Introduce "orchard get worker" command (#127)

internal/command/get/get.go

@@ -18,6 +18,7 @@ func NewCommand() *cobra.Command {
 		newGetClusterSettingsCommand(),
 		newGetServiceAccountCommand(),
 		newGetVMCommand(),
+		newGetWorkerCommand(),
 	)
 
 	return command

internal/command/get/worker.go

@@ -0,0 +1,85 @@
+package get
+
+import (
+	"fmt"
+	"github.com/cirruslabs/orchard/internal/structpath"
+	"github.com/cirruslabs/orchard/pkg/client"
+	"github.com/dustin/go-humanize"
+	"github.com/gosuri/uitable"
+	"github.com/samber/lo"
+	"github.com/spf13/cobra"
+	"strings"
+	"time"
+)
+
+func newGetWorkerCommand() *cobra.Command {
+	command := &cobra.Command{
+		Use:   "worker NAME",
+		Short: "Retrieve a worker and it's fields",
+		RunE:  runGetWorker,
+		Args:  cobra.ExactArgs(1),
+	}
+
+	return command
+}
+
+func runGetWorker(cmd *cobra.Command, args []string) error {
+	name := args[0]
+
+	client, err := client.New()
+	if err != nil {
+		return err
+	}
+
+	// Ability to retrieve resource fields (e.g. "orchard get worker dev-mini/name")
+	splits := strings.Split(name, "/")
+	var path []string
+	if len(splits) > 1 {
+		name = splits[0]
+		path = splits[1:]
+	}
+
+	worker, err := client.Workers().Get(cmd.Context(), name)
+	if err != nil {
+		return err
+	}
+
+	// Ability to retrieve resource fields (e.g. "orchard get worker dev-mini/name")
+	if len(path) != 0 {
+		result, ok := structpath.Lookup(*worker, path)
+		if !ok {
+			return fmt.Errorf("%w: failed to find the specified field \"%s\" or the field is not a string",
+				ErrGetFailed, strings.Join(path, "/"))
+		}
+
+		fmt.Println(result)
+
+		return nil
+	}
+
+	table := uitable.New()
+
+	table.AddRow("Name", worker.Name)
+
+	createdAtInfo := humanize.RelTime(worker.CreatedAt, time.Now(), "ago", "in the future")
+	table.AddRow("Created", createdAtInfo)
+
+	lastSeenInfo := humanize.RelTime(worker.LastSeen, time.Now(), "ago", "in the future")
+	table.AddRow("Last seen", lastSeenInfo)
+
+	table.AddRow("Machine ID", worker.MachineID)
+	table.AddRow("Scheduling paused", worker.SchedulingPaused)
+
+	var resourcesInfo string
+	if len(worker.Resources) != 0 {
+		resourceDescriptions := lo.MapToSlice(worker.Resources, func(key string, value uint64) string {
+			return fmt.Sprintf("%s: %d", key, value)
+		})
+		resourcesInfo = strings.Join(resourceDescriptions, "\n")
+	}
+	table.AddRow("Resources", nonEmptyOrNone(resourcesInfo))
+
+	fmt.Println(table)
+
+	return nil
+}