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2x 2x 2x 3x 3x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import { createId } from '@paralleldrive/cuid2'
import { hostname } from 'os'
import { eq, asc, inArray, and, lt, or, isNull } from 'drizzle-orm'
import { db, schema } from '@/db'
import { getSocketIO } from '../socket-server'
import { createRedisClient, getRedisClient } from './redis'
import type {
TaskType,
TaskStatus,
BackgroundTask,
BackgroundTaskEvent,
} from '@/db/schema/background-tasks'
import type { TaskEventBase } from './tasks/events'
import type Redis from 'ioredis'
export type { TaskType, TaskStatus, BackgroundTask, BackgroundTaskEvent }
// ============================================================================
// Runner Identity & Constants
// ============================================================================
/**
* Unique identifier for this pod/process.
* K8s StatefulSets give predictable names: abaci-app-0, abaci-app-1, abaci-app-2
* Falls back to random ID for dev/testing
*/
const RUNNER_ID = process.env.HOSTNAME || hostname() || `runner-${createId()}`
/** How often to update task heartbeat (ms) */
const HEARTBEAT_INTERVAL_MS = 10_000 // 10 seconds
/** How long before a task is considered a zombie (ms) - 3 missed heartbeats */
const ZOMBIE_THRESHOLD_MS = 30_000 // 30 seconds
/** How often to sync cancelled tasks from DB (fallback for missed Redis messages) */
const DB_CANCELLATION_SYNC_INTERVAL_MS = 5_000 // 5 seconds
// ============================================================================
// Lifecycle Hooks
// ============================================================================
/**
* Hooks called at key points in a task's lifecycle.
* Register via `registerTaskHooks()` at app startup.
*/
export interface TaskLifecycleHooks {
onTaskCreated?(taskId: string, type: TaskType): void
onTaskCompleted?(taskId: string, type: TaskType): void
onTaskFailed?(taskId: string, type: TaskType, error: string): void
}
let lifecycleHooks: TaskLifecycleHooks = {}
/**
* Register lifecycle hooks for task events.
* Call once at app startup (e.g., in socket-server initialization).
*/
export function registerTaskHooks(hooks: TaskLifecycleHooks): void {
lifecycleHooks = hooks
}
// ============================================================================
// Task Timeouts
// ============================================================================
/** Default timeout per task type (ms). Override with `setTaskTimeout()`. */
const taskTimeouts: Partial<Record<TaskType, number>> = {
'worksheet-parse': 5 * 60 * 1000, // 5 minutes
'worksheet-reparse': 5 * 60 * 1000, // 5 minutes
'vision-training': 30 * 60 * 1000, // 30 minutes (training can be long)
'flowchart-embed': 5 * 60 * 1000, // 5 minutes
'flowchart-generate': 6 * 60 * 1000, // 6 minutes (LLM + validation)
'flowchart-refine': 6 * 60 * 1000, // 6 minutes (LLM + validation)
'seed-students': 10 * 60 * 1000, // 10 minutes (high-volume profiles are slow)
'audio-generate': 15 * 60 * 1000, // 15 minutes (many clips, external API)
'collected-clip-generate': 15 * 60 * 1000, // 15 minutes (many clips, external API)
'blog-image-generate': 5 * 60 * 1000, // 5 minutes (few blog hero images)
'image-generate': 15 * 60 * 1000, // 15 minutes (22 images, external API)
'phi-explore-generate': 30 * 60 * 1000, // 30 minutes (up to 27 images in pipeline mode)
'page-spot-generate': 5 * 60 * 1000, // 5 minutes (single image generation)
demo: 2 * 60 * 1000, // 2 minutes
'demo-refine': 10 * 60 * 1000, // 10 minutes (Claude Code can be slow)
'session-plan': 2 * 60 * 1000, // 2 minutes
'session-song': 7 * 60 * 1000, // 7 minutes (LLM prompt + ElevenLabs music generation)
'postcard-generate': 15 * 60 * 1000, // 15 minutes (orchestrator: up to 3 generate+review cycles + thumbnail)
'postcard-image-generate': 3 * 60 * 1000, // 3 minutes (single image generation)
'postcard-review': 2 * 60 * 1000, // 2 minutes (LLM vision review)
'postcard-thumbnail-generate': 3 * 60 * 1000, // 3 minutes (single thumbnail generation)
'moment-cull': 1 * 60 * 1000, // 1 minute (LLM classification of session moments)
}
const DEFAULT_TASK_TIMEOUT_MS = 5 * 60 * 1000 // 5 minutes
/** Active timeout timers, keyed by task ID */
const activeTimeouts = new Map<string, ReturnType<typeof setTimeout>>()
/** Get the timeout for a task type */
function getTaskTimeout(type: TaskType): number {
return taskTimeouts[type] ?? DEFAULT_TASK_TIMEOUT_MS
}
/** Clear an active timeout for a task */
function clearTaskTimeout(taskId: string): void {
const timer = activeTimeouts.get(taskId)
if (timer) {
clearTimeout(timer)
activeTimeouts.delete(taskId)
}
}
// ============================================================================
// Heartbeat Management
// ============================================================================
/** Active heartbeat timers, keyed by task ID */
const activeHeartbeats = new Map<string, ReturnType<typeof setInterval>>()
/** Start heartbeat timer for a task */
function startHeartbeat(taskId: string): void {
// Don't start duplicate heartbeats
if (activeHeartbeats.has(taskId)) return
const timer = setInterval(async () => {
try {
await db
.update(schema.backgroundTasks)
.set({ lastHeartbeat: new Date() })
.where(eq(schema.backgroundTasks.id, taskId))
} catch (err) {
console.error(`[TaskManager] Heartbeat failed for ${taskId}:`, err)
}
}, HEARTBEAT_INTERVAL_MS)
activeHeartbeats.set(taskId, timer)
}
/** Stop heartbeat timer for a task */
function stopHeartbeat(taskId: string): void {
const timer = activeHeartbeats.get(taskId)
if (timer) {
clearInterval(timer)
activeHeartbeats.delete(taskId)
}
}
// ============================================================================
// Redis Cancellation Pub/Sub
// ============================================================================
/** Dedicated Redis client for cancellation subscription */
let cancellationSubscriber: Redis | null = null
/** DB sync interval for cancellation fallback */
let dbSyncInterval: ReturnType<typeof setInterval> | null = null
/**
* Initialize Redis subscriber for cross-pod task cancellation.
* Call once at app startup.
*/
export function initCancellationSubscriber(): void {
const redis = createRedisClient()
if (!redis) {
console.log('[TaskManager] Redis unavailable, cancellation relies on DB sync only')
return
}
cancellationSubscriber = redis
redis.psubscribe('task:cancel:*').catch((err) => {
console.error('[TaskManager] Failed to subscribe to task cancellation channel:', err)
})
redis.on('pmessage', (_pattern, channel, _message) => {
const taskId = channel.replace('task:cancel:', '')
cancelledTasks.add(taskId)
console.log(`[TaskManager] Received cancellation for ${taskId} via Redis`)
})
console.log(`[TaskManager] Redis cancellation subscriber initialized (runner: ${RUNNER_ID})`)
}
/**
* Initialize DB sync fallback for cancellation.
* Catches cases where Redis messages are missed (network issues, late subscriber, etc.)
* Call once at app startup.
*/
export function initCancellationDbSync(): void {
dbSyncInterval = setInterval(async () => {
try {
const cancelledInDb = await db.query.backgroundTasks.findMany({
where: eq(schema.backgroundTasks.status, 'cancelled'),
columns: { id: true },
})
for (const task of cancelledInDb) {
cancelledTasks.add(task.id)
}
} catch (err) {
console.error('[TaskManager] DB cancellation sync failed:', err)
}
}, DB_CANCELLATION_SYNC_INTERVAL_MS)
console.log('[TaskManager] DB cancellation sync initialized')
}
/**
* Handle provided to task handlers for reporting progress and completion.
*
* @typeParam TOutput - The type of the task's completion output
* @typeParam TEvent - The discriminated union of domain events this task can emit.
* Must extend `TaskEventBase` (i.e., have a `type` field).
* See `src/lib/tasks/events.ts` for per-task event definitions.
*/
export interface TaskHandle<TOutput = unknown, TEvent extends TaskEventBase = TaskEventBase> {
/** The task ID */
id: string
/** Emit a domain event to all subscribers (persisted to DB for replay) */
emit(event: TEvent): void
/** Emit a transient domain event (Socket.IO only, NOT persisted to DB) */
emitTransient(event: TEvent): void
/** Update progress (0-100) with optional message. DB writes are throttled. */
setProgress(progress: number, message?: string): void
/** Mark task as completed with output */
complete(output: TOutput): void
/** Mark task as failed with error message */
fail(error: string): void
/** Check if task has been cancelled */
isCancelled(): boolean
}
/**
* Task state returned when subscribing to a task
*/
export interface TaskState<TOutput = unknown> {
id: string
type: TaskType
status: TaskStatus
progress: number
progressMessage: string | null
input: unknown
output: TOutput | null
error: string | null
createdAt: Date
startedAt: Date | null
completedAt: Date | null
userId: string | null
}
/**
* Lightweight task state for sending to clients via Socket.IO
* Omits the `input` field which can contain large data (e.g., base64 images)
*/
export interface TaskStateForClient<TOutput = unknown> {
id: string
type: TaskType
status: TaskStatus
progress: number
progressMessage: string | null
output: TOutput | null
error: string | null
createdAt: Date
startedAt: Date | null
completedAt: Date | null
}
/**
* Task event for replay
*/
export interface TaskEvent {
id: number
taskId: string
eventType: string
payload: unknown
createdAt: Date
replayed?: boolean
}
// Track cancelled tasks in-memory (for same-pod cancellation)
const cancelledTasks = new Set<string>()
/**
* Emit a task event to all subscribers
* @param persist - If true (default), persists to DB for replay. If false, Socket.IO only.
*/
async function emitTaskEvent(
taskId: string,
eventType: string,
payload: unknown,
persist = true
): Promise<void> {
const now = new Date()
// Persist event for replay (skip for transient events like streaming tokens)
if (persist) {
await db.insert(schema.backgroundTaskEvents).values({
taskId,
eventType,
payload: payload as any,
createdAt: now,
})
}
// Broadcast via Socket.IO
const io = getSocketIO()
if (io) {
io.to(`task:${taskId}`).emit('task:event', {
taskId,
eventType,
payload,
createdAt: now,
})
}
}
/** Throttle interval for progress DB writes (ms) */
const PROGRESS_DB_THROTTLE_MS = 3000
/** Track last DB write time per task for throttling */
const lastProgressDbWrite = new Map<string, number>()
/**
* Update task progress and broadcast to subscribers.
* DB writes are throttled to avoid hammering libsql during streaming.
* Socket.IO broadcasts happen on every call for real-time UI updates.
*/
async function updateProgress(taskId: string, progress: number, message?: string): Promise<void> {
const now = Date.now()
const lastWrite = lastProgressDbWrite.get(taskId) ?? 0
const shouldPersist = now - lastWrite >= PROGRESS_DB_THROTTLE_MS || progress >= 100
if (shouldPersist) {
lastProgressDbWrite.set(taskId, now)
await db
.update(schema.backgroundTasks)
.set({
progress,
progressMessage: message ?? null,
})
.where(eq(schema.backgroundTasks.id, taskId))
}
// Always broadcast to Socket.IO for real-time UI, but don't persist every progress event
await emitTaskEvent(taskId, 'progress', { progress, message }, shouldPersist)
}
/**
* Complete a task with output
*/
async function completeTask<TOutput>(
taskId: string,
output: TOutput,
type?: TaskType
): Promise<void> {
clearTaskTimeout(taskId)
const now = new Date()
await db
.update(schema.backgroundTasks)
.set({
status: 'completed',
output: output as any,
progress: 100,
completedAt: now,
})
.where(eq(schema.backgroundTasks.id, taskId))
await emitTaskEvent(taskId, 'completed', { output })
if (type) {
try {
lifecycleHooks.onTaskCompleted?.(taskId, type)
} catch (err) {
console.error(`[TaskManager] Lifecycle hook onTaskCompleted error:`, err)
}
}
}
/**
* Fail a task with error message
*/
async function failTask(taskId: string, error: string, type?: TaskType): Promise<void> {
clearTaskTimeout(taskId)
const now = new Date()
await db
.update(schema.backgroundTasks)
.set({
status: 'failed',
error,
completedAt: now,
})
.where(eq(schema.backgroundTasks.id, taskId))
await emitTaskEvent(taskId, 'failed', { error })
if (type) {
try {
lifecycleHooks.onTaskFailed?.(taskId, type, error)
} catch (err) {
console.error(`[TaskManager] Lifecycle hook onTaskFailed error:`, err)
}
}
}
/**
* Cancel a task
*/
export async function cancelTask(taskId: string): Promise<boolean> {
const task = await db.query.backgroundTasks.findFirst({
where: eq(schema.backgroundTasks.id, taskId),
})
if (!task) return false
if (task.status !== 'pending' && task.status !== 'running') return false
clearTaskTimeout(taskId)
stopHeartbeat(taskId)
// Mark as cancelled in memory for same-pod handler check
cancelledTasks.add(taskId)
// Publish to Redis for cross-pod cancellation
const redis = getRedisClient()
if (redis) {
try {
await redis.publish(`task:cancel:${taskId}`, 'cancelled')
} catch (err) {
console.error(`[TaskManager] Failed to publish cancellation to Redis:`, err)
// Continue anyway - DB update will be picked up by sync
}
}
const now = new Date()
await db
.update(schema.backgroundTasks)
.set({
status: 'cancelled',
completedAt: now,
})
.where(eq(schema.backgroundTasks.id, taskId))
await emitTaskEvent(taskId, 'cancelled', {})
return true
}
/**
* Get task state by ID
*/
export async function getTaskState(taskId: string): Promise<TaskState | null> {
const task = await db.query.backgroundTasks.findFirst({
where: eq(schema.backgroundTasks.id, taskId),
})
if (!task) return null
return {
id: task.id,
type: task.type as TaskType,
status: task.status as TaskStatus,
progress: task.progress ?? 0,
progressMessage: task.progressMessage,
input: task.input,
output: task.output,
error: task.error,
createdAt: task.createdAt,
startedAt: task.startedAt,
completedAt: task.completedAt,
userId: task.userId,
}
}
/**
* Get lightweight task state for sending to clients via Socket.IO
* Omits the `input` field which can contain large data (e.g., base64 images)
*/
export async function getTaskStateForClient(taskId: string): Promise<TaskStateForClient | null> {
const task = await db.query.backgroundTasks.findFirst({
where: eq(schema.backgroundTasks.id, taskId),
})
if (!task) return null
return {
id: task.id,
type: task.type as TaskType,
status: task.status as TaskStatus,
progress: task.progress ?? 0,
progressMessage: task.progressMessage,
output: task.output,
error: task.error,
createdAt: task.createdAt,
startedAt: task.startedAt,
completedAt: task.completedAt,
}
}
/**
* Get all events for a task (for replay)
*/
export async function getTaskEvents(taskId: string): Promise<TaskEvent[]> {
const events = await db.query.backgroundTaskEvents.findMany({
where: eq(schema.backgroundTaskEvents.taskId, taskId),
orderBy: [asc(schema.backgroundTaskEvents.id)],
})
return events.map((event) => ({
id: event.id,
taskId: event.taskId,
eventType: event.eventType,
payload: event.payload,
createdAt: event.createdAt,
}))
}
/**
* Create and start a background task
*
* @param type - The type of task (for routing to correct handler)
* @param input - Input data for the task
* @param handler - Async function that performs the work
* @param userId - Optional user ID to associate with task
* @returns The task ID
*
* @example
* ```typescript
* const taskId = await createTask<DemoInput, DemoOutput, DemoTaskEvent>(
* 'demo',
* { duration: 10 },
* async (handle, input) => {
* for (let i = 1; i <= 10; i++) {
* await sleep(input.duration * 100)
* handle.setProgress(i * 10, `Step ${i}/10`)
* handle.emit({ type: 'log', step: i, timestamp: new Date().toISOString() })
* }
* handle.complete({ message: 'Done!' })
* }
* )
* ```
*/
export async function createTask<TInput, TOutput, TEvent extends TaskEventBase = TaskEventBase>(
type: TaskType,
input: TInput,
handler: (handle: TaskHandle<TOutput, TEvent>, input: TInput) => Promise<void>,
userId?: string
): Promise<string> {
const id = createId()
const now = new Date()
// Persist task with runner ID
await db.insert(schema.backgroundTasks).values({
id,
type,
status: 'pending',
input: input as any,
createdAt: now,
userId: userId ?? null,
runnerId: RUNNER_ID,
})
// Create handle for the handler
const handle: TaskHandle<TOutput, TEvent> = {
id,
emit: (event) => {
// Destructure the typed event: `type` becomes the eventType, rest is the payload
const { type: eventType, ...payload } = event
// Fire and forget - don't block the handler (persisted to DB)
void emitTaskEvent(id, eventType, payload, true)
},
emitTransient: (event) => {
const { type: eventType, ...payload } = event
// Fire and forget - Socket.IO only, no DB write
void emitTaskEvent(id, eventType, payload, false)
},
setProgress: (progress, message) => {
void updateProgress(id, progress, message)
},
complete: (output) => {
void completeTask(id, output, type)
},
fail: (error) => {
void failTask(id, error, type)
},
isCancelled: () => cancelledTasks.has(id),
}
// Start task asynchronously (don't block the return)
console.log(`[TaskManager] Task ${id} (${type}) created`)
try {
lifecycleHooks.onTaskCreated?.(id, type)
} catch (err) {
console.error(`[TaskManager] Lifecycle hook onTaskCreated error:`, err)
}
setImmediate(async () => {
// Check if already cancelled before we start
if (cancelledTasks.has(id)) {
console.log(`[TaskManager] Task ${id} cancelled before start`)
return
}
// Update status to running with initial heartbeat
const startTime = new Date()
await db
.update(schema.backgroundTasks)
.set({
status: 'running',
startedAt: startTime,
lastHeartbeat: startTime,
})
.where(eq(schema.backgroundTasks.id, id))
await emitTaskEvent(id, 'started', {})
// Start heartbeat timer
startHeartbeat(id)
// Start timeout timer
const timeoutMs = getTaskTimeout(type)
const timer = setTimeout(async () => {
const task = await db.query.backgroundTasks.findFirst({
where: eq(schema.backgroundTasks.id, id),
})
if (task && task.status === 'running') {
console.error(`[TaskManager] Task ${id} (${type}) timed out after ${timeoutMs / 1000}s`)
await failTask(id, `Task timed out after ${timeoutMs / 1000}s`, type)
}
}, timeoutMs)
activeTimeouts.set(id, timer)
try {
await handler(handle, input)
console.log(`[TaskManager] Task ${id} completed`)
} catch (err) {
console.error(`[TaskManager] Task ${id} failed:`, err)
// Don't fail if already completed/failed/cancelled
const task = await db.query.backgroundTasks.findFirst({
where: eq(schema.backgroundTasks.id, id),
})
if (task && task.status === 'running') {
await failTask(id, err instanceof Error ? err.message : String(err), type)
}
} finally {
// Clean up tracking state
clearTaskTimeout(id)
stopHeartbeat(id)
cancelledTasks.delete(id)
lastProgressDbWrite.delete(id)
}
})
return id
}
// ============================================================================
// Zombie Task Cleanup
// ============================================================================
/**
* Mark zombie tasks as failed - pod-aware version.
*
* This should be called on server startup. It only cleans up tasks that:
* 1. Belong to this runner (we crashed and restarted)
* 2. Have no runner assigned (legacy or orphaned)
* 3. Have stale heartbeats (runner died without cleanup)
*
* Tasks with recent heartbeats and different runner IDs are left alone -
* they're running on other pods.
*
* @returns Number of zombie tasks cleaned up
*/
export async function cleanupZombieTasks(): Promise<number> {
const now = new Date()
const staleThreshold = new Date(now.getTime() - ZOMBIE_THRESHOLD_MS)
const potentialZombies = await db.query.backgroundTasks.findMany({
where: inArray(schema.backgroundTasks.status, ['running', 'pending']),
})
if (potentialZombies.length === 0) {
return 0
}
console.log(
`[TaskManager] Found ${potentialZombies.length} running/pending task(s), checking for zombies (runner: ${RUNNER_ID})...`
)
let cleaned = 0
for (const task of potentialZombies) {
const isOurTask = task.runnerId === RUNNER_ID
const hasNoRunner = !task.runnerId // Legacy task or never started
const isStale = task.lastHeartbeat && task.lastHeartbeat < staleThreshold
// Only clean up if:
// 1. It's our own task (we crashed and restarted)
// 2. It has no runner ID (legacy or orphaned)
// 3. Heartbeat is stale (runner died)
if (isOurTask || hasNoRunner || isStale) {
const reason = isOurTask
? 'Task interrupted by runner restart'
: hasNoRunner
? 'Task had no runner assigned'
: `Runner heartbeat stale (last: ${task.lastHeartbeat?.toISOString()})`
await failTask(task.id, reason, task.type as TaskType)
console.log(`[TaskManager] Cleaned zombie ${task.id} (${task.type}): ${reason}`)
cleaned++
} else {
console.log(
`[TaskManager] Skipping task ${task.id} - running on ${task.runnerId} with recent heartbeat`
)
}
}
return cleaned
}
/**
* Get tasks for a user
*/
export async function getUserTasks(userId: string, limit = 20): Promise<TaskState[]> {
const tasks = await db.query.backgroundTasks.findMany({
where: eq(schema.backgroundTasks.userId, userId),
orderBy: [asc(schema.backgroundTasks.createdAt)],
limit,
})
return tasks.map((task) => ({
id: task.id,
type: task.type as TaskType,
status: task.status as TaskStatus,
progress: task.progress ?? 0,
progressMessage: task.progressMessage,
input: task.input,
output: task.output,
error: task.error,
createdAt: task.createdAt,
startedAt: task.startedAt,
completedAt: task.completedAt,
userId: task.userId,
}))
}
/**
* Poll a task until it reaches a terminal state (completed, failed, or cancelled).
*
* @param taskId - The task ID to wait for
* @param timeout - Maximum time to wait in ms (default 5 minutes)
* @returns The final TaskState when completed
* @throws If the task is not found, fails, is cancelled, or times out
*/
export async function awaitTask<TOutput = unknown>(
taskId: string,
timeout = 5 * 60 * 1000
): Promise<TaskState<TOutput>> {
const start = Date.now()
while (Date.now() - start < timeout) {
const state = await getTaskState(taskId)
if (!state) throw new Error(`Task ${taskId} not found`)
if (state.status === 'completed') return state as TaskState<TOutput>
if (state.status === 'failed') throw new Error(`Task ${taskId} failed: ${state.error}`)
if (state.status === 'cancelled') throw new Error(`Task ${taskId} was cancelled`)
await new Promise((r) => setTimeout(r, 250))
}
throw new Error(`Task ${taskId} timed out after ${timeout}ms`)
}
/**
* Create a child task linked to a parent task.
* Thin wrapper around `createTask` that sets the `parentTaskId` relationship.
*
* @param parentTaskId - The parent task ID
* @param type - The type of task
* @param input - Input data for the task
* @param handler - Async function that performs the work
* @param userId - Optional user ID to associate with task
* @returns The child task ID
*/
export async function createChildTask<
TInput,
TOutput,
TEvent extends TaskEventBase = TaskEventBase,
>(
parentTaskId: string,
type: TaskType,
input: TInput,
handler: (handle: TaskHandle<TOutput, TEvent>, input: TInput) => Promise<void>,
userId?: string
): Promise<string> {
const childId = await createTask(type, input, handler, userId)
// Set parent relationship
await db
.update(schema.backgroundTasks)
.set({ parentTaskId })
.where(eq(schema.backgroundTasks.id, childId))
return childId
}
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