Improve kubectl plugin

cmd/plugin/commands/ingresses/ingresses.go

@@ -0,0 +1,217 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package ingresses
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"os"
+	"text/tabwriter"
+
+	"k8s.io/api/extensions/v1beta1"
+	"k8s.io/cli-runtime/pkg/genericclioptions"
+
+	"k8s.io/ingress-nginx/cmd/plugin/request"
+	"k8s.io/ingress-nginx/cmd/plugin/util"
+)
+
+// CreateCommand creates and returns this cobra subcommand
+func CreateCommand(flags *genericclioptions.ConfigFlags) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:     "ingresses",
+		Aliases: []string{"ingress", "ing"},
+		Short:   "Provide a short summary of all of the ingress definitions",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			host, err := cmd.Flags().GetString("host")
+			if err != nil {
+				return err
+			}
+
+			allNamespaces, err := cmd.Flags().GetBool("all-namespaces")
+			if err != nil {
+				return err
+			}
+
+			util.PrintError(ingresses(flags, host, allNamespaces))
+			return nil
+		},
+	}
+	cmd.Flags().String("host", "", "Show just the ingress definitions for this hostname")
+	cmd.Flags().Bool("all-namespaces", false, "Find ingress definitions from all namespaces")
+
+	return cmd
+}
+
+func ingresses(flags *genericclioptions.ConfigFlags, host string, allNamespaces bool) error {
+	var namespace string
+	if allNamespaces {
+		namespace = ""
+	} else {
+		namespace = util.GetNamespace(flags)
+	}
+
+	ingresses, err := request.GetIngressDefinitions(flags, namespace)
+	if err != nil {
+		return err
+	}
+
+	rows := getIngressRows(&ingresses)
+
+	if host != "" {
+		rowsWithHost := make([]ingressRow, 0)
+		for _, row := range rows {
+			if row.Host == host {
+				rowsWithHost = append(rowsWithHost, row)
+			}
+		}
+		rows = rowsWithHost
+	}
+
+	printer := tabwriter.NewWriter(os.Stdout, 6, 4, 3, ' ', 0)
+	defer printer.Flush()
+
+	if allNamespaces {
+		fmt.Fprintln(printer, "NAMESPACE\tINGRESS NAME\tHOST+PATH\tADDRESSES\tTLS\tSERVICE\tSERVICE PORT\tENDPOINTS")
+	} else {
+		fmt.Fprintln(printer, "INGRESS NAME\tHOST+PATH\tADDRESSES\tTLS\tSERVICE\tSERVICE PORT\tENDPOINTS")
+	}
+
+	for _, row := range rows {
+		var tlsMsg string
+		if row.TLS {
+			tlsMsg = "YES"
+		} else {
+			tlsMsg = "NO"
+		}
+
+		numEndpoints, err := request.GetNumEndpoints(flags, row.Namespace, row.ServiceName)
+		if err != nil {
+			return err
+		}
+		if numEndpoints == nil {
+			row.NumEndpoints = "N/A"
+		} else {
+			row.NumEndpoints = fmt.Sprint(*numEndpoints)
+		}
+
+		if allNamespaces {
+			fmt.Fprintf(printer, "%v\t%v\t%v\t%v\t%v\t%v\t%v\t%v\n", row.Namespace, row.IngressName, row.Host+row.Path, row.Address, tlsMsg, row.ServiceName, row.ServicePort, row.NumEndpoints)
+		} else {
+			fmt.Fprintf(printer, "%v\t%v\t%v\t%v\t%v\t%v\t%v\n", row.IngressName, row.Host+row.Path, row.Address, tlsMsg, row.ServiceName, row.ServicePort, row.NumEndpoints)
+		}
+	}
+
+	return nil
+}
+
+type ingressRow struct {
+	Namespace    string
+	IngressName  string
+	Host         string
+	Path         string
+	TLS          bool
+	ServiceName  string
+	ServicePort  string
+	Address      string
+	NumEndpoints string
+}
+
+func getIngressRows(ingresses *[]v1beta1.Ingress) []ingressRow {
+	rows := make([]ingressRow, 0)
+
+	for _, ing := range *ingresses {
+
+		address := ""
+		for _, lbIng := range ing.Status.LoadBalancer.Ingress {
+			if len(lbIng.IP) > 0 {
+				address = address + lbIng.IP + ","
+			}
+			if len(lbIng.Hostname) > 0 {
+				address = address + lbIng.Hostname + ","
+			}
+		}
+		if len(address) > 0 {
+			address = address[:len(address)-1]
+		}
+
+		tlsHosts := make(map[string]struct{})
+		for _, tls := range ing.Spec.TLS {
+			for _, host := range tls.Hosts {
+				tlsHosts[host] = struct{}{}
+			}
+		}
+
+		defaultBackendService := ""
+		defaultBackendPort := ""
+		if ing.Spec.Backend != nil {
+			defaultBackendService = ing.Spec.Backend.ServiceName
+			defaultBackendPort = ing.Spec.Backend.ServicePort.String()
+		}
+
+		// Handle catch-all ingress
+		if len(ing.Spec.Rules) == 0 && len(defaultBackendService) > 0 {
+			row := ingressRow{
+				Namespace:   ing.Namespace,
+				IngressName: ing.Name,
+				Host:        "*",
+				ServiceName: defaultBackendService,
+				ServicePort: defaultBackendPort,
+				Address:     address,
+			}
+
+			rows = append(rows, row)
+			continue
+		}
+
+		for _, rule := range ing.Spec.Rules {
+			_, hasTLS := tlsHosts[rule.Host]
+
+			//Handle ingress with no paths
+			if rule.HTTP == nil {
+				row := ingressRow{
+					Namespace:   ing.Namespace,
+					IngressName: ing.Name,
+					Host:        rule.Host,
+					Path:        "",
+					TLS:         hasTLS,
+					ServiceName: defaultBackendService,
+					ServicePort: defaultBackendPort,
+					Address:     address,
+				}
+				rows = append(rows, row)
+				continue
+			}
+
+			for _, path := range rule.HTTP.Paths {
+				row := ingressRow{
+					Namespace:   ing.Namespace,
+					IngressName: ing.Name,
+					Host:        rule.Host,
+					Path:        path.Path,
+					TLS:         hasTLS,
+					ServiceName: path.Backend.ServiceName,
+					ServicePort: path.Backend.ServicePort.String(),
+					Address:     address,
+				}
+
+				rows = append(rows, row)
+			}
+		}
+	}
+
+	return rows
+}