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/qemu/autoscaler.go

@@ -0,0 +1,39 @@
+package qemu
+
+import (
+	"github.com/edgelesssys/constellation/internal/kubernetes"
+	k8s "k8s.io/api/core/v1"
+)
+
+// Autoscaler holds the QEMU cluster-autoscaler configuration.
+type Autoscaler struct{}
+
+// Name returns the cloud-provider name as used by k8s cluster-autoscaler.
+func (a Autoscaler) Name() string {
+	return "qemu"
+}
+
+// Secrets returns a list of secrets to deploy together with the k8s cluster-autoscaler.
+func (a Autoscaler) Secrets(providerID, cloudServiceAccountURI string) (kubernetes.Secrets, error) {
+	return kubernetes.Secrets{}, nil
+}
+
+// Volumes returns a list of volumes to deploy together with the k8s cluster-autoscaler.
+func (a Autoscaler) Volumes() []k8s.Volume {
+	return []k8s.Volume{}
+}
+
+// VolumeMounts returns a list of volume mounts to deploy together with the k8s cluster-autoscaler.
+func (a Autoscaler) VolumeMounts() []k8s.VolumeMount {
+	return []k8s.VolumeMount{}
+}
+
+// Env returns a list of k8s environment key-value pairs to deploy together with the k8s cluster-autoscaler.
+func (a Autoscaler) Env() []k8s.EnvVar {
+	return []k8s.EnvVar{}
+}
+
+// Supported is used to determine if we support autoscaling for the cloud provider.
+func (a Autoscaler) Supported() bool {
+	return false
+}

internal/cloud/qemu/ccm.go

@@ -0,0 +1,73 @@
+package qemu
+
+import (
+	"context"
+
+	"github.com/edgelesssys/constellation/internal/cloud/metadata"
+	"github.com/edgelesssys/constellation/internal/kubernetes"
+	"github.com/edgelesssys/constellation/internal/versions"
+	k8s "k8s.io/api/core/v1"
+)
+
+// CloudControllerManager holds the QEMU cloud-controller-manager configuration.
+type CloudControllerManager struct{}
+
+// Image returns the container image used to provide cloud-controller-manager for the cloud-provider.
+func (c CloudControllerManager) Image(k8sVersion versions.ValidK8sVersion) (string, error) {
+	return "", nil
+}
+
+// Path returns the path used by cloud-controller-manager executable within the container image.
+func (c CloudControllerManager) Path() string {
+	return "/qemu-cloud-controller-manager"
+}
+
+// Name returns the cloud-provider name as used by k8s cloud-controller-manager (k8s.gcr.io/cloud-controller-manager).
+func (c CloudControllerManager) Name() string {
+	return "qemu"
+}
+
+// ExtraArgs returns a list of arguments to append to the cloud-controller-manager command.
+func (c CloudControllerManager) ExtraArgs() []string {
+	return []string{}
+}
+
+// ConfigMaps returns a list of ConfigMaps to deploy together with the k8s cloud-controller-manager
+// Reference: https://kubernetes.io/docs/concepts/configuration/configmap/ .
+func (c CloudControllerManager) ConfigMaps(instance metadata.InstanceMetadata) (kubernetes.ConfigMaps, error) {
+	return kubernetes.ConfigMaps{}, nil
+}
+
+// Secrets returns a list of secrets to deploy together with the k8s cloud-controller-manager.
+// Reference: https://kubernetes.io/docs/concepts/configuration/secret/ .
+func (c CloudControllerManager) Secrets(ctx context.Context, providerID, cloudServiceAccountURI string) (kubernetes.Secrets, error) {
+	return kubernetes.Secrets{}, nil
+}
+
+// Volumes returns a list of volumes to deploy together with the k8s cloud-controller-manager.
+// Reference: https://kubernetes.io/docs/concepts/storage/volumes/ .
+func (c CloudControllerManager) Volumes() []k8s.Volume {
+	return []k8s.Volume{}
+}
+
+// VolumeMounts a list of of volume mounts to deploy together with the k8s cloud-controller-manager.
+func (c CloudControllerManager) VolumeMounts() []k8s.VolumeMount {
+	return []k8s.VolumeMount{}
+}
+
+// Env returns a list of k8s environment key-value pairs to deploy together with the k8s cloud-controller-manager.
+func (c CloudControllerManager) Env() []k8s.EnvVar {
+	return []k8s.EnvVar{}
+}
+
+// PrepareInstance is called on every instance before deploying the cloud-controller-manager.
+// Allows for cloud-provider specific hooks.
+func (c CloudControllerManager) PrepareInstance(instance metadata.InstanceMetadata, vpnIP string) error {
+	// no specific hook required.
+	return nil
+}
+
+// Supported is used to determine if cloud controller manager is implemented for this cloud provider.
+func (c CloudControllerManager) Supported() bool {
+	return false
+}

internal/cloud/qemu/cloudnodemanager.go

@@ -0,0 +1,29 @@
+package qemu
+
+import "github.com/edgelesssys/constellation/internal/versions"
+
+// CloudNodeManager holds the QEMU cloud-node-manager configuration.
+type CloudNodeManager struct{}
+
+// Image returns the container image used to provide cloud-node-manager for the cloud-provider.
+// Not used on QEMU.
+func (c *CloudNodeManager) Image(k8sVersion versions.ValidK8sVersion) (string, error) {
+	return "", nil
+}
+
+// Path returns the path used by cloud-node-manager executable within the container image.
+// Not used on QEMU.
+func (c *CloudNodeManager) Path() string {
+	return ""
+}
+
+// ExtraArgs returns a list of arguments to append to the cloud-node-manager command.
+// Not used on QEMU.
+func (c *CloudNodeManager) ExtraArgs() []string {
+	return []string{}
+}
+
+// Supported is used to determine if cloud node manager is implemented for this cloud provider.
+func (c *CloudNodeManager) Supported() bool {
+	return false
+}

internal/cloud/qemu/logger.go

@@ -0,0 +1,38 @@
+package qemu
+
+import (
+	"context"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+// Logger is a Cloud Logger for QEMU.
+type Logger struct{}
+
+// NewLogger creates a new Cloud Logger for QEMU.
+func NewLogger() *Logger {
+	return &Logger{}
+}
+
+// Disclose writes log information to QEMU's cloud log.
+// This is done by sending a POST request to the QEMU's metadata endpoint.
+func (l *Logger) Disclose(msg string) {
+	url := &url.URL{
+		Scheme: "http",
+		Host:   qemuMetadataEndpoint,
+		Path:   "/log",
+	}
+
+	req, _ := http.NewRequestWithContext(context.Background(), http.MethodPost, url.String(), strings.NewReader(msg))
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := http.DefaultClient.Do(req)
+	if err == nil {
+		defer resp.Body.Close()
+	}
+}
+
+// Close is a no-op.
+func (l *Logger) Close() error {
+	return nil
+}

internal/cloud/qemu/metadata.go

@@ -0,0 +1,103 @@
+package qemu
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"net/url"
+
+	"github.com/edgelesssys/constellation/internal/cloud/metadata"
+)
+
+const qemuMetadataEndpoint = "10.42.0.1:8080"
+
+// Metadata implements core.ProviderMetadata interface for QEMU.
+type Metadata struct{}
+
+// Supported is used to determine if metadata API is implemented for this cloud provider.
+func (m *Metadata) Supported() bool {
+	return true
+}
+
+// List retrieves all instances belonging to the current constellation.
+func (m *Metadata) List(ctx context.Context) ([]metadata.InstanceMetadata, error) {
+	instancesRaw, err := m.retrieveMetadata(ctx, "/peers")
+	if err != nil {
+		return nil, err
+	}
+
+	var instances []metadata.InstanceMetadata
+	err = json.Unmarshal(instancesRaw, &instances)
+	return instances, err
+}
+
+// Self retrieves the current instance.
+func (m *Metadata) Self(ctx context.Context) (metadata.InstanceMetadata, error) {
+	instanceRaw, err := m.retrieveMetadata(ctx, "/self")
+	if err != nil {
+		return metadata.InstanceMetadata{}, err
+	}
+
+	var instance metadata.InstanceMetadata
+	err = json.Unmarshal(instanceRaw, &instance)
+	return instance, err
+}
+
+// GetInstance retrieves an instance using its providerID.
+func (m Metadata) GetInstance(ctx context.Context, providerID string) (metadata.InstanceMetadata, error) {
+	instances, err := m.List(ctx)
+	if err != nil {
+		return metadata.InstanceMetadata{}, err
+	}
+
+	for _, instance := range instances {
+		if instance.ProviderID == providerID {
+			return instance, nil
+		}
+	}
+	return metadata.InstanceMetadata{}, errors.New("instance not found")
+}
+
+// SupportsLoadBalancer returns true if the cloud provider supports load balancers.
+func (m Metadata) SupportsLoadBalancer() bool {
+	return false
+}
+
+// GetLoadBalancerEndpoint returns the endpoint of the load balancer.
+func (m Metadata) GetLoadBalancerEndpoint(ctx context.Context) (string, error) {
+	panic("function *Metadata.GetLoadBalancerEndpoint not implemented")
+}
+
+// UID returns the UID of the constellation.
+func (m Metadata) UID(ctx context.Context) (string, error) {
+	// We expect only one constellation to be deployed in the same QEMU / libvirt environment.
+	// the UID can be an empty string.
+	return "", nil
+}
+
+// GetSubnetworkCIDR retrieves the subnetwork CIDR from cloud provider metadata.
+func (m Metadata) GetSubnetworkCIDR(ctx context.Context) (string, error) {
+	return "10.244.0.0/16", nil
+}
+
+func (m Metadata) retrieveMetadata(ctx context.Context, uri string) ([]byte, error) {
+	url := &url.URL{
+		Scheme: "http",
+		Host:   qemuMetadataEndpoint,
+		Path:   uri,
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+	res, err := (&http.Client{}).Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	return io.ReadAll(res.Body)
+}