feat(scheduler): add internal scheduler for self-hosted environments

apps/sim/instrumentation-node.ts

@@ -115,4 +115,12 @@ async function initializeOpenTelemetry() {
 
 export async function register() {
   await initializeOpenTelemetry()
+
+  // Initialize internal scheduler for self-hosted environments
+  try {
+    const { initializeInternalScheduler } = await import('./lib/scheduler/internal-scheduler')
+    initializeInternalScheduler()
+  } catch (error) {
+    logger.error('Failed to initialize internal scheduler', error)
+  }
 }

apps/sim/lib/core/config/env.ts

@@ -125,6 +125,8 @@ export const env = createEnv({
     TRIGGER_SECRET_KEY:                    z.string().min(1).optional(),           // Trigger.dev secret key for background jobs
     TRIGGER_DEV_ENABLED:                   z.boolean().optional(),                 // Toggle to enable/disable Trigger.dev for async jobs
     CRON_SECRET:                           z.string().optional(),                  // Secret for authenticating cron job requests
+    ENABLE_INTERNAL_SCHEDULER:             z.string().optional(),                  // Enable built-in scheduler for self-hosted environments
+    INTERNAL_SCHEDULER_INTERVAL_MS:        z.string().optional(),                  // Internal scheduler poll interval (default: 60000ms)
     JOB_RETENTION_DAYS:                    z.string().optional().default('1'),     // Days to retain job logs/data
 
     // Cloud Storage - AWS S3

apps/sim/lib/scheduler/internal-scheduler.test.ts

@@ -0,0 +1,91 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+vi.mock('@/lib/core/config/env', () => ({
+  env: {
+    ENABLE_INTERNAL_SCHEDULER: 'true',
+    CRON_SECRET: 'test-secret',
+    NEXT_PUBLIC_APP_URL: 'http://localhost:3000',
+    INTERNAL_SCHEDULER_INTERVAL_MS: '1000',
+  },
+}))
+
+vi.mock('@/lib/logs/console/logger', () => ({
+  createLogger: vi.fn().mockReturnValue({
+    info: vi.fn(),
+    error: vi.fn(),
+    warn: vi.fn(),
+    debug: vi.fn(),
+  }),
+}))
+
+const mockFetch = vi.fn()
+global.fetch = mockFetch
+
+describe('Internal Scheduler', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mockFetch.mockResolvedValue({
+      ok: true,
+      json: async () => ({ executedCount: 0 }),
+    })
+  })
+
+  afterEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('should poll schedules endpoint with correct authentication', async () => {
+    const { startInternalScheduler, stopInternalScheduler } = await import('./internal-scheduler')
+
+    startInternalScheduler()
+
+    // Wait for the initial poll to complete
+    await new Promise((resolve) => setTimeout(resolve, 100))
+
+    expect(mockFetch).toHaveBeenCalledWith(
+      'http://localhost:3000/api/schedules/execute',
+      expect.objectContaining({
+        method: 'GET',
+        headers: expect.objectContaining({
+          Authorization: 'Bearer test-secret',
+          'User-Agent': 'sim-studio-internal-scheduler/1.0',
+        }),
+      })
+    )
+
+    stopInternalScheduler()
+  })
+
+  it('should handle fetch errors gracefully', async () => {
+    mockFetch.mockRejectedValueOnce(new Error('Network error'))
+
+    const { startInternalScheduler, stopInternalScheduler } = await import('./internal-scheduler')
+
+    // Should not throw
+    startInternalScheduler()
+    await new Promise((resolve) => setTimeout(resolve, 100))
+    stopInternalScheduler()
+  })
+
+  it('should handle non-ok responses', async () => {
+    mockFetch.mockResolvedValueOnce({
+      ok: false,
+      status: 401,
+      text: async () => 'Unauthorized',
+    })
+
+    const { startInternalScheduler, stopInternalScheduler } = await import('./internal-scheduler')
+
+    // Should not throw
+    startInternalScheduler()
+    await new Promise((resolve) => setTimeout(resolve, 100))
+    stopInternalScheduler()
+  })
+})
+
+describe('shouldEnableInternalScheduler', () => {
+  it('should return true when ENABLE_INTERNAL_SCHEDULER is true', async () => {
+    const { shouldEnableInternalScheduler } = await import('./internal-scheduler')
+    expect(shouldEnableInternalScheduler()).toBe(true)
+  })
+})

apps/sim/lib/scheduler/internal-scheduler.ts

@@ -0,0 +1,134 @@
+/**
+ * Internal Scheduler for Self-Hosted Environments
+ *
+ * This module provides a built-in scheduler that periodically polls the
+ * /api/schedules/execute endpoint to trigger scheduled workflows.
+ * This is necessary for self-hosted environments that don't have access
+ * to external cron services like Vercel Cron Jobs.
+ *
+ * Enable by setting ENABLE_INTERNAL_SCHEDULER=true in your environment.
+ */
+
+import { env } from '@/lib/core/config/env'
+import { createLogger } from '@/lib/logs/console/logger'
+
+const logger = createLogger('InternalScheduler')
+
+const DEFAULT_POLL_INTERVAL_MS = 60000 // 1 minute
+
+let schedulerInterval: ReturnType<typeof setInterval> | null = null
+let isRunning = false
+
+/**
+ * Execute the schedule poll
+ */
+async function pollSchedules(): Promise<void> {
+  if (isRunning) {
+    logger.debug('Previous poll still running, skipping this cycle')
+    return
+  }
+
+  isRunning = true
+
+  try {
+    const appUrl = env.NEXT_PUBLIC_APP_URL || env.BETTER_AUTH_URL || 'http://localhost:3000'
+    const cronSecret = env.CRON_SECRET
+
+    if (!cronSecret) {
+      logger.warn('CRON_SECRET not configured, internal scheduler cannot authenticate')
+      return
+    }
+
+    const response = await fetch(`${appUrl}/api/schedules/execute`, {
+      method: 'GET',
+      headers: {
+        Authorization: `Bearer ${cronSecret}`,
+        'User-Agent': 'sim-studio-internal-scheduler/1.0',
+      },
+    })
+
+    if (!response.ok) {
+      const errorText = await response.text()
+      logger.error('Schedule poll failed', {
+        status: response.status,
+        error: errorText,
+      })
+      return
+    }
+
+    const result = await response.json()
+    if (result.executedCount > 0) {
+      logger.info(`Triggered ${result.executedCount} scheduled workflow(s)`)
+    }
+  } catch (error) {
+    logger.error('Error during schedule poll', error)
+  } finally {
+    isRunning = false
+  }
+}
+
+/**
+ * Start the internal scheduler
+ */
+export function startInternalScheduler(): void {
+  if (schedulerInterval) {
+    logger.warn('Internal scheduler already running')
+    return
+  }
+
+  const pollInterval = Number(env.INTERNAL_SCHEDULER_INTERVAL_MS) || DEFAULT_POLL_INTERVAL_MS
+
+  logger.info(`Starting internal scheduler with poll interval: ${pollInterval}ms`)
+
+  // Run immediately on start
+  void pollSchedules()
+
+  // Then run at regular intervals
+  schedulerInterval = setInterval(() => {
+    void pollSchedules()
+  }, pollInterval)
+}
+
+/**
+ * Stop the internal scheduler
+ */
+export function stopInternalScheduler(): void {
+  if (schedulerInterval) {
+    clearInterval(schedulerInterval)
+    schedulerInterval = null
+    logger.info('Internal scheduler stopped')
+  }
+}
+
+/**
+ * Check if the internal scheduler should be enabled
+ */
+export function shouldEnableInternalScheduler(): boolean {
+  return env.ENABLE_INTERNAL_SCHEDULER === 'true'
+}
+
+/**
+ * Initialize the internal scheduler if enabled
+ */
+export function initializeInternalScheduler(): void {
+  if (!shouldEnableInternalScheduler()) {
+    logger.debug('Internal scheduler disabled (set ENABLE_INTERNAL_SCHEDULER=true to enable)')
+    return
+  }
+
+  if (!env.CRON_SECRET) {
+    logger.warn('Cannot start internal scheduler: CRON_SECRET is not configured')
+    return
+  }
+
+  startInternalScheduler()
+
+  // Graceful shutdown handlers
+  process.on('SIGTERM', () => {
+    stopInternalScheduler()
+  })
+
+  process.on('SIGINT', () => {
+    stopInternalScheduler()
+  })
+}

docker-compose.prod.yml

@@ -20,6 +20,10 @@ services:
       - OLLAMA_URL=${OLLAMA_URL:-http://localhost:11434}
       - SOCKET_SERVER_URL=${SOCKET_SERVER_URL:-http://localhost:3002}
       - NEXT_PUBLIC_SOCKET_URL=${NEXT_PUBLIC_SOCKET_URL:-http://localhost:3002}
+      # Internal scheduler for self-hosted environments (enables scheduled workflows)
+      - ENABLE_INTERNAL_SCHEDULER=${ENABLE_INTERNAL_SCHEDULER:-true}
+      - CRON_SECRET=${CRON_SECRET:-default-cron-secret-change-me}
+      - INTERNAL_SCHEDULER_INTERVAL_MS=${INTERNAL_SCHEDULER_INTERVAL_MS:-60000}
     depends_on:
       db:
         condition: service_healthy

helm/sim/templates/networkpolicy.yaml

@@ -141,6 +141,10 @@ spec:
     ports:
     - protocol: TCP
       port: 443
+  # Allow custom egress rules
+  {{- with .Values.networkPolicy.egress }}
+  {{- toYaml . | nindent 2 }}
+  {{- end }}
 {{- end }}
 
 {{- if .Values.postgresql.enabled }}