Plan to handle exsiting TransitGateway and its connections

[Karthik-K-N]

/kind feature
/area provider/ibmcloud

Describe the solution you'd like
[A clear and concise description of what you want to happen.]

Currently when TransitGateway details are not set the controller will automatically creates a TransitGateway and necessary connections.

Also we support user to pass existing TransitGateway and which already has attached connections to it.

We dont support case where a TransitGatewa exist and which does not have any connections and user is expecting controller to attach the connections.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Goal of this issue is to decide on

1. should we support this if not what are the alternatives
2. Consequence of supporting it.

[hamzy]

I expect the use cases to be the following:
Neither VPC nor TG are pre-existing.
TG is pre-existing, VPC is not.
VPC is pre-existing, TG is not.
Both VPC and TG are pre-existing.
#1 is already handled.
#2 is new for IPI. I expect the provider to create both connections.
#3 is not new.
#4 is new for IPI. For consistency, I expect the provider to create both connections.
So for every case, I expect the provider to create both connections.

[dharaneeshvrd]

Need changes in API status to store the status of the vpc and powervs connections separately to use them to take decision while deleting them.

+++ b/api/v1beta2/ibmpowervscluster_types.go
@@ -181,6 +181,19 @@ type ResourceReference struct {
        ControllerCreated *bool `json:"controllerCreated,omitempty"`
 }
 
+// TransitGatewayStatus defines the status of transit gateway as well as it's connection's status.
+type TransitGatewayStatus struct {
+       // id represents the id of the resource.
+       ID *string `json:"id,omitempty"`
+       // +kubebuilder:default=false
+       // controllerCreated indicates whether the resource is created by the controller.
+       ControllerCreated *bool `json:"controllerCreated,omitempty"`
+       // vpcConnection defines the vpc connection status in transit gateway.
+       VPCConnection *ResourceReference `json:"vpcConnection,omitempty"`
+       // powerVSConnection defines the powervs connection status in transit gateway.
+       PowerVSConnection *ResourceReference `json:"powerVSConnection,omitempty"`
+}
+
 // IBMPowerVSClusterStatus defines the observed state of IBMPowerVSCluster.
 type IBMPowerVSClusterStatus struct {
        // ready is true when the provider resource is ready.
@@ -209,7 +222,7 @@ type IBMPowerVSClusterStatus struct {
        VPCSecurityGroups map[string]VPCSecurityGroupStatus `json:"vpcSecurityGroups,omitempty"`
 
        // transitGateway is reference to IBM Cloud TransitGateway.
-       TransitGateway *ResourceReference `json:"transitGateway,omitempty"`
+       TransitGateway *TransitGatewayStatus `json:"transitGateway,omitempty"`
 
        // cosInstance is reference to IBM Cloud COS Instance resource.
        COSInstance *ResourceReference `json:"cosInstance,omitempty"

@mkumatag @Karthik-K-N Hope this API status change is ok and I can continue with the development.
Let me know if you have different thoughts on this!

[Karthik-K-N]

IBMPowerVSClusterStatus

Looks good to me, I think there is no need to do any spec changes right? I hope we should not allow user to create any connection with specific name and that requirement wont come.

[mkumatag]

@mkumatag @Karthik-K-N Hope this API status change is ok and I can continue with the development.
Let me know if you have different thoughts on this!

I see a change here in the status, we need to be little cautious here..

[hamzy]

I see a change here in the status, we need to be little cautious here..

Sure, but still proceed, right?

[dharaneeshvrd]

I hope we should not allow user to create any connection with specific name and that requirement wont come.

Yes Let's not do that, it will add more complications!