Cloudflare Developers•8mo ago

Can you call context.waitUntil() multiple times?

After handling a request, I have to save something to KV and make a fetch call to some other service. The order in which they execute does not matter. My code looks like this

async function handler(request, env, context) {
  /// generate response...

  context.waitUntil(saveResultToKV(stuff, env))
  context.waitUntil(callExternalService(env))

  return response;
}

async function handler(request, env, context) {
  /// generate response...

  context.waitUntil(saveResultToKV(stuff, env))
  context.waitUntil(callExternalService(env))

  return response;
}

Will the runtime wait for all the promises passed to context.waitUntil? Or will the runtime stop when the first promise resolves?

2 Replies

Chaika•8mo ago

Yes, you could also do waitUntil(Promise.all(...))

Arma•8mo ago

Whats the runtime behaviour when I'm calling waitUntil() twice? It does something like Promise.allSettled(...) internally ? Thanks! The docs should mention that it will wait for all of them to be settled, indeed

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Programming

Can you call context.waitUntil() multiple times?