github.com/Ilhicas/nomad@v1.0.4-0.20210304152020-e86851182bc3/command/namespace_list.go (about)

     1  package command
     2  
     3  import (
     4  	"fmt"
     5  	"sort"
     6  	"strings"
     7  
     8  	"github.com/hashicorp/nomad/api"
     9  	"github.com/posener/complete"
    10  )
    11  
    12  type NamespaceListCommand struct {
    13  	Meta
    14  }
    15  
    16  func (c *NamespaceListCommand) Help() string {
    17  	helpText := `
    18  Usage: nomad namespace list [options]
    19  
    20    List is used to list available namespaces.
    21  
    22    If ACLs are enabled, this command requires a management ACL token to view
    23    all namespaces. A non-management token can be used to list namespaces for
    24    which it has an associated capability.
    25  
    26  General Options:
    27  
    28    ` + generalOptionsUsage(usageOptsDefault|usageOptsNoNamespace) + `
    29  
    30  List Options:
    31  
    32    -json
    33      Output the namespaces in a JSON format.
    34  
    35    -t
    36      Format and display the namespaces using a Go template.
    37  `
    38  	return strings.TrimSpace(helpText)
    39  }
    40  
    41  func (c *NamespaceListCommand) AutocompleteFlags() complete.Flags {
    42  	return mergeAutocompleteFlags(c.Meta.AutocompleteFlags(FlagSetClient),
    43  		complete.Flags{
    44  			"-json": complete.PredictNothing,
    45  			"-t":    complete.PredictAnything,
    46  		})
    47  }
    48  
    49  func (c *NamespaceListCommand) AutocompleteArgs() complete.Predictor {
    50  	return complete.PredictNothing
    51  }
    52  
    53  func (c *NamespaceListCommand) Synopsis() string {
    54  	return "List namespaces"
    55  }
    56  
    57  func (c *NamespaceListCommand) Name() string { return "namespace list" }
    58  
    59  func (c *NamespaceListCommand) Run(args []string) int {
    60  	var json bool
    61  	var tmpl string
    62  
    63  	flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
    64  	flags.Usage = func() { c.Ui.Output(c.Help()) }
    65  	flags.BoolVar(&json, "json", false, "")
    66  	flags.StringVar(&tmpl, "t", "", "")
    67  
    68  	if err := flags.Parse(args); err != nil {
    69  		return 1
    70  	}
    71  
    72  	// Check that we got no arguments
    73  	args = flags.Args()
    74  	if l := len(args); l != 0 {
    75  		c.Ui.Error("This command takes no arguments")
    76  		c.Ui.Error(commandErrorText(c))
    77  		return 1
    78  	}
    79  
    80  	// Get the HTTP client
    81  	client, err := c.Meta.Client()
    82  	if err != nil {
    83  		c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
    84  		return 1
    85  	}
    86  
    87  	namespaces, _, err := client.Namespaces().List(nil)
    88  	if err != nil {
    89  		c.Ui.Error(fmt.Sprintf("Error retrieving namespaces: %s", err))
    90  		return 1
    91  	}
    92  
    93  	if json || len(tmpl) > 0 {
    94  		out, err := Format(json, tmpl, namespaces)
    95  		if err != nil {
    96  			c.Ui.Error(err.Error())
    97  			return 1
    98  		}
    99  
   100  		c.Ui.Output(out)
   101  		return 0
   102  	}
   103  
   104  	c.Ui.Output(formatNamespaces(namespaces))
   105  	return 0
   106  }
   107  
   108  func formatNamespaces(namespaces []*api.Namespace) string {
   109  	if len(namespaces) == 0 {
   110  		return "No namespaces found"
   111  	}
   112  
   113  	// Sort the output by namespace name
   114  	sort.Slice(namespaces, func(i, j int) bool { return namespaces[i].Name < namespaces[j].Name })
   115  
   116  	rows := make([]string, len(namespaces)+1)
   117  	rows[0] = "Name|Description"
   118  	for i, ns := range namespaces {
   119  		rows[i+1] = fmt.Sprintf("%s|%s",
   120  			ns.Name,
   121  			ns.Description)
   122  	}
   123  	return formatList(rows)
   124  }