updated "scaling policy info" with prefix search and auto-complete

command/scaling_policy_info.go

@@ -6,6 +6,9 @@ import (
 
 	"github.com/mitchellh/cli"
 	"github.com/posener/complete"
+
+	"github.com/hashicorp/nomad/api"
+	"github.com/hashicorp/nomad/api/contexts"
 )
 
 // Ensure ScalingPolicyInfoCommand satisfies the cli.Command interface.
@@ -54,6 +57,21 @@ func (s *ScalingPolicyInfoCommand) AutocompleteFlags() complete.Flags {
 		})
 }
 
+func (c *ScalingPolicyInfoCommand) AutocompleteArgs() complete.Predictor {
+	return complete.PredictFunc(func(a complete.Args) []string {
+		client, err := c.Meta.Client()
+		if err != nil {
+			return nil
+		}
+
+		resp, _, err := client.Search().PrefixSearch(a.Last, contexts.ScalingPolicies, nil)
+		if err != nil {
+			return []string{}
+		}
+		return resp.Matches[contexts.ScalingPolicies]
+	})
+}
+
 // Name returns the name of this command.
 func (s *ScalingPolicyInfoCommand) Name() string { return "scaling policy info" }
 
@@ -70,15 +88,6 @@ func (s *ScalingPolicyInfoCommand) Run(args []string) int {
 		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 {
@@ -86,17 +95,16 @@ func (s *ScalingPolicyInfoCommand) Run(args []string) int {
 		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
-	}
+	args = flags.Args()
 
-	// 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)
+	// Formatted list mode if no policy ID
+	if len(args) == 0 && (json || len(tmpl) > 0) {
+		policies, _, err := client.Scaling().ListPolicies(nil)
+		if err != nil {
+			s.Ui.Error(fmt.Sprintf("Error listing scaling policies: %v", err))
+			return 1
+		}
+		out, err := Format(json, tmpl, policies)
 		if err != nil {
 			s.Ui.Error(err.Error())
 			return 1
@@ -105,14 +113,65 @@ func (s *ScalingPolicyInfoCommand) Run(args []string) int {
 		return 0
 	}
 
+	if len(args) != 1 {
+		s.Ui.Error("This command takes one of the following argument conditions:")
+		s.Ui.Error(" * A single <policy_id>")
+		s.Ui.Error(" * No arguments, with output format specified")
+		s.Ui.Error(commandErrorText(s))
+		return 1
+	}
+	policyID := args[0]
+	if len(policyID) == 1 {
+		s.Ui.Error("Identifier must contain at least two characters.")
+		return 1
+	}
+
+	policyID = sanitizeUUIDPrefix(policyID)
+	policies, _, err := client.Scaling().ListPolicies(&api.QueryOptions{
+		Prefix: policyID,
+	})
+	if err != nil {
+		s.Ui.Error(fmt.Sprintf("Error querying scaling policy: %v", err))
+		return 1
+	}
+	if len(policies) == 0 {
+		s.Ui.Error(fmt.Sprintf("No scaling policies with prefix or id %q found", policyID))
+		return 1
+	}
+	if len(policies) > 1 {
+		out := formatScalingPolicies(policies)
+		s.Ui.Output(fmt.Sprintf("Prefix matched multiple scaling policies\n\n%s", out))
+		return 0
+	}
+
+	policy, _, err := client.Scaling().GetPolicy(policies[0].ID, nil)
+	if err != nil {
+		s.Ui.Error(fmt.Sprintf("Error querying scaling policy: %s", err))
+		return 1
+	}
+
+	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
+	out := "<empty>"
+	if len(policy.Policy) > 0 {
+		out, err = Format(true, "", policy.Policy)
+		if err != nil {
+			s.Ui.Error(err.Error())
+			return 1
+		}
 	}
 
 	info := []string{

command/scaling_policy_info_test.go

@@ -35,10 +35,10 @@ func TestScalingPolicyInfoCommand_Run(t *testing.T) {
 	cmd := &ScalingPolicyInfoCommand{Meta: Meta{Ui: ui}}
 
 	// Calling without the policyID should result in an error.
-	if code := cmd.Run([]string{"-address=" + url}); code != 1 {
+	if code := cmd.Run([]string{"-address=" + url, "first", "second"}); 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>") {
+	if out := ui.ErrorWriter.String(); !strings.Contains(out, "This command takes one of the following argument conditions") {
 		t.Fatalf("expected argument error within output: %v", out)
 	}
 
@@ -46,8 +46,8 @@ func TestScalingPolicyInfoCommand_Run(t *testing.T) {
 	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)
+	if out := ui.ErrorWriter.String(); !strings.Contains(out, `No scaling policies with prefix or id "scaling_policy_inf" found`) {
+		t.Fatalf("expected 'no policies found' within output: %v", out)
 	}
 
 	// Generate a test job.

command/scaling_policy_list.go

@@ -87,6 +87,7 @@ func (s *ScalingPolicyListCommand) Run(args []string) int {
 	if args = flags.Args(); len(args) > 0 {
 		s.Ui.Error("This command takes no arguments")
 		s.Ui.Error(commandErrorText(s))
+		return 1
 	}
 
 	// Get the HTTP client.
@@ -111,11 +112,6 @@ func (s *ScalingPolicyListCommand) Run(args []string) int {
 		return 1
 	}
 
-	if len(policies) == 0 {
-		s.Ui.Output("No policies found")
-		return 0
-	}
-
 	if json || len(tmpl) > 0 {
 		out, err := Format(json, tmpl, policies)
 		if err != nil {
@@ -126,23 +122,30 @@ func (s *ScalingPolicyListCommand) Run(args []string) int {
 		return 0
 	}
 
+	output := formatScalingPolicies(policies)
+	s.Ui.Output(output)
+	return 0
+}
+
+func formatScalingPolicies(stubs []*api.ScalingPolicyListStub) string {
+	if len(stubs) == 0 {
+		return "No policies found"
+	}
+
 	// Create the output table header.
-	output := []string{"ID|Enabled|Type|Target"}
+	policies := []string{"ID|Enabled|Type|Target"}
 
 	// Sort the list of policies based on their target.
-	sortedPolicies := scalingPolicyStubList{policies: policies}
+	sortedPolicies := scalingPolicyStubList{policies: stubs}
 	sort.Sort(sortedPolicies)
 
 	// Iterate the policies and add to the output.
 	for _, policy := range sortedPolicies.policies {
-		output = append(output, fmt.Sprintf(
+		policies = append(policies, fmt.Sprintf(
 			"%s|%v|%s|%s",
 			policy.ID, policy.Enabled, policy.Type, formatScalingPolicyTarget(policy.Target)))
 	}
-
-	// Output.
-	s.Ui.Output(formatList(output))
-	return 0
+	return formatList(policies)
 }
 
 // scalingPolicyStubList is a wrapper around []*api.ScalingPolicyListStub that