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feat: add environment variable to disable auto-respawn of Edge Workers
Implement a simple check in SupabasePlatformAdapter to prevent spawning new edge functions during shutdown when EDGE_WORKER_DISABLE_AUTO_RESPAWN is set to true. Include documentation explaining how to disable auto-respawn via environment variables and outline use cases. Also, add a new test file to verify the environment variable behavior. This minimal change provides temporary control over worker respawning with minimal code modifications and documentation updates.
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‎pkgs/edge-worker/src/platform/SupabasePlatformAdapter.ts‎

Lines changed: 13 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -172,10 +172,21 @@ export class SupabasePlatformAdapter implements PlatformAdapter<SupabaseResource
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globalThis.onbeforeunload = async () => {
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this.logger.debug('Shutting down...');
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if (this.worker) {
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await this.spawnNewEdgeFunction();
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// Early return if no worker to respawn
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if (!this.worker) {
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await this.stopWorker();
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return;
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}
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// Check if auto-respawn is disabled
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if (this.validatedEnv.EDGE_WORKER_DISABLE_AUTO_RESPAWN === 'true') {
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this.logger.debug('Auto-respawn disabled via EDGE_WORKER_DISABLE_AUTO_RESPAWN');
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await this.stopWorker();
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return;
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}
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// Default behavior: spawn new function before stopping
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await this.spawnNewEdgeFunction();
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await this.stopWorker();
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};
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}

‎pkgs/edge-worker/tests/unit/autoRespawn.test.ts‎

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import { assertEquals } from 'https://deno.land/std@0.154.0/testing/asserts.ts';
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Deno.test('Auto-respawn environment variable', async (t) => {
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const originalEnv = { ...Deno.env.toObject() };
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// Mock required env vars for SupabasePlatformAdapter
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const mockEnv = {
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SUPABASE_URL: 'https://test.supabase.co',
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SUPABASE_ANON_KEY: 'test-anon-key',
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SUPABASE_SERVICE_ROLE_KEY: 'test-service-key',
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EDGE_WORKER_DB_URL: 'postgresql://test',
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SB_EXECUTION_ID: 'test-id'
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};
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const setupEnv = (extraEnv?: Record<string, string>) => {
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// Clear all env vars
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Object.keys(Deno.env.toObject()).forEach(key => {
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Deno.env.delete(key);
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});
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// Set mock env vars
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Object.entries({ ...mockEnv, ...extraEnv }).forEach(([key, value]) => {
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Deno.env.set(key, value);
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});
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};
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const restoreEnv = () => {
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// Restore original env
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Object.keys(Deno.env.toObject()).forEach(key => {
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Deno.env.delete(key);
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});
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Object.entries(originalEnv).forEach(([key, value]) => {
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if (value) Deno.env.set(key, value);
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});
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};
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await t.step('should spawn new function by default when EDGE_WORKER_DISABLE_AUTO_RESPAWN is not set', () => {
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setupEnv();
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// We can't easily test the actual spawn behavior without complex mocking
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// So we'll just verify the env var logic works
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const disableAutoRespawn = Deno.env.get('EDGE_WORKER_DISABLE_AUTO_RESPAWN') === 'true';
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assertEquals(disableAutoRespawn, false);
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restoreEnv();
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});
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await t.step('should spawn new function when EDGE_WORKER_DISABLE_AUTO_RESPAWN is false', () => {
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setupEnv({ EDGE_WORKER_DISABLE_AUTO_RESPAWN: 'false' });
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const disableAutoRespawn = Deno.env.get('EDGE_WORKER_DISABLE_AUTO_RESPAWN') === 'true';
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assertEquals(disableAutoRespawn, false);
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restoreEnv();
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});
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await t.step('should NOT spawn new function when EDGE_WORKER_DISABLE_AUTO_RESPAWN is true', () => {
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setupEnv({ EDGE_WORKER_DISABLE_AUTO_RESPAWN: 'true' });
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const disableAutoRespawn = Deno.env.get('EDGE_WORKER_DISABLE_AUTO_RESPAWN') === 'true';
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assertEquals(disableAutoRespawn, true);
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restoreEnv();
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});
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await t.step('should handle invalid env var values safely', () => {
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setupEnv({ EDGE_WORKER_DISABLE_AUTO_RESPAWN: 'invalid-value' });
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// Should default to spawning (false) since value is not exactly 'true'
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const disableAutoRespawn = Deno.env.get('EDGE_WORKER_DISABLE_AUTO_RESPAWN') === 'true';
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assertEquals(disableAutoRespawn, false);
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restoreEnv();
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});
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});

‎pkgs/website/src/content/docs/how-to/disable-worker-auto-respawn.mdx‎

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---
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title: Disable Worker Auto-Respawn
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description: How to disable automatic worker respawning in Supabase Edge Functions
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sidebar:
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order: 100
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---
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import { Aside } from "@astrojs/starlight/components";
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<Aside type="caution" title="Temporary Feature">
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This is a temporary solution using environment variables. In future versions, this may be replaced with a proper configuration option.
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</Aside>
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By default, pgflow Edge Workers automatically spawn a new instance when shutting down to ensure continuous processing. You can disable this behavior if you're using external orchestration like pg_cron.
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## Disabling Auto-Respawn
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Set the following environment variable in your Edge Function:
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```bash
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EDGE_WORKER_DISABLE_AUTO_RESPAWN=true
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```
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### In Supabase Dashboard
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1. Go to your project's Edge Functions settings
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2. Find your worker function
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3. Add the environment variable:
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- Key: `EDGE_WORKER_DISABLE_AUTO_RESPAWN`
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- Value: `true`
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### In .env.local
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For local development:
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```bash
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EDGE_WORKER_DISABLE_AUTO_RESPAWN=true
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```
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## When to Use This
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Disable auto-respawn when:
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- You're using pg_cron to schedule worker restarts
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- You want manual control over worker lifecycle
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- You're debugging shutdown behavior
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- You need to prevent duplicate workers
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## Example with pg_cron
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If you're using pg_cron to restart workers periodically:
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```sql
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-- Schedule worker restart every hour
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SELECT cron.schedule(
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'restart-edge-worker',
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'0 * * * *', -- Every hour
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$$
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-- Your restart logic here
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$$
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);
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```
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With auto-respawn disabled, only pg_cron controls when new workers start.
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<Aside type="note">
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Without auto-respawn, ensure you have another mechanism (like pg_cron) to restart workers, otherwise processing will stop when the worker shuts down.
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</Aside>

‎plan.md‎

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# Feature Plan: Disable Worker Auto-Respawning (Minimal MVP)
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## Overview
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Add a simple environment variable to disable the automatic respawning of Edge Workers when they shut down. This is a minimal, temporary solution that can be improved later based on user feedback.
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## Implementation (Super Simple)
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### 1. Code Change
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**File:** `pkgs/edge-worker/src/platform/SupabasePlatformAdapter.ts`
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In the `setupShutdownHandler()` method, check for env var:
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```typescript
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private setupShutdownHandler(): void {
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globalThis.onbeforeunload = async () => {
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this.logger.debug('Shutting down...');
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// Check if auto-respawn is disabled via env var
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const disableAutoRespawn = this.validatedEnv.EDGE_WORKER_DISABLE_AUTO_RESPAWN === 'true';
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if (this.worker && !disableAutoRespawn) {
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await this.spawnNewEdgeFunction();
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} else if (this.worker && disableAutoRespawn) {
26+
this.logger.debug('Auto-respawn disabled via EDGE_WORKER_DISABLE_AUTO_RESPAWN');
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}
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await this.stopWorker();
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};
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}
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```
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That's it for the code change! One if statement.
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### 2. Documentation
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**Create File:** `pkgs/website/src/content/docs/how-to/disable-worker-auto-respawn.mdx`
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```markdown
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---
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title: Disable Worker Auto-Respawn
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description: How to disable automatic worker respawning in Supabase Edge Functions
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sidebar:
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order: 100
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---
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import { Aside } from "@astrojs/starlight/components";
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<Aside type="caution" title="Temporary Feature">
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This is a temporary solution using environment variables. In future versions, this may be replaced with a proper configuration option.
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</Aside>
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By default, pgflow Edge Workers automatically spawn a new instance when shutting down to ensure continuous processing. You can disable this behavior if you're using external orchestration like pg_cron.
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## Disabling Auto-Respawn
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Set the following environment variable in your Edge Function:
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```bash
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EDGE_WORKER_DISABLE_AUTO_RESPAWN=true
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```
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### In Supabase Dashboard
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1. Go to your project's Edge Functions settings
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2. Find your worker function
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3. Add the environment variable:
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- Key: `EDGE_WORKER_DISABLE_AUTO_RESPAWN`
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- Value: `true`
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### In .env.local
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For local development:
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```bash
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EDGE_WORKER_DISABLE_AUTO_RESPAWN=true
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```
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## When to Use This
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Disable auto-respawn when:
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- You're using pg_cron to schedule worker restarts
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- You want manual control over worker lifecycle
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- You're debugging shutdown behavior
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- You need to prevent duplicate workers
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## Example with pg_cron
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If you're using pg_cron to restart workers periodically:
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```sql
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-- Schedule worker restart every hour
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SELECT cron.schedule(
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'restart-edge-worker',
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'0 * * * *', -- Every hour
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$$
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-- Your restart logic here
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$$
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);
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```
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With auto-respawn disabled, only pg_cron controls when new workers start.
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<Aside type="note">
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Without auto-respawn, ensure you have another mechanism (like pg_cron) to restart workers, otherwise processing will stop when the worker shuts down.
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</Aside>
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```
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### 3. Testing (Optional - Only if Easy)
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If testing is straightforward, create a simple test:
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**File:** `pkgs/edge-worker/tests/unit/autoRespawn.test.ts`
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```typescript
118+
describe('Auto-respawn environment variable', () => {
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it('should respect EDGE_WORKER_DISABLE_AUTO_RESPAWN env var', () => {
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// Mock env var
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// Verify spawnNewEdgeFunction is not called
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});
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});
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```
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## Implementation Checklist
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- [ ] Add env var check to SupabasePlatformAdapter.ts (~5 lines)
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- [ ] Create how-to documentation page
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- [ ] (Optional) Add simple test if easy
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## Total Effort: ~30 minutes
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This minimal approach:
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- Solves the immediate need
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- Requires minimal code changes (5-10 lines)
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- Easy to remove/replace later
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- No API changes
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- No breaking changes
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- Clear documentation about temporary nature

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