constellation/cli/internal/cmd/create.go
Christoph Meyer 1e11188dac AB#2033 User-friendly wrap and reword errors
fix: readOrGenerated function signature
2022-06-22 12:02:10 +01:00

231 lines
7.7 KiB
Go

package cmd
import (
"errors"
"fmt"
"io/fs"
"github.com/edgelesssys/constellation/cli/internal/azure"
"github.com/edgelesssys/constellation/cli/internal/cloudcmd"
"github.com/edgelesssys/constellation/cli/internal/gcp"
"github.com/edgelesssys/constellation/internal/cloud/cloudprovider"
"github.com/edgelesssys/constellation/internal/constants"
"github.com/edgelesssys/constellation/internal/file"
"github.com/spf13/afero"
"github.com/spf13/cobra"
)
// NewCreateCmd returns a new cobra.Command for the create command.
func NewCreateCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "create {aws|azure|gcp}",
Short: "Create instances on a cloud platform for your Constellation cluster",
Long: "Create instances on a cloud platform for your Constellation cluster.",
Args: cobra.MatchAll(
cobra.ExactArgs(1),
isCloudProvider(0),
warnAWS(0),
),
ValidArgsFunction: createCompletion,
RunE: runCreate,
}
cmd.Flags().String("name", "constell", "create the cluster with the specified name")
cmd.Flags().BoolP("yes", "y", false, "create the cluster without further confirmation")
cmd.Flags().IntP("control-plane-nodes", "c", 0, "number of control-plane nodes (required)")
must(cobra.MarkFlagRequired(cmd.Flags(), "control-plane-nodes"))
cmd.Flags().IntP("worker-nodes", "w", 0, "number of worker nodes (required)")
must(cobra.MarkFlagRequired(cmd.Flags(), "worker-nodes"))
cmd.Flags().StringP("instance-type", "t", "", "instance type of cluster nodes")
must(cmd.RegisterFlagCompletionFunc("instance-type", instanceTypeCompletion))
cmd.SetHelpTemplate(cmd.HelpTemplate() + fmt.Sprintf(`
Azure instance types:
%v
GCP instance types:
%v
`, formatInstanceTypes(azure.InstanceTypes), formatInstanceTypes(gcp.InstanceTypes)))
return cmd
}
func runCreate(cmd *cobra.Command, args []string) error {
provider := cloudprovider.FromString(args[0])
fileHandler := file.NewHandler(afero.NewOsFs())
creator := cloudcmd.NewCreator(cmd.OutOrStdout())
return create(cmd, creator, fileHandler, provider)
}
func create(cmd *cobra.Command, creator cloudCreator, fileHandler file.Handler, provider cloudprovider.Provider,
) (retErr error) {
flags, err := parseCreateFlags(cmd, provider)
if err != nil {
return err
}
if err := checkDirClean(fileHandler); err != nil {
return err
}
config, err := readConfig(cmd.OutOrStdout(), fileHandler, flags.configPath, provider)
if err != nil {
return fmt.Errorf("reading and validating config: %w", err)
}
if !flags.yes {
// Ask user to confirm action.
cmd.Printf("The following Constellation cluster will be created:\n")
cmd.Printf("%d control-planes nodes of type %s will be created.\n", flags.controllerCount, flags.insType)
cmd.Printf("%d worker nodes of type %s will be created.\n", flags.workerCount, flags.insType)
ok, err := askToConfirm(cmd, "Do you want to create this cluster?")
if err != nil {
return err
}
if !ok {
cmd.Println("The creation of the cluster was aborted.")
return nil
}
}
state, err := creator.Create(cmd.Context(), provider, config, flags.name, flags.insType, flags.controllerCount, flags.workerCount)
if err != nil {
return err
}
if err := fileHandler.WriteJSON(constants.StateFilename, state, file.OptNone); err != nil {
return err
}
cmd.Println("Your Constellation cluster was created successfully.")
return nil
}
// parseCreateFlags parses the flags of the create command.
func parseCreateFlags(cmd *cobra.Command, provider cloudprovider.Provider) (createFlags, error) {
controllerCount, err := cmd.Flags().GetInt("control-plane-nodes")
if err != nil {
return createFlags{}, fmt.Errorf("parsing number of control-plane nodes: %w", err)
}
if controllerCount < constants.MinControllerCount {
return createFlags{}, fmt.Errorf("number of control-plane nodes must be at least %d", constants.MinControllerCount)
}
workerCount, err := cmd.Flags().GetInt("worker-nodes")
if err != nil {
return createFlags{}, fmt.Errorf("parsing number of worker nodes: %w", err)
}
if workerCount < constants.MinWorkerCount {
return createFlags{}, fmt.Errorf("number of worker nodes must be at least %d", constants.MinWorkerCount)
}
insType, err := cmd.Flags().GetString("instance-type")
if err != nil {
return createFlags{}, fmt.Errorf("parsing instance type argument: %w", err)
}
if insType == "" {
insType = defaultInstanceType(provider)
}
if err := validInstanceTypeForProvider(cmd, insType, provider); err != nil {
return createFlags{}, err
}
name, err := cmd.Flags().GetString("name")
if err != nil {
return createFlags{}, fmt.Errorf("parsing name argument: %w", err)
}
if len(name) > constants.ConstellationNameLength {
return createFlags{}, fmt.Errorf(
"name for Constellation cluster too long, maximum length is %d, got %d: %s",
constants.ConstellationNameLength, len(name), name,
)
}
yes, err := cmd.Flags().GetBool("yes")
if err != nil {
return createFlags{}, fmt.Errorf("%w; Set '-yes' without a value to automatically confirm", err)
}
configPath, err := cmd.Flags().GetString("config")
if err != nil {
return createFlags{}, fmt.Errorf("parsing config path argument: %w", err)
}
return createFlags{
controllerCount: controllerCount,
workerCount: workerCount,
insType: insType,
name: name,
configPath: configPath,
yes: yes,
}, nil
}
// createFlags contains the parsed flags of the create command.
type createFlags struct {
controllerCount int
workerCount int
insType string
name string
configPath string
yes bool
}
// defaultInstanceType returns the default instance type for the given provider.
func defaultInstanceType(provider cloudprovider.Provider) string {
switch provider {
case cloudprovider.GCP:
return gcp.InstanceTypes[0]
case cloudprovider.Azure:
return azure.InstanceTypes[0]
default:
return ""
}
}
// checkDirClean checks if files of a previous Constellation are left in the current working dir.
func checkDirClean(fileHandler file.Handler) error {
if _, err := fileHandler.Stat(constants.StateFilename); !errors.Is(err, fs.ErrNotExist) {
return fmt.Errorf("file '%s' already exists in working directory, run 'constellation terminate' before creating a new one", constants.StateFilename)
}
if _, err := fileHandler.Stat(constants.AdminConfFilename); !errors.Is(err, fs.ErrNotExist) {
return fmt.Errorf("file '%s' already exists in working directory, run 'constellation terminate' before creating a new one", constants.AdminConfFilename)
}
if _, err := fileHandler.Stat(constants.MasterSecretFilename); !errors.Is(err, fs.ErrNotExist) {
return fmt.Errorf("file '%s' already exists in working directory. Constellation won't overwrite previous master secrets. Move it somewhere or delete it before creating a new cluster", constants.MasterSecretFilename)
}
return nil
}
// createCompletion handles the completion of the create command. It is frequently called
// while the user types arguments of the command to suggest completion.
func createCompletion(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
switch len(args) {
case 0:
return []string{"aws", "gcp", "azure"}, cobra.ShellCompDirectiveNoFileComp
default:
return []string{}, cobra.ShellCompDirectiveError
}
}
func must(err error) {
if err != nil {
panic(err)
}
}
func instanceTypeCompletion(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
if len(args) != 1 {
return []string{}, cobra.ShellCompDirectiveError
}
switch args[0] {
case "gcp":
return gcp.InstanceTypes, cobra.ShellCompDirectiveNoFileComp
case "azure":
return azure.InstanceTypes, cobra.ShellCompDirectiveNoFileComp
default:
return []string{}, cobra.ShellCompDirectiveError
}
}