aws.appsync.Function defaults to generating an invalid function name

[alexmcmanus]

Pulumi generates a name argument for most resources by appending a unique suffix to the resource name. E.g.

const lookupInputBusinessId = new aws.appsync.Function('lookupInputBusinessId', ...)

...will generate a function name like lookupInputBusinessId-058765e. Unfortunately, - is not a legal character for a function name.

Pulumi -> Terraform -> AWS happily lets you create a function with an illegal name however. After creating it, the AWS console won't let you edit the function, reporting that the name is illegal. And even more strangely, if you then try and modify the function and update via Pulumi, it leads to the following error:

BadRequestException: Invalid Function name given, must match pattern [_A-Za-z][_0-9A-Za-z]*

Note that appsync function names do not need to be unique - the functionId is used to reference the function and not the name. So I think that adding the unique suffix is unnecessary in this case.

There is a simple workaround: explicitly specify the name in the Pulumi config:

const lookupInputBusinessId = new aws.appsync.Function('lookupInputBusinessId', {
  name: 'lookupInputBusinessId',
  ...
})