(ec2.Vpc): Vpc.fromLookup should throw if subnet group name tag is explicitly given and does not exist #13962
Description
I suspect this may be a bug or I'm missing something.
I have an existing VPC with 6 subnets with a tag subnet_tier
| AZ1 | AZ2 | TAG: subnet_tier |
|---|---|---|
| public_subnet_1 | public_subnet_2 | public |
| private_subnet_1 | private_subnet_2 | private |
| data_subnet_1 | data_subnet_2 | data |
From my understanding of Vpc.from_lookup I can supply subnet_group_name_tag will assign the subnets to the correct group inside cdk.context.json
So I can then create a SubnetSelection expected by multiple resources (eg. Function)
So when I add following code in my stack I get an error.
vpc = Vpc.from_lookup(
self,
"VPC",
vpc_id="vpc-123456",
subnet_group_name_tag="subnet_tier",
)
subnets = vpc.select_subnets(subnet_group_name='data').subnets
PythonFunction(
self,
"Function",
...
vpc=vpc,
vpc_subnets=subnets
)
Actual result
cdk.context.json is created with SubnetGroups
"subnetGroups": [
{
"name": "Private",
"type": "Private",
},
{
"name": "public",
"type": "Public",
}
]
Error message raised:
jsii.errors.JSIIError: You cannot reference a Subnet's availability zone if it was not supplied. Add the availabilityZone when importing using Subnet.fromSubnetAttributes()
Expected result
"subnetGroups": [
{
"name": "private",
"type": "Private",
},
{
"name": "data",
"type": "Private",
},
{
"name": "public",
"type": "Public",
}
]
No errors.
Environment
- CDK CLI Version: 1.96.0 (build 39f3df8)
- Module Version: ec2
- Node.js Version: N/A python CDK 1.96.0
- OS: macOS
- Language (Version): Python (3.8.6)