data-source/aws_neptune_orderable_db_instance: New data source

[YakDriver]

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Relates #14882

Description

Knowing which combinations of DB instance class, engine, engine version, and license model are available is non-trivial especially in GovCloud and other specialty partitions. For example, attempting to use a t3.small on GovCloud, a valid option for us-west-2 in the standard partition, gives this error:

Error creating DB Instance: InvalidParameterCombination: RDS does not support creating a DB instance with the following combination: DBInstanceClass=db.t3.small, Engine=mysql, EngineVersion=5.6.41, LicenseModel=general-public-license. For supported combinations of instance class and database engine version, see the documentation.

I envision something similar to aws_ec2_instance_type_offering.

New or Affected Resource(s)

• aws_nepture_orderable_db_instance

Potential Terraform Configuration

data "aws_neptune_orderable_db_instance" "test" {
  availability_zone_group = "us-west-2-lax-1"
  db_instance_class = "db.t2.small"
  engine = "mysql"
  engine_version = "5.7"
  license_model = "general-public-license"

  preferred_instance_types = ["t3.micro", "t2.micro"]
}

resource "aws_neptune_db_instance" "source" {
  allocated_storage   = 5
  engine              = data.aws_rds_orderable_db_instance.test.engine    # "mysql"
  engine_version      = data.aws_rds_orderable_db_instance.test.engine_version    # "5.7.22"
  identifier          = "db-source"
  instance_class      = data.aws_rds_orderable_db_instance.test.instance_class    # "db.m3.medium"
  password            = "avoid-plaintext-passwords"
  username            = "tfacctest"
  skip_final_snapshot = true
}

References

• resource/db_instance
• data-source/db_instance
• data-source/ec2_instance_type_offering

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!