In typescript, how can I say "Don't create resource X until 15 seconds after the IAM Role it depends on finishes provisioning?"

Are you getting an error because the role isn't ready yet? How are you passing the role to resource X?

doing something in an

.apply

will wait until the IAM role is finished, so you can do something like this:

iamRole.arn.apply(async (arn) => {
            console.log("waiting for IAM role to be ready")
            await new Promise(resolve => setTimeout(resolve, 120000));
            return arn;
}),

It's an implicit dependency, like:

new aws.sns.TopicSubscription('firehose_sub', {
  topic: snsTopic.arn,
  protocol: 'firehose',
  endpoint: firehoseStream.arn,
  subscriptionRoleArn: snsRole.role.arn,
});

where

snsRole

is a module that creates an

aws.iam.Role

. I'll go with the promise route, thank you!

why is the role implicit? if you're passing an output from

snsRole.role.arn

to the Topic, it should be done in a dependent chain

Yea I'm surprised, I would expect that to just work without any funny business. That's not your experience, though?

It is done in a dependent chain, but sometimes IAM Roles aren't immediately usable after their creation. This is pretty common in Terraform: https://github.com/terraform-aws-modules/terraform-aws-autoscaling/blob/d4b7da041ef781604726953234b5bcd494cc5908/examples/complete/main.tf#L100-L103 When I delete and then recreate this module over and over, the IAM Role is not ready yet about 2/3rds of the time. And then a

pulumi up

right after creates it

So what if you pass something like

dependsOn: policyResource

to the TopicSubscription resource? That way it doesn't get created until the policies are provisioned.

The Role should already be dependent on the policy because the policy arn is in the Role

managedPolicyArns

Ok, I'm confused about the order of operations. Your last message gave me the impression that you were: 1. Creating a role 2. Adding a policy to it (maybe via policy attachment) 3. Passing the role to TopicSubscription And there was a race condition between 2 & 3, because since TopicSubscription is not explicitly dependent on the policy attachment in 2, it doesn't wait for it. I haven't seen

managedPolicyArns

in any code that you have shared.

repro package: https://gist.github.com/dmattia/7ac415f36ead6599aa7b39096f4037f8 Error on my first time trying to run it:

Ok so I was half correct. In your code, the order of operations is not as I interpreted - because you are creating the policy first. But

managedPolicyArns

functions in the way that I interpreted, meaning that when AWS receives values in that property it is actually creating additional resources in the form of PolicyAttachments for each of those ARNs, and since pulumi is not managing those policy attachments it does not know to wait for them. If you instead allow pulumi to manage that PolicyAttachment, than I suspect you would eliminate this race condition. Try something like this instead:

const snsPolicy = new aws.iam.Policy(`sns_policy`, {
  name: 'raceConditionPolicySns',
  path: '/',
  policy: {
    Version: '2012-10-17',
    Statement: [
      {
        Effect: 'Allow',
        Action: [
          'firehose:DescribeDeliveryStream',
          'firehose:ListDeliveryStreams',
          'firehose:ListTagsForDeliveryStream',
          'firehose:PutRecord',
          'firehose:PutRecordBatch',
        ],
        Resource: [firehoseStream.arn],
      },
    ],
  },
});

const snsRole = new aws.iam.Role(`sns_role`, {
  name: 'raceConditionRoleSns',
  assumeRolePolicy: {
    Version: '2012-10-17',
    Statement: [
      {
        Effect: 'Allow',
        Action: 'sts:AssumeRole',
        Principal: {
          Service: '<http://sns.amazonaws.com|sns.amazonaws.com>',
        },
      },
    ],
  },
});

var policyAttachment = new aws.iam.RolePolicyAttachment('sns_role_policy_attachment', {
   policyArn: snsPolicy.arn,
   role: snsRole.name,
});

new aws.sns.TopicSubscription('firehose_sub', {
  topic: snsTopic.arn,
  protocol: 'firehose',
  endpoint: firehoseStream.arn,
  subscriptionRoleArn: snsRole.arn,
}, {
  dependsOn: policyAttachment,
});

I can do that, thank you!