feat: list command - improved output (#205)

Signed-off-by: Zbynek Roubalik <zroubali@redhat.com>

client.go

@@ -67,7 +67,15 @@ type Remover interface {
 // Lister of deployed services.
 type Lister interface {
 	// List the Functions currently deployed.
-	List() ([]string, error)
+	List() ([]ListItem, error)
+}
+
+type ListItem struct {
+	Name      string `json:"name" yaml:"name"`
+	Runtime   string `json:"runtime" yaml:"runtime"`
+	URL       string `json:"url" yaml:"url"`
+	KService  string `json:"kservice" yaml:"kservice"`
+	Ready     string `json:"ready" yaml:"ready"`
 }
 
 // ProgressListener is notified of task progress.
@@ -476,7 +484,7 @@ func (c *Client) Run(root string) error {
 }
 
 // List currently deployed Functions.
-func (c *Client) List() ([]string, error) {
+func (c *Client) List() ([]ListItem, error) {
 	// delegate to concrete implementation of lister entirely.
 	return c.lister.List()
 }
@@ -549,7 +557,7 @@ func (n *noopRemover) Remove(string) error { return nil }
 
 type noopLister struct{ output io.Writer }
 
-func (n *noopLister) List() ([]string, error) { return []string{}, nil }
+func (n *noopLister) List() ([]ListItem, error) { return []ListItem{}, nil }
 
 type noopDNSProvider struct{ output io.Writer }
 

cmd/completion_util.go

@@ -18,12 +18,15 @@ func CompleteFunctionList(cmd *cobra.Command, args []string, toComplete string)
 		directive = cobra.ShellCompDirectiveError
 		return
 	}
-	s, err := lister.List()
+	list, err := lister.List()
 	if err != nil {
 		directive = cobra.ShellCompDirectiveError
 		return
 	}
-	strings = s
+
+	for _, item := range list{
+		strings = append(strings, item.Name)
+	}
 	directive = cobra.ShellCompDirectiveDefault
 	return
 }

cmd/list.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"text/tabwriter"
 
 	"github.com/ory/viper"
 	"github.com/spf13/cobra"
@@ -54,12 +55,13 @@ func runList(cmd *cobra.Command, args []string) (err error) {
 		faas.WithVerbose(config.Verbose),
 		faas.WithLister(lister))
 
-	nn, err := client.List()
+	items, err := client.List()
 	if err != nil {
 		return
 	}
 
-	write(os.Stdout, names(nn), config.Format)
+	write(os.Stdout, listItems(items), config.Format)
+
 	return
 }
 
@@ -83,30 +85,33 @@ func newListConfig() listConfig {
 // Output Formatting (serializers)
 // -------------------------------
 
-type names []string
+type listItems []faas.ListItem
 
-func (nn names) Human(w io.Writer) error {
-	return nn.Plain(w)
+func (items listItems) Human(w io.Writer) error {
+	return items.Plain(w)
 }
 
-func (nn names) Plain(w io.Writer) error {
-	for _, name := range nn {
-		fmt.Fprintln(w, name)
+func (items listItems) Plain(w io.Writer) error {
+
+	// minwidth, tabwidth, padding, padchar, flags
+	tabWriter := tabwriter.NewWriter(w, 0, 8, 2, ' ', 0)
+	defer tabWriter.Flush()
+
+	fmt.Fprintf(tabWriter, "%s\t%s\t%s\t%s\t%s\n", "NAME", "RUNTIME", "URL", "KSERVICE", "READY")
+	for _, item := range items {
+		fmt.Fprintf(tabWriter, "%s\t%s\t%s\t%s\t%s\n", item.Name, item.Runtime, item.URL, item.KService, item.Ready)
 	}
 	return nil
 }
 
-func (nn names) JSON(w io.Writer) error {
-	return json.NewEncoder(w).Encode(nn)
+func (items listItems) JSON(w io.Writer) error {
+	return json.NewEncoder(w).Encode(items)
 }
 
-func (nn names) XML(w io.Writer) error {
-	return xml.NewEncoder(w).Encode(nn)
+func (items listItems) XML(w io.Writer) error {
+	return xml.NewEncoder(w).Encode(items)
 }
 
-func (nn names) YAML(w io.Writer) error {
-	// the yaml.v2 package refuses to directly serialize a []string unless
-	// exposed as a public struct member; so an inline anonymous is used.
-	ff := struct{ Names []string }{nn}
-	return yaml.NewEncoder(w).Encode(ff.Names)
+func (items listItems) YAML(w io.Writer) error {
+	return yaml.NewEncoder(w).Encode(items)
 }

go.mod

@@ -15,6 +15,7 @@ require (
 	k8s.io/client-go v11.0.1-0.20190805182717-6502b5e7b1b5+incompatible
 	knative.dev/client v0.17.2
 	knative.dev/eventing v0.17.5
+	knative.dev/pkg v0.0.0-20200831162708-14fb2347fb77
 	knative.dev/serving v0.17.3
 )
 

knative/lister.go

@@ -1,8 +1,11 @@
 package knative
 
 import (
+	corev1 "k8s.io/api/core/v1"
 	clientservingv1 "knative.dev/client/pkg/serving/v1"
+	"knative.dev/pkg/apis"
 
+	"github.com/boson-project/faas"
 	"github.com/boson-project/faas/k8s"
 )
 
@@ -28,7 +31,7 @@ func NewLister(namespaceOverride string) (l *Lister, err error) {
 	return
 }
 
-func (l *Lister) List() (names []string, err error) {
+func (l *Lister) List() (items []faas.ListItem, err error) {
 
 	client, err := NewServingClient(l.namespace)
 	if err != nil {
@@ -41,13 +44,32 @@ func (l *Lister) List() (names []string, err error) {
 	}
 
 	for _, service := range lst.Items {
+
 		// Convert the "subdomain-encoded" (i.e. kube-service-friendly) name
 		// back out to a fully qualified service name.
-		n, err := k8s.FromK8sAllowedName(service.Name)
+		name, err := k8s.FromK8sAllowedName(service.Name)
 		if err != nil {
-			return names, err
+			return items, err
 		}
-		names = append(names, n)
+
+		// get status
+		ready := corev1.ConditionUnknown
+		for _, con := range service.Status.Conditions {
+			if con.Type == apis.ConditionReady {
+				ready = con.Status
+				break
+			}
+		}
+
+		listItem := faas.ListItem{
+			Name:     name,
+			Runtime:  service.Labels["boson.dev/runtime"],
+			KService: service.Name,
+			URL:      service.Status.URL.String(),
+			Ready:    string(ready),
+		}
+
+		items = append(items, listItem)
 	}
 	return
 }

mock/lister.go

@@ -1,17 +1,19 @@
 package mock
 
+import "github.com/boson-project/faas"
+
 type Lister struct {
 	ListInvoked bool
-	ListFn      func() ([]string, error)
+	ListFn      func() ([]faas.ListItem, error)
 }
 
 func NewLister() *Lister {
 	return &Lister{
-		ListFn: func() ([]string, error) { return []string{}, nil },
+		ListFn: func() ([]faas.ListItem, error) { return []faas.ListItem{}, nil },
 	}
 }
 
-func (l *Lister) List() ([]string, error) {
+func (l *Lister) List() ([]faas.ListItem, error) {
 	l.ListInvoked = true
 	return l.ListFn()
 }