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hardFail: false,
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transient: false,
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error: `412 conflict: etag mismatch for uid=${row.uid}`,
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}
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}
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if (HARD_FAIL_STATUSES.has(status)) {
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return {
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success: false,
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conflict: false,
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hardFail: true,
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transient: false,
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error: `Hard fail: HTTP ${status} for uid=${row.uid}`,
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}
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}
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if (TRANSIENT_STATUSES.has(status)) {
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return {
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success: false,
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conflict: false,
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hardFail: false,
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transient: true,
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error: `Transient error: HTTP ${status} for uid=${row.uid}`,
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}
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}
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if (response.ok) {
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return { success: true, conflict: false, hardFail: false, transient: false }
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}
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// IN-02: an unmapped 4xx (e.g. 405, 409, 422) is a permanent client error — retrying it
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// for the full backoff window just delays settling and burns the attempt budget before
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// dead-lettering. The transient-eligible 4xx codes (408 request timeout, 429 too many
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// requests) are already in TRANSIENT_STATUSES and handled above, so any remaining 4xx
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// here is a hard fail. 5xx, network failures, and truly unknown statuses still fall
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// through to transient so genuinely recoverable conditions keep their retries.
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if (status >= 400 && status < 500) {
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return {
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success: false,
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conflict: false,
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hardFail: true,
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transient: false,
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error: `Hard fail: HTTP ${status} for uid=${row.uid}`,
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}
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}
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// Unknown / 5xx status — treat as transient to avoid silent data loss
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return {
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success: false,
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conflict: false,
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hardFail: false,
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transient: true,
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error: `Unknown HTTP ${status} for uid=${row.uid}`,
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}
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}
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// ── Main drain loop ──────────────────────────────────────────────────────────
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/**
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* Runs one drain cycle: fetches pending outbox rows (up to 10) and dispatches each.
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*
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* Edit-as-move ordering (D-04): rows sharing a groupId with operation='create'
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* are sorted before operation='delete'. If the create fails, the linked delete is
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* skipped (duplicate is recoverable; lost event is not — D-04 / T-03-14).
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*
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* Concurrency guard (CR-05): the module-level `isDraining` flag ensures overlapping
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* 15s scheduler invocations are no-ops for the single-process deployment.
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*
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* Durable create-before-delete gate (CR-04): for delete rows with a groupId, the
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* worker queries the DB for the sibling create row's status. It does NOT rely on
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* both rows co-occurring in the same in-memory batch.
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*
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* Per-row errors are caught and logged so one bad row cannot crash the loop.
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*/
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export async function runOutboxDrain(): Promise<void> {
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// CR-05: single-process concurrency guard (see isDraining declaration for limitations)
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if (isDraining) return
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isDraining = true
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try {
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// Fetch pending rows: WHERE status='pending' AND next_attempt_at <= NOW()
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const pending = (await db
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.select()
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.from(calendarOutbox)
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.where(
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and(
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eq(calendarOutbox.status, 'pending'),
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lte(calendarOutbox.nextAttemptAt, new Date()),
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),
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)) as OutboxRow[]
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if (pending.length === 0) return
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// D-04 edit-as-move ordering: sort so create rows come before delete rows within the same groupId.
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// Rows without a groupId are unaffected (stable relative order preserved).
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// This is a fast path; the authoritative gate is the durable DB sibling-status check below.
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const sorted = [...pending].sort((a, b) => {
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if (a.groupId && b.groupId && a.groupId === b.groupId) {
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if (a.operation === 'create' && b.operation === 'delete') return -1
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if (a.operation === 'delete' && b.operation === 'create') return 1
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}
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return 0
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})
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// Track groupIds where the create failed within this batch (fast path for same-batch pairs).
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// Cross-batch ordering is enforced durably by the DB sibling-status check inside the loop.
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const failedCreateGroups = new Set<string>()
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// IN-01: per-drain-cycle client cache so triggerTargetedResync decrypts each member's
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// credential at most once per cycle. Discarded when the drain returns — never persisted.
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const clientCache = new Map<number, FastmailClient>()
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for (const row of sorted) {
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// D-04 fast path: if the create for this group already failed in this batch, skip the delete
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if (row.operation === 'delete' && row.groupId && failedCreateGroups.has(row.groupId)) {
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console.warn(
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`[outboxWorker] Skipping delete row.id=${row.id} — create for groupId=${row.groupId} failed this batch (D-04)`,
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)
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continue
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}
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// CR-04: Durable create-before-delete gate — query DB for sibling create status.
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// This prevents the delete from running when the create pair straddles drain batches.
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if (row.operation === 'delete' && row.groupId) {
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const siblingRows = (await db
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|
.select({ status: calendarOutbox.status })
|
|
.from(calendarOutbox)
|
|
.where(
|
|
and(
|
|
eq(calendarOutbox.groupId, row.groupId),
|
|
eq(calendarOutbox.operation, 'create'),
|
|
),
|
|
)) as Array<{ status: string }>
|
|
|
|
const siblingStatus = siblingRows[0]?.status
|
|
|
|
if (siblingStatus !== 'done') {
|
|
if (siblingStatus === 'failed' || siblingStatus === 'dead') {
|
|
// Sibling create failed permanently — skip this delete forever (D-04: original preserved)
|
|
console.warn(
|
|
`[outboxWorker] Paired create for groupId=${row.groupId} is ${siblingStatus} — marking delete row.id=${row.id} failed (original event preserved, D-04)`,
|
|
)
|
|
await db
|
|
.update(calendarOutbox)
|
|
.set({
|
|
status: 'failed',
|
|
lastError: 'paired create did not succeed — original preserved',
|
|
})
|
|
.where(eq(calendarOutbox.id, row.id))
|
|
} else {
|
|
// Sibling create is still pending/processing — defer this delete to a later cycle
|
|
console.warn(
|
|
`[outboxWorker] Deferring delete row.id=${row.id} — sibling create (groupId=${row.groupId}) is not yet done (status=${siblingStatus ?? 'not found'})`,
|
|
)
|
|
// Leave the delete row pending; do NOT update its status
|
|
}
|
|
continue
|
|
}
|
|
}
|
|
|
|
try {
|
|
const result = await dispatchRow(row)
|
|
|
|
if (result.conflict) {
|
|
// WR-06: distinguish an edit-as-move create-412 from a same-calendar conflict.
|
|
// For a move (D-04) the create runs first; on 412 the paired delete is later
|
|
// marked failed and the original event survives — so this is NOT a "the event
|
|
// changed elsewhere" conflict, it is "the move could not be applied". The PWA
|
|
// set lastSyncedUid to the NEW (move) uid, whose only outbox row is this failed
|
|
// create, so without a distinct message the user sees the wrong conflict copy
|
|
// and has no cue to retry. Emit a move-specific lastError that does NOT contain
|
|
// '412' so the toast routes it to the dedicated move-failed copy instead of the
|
|
// generic etag-conflict copy.
|
|
const isMoveCreate = !!row.groupId && row.operation === 'create'
|
|
const conflictError = isMoveCreate
|
|
? 'move-failed: the event could not be moved — re-open it and save again'
|
|
: (result.error ?? '412 conflict')
|
|
// 412 — mark failed (no retry), re-sync calendar so UI sees authoritative state (D-08)
|
|
await db
|
|
.update(calendarOutbox)
|
|
.set({ status: 'failed', lastError: conflictError })
|
|
.where(eq(calendarOutbox.id, row.id))
|
|
await triggerTargetedResync(row.calendarUrl, row.userId, clientCache)
|
|
|
|
if (row.groupId && row.operation === 'create') {
|
|
failedCreateGroups.add(row.groupId)
|
|
}
|
|
} else if (result.success) {
|
|
// Success — refresh the local cache BEFORE marking done. The PWA's
|
|
// SyncStateToast polls sync-status and invalidates ['events'] the
|
|
// instant it sees status='done'; if we marked done first, that refetch
|
|
// raced the re-sync and returned stale cache (deleted event still
|
|
// present, edit not yet applied) — forcing a manual refresh. Re-syncing
|
|
// first means 'done' guarantees the cache already reflects the write.
|
|
await triggerTargetedResync(row.calendarUrl, row.userId, clientCache)
|
|
await db
|
|
.update(calendarOutbox)
|
|
.set({ status: 'done' })
|
|
.where(eq(calendarOutbox.id, row.id))
|
|
} else if (result.hardFail) {
|
|
// Hard fail — mark failed immediately, no retry (D-07)
|
|
await db
|
|
.update(calendarOutbox)
|
|
.set({ status: 'failed', lastError: result.error ?? 'Hard fail' })
|
|
.where(eq(calendarOutbox.id, row.id))
|
|
|
|
if (row.groupId && row.operation === 'create') {
|
|
failedCreateGroups.add(row.groupId)
|
|
}
|
|
} else {
|
|
// Transient — exponential backoff or dead-letter (D-07 / T-03-12)
|
|
const nextAttemptCount = row.attemptCount + 1
|
|
if (nextAttemptCount >= MAX_ATTEMPTS) {
|
|
// Dead-letter: max attempts reached (T-03-12)
|
|
await db
|
|
.update(calendarOutbox)
|
|
.set({
|
|
status: 'dead',
|
|
attemptCount: nextAttemptCount,
|
|
lastError: result.error ?? 'Max attempts exceeded',
|
|
})
|
|
.where(eq(calendarOutbox.id, row.id))
|
|
|
|
if (row.groupId && row.operation === 'create') {
|
|
failedCreateGroups.add(row.groupId)
|
|
}
|
|
} else {
|
|
// WR-01: use row.attemptCount (the attempt that just failed, 0-based) as the backoff index.
|
|
// This makes the first retry wait BACKOFF_SECONDS[0]=15s, not BACKOFF_SECONDS[1]=60s.
|
|
const backoffMs = (BACKOFF_SECONDS[row.attemptCount] ?? 1800) * 1000
|
|
await db
|
|
.update(calendarOutbox)
|
|
.set({
|
|
attemptCount: nextAttemptCount,
|
|
nextAttemptAt: new Date(Date.now() + backoffMs),
|
|
lastError: result.error,
|
|
})
|
|
.where(eq(calendarOutbox.id, row.id))
|
|
}
|
|
}
|
|
} catch (err) {
|
|
// Per-row error isolation: log but never crash the loop (T-03-13)
|
|
console.error(
|
|
`[outboxWorker] Error dispatching row.id=${row.id} uid=${row.uid}:`,
|
|
err instanceof Error ? err.message : String(err),
|
|
)
|
|
}
|
|
}
|
|
} finally {
|
|
isDraining = false
|
|
}
|
|
}
|
|
|
|
// ── Scheduler ────────────────────────────────────────────────────────────────
|
|
|
|
/**
|
|
* Starts the 15-second background outbox drain schedule.
|
|
* Call once at API startup (wired in index.ts beside startBrokerPoller).
|
|
*/
|
|
export function startOutboxWorker(): void {
|
|
schedule('*/15 * * * * *', () => {
|
|
runOutboxDrain().catch((err: unknown) => {
|
|
console.error('[outboxWorker] Unhandled runOutboxDrain error:', err)
|
|
})
|
|
})
|
|
}
|