Move cloud metadata packages and kubernetes resources marshaling to internal

Decouples cloud provider metadata packages from kubernetes related code

Signed-off-by: Malte Poll <mp@edgeless.systems>

internal/cloud/gcp/metadata.go

@@ -0,0 +1,135 @@
+package gcp
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/edgelesssys/constellation/internal/cloud/metadata"
+	"github.com/edgelesssys/constellation/internal/gcpshared"
+)
+
+// API handles all GCP API requests.
+type API interface {
+	// UID retrieves the current instances uid.
+	UID() (string, error)
+	// RetrieveInstances retrieves a list of all accessible GCP instances with their metadata.
+	RetrieveInstances(ctx context.Context, project, zone string) ([]metadata.InstanceMetadata, error)
+	// RetrieveInstances retrieves a single GCP instances with its metadata.
+	RetrieveInstance(ctx context.Context, project, zone, instanceName string) (metadata.InstanceMetadata, error)
+	// RetrieveInstanceMetadata retrieves the GCP instance metadata of the current instance.
+	RetrieveInstanceMetadata(attr string) (string, error)
+	// RetrieveProjectID retrieves the GCP  projectID containing the current instance.
+	RetrieveProjectID() (string, error)
+	// RetrieveZone retrieves the GCP zone containing the current instance.
+	RetrieveZone() (string, error)
+	// RetrieveInstanceName retrieves the instance name of the current instance.
+	RetrieveInstanceName() (string, error)
+	// RetrieveSubnetworkAliasCIDR retrieves the subnetwork CIDR of the current instance.
+	RetrieveSubnetworkAliasCIDR(ctx context.Context, project, zone, instanceName string) (string, error)
+	// RetrieveLoadBalancerEndpoint retrieves the load balancer endpoint of the current instance.
+	RetrieveLoadBalancerEndpoint(ctx context.Context, project, zone string) (string, error)
+	// SetInstanceMetadata sets metadata key: value of the instance specified by project, zone and instanceName.
+	SetInstanceMetadata(ctx context.Context, project, zone, instanceName, key, value string) error
+	// UnsetInstanceMetadata removes a metadata key-value pair of the instance specified by project, zone and instanceName.
+	UnsetInstanceMetadata(ctx context.Context, project, zone, instanceName, key string) error
+}
+
+// Metadata implements core.ProviderMetadata interface.
+type Metadata struct {
+	api API
+}
+
+// New creates a new Provider with real API and FS.
+func New(api API) *Metadata {
+	return &Metadata{
+		api: api,
+	}
+}
+
+// List retrieves all instances belonging to the current constellation.
+func (m *Metadata) List(ctx context.Context) ([]metadata.InstanceMetadata, error) {
+	project, err := m.api.RetrieveProjectID()
+	if err != nil {
+		return nil, err
+	}
+	zone, err := m.api.RetrieveZone()
+	if err != nil {
+		return nil, err
+	}
+	instances, err := m.api.RetrieveInstances(ctx, project, zone)
+	if err != nil {
+		return nil, fmt.Errorf("retrieving instances list from GCP api: %w", err)
+	}
+	return instances, nil
+}
+
+// Self retrieves the current instance.
+func (m *Metadata) Self(ctx context.Context) (metadata.InstanceMetadata, error) {
+	project, err := m.api.RetrieveProjectID()
+	if err != nil {
+		return metadata.InstanceMetadata{}, err
+	}
+	zone, err := m.api.RetrieveZone()
+	if err != nil {
+		return metadata.InstanceMetadata{}, err
+	}
+	instanceName, err := m.api.RetrieveInstanceName()
+	if err != nil {
+		return metadata.InstanceMetadata{}, err
+	}
+	return m.api.RetrieveInstance(ctx, project, zone, instanceName)
+}
+
+// GetInstance retrieves an instance using its providerID.
+func (m *Metadata) GetInstance(ctx context.Context, providerID string) (metadata.InstanceMetadata, error) {
+	project, zone, instanceName, err := gcpshared.SplitProviderID(providerID)
+	if err != nil {
+		return metadata.InstanceMetadata{}, fmt.Errorf("invalid providerID: %w", err)
+	}
+	return m.api.RetrieveInstance(ctx, project, zone, instanceName)
+}
+
+// GetSubnetworkCIDR returns the subnetwork CIDR of the current instance.
+func (m *Metadata) GetSubnetworkCIDR(ctx context.Context) (string, error) {
+	project, err := m.api.RetrieveProjectID()
+	if err != nil {
+		return "", err
+	}
+	zone, err := m.api.RetrieveZone()
+	if err != nil {
+		return "", err
+	}
+	instanceName, err := m.api.RetrieveInstanceName()
+	if err != nil {
+		return "", err
+	}
+	return m.api.RetrieveSubnetworkAliasCIDR(ctx, project, zone, instanceName)
+}
+
+// SupportsLoadBalancer returns true if the cloud provider supports load balancers.
+func (m *Metadata) SupportsLoadBalancer() bool {
+	return true
+}
+
+// GetLoadBalancerEndpoint returns the endpoint of the load balancer.
+func (m *Metadata) GetLoadBalancerEndpoint(ctx context.Context) (string, error) {
+	project, err := m.api.RetrieveProjectID()
+	if err != nil {
+		return "", err
+	}
+	zone, err := m.api.RetrieveZone()
+	if err != nil {
+		return "", err
+	}
+	return m.api.RetrieveLoadBalancerEndpoint(ctx, project, zone)
+}
+
+// UID retrieves the UID of the constellation.
+func (m *Metadata) UID(ctx context.Context) (string, error) {
+	return m.api.UID()
+}
+
+// Supported is used to determine if metadata API is implemented for this cloud provider.
+func (m *Metadata) Supported() bool {
+	return true
+}