Allow using the provider without pre-defined configuration

[fernandocarletti]

In many cases we use cloud providers to create a MySQL server. When using services such as RDS, the endpoint, username and password are created right before the databases are created.

If the configuration is not previously set, the following error is thrown:

Previewing update (development):

     Type                 Name                       Plan     Info
     pulumi:pulumi:Stack  mysql-example-development           1 error

Diagnostics:
  pulumi:pulumi:Stack (mysql-example-development):
    error: Missing required configuration variable 'mysql:endpoint'
    	please set a value using the command `pulumi config set mysql:endpoint <value>`

This is the approach mentioned above:

import * as mysql from '@pulumi/mysql';
import * as aws from '@pulumi/aws';


const rds = new aws.rds.Instance('sample', {
  identifier: "sample",
  engine: "mysql",
  username: "rootUser",
  password: "rootPassword",
  dbSubnetGroupName: "xxxxx",
  availabilityZone: "us-east-1b",
  instanceClass: "db.t2.micro",
  allocatedStorage: 20,
  vpcSecurityGroupIds: ['sg-c1cxxxxx'],
  skipFinalSnapshot: true,
});

const mysqlProvider = new mysql.Provider('mysql', {
  endpoint: rds.endpoint,
  username: rds.username,
  password: rds.password.apply(p => p.toString()),
});

const databaase = new mysql.Database('sample', {
  name: 'sample',
}, {
  provider: mysqlProvider
});

Maybe defaulting the configuration to localhost, root and empty password as many tools do could be a good approach. WDYT?

[fernandocarletti]

This scenario is being discussed here: pulumi/pulumi#2725

[fernandocarletti]

Hello @lukehoban. It seems the issue is a bit worse right now. Even with defaults set, I get a missing required key error:

[fernandocarletti]

The issue was in our side. We were referencing another stack and using the wrong username attribute:

const mysqlProvider = new mysql.Provider('mysql', {
    endpoint: rds.apply(r => r.endpoint),
-    username: rds.apply(r => r.username),
+    username: rds.apply(r => r.masterUsername),
    password: rdsRootDatabasePassword.apply(p => p.toString()),
});

Since the username was undefined, it was trying to fallback to the defaults.

I'm closing it again.