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* @see frontend/docs/UX/layer-contracts/L1-data-layer.md §9.4
*
* IndexedDB-pohjainen outbox offline-mutaatioille.
* Tallentaa mutaatiot järjestyksessä, lähettää yhteyden palautuessa.
*
* Liittyy periaatteisiin: 5, 8
*/
import { get, set } from 'idb-keyval'
import type { QueryClient } from '@tanstack/react-query'
import { apiClient } from '@/lib/axios'
import { getOnlineDetector } from '@/lib/onlineDetector'
const OUTBOX_KEY = 'mutation-outbox'
type OutboxListener = () => void
const outboxListeners = new Set<OutboxListener>()
export function subscribeOutbox(listener: OutboxListener): () => void {
outboxListeners.add(listener)
return () => {
outboxListeners.delete(listener)
}
}
function notifyOutboxListeners(): void {
for (const listener of outboxListeners) {
listener()
}
}
export interface OutboxEntry {
id: string
entityPath: string
op: 'CREATE' | 'UPDATE' | 'DELETE'
payload: unknown
idempotencyKey: string
createdAt: number
attempts: number
lastError?: string
status: 'PENDING' | 'PROCESSING' | 'FAILED'
}
async function readOutbox(): Promise<OutboxEntry[]> {
const raw = await get<OutboxEntry[]>(OUTBOX_KEY)
return raw ?? []
}
async function writeOutbox(entries: OutboxEntry[]): Promise<void> {
await set(OUTBOX_KEY, entries)
notifyOutboxListeners()
}
export async function addToOutbox(
entry: Omit<OutboxEntry, 'attempts' | 'lastError' | 'status'>,
): Promise<void> {
const outbox = await readOutbox()
const existing = outbox.filter(
(e) =>
!(
e.entityPath === entry.entityPath &&
e.op === 'DELETE' &&
entry.op === 'CREATE'
),
)
existing.push({
...entry,
attempts: 0,
status: 'PENDING' as const,
})
await writeOutbox(existing)
}
export async function getOutboxEntries(
status?: OutboxEntry['status'],
): Promise<OutboxEntry[]> {
const outbox = await readOutbox()
if (!status) return outbox
return outbox.filter((e) => e.status === status)
}
export async function removeFromOutbox(id: string): Promise<void> {
const outbox = await readOutbox()
await writeOutbox(outbox.filter((e) => e.id !== id))
}
export async function updateOutboxEntry(
id: string,
updates: Partial<Pick<OutboxEntry, 'attempts' | 'lastError' | 'status'>>,
): Promise<void> {
const outbox = await readOutbox()
const idx = outbox.findIndex((e) => e.id === id)
Iif (idx === -1) return
outbox[idx] = { ...outbox[idx], ...updates }
await writeOutbox(outbox)
}
export async function getPendingDeleteEntriesFromOutbox(): Promise<
Array<{ entityPath: string; id: string }>
>I {
const outbox = await readOutbox()
return outbox
.filter((e) => e.op === 'DELETE' && e.status !== 'FAILED')
.map((e) => {
E const payload = e.payload as { id: string }
return { entityPath: e.entityPath, id: payload.id }
})
}
async function executeOutboxEntry(
entry: OutboxEntry,
): Promise<{ success: boolean; error?: string }> {
const headers: Record<string, string> = {
'Idempotency-Key': entry.idempotencyKey,
}
try {
const { entityPath, op, payload } = entry
switch (op) {
case 'CREATE':
await apiClient.post(entityPath, payload, { headers })
break
case 'UPDATE': {
const { id, ...body } = payload as { id: string; [key: string]: unknown }
await apiClient.put(`${entityPath}/${id}`, body, { headers })
break
}
case 'DELETE': {
const { id } = payload as { id: string }
await apiClient.delete(`${entityPath}/${id}`, { headers })
break
}
}
return { success: true }
} catch (err) {
const message =
err instanceof Error ? err.message : 'Unknown outbox replay error'
return { success: false, error: message }
}
}
export async function replayOutbox(
queryClient: QueryClient,
onDeleteReplaySuccess?: (entityPath: string, id: string) => void,
): Promise<{ failed: number; total: number }> {
Iif (!getOnlineDetector().isOnline()) return { failed: 0, total: 0 }
const outbox = await readOutbox()
if (outbox.length === 0) return { failed: 0, total: 0 }
const pending = outbox.filter(
(e) => e.status === 'PENDING' || e.status === 'FAILED',
)
Iif (pending.length === 0) return { failed: 0, total: 0 }
const hasPending = pending.some((e) => e.status === 'PENDING')
Iif (!hasPending) {
for (const entry of pending) {
await removeFromOutbox(entry.id)
}
return { failed: 0, total: pending.length }
}
let failed = 0
const touchedPaths = new Set<string>()
for (const entry of pending) {
await updateOutboxEntry(entry.id, { status: 'PROCESSING' })
const result = await executeOutboxEntry(entry)
touchedPaths.add(entry.entityPath)
if (result.success) {
await removeFromOutbox(entry.id)
if (entry.op === 'DELETE') {
const payload = entry.payload as { id: string }
onDeleteReplaySuccess?.(entry.entityPath, payload.id)
}
} else {
failed++
await updateOutboxEntry(entry.id, {
status: 'FAILED',
attempts: entry.attempts + 1,
lastError: result.error,
})
}
}
for (const path of touchedPaths) {
queryClient.invalidateQueries({ queryKey: [path] })
}
// Per-component SSE reconnect is handled by Phase 1 backoff/lost-retry timers (§9.5).
// No separate SSE coordinator is needed.
if (failed === 0) {
await queryClient.refetchQueries({ stale: true })
}
return { failed, total: pending.length }
}
export function startOutboxReplay(
queryClient: QueryClient,
onDeleteReplaySuccess?: (entityPath: string, id: string) => void,
): () => void {
replayOutbox(queryClient, onDeleteReplaySuccess)
const detector = getOnlineDetector()
async function onOnline() {
await replayOutbox(queryClient, onDeleteReplaySuccess)
}
const unsubscribe = detector.subscribe(() => {
if (detector.isOnline()) {
void onOnline()
}
})
return unsubscribe
} |