openstack: implement imds and metadata self

Signed-off-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>

internal/cloud/openstack/openstack.go

@@ -0,0 +1,53 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package openstack
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/edgelesssys/constellation/v2/internal/cloud/metadata"
+)
+
+// Cloud is the metadata client for OpenStack.
+type Cloud struct {
+	imds imdsAPI
+}
+
+// New creates a new OpenStack metadata client.
+func New(ctx context.Context) (*Cloud, error) {
+	imds := &imdsClient{client: &http.Client{}}
+	return &Cloud{imds: imds}, nil
+}
+
+// Self returns the metadata of the current instance.
+func (c *Cloud) Self(ctx context.Context) (metadata.InstanceMetadata, error) {
+	name, err := c.imds.name(ctx)
+	if err != nil {
+		return metadata.InstanceMetadata{}, fmt.Errorf("getting name: %w", err)
+	}
+	providerID, err := c.imds.providerID(ctx)
+	if err != nil {
+		return metadata.InstanceMetadata{}, fmt.Errorf("getting provider id: %w", err)
+	}
+	role, err := c.imds.role(ctx)
+	if err != nil {
+		return metadata.InstanceMetadata{}, fmt.Errorf("getting role: %w", err)
+	}
+	vpcIP, err := c.imds.vpcIP(ctx)
+	if err != nil {
+		return metadata.InstanceMetadata{}, fmt.Errorf("getting vpc ip: %w", err)
+	}
+
+	return metadata.InstanceMetadata{
+		Name:       name,
+		ProviderID: providerID,
+		Role:       role,
+		VPCIP:      vpcIP,
+	}, nil
+}