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cli.go
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cli.go
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package instances
import (
"errors"
"flag"
"fmt"
"strings"
)
type CLI struct {
db *Database
cloudProviders map[string]CloudProvider
}
func NewCLI(db *Database, cloudProviders map[string]CloudProvider) *CLI {
return &CLI{db, cloudProviders}
}
func (c *CLI) Run(args []string) error {
if len(args) == 0 {
return errors.New("use subcommand")
}
switch args[0] {
case "add":
return c.addInstance(args[1:])
case "rm":
return c.removeInstance(args[1:])
case "status":
return c.getInstanceStatus(args[1:])
case "start":
return c.startInstance(args[1:])
case "stop":
return c.stopInstance(args[1:])
case "list":
return c.listInstances(args[1:])
default:
return errors.New("unknown subcommand")
}
}
func (c *CLI) addInstance(args []string) error {
var cloudName, instanceName string
addCmd := flag.NewFlagSet("add", flag.ContinueOnError)
addCmd.Usage = func() {
fmt.Print(
"Usage: instances add [OPTIONS] INSTANCE_ID\n\n",
"Add the instance INSTANCE_ID to the tracked instances\n\n",
)
addCmd.PrintDefaults()
}
addCmd.StringVar(&cloudName, "cloud", "", "the cloud provider (one of AWS, Azure, GCP)")
addCmd.StringVar(&instanceName, "name", "", "the name under which to store the instance (by default, the instance name in the cloud provider)")
err := addCmd.Parse(args)
if err != nil {
return err
}
if addCmd.NArg() == 0 {
addCmd.Usage()
return errors.New("missing instance ID")
}
if addCmd.NArg() > 1 {
addCmd.Usage()
return errors.New("only one instance ID can be provided")
}
instanceId := addCmd.Arg(0)
cloudProvider, exists := c.cloudProviders[strings.ToLower(cloudName)]
if !exists {
return fmt.Errorf("unsupported cloud provider %q", cloudName)
}
err = c.db.AddInstance(instanceId, instanceName, cloudProvider)
if err != nil {
return err
}
return nil
}
func (c *CLI) removeInstance(args []string) error {
removeCmd := flag.NewFlagSet("rm", flag.ContinueOnError)
removeCmd.Usage = func() {
fmt.Print(
"Usage: instances rm INSTANCE_NAME\n\n",
"Remove the instance INSTANCE_NAME from the list of tracked instances\n\n",
)
removeCmd.PrintDefaults()
}
name, err := parseInstanceName(removeCmd, args)
if err != nil {
return err
}
err = c.db.RemoveInstance(name)
if err != nil {
return err
}
return nil
}
func (c *CLI) getInstanceStatus(args []string) error {
statusCmd := flag.NewFlagSet("status", flag.ContinueOnError)
statusCmd.Usage = func() {
fmt.Print(
"Usage: instances status INSTANCE_NAME\n\n",
"Print the status of the instance INSTANCE_NAME\n\n",
)
statusCmd.PrintDefaults()
}
name, err := parseInstanceName(statusCmd, args)
if err != nil {
return err
}
instance, err := c.db.GetInstance(name)
if err != nil {
return err
}
cloudProvider, err := instance.GetCloudProvider(c.cloudProviders)
if err != nil {
return fmt.Errorf("could not get instance status: %v", err)
}
status, err := cloudProvider.GetInstanceStatus(instance.Id)
if err != nil {
return err
}
fmt.Println(status)
return nil
}
func (c *CLI) startInstance(args []string) error {
startCmd := flag.NewFlagSet("start", flag.ContinueOnError)
startCmd.Usage = func() {
fmt.Print(
"Usage: instances start INSTANCE_NAME\n\n",
"Start the instance INSTANCE_NAME\n\n",
)
startCmd.PrintDefaults()
}
name, err := parseInstanceName(startCmd, args)
if err != nil {
return err
}
instance, err := c.db.GetInstance(name)
if err != nil {
return err
}
cloudProvider, err := instance.GetCloudProvider(c.cloudProviders)
if err != nil {
return err
}
err = cloudProvider.StartInstance(instance.Id)
if err != nil {
return err
}
return nil
}
func (c *CLI) stopInstance(args []string) error {
stopCmd := flag.NewFlagSet("stop", flag.ContinueOnError)
stopCmd.Usage = func() {
fmt.Print(
"Usage: instances stop INSTANCE_NAME\n\n",
"Stop the instance INSTANCE_NAME\n\n",
)
stopCmd.PrintDefaults()
}
name, err := parseInstanceName(stopCmd, args)
if err != nil {
return err
}
instance, err := c.db.GetInstance(name)
if err != nil {
return err
}
cloudProvider, err := instance.GetCloudProvider(c.cloudProviders)
if err != nil {
return err
}
err = cloudProvider.StopInstance(instance.Id)
if err != nil {
return err
}
return nil
}
func (c *CLI) listInstances(args []string) error {
var cloudName string
listCmd := flag.NewFlagSet("list", flag.ContinueOnError)
listCmd.StringVar(&cloudName, "cloud", "", "the cloud provider to list instances from")
listCmd.Usage = func() {
fmt.Print(
"Usage: instances list [OPTIONS]\n\n",
"List the instances\n\n",
)
}
err := listCmd.Parse(args)
if err != nil {
return err
}
if len(listCmd.Args()) > 0 {
return errors.New("list doesn't take positional arguments")
}
for name, instance := range c.db.Instances {
if cloudName != "" && !strings.EqualFold(instance.CloudProviderName, cloudName) {
continue
}
fmt.Printf("name: %s\tid: %s\tcloud provider: %s\n", name, instance.Id, instance.CloudProviderName)
}
return nil
}
func parseInstanceName(cmd *flag.FlagSet, args []string) (string, error) {
err := cmd.Parse(args)
if err != nil {
return "", err
}
if len(cmd.Args()) == 0 {
cmd.Usage()
return "", errors.New("missing instance name")
}
if len(cmd.Args()) > 1 {
cmd.Usage()
return "", errors.New("only one instance name can be provided")
}
return cmd.Arg(0), nil
}