Use Terraform for create on GCP

cli/internal/terraform/variables.go

@@ -0,0 +1,117 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package terraform
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Variables is a struct that holds all variables that are passed to Terraform.
+type Variables interface {
+	fmt.Stringer
+}
+
+// CommonVariables is user configuration for creating a cluster with Terraform.
+type CommonVariables struct {
+	// Name of the cluster.
+	Name string
+	// CountControlPlanes is the number of control-plane nodes to create.
+	CountControlPlanes int
+	// CountWorkers is the number of worker nodes to create.
+	CountWorkers int
+	// StateDiskSizeGB is the size of the state disk to allocate to each node, in GB.
+	StateDiskSizeGB int
+}
+
+// String returns a string representation of the variables, formatted as Terraform variables.
+func (v *CommonVariables) String() string {
+	b := &strings.Builder{}
+	writeLinef(b, "name = %q", v.Name)
+	writeLinef(b, "control_plane_count = %d", v.CountControlPlanes)
+	writeLinef(b, "worker_count = %d", v.CountWorkers)
+	writeLinef(b, "state_disk_size = %d", v.StateDiskSizeGB)
+
+	return b.String()
+}
+
+// GCPVariables is user configuration for creating a cluster with Terraform on GCP.
+type GCPVariables struct {
+	// CommonVariables contains common variables.
+	CommonVariables
+
+	// Project is the ID of the GCP project to use.
+	Project string
+	// Region is the GCP region to use.
+	Region string
+	// Zone is the GCP zone to use.
+	Zone string
+	// CredentialsFile is the path to the GCP credentials file.
+	CredentialsFile string
+	// InstanceType is the GCP instance type to use.
+	InstanceType string
+	// StateDiskType is the GCP disk type to use for the state disk.
+	StateDiskType string
+	// ImageID is the ID of the GCP image to use.
+	ImageID string
+	// Debug is true if debug mode is enabled.
+	Debug bool
+}
+
+// String returns a string representation of the variables, formatted as Terraform variables.
+func (v *GCPVariables) String() string {
+	b := &strings.Builder{}
+	b.WriteString(v.CommonVariables.String())
+	writeLinef(b, "project = %q", v.Project)
+	writeLinef(b, "region = %q", v.Region)
+	writeLinef(b, "zone = %q", v.Zone)
+	writeLinef(b, "credentials_file = %q", v.CredentialsFile)
+	writeLinef(b, "instance_type = %q", v.InstanceType)
+	writeLinef(b, "state_disk_type = %q", v.StateDiskType)
+	writeLinef(b, "image_id = %q", v.ImageID)
+	writeLinef(b, "debug = %t", v.Debug)
+
+	return b.String()
+}
+
+// QEMUVariables is user configuration for creating a QEMU cluster with Terraform.
+type QEMUVariables struct {
+	// CommonVariables contains common variables.
+	CommonVariables
+
+	// CPUCount is the number of CPUs to allocate to each node.
+	CPUCount int
+	// MemorySizeMiB is the amount of memory to allocate to each node, in MiB.
+	MemorySizeMiB int
+	// IPRangeStart is the first IP address in the IP range to allocate to the cluster.
+	IPRangeStart int
+	// ImagePath is the path to the image to use for the nodes.
+	ImagePath string
+	// ImageFormat is the format of the image from ImagePath.
+	ImageFormat string
+	// MetadataAPIImage is the container image to use for the metadata API.
+	MetadataAPIImage string
+}
+
+// String returns a string representation of the variables, formatted as Terraform variables.
+func (v *QEMUVariables) String() string {
+	b := &strings.Builder{}
+	b.WriteString(v.CommonVariables.String())
+	writeLinef(b, "constellation_coreos_image = %q", v.ImagePath)
+	writeLinef(b, "image_format = %q", v.ImageFormat)
+	writeLinef(b, "vcpus = %d", v.CPUCount)
+	writeLinef(b, "memory = %d", v.MemorySizeMiB)
+	writeLinef(b, "ip_range_start = %d", v.IPRangeStart)
+	writeLinef(b, "metadata_api_image = %q", v.MetadataAPIImage)
+
+	return b.String()
+}
+
+func writeLinef(builder *strings.Builder, format string, a ...interface{}) {
+	builder.WriteString(fmt.Sprintf(format, a...))
+	builder.WriteByte('\n')
+}