Add support for VKE version upgrades (#263)

* WIP: add upgrade commands and printer to kubernetes

* Move upgrade commands to sub-command and add docs

* Inline error handling

* Change upgrade command to be less redundant

cmd/kubernetes.go

@@ -94,7 +94,7 @@ var (
 	vultr-cli kubernetes config ffd31f18-5f77-454c-9065-212f942c3c35
 
 	# Shortened with alias commands
-	vultr-cli k config ffd31f18-5f77-454c-9065-212f942c3c35'
+	vultr-cli k config ffd31f18-5f77-454c-9065-212f942c3c35
 	`
 
 	getVersionsLong    = `Returns a list of supported kubernetes versions you can deploy`
@@ -103,7 +103,34 @@ var (
 	vultr-cli kubernetes versions
 
 	# Shortened with alias commands
-	vultr-cli k v'
+	vultr-cli k v
+	`
+
+	upgradesLong    = `Display available kubernetes upgrade commands`
+	upgradesExample = `
+	# Full example
+	vultr-cli kubernetes upgrades
+
+	# Shortened example with aliases
+	vultr-cli k e
+	`
+
+	getUpgradesLong    = `Returns a list of available kubernetes version the cluster can be upgraded to`
+	getUpgradesExample = `
+	# Full example
+	vultr-cli kubernetes upgrades list d4908765-b82a-4e7d-83d9-c0bc4c6a36d0
+
+	# Shortened with alias commands
+	vultr-cli k e l d4908765-b82a-4e7d-83d9-c0bc4c6a36d0
+	`
+
+	upgradeLong    = `Initiate an upgrade of the kubernetes version on a given cluster`
+	upgradeExample = `
+	# Full example
+	vultr-cli kubernetes upgrades start d4908765-b82a-4e7d-83d9-c0bc4c6a36d0 --version="v1.23.5+3"
+
+	# Shortened with alias commands
+	vultr-cli k e s d4908765-b82a-4e7d-83d9-c0bc4c6a36d0 -v="v1.23.5+3"
 	`
 
 	nodepoolLong    = `Get all available commands for Kubernetes node pools`
@@ -217,6 +244,20 @@ func Kubernetes() *cobra.Command {
 	k8Update.Flags().StringP("label", "l", "", "label for your kubernetes cluster")
 	k8Update.MarkFlagRequired("label")
 
+	// Sub command for upgrade functions
+	k8UpgradeCmd := &cobra.Command{
+		Use:     "upgrades",
+		Aliases: []string{"upgrade", "e"},
+		Short:   `upgrade commands for kubernetes version upgrades`,
+		Long:    upgradesLong,
+		Example: upgradesExample,
+	}
+
+	k8UpgradeCmd.AddCommand(k8Upgrade, k8GetUpgrades)
+	k8Upgrade.Flags().StringP("version", "v", "", "the version to upgrade the cluster to")
+	k8Upgrade.MarkFlagRequired("version")
+	kubernetesCmd.AddCommand(k8UpgradeCmd)
+
 	// Node Pools SubCommands
 	nodepoolsCmd := &cobra.Command{
 		Use:     "node-pool",
@@ -455,6 +496,47 @@ var k8GetVersions = &cobra.Command{
 	},
 }
 
+var k8GetUpgrades = &cobra.Command{
+	Use:     "list <clusterID>",
+	Short:   "gets available upgrades for a cluster",
+	Long:    getUpgradesLong,
+	Example: getUpgradesExample,
+	Aliases: []string{"l"},
+	Run: func(cmd *cobra.Command, args []string) {
+		id := args[0]
+		upgrades, err := client.Kubernetes.GetUpgrades(context.Background(), id)
+		if err != nil {
+			fmt.Printf("error retrieving available upgrades : %v\n", err)
+			os.Exit(1)
+		}
+
+		printer.K8Upgrades(upgrades)
+	},
+}
+
+var k8Upgrade = &cobra.Command{
+	Use:     "start <clusterID>",
+	Short:   "perform upgrade on a cluster",
+	Long:    upgradeLong,
+	Example: upgradeExample,
+	Aliases: []string{"s"},
+	Run: func(cmd *cobra.Command, args []string) {
+		id := args[0]
+		version, _ := cmd.Flags().GetString("version")
+
+		options := &govultr.ClusterUpgradeReq{
+			UpgradeVersion: version,
+		}
+
+		if err := client.Kubernetes.Upgrade(context.Background(), id, options); err != nil {
+			fmt.Printf("error performing cluster upgrade : %v\n", err)
+			os.Exit(1)
+		}
+
+		fmt.Println("kubernetes cluster upgrade has been initiated")
+	},
+}
+
 var npCreate = &cobra.Command{
 	Use:     "create <clusterID>",
 	Short:   "creates a node pool in a kubernetes cluster",
@@ -722,7 +804,7 @@ func formatNodePools(nodePools []string) ([]govultr.NodePoolReq, error) {
 			case field == "max-nodes":
 				v, err := strconv.Atoi(val)
 				if err != nil {
-					return nil, fmt.Errorf("invalid value for node pool max-nodes: %v", err)
+					return nil, fmt.Errorf("invalid value for max-nodes: %v", err)
 				}
 				np.MaxNodes = v
 			}

cmd/printer/kubernetes.go

@@ -150,3 +150,12 @@ func K8Versions(versions *govultr.Versions) {
 
 	flush()
 }
+
+func K8Upgrades(upgrades []string) {
+	display(columns{"UPGRADES"})
+	for _, v := range upgrades {
+		display(columns{v})
+	}
+
+	flush()
+}