cli: add policy list and info to new scaling cmd.

command/commands.go

@@ -618,6 +618,26 @@ func Commands(metaPtr *Meta, agentUi cli.Ui) map[string]cli.CommandFactory {
 				Meta: meta,
 			}, nil
 		},
+		"scaling": func() (cli.Command, error) {
+			return &ScalingCommand{
+				Meta: meta,
+			}, nil
+		},
+		"scaling policy": func() (cli.Command, error) {
+			return &ScalingPolicyCommand{
+				Meta: meta,
+			}, nil
+		},
+		"scaling policy info": func() (cli.Command, error) {
+			return &ScalingPolicyInfoCommand{
+				Meta: meta,
+			}, nil
+		},
+		"scaling policy list": func() (cli.Command, error) {
+			return &ScalingPolicyListCommand{
+				Meta: meta,
+			}, nil
+		},
 		"sentinel": func() (cli.Command, error) {
 			return &SentinelCommand{
 				Meta: meta,

command/scaling.go

@@ -0,0 +1,38 @@
+package command
+
+import (
+	"strings"
+
+	"github.com/mitchellh/cli"
+)
+
+// Ensure ScalingCommand satisfies the cli.Command interface.
+var _ cli.Command = &ScalingCommand{}
+
+// ScalingCommand implements cli.Command.
+type ScalingCommand struct {
+	Meta
+}
+
+// Help satisfies the cli.Command Help function.
+func (s *ScalingCommand) Help() string {
+	helpText := `
+Usage: nomad scaling <subcommand> [options]
+
+  This command groups subcommands for interacting with the scaling API.
+
+  Please see the individual subcommand help for detailed usage information.
+`
+	return strings.TrimSpace(helpText)
+}
+
+// Synopsis satisfies the cli.Command Synopsis function.
+func (s *ScalingCommand) Synopsis() string {
+	return "Interact with the Nomad scaling endpoint"
+}
+
+// Name returns the name of this command.
+func (s *ScalingCommand) Name() string { return "scaling" }
+
+// Run satisfies the cli.Command Run function.
+func (s *ScalingCommand) Run(_ []string) int { return cli.RunResultHelp }

command/scaling_policy.go

@@ -0,0 +1,79 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/mitchellh/cli"
+)
+
+// Ensure ScalingPolicyCommand satisfies the cli.Command interface.
+var _ cli.Command = &ScalingPolicyCommand{}
+
+// ScalingPolicyCommand implements cli.Command.
+type ScalingPolicyCommand struct {
+	Meta
+}
+
+// Help satisfies the cli.Command Help function.
+func (s *ScalingPolicyCommand) Help() string {
+	helpText := `
+Usage: nomad scaling policy <subcommand> [options]
+
+  This command groups subcommands for interacting with scaling policies. Scaling
+  policies can be used by an external autoscaler to perform scaling actions on
+  Nomad targets.
+
+  List policies:
+
+      $ nomad scaling policy list
+
+  Detail an individual scaling policy:
+
+      $ nomad scaling policy info <policy_id>
+
+  Please see the individual subcommand help for detailed usage information.
+`
+	return strings.TrimSpace(helpText)
+}
+
+// Synopsis satisfies the cli.Command Synopsis function.
+func (s *ScalingPolicyCommand) Synopsis() string {
+	return "Interact with Nomad scaling policies"
+}
+
+// Name returns the name of this command.
+func (s *ScalingPolicyCommand) Name() string { return "scaling policy" }
+
+// Run satisfies the cli.Command Run function.
+func (s *ScalingPolicyCommand) Run(_ []string) int { return cli.RunResultHelp }
+
+// formatScalingPolicyTarget is a command helper that correctly formats a
+// scaling policy target map into a command string output.
+func formatScalingPolicyTarget(t map[string]string) string {
+	var ns, j, g string
+	var other []string
+
+	for k, v := range t {
+
+		s := fmt.Sprintf("%s:%s", k, v)
+
+		switch strings.ToLower(k) {
+		case "namespace":
+			ns = s
+		case "job":
+			j = s
+		case "group":
+			g = s
+		default:
+			other = append(other, s)
+		}
+	}
+
+	out := []string{ns, j, g}
+
+	if len(other) > 0 {
+		out = append(out, other...)
+	}
+	return strings.Join(out, ",")
+}

command/scaling_policy_info.go

@@ -0,0 +1,126 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/mitchellh/cli"
+	"github.com/posener/complete"
+)
+
+// Ensure ScalingPolicyInfoCommand satisfies the cli.Command interface.
+var _ cli.Command = &ScalingPolicyInfoCommand{}
+
+// ScalingPolicyListCommand implements cli.Command.
+type ScalingPolicyInfoCommand struct {
+	Meta
+}
+
+// Help satisfies the cli.Command Help function.
+func (s *ScalingPolicyInfoCommand) Help() string {
+	helpText := `
+Usage: nomad scaling policy info [options] <policy_id>
+
+  Info is used to read the specified scaling policy.
+
+General Options:
+
+  ` + generalOptionsUsage() + `
+
+Policy Info Options:
+
+  -json
+    Output the scaling policy in its JSON format.
+
+  -t
+    Format and display the scaling policy using a Go template.
+`
+	return strings.TrimSpace(helpText)
+}
+
+// Synopsis satisfies the cli.Command Synopsis function.
+func (s *ScalingPolicyInfoCommand) Synopsis() string {
+	return "Display an individual Nomad scaling policy"
+}
+
+func (s *ScalingPolicyInfoCommand) AutocompleteFlags() complete.Flags {
+	return mergeAutocompleteFlags(s.Meta.AutocompleteFlags(FlagSetClient),
+		complete.Flags{
+			"-json": complete.PredictNothing,
+			"-t":    complete.PredictAnything,
+		})
+}
+
+// Name returns the name of this command.
+func (s *ScalingPolicyInfoCommand) Name() string { return "scaling policy info" }
+
+// Run satisfies the cli.Command Run function.
+func (s *ScalingPolicyInfoCommand) Run(args []string) int {
+	var json bool
+	var tmpl string
+
+	flags := s.Meta.FlagSet(s.Name(), FlagSetClient)
+	flags.Usage = func() { s.Ui.Output(s.Help()) }
+	flags.BoolVar(&json, "json", false, "")
+	flags.StringVar(&tmpl, "t", "", "")
+	if err := flags.Parse(args); err != nil {
+		return 1
+	}
+
+	if args = flags.Args(); len(args) != 1 {
+		s.Ui.Error("This command takes one argument: <policy_id>")
+		s.Ui.Error(commandErrorText(s))
+		return 1
+	}
+
+	// Get the policy ID.
+	policyID := args[0]
+
+	// Get the HTTP client.
+	client, err := s.Meta.Client()
+	if err != nil {
+		s.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
+		return 1
+	}
+
+	policy, _, err := client.Scaling().GetPolicy(policyID, nil)
+	if err != nil {
+		s.Ui.Error(fmt.Sprintf("Error listing scaling policies: %s", err))
+		return 1
+	}
+
+	// If the user has specified to output the policy as JSON or using a
+	// template then perform this action for the entire object and exit the
+	// command.
+	if json || len(tmpl) > 0 {
+		out, err := Format(json, tmpl, policy)
+		if err != nil {
+			s.Ui.Error(err.Error())
+			return 1
+		}
+		s.Ui.Output(out)
+		return 0
+	}
+
+	// Format the policy document which is a freeform map[string]interface{}
+	// and therefore can only be made pretty to a certain extent. Do this
+	// before the rest of the formatting so any errors are clearly passed back
+	// to the CLI.
+	out, err := Format(true, "", policy.Policy)
+	if err != nil {
+		s.Ui.Error(err.Error())
+		return 1
+	}
+
+	info := []string{
+		fmt.Sprintf("ID|%s", policy.ID),
+		fmt.Sprintf("Enabled|%v", *policy.Enabled),
+		fmt.Sprintf("Target|%s", formatScalingPolicyTarget(policy.Target)),
+		fmt.Sprintf("Min|%v", *policy.Min),
+		fmt.Sprintf("Max|%v", *policy.Max),
+	}
+	s.Ui.Output(formatKV(info))
+	s.Ui.Output("\nPolicy:")
+	s.Ui.Output(out)
+	return 0
+}

command/scaling_policy_info_test.go

@@ -0,0 +1,88 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/hashicorp/nomad/api"
+	"github.com/hashicorp/nomad/helper"
+	"github.com/hashicorp/nomad/testutil"
+	"github.com/mitchellh/cli"
+)
+
+func TestScalingPolicyInfoCommand_Run(t *testing.T) {
+	t.Parallel()
+	srv, client, url := testServer(t, true, nil)
+	defer srv.Shutdown()
+	testutil.WaitForResult(func() (bool, error) {
+		nodes, _, err := client.Nodes().List(nil)
+		if err != nil {
+			return false, err
+		}
+		if len(nodes) == 0 {
+			return false, fmt.Errorf("missing node")
+		}
+		if _, ok := nodes[0].Drivers["mock_driver"]; !ok {
+			return false, fmt.Errorf("mock_driver not ready")
+		}
+		return true, nil
+	}, func(err error) {
+		t.Fatalf("err: %s", err)
+	})
+
+	ui := cli.NewMockUi()
+	cmd := &ScalingPolicyInfoCommand{Meta: Meta{Ui: ui}}
+
+	// Calling without the policyID should result in an error.
+	if code := cmd.Run([]string{"-address=" + url}); code != 1 {
+		t.Fatalf("expected cmd run exit code 1, got: %d", code)
+	}
+	if out := ui.ErrorWriter.String(); !strings.Contains(out, "This command takes one argument: <policy_id>") {
+		t.Fatalf("expected argument error within output: %v", out)
+	}
+
+	// Perform an initial info, which should return zero results.
+	if code := cmd.Run([]string{"-address=" + url, "scaling_policy_info"}); code != 1 {
+		t.Fatalf("expected cmd run exit code 1, got: %d", code)
+	}
+	if out := ui.ErrorWriter.String(); !strings.Contains(out, "404 (policy not found)") {
+		t.Fatalf("expected 404 not found within output: %v", out)
+	}
+
+	// Generate a test job.
+	job := testJob("scaling_policy_info")
+
+	// Generate an example scaling policy.
+	job.TaskGroups[0].Scaling = &api.ScalingPolicy{
+		Enabled: helper.BoolToPtr(true),
+		Min:     helper.Int64ToPtr(1),
+		Max:     helper.Int64ToPtr(1),
+	}
+
+	// Register the job.
+	resp, _, err := client.Jobs().Register(job, nil)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	if code := waitForSuccess(ui, client, fullId, t, resp.EvalID); code != 0 {
+		t.Fatalf("expected waitForSuccess exit code 0, got: %d", code)
+	}
+
+	// Grab the generated policyID.
+	policies, _, err := client.Scaling().ListPolicies(nil)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	numPolicies := len(policies)
+	if numPolicies == 0 || numPolicies > 1 {
+		t.Fatalf("expected 1 policy return, got %v", numPolicies)
+	}
+
+	if code := cmd.Run([]string{"-address=" + url, policies[0].ID}); code != 0 {
+		t.Fatalf("expected cmd run exit code 0, got: %d", code)
+	}
+	if out := ui.OutputWriter.String(); !strings.Contains(out, "Policy:") {
+		t.Fatalf("expected policy ID within output: %v", out)
+	}
+}