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Edge Functions

Scheduling Edge Functions

The hosted Supabase Platform supports the pg_cron extension, a recurring job scheduler in Postgres.

In combination with the pg_net extension, this allows us to invoke Edge Functions periodically on a set schedule.

Examples#

Invoke an Edge Function every minute#

Call the function with your secret key. Don't use your publishable key, because it's public and anyone who has it can call a function that accepts it. Store your project URL and secret key in Supabase Vault:

select vault.create_secret('https://project-ref.supabase.co', 'project_url');
select vault.create_secret('YOUR_SUPABASE_SECRET_KEY', 'secret_key');

Make a POST request to a Supabase Edge Function every minute:

select
  cron.schedule(
    'invoke-function-every-minute',
    '* * * * *', -- every minute
    $$
    select
      net.http_post(
          url:= (select decrypted_secret from vault.decrypted_secrets where name = 'project_url') || '/functions/v1/function-name',
          headers:=jsonb_build_object(
            'Content-type', 'application/json',
            'apikey', (select decrypted_secret from vault.decrypted_secrets where name = 'secret_key')
          ),
          body:=concat('{"time": "', now(), '"}')::jsonb
      ) as request_id;
    $$
  );

The function receives the secret key on the apikey header. To accept it, disable verify_jwt and use auth: 'secret'. For more information, see Service-to-service calls.

Resources#