istio.io/istio@v0.0.0-20240520182934-d79c90f27776/istioctl/pkg/proxyconfig/clusters.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package proxyconfig
    16  
    17  import (
    18  	"context"
    19  	"encoding/json"
    20  	"fmt"
    21  	"io"
    22  	"text/tabwriter"
    23  
    24  	"github.com/spf13/cobra"
    25  
    26  	"istio.io/istio/istioctl/pkg/cli"
    27  	"istio.io/istio/istioctl/pkg/clioptions"
    28  	"istio.io/istio/pkg/cluster"
    29  )
    30  
    31  // TODO move to multicluster package; requires exposing some private funcs/vars in this package
    32  func ClustersCommand(ctx cli.Context) *cobra.Command {
    33  	var opts clioptions.ControlPlaneOptions
    34  	cmd := &cobra.Command{
    35  		Use:   "remote-clusters",
    36  		Short: "Lists the remote clusters each istiod instance is connected to.",
    37  		RunE: func(cmd *cobra.Command, args []string) error {
    38  			kubeClient, err := ctx.CLIClientWithRevision(opts.Revision)
    39  			if err != nil {
    40  				return err
    41  			}
    42  			res, err := kubeClient.AllDiscoveryDo(context.Background(), ctx.IstioNamespace(), "debug/clusterz")
    43  			if err != nil {
    44  				return err
    45  			}
    46  			return writeMulticlusterStatus(cmd.OutOrStdout(), res)
    47  		},
    48  	}
    49  	opts.AttachControlPlaneFlags(cmd)
    50  	return cmd
    51  }
    52  
    53  func writeMulticlusterStatus(out io.Writer, input map[string][]byte) error {
    54  	statuses, err := parseClusterStatuses(input)
    55  	if err != nil {
    56  		return err
    57  	}
    58  	w := new(tabwriter.Writer).Init(out, 0, 8, 5, ' ', 0)
    59  	_, _ = fmt.Fprintln(w, "NAME\tSECRET\tSTATUS\tISTIOD")
    60  	for istiod, clusters := range statuses {
    61  		for _, c := range clusters {
    62  			_, _ = fmt.Fprintf(w, "%s\t%s\t%s\t%s\n", c.ID, c.SecretName, c.SyncStatus, istiod)
    63  		}
    64  	}
    65  	_ = w.Flush()
    66  	return nil
    67  }
    68  
    69  func parseClusterStatuses(input map[string][]byte) (map[string][]cluster.DebugInfo, error) {
    70  	statuses := make(map[string][]cluster.DebugInfo, len(input))
    71  	for istiodKey, bytes := range input {
    72  		var parsed []cluster.DebugInfo
    73  		if err := json.Unmarshal(bytes, &parsed); err != nil {
    74  			return nil, err
    75  		}
    76  		statuses[istiodKey] = parsed
    77  	}
    78  	return statuses, nil
    79  }