istio.io/istio@v0.0.0-20240520182934-d79c90f27776/istioctl/pkg/writer/ztunnel/configdump/services.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 configdump
    16  
    17  import (
    18  	"cmp"
    19  	"encoding/json"
    20  	"fmt"
    21  	"strings"
    22  
    23  	"sigs.k8s.io/yaml"
    24  
    25  	"istio.io/istio/pkg/maps"
    26  	"istio.io/istio/pkg/slices"
    27  )
    28  
    29  // ServiceFilter is used to pass filter information into service based config writer print functions
    30  type ServiceFilter struct {
    31  	Namespace string
    32  }
    33  
    34  // Verify returns true if the passed workload matches the filter fields
    35  func (wf *ServiceFilter) Verify(svc *ZtunnelService) bool {
    36  	if wf.Namespace != "" {
    37  		if !strings.EqualFold(svc.Namespace, wf.Namespace) {
    38  			return false
    39  		}
    40  	}
    41  
    42  	return true
    43  }
    44  
    45  // PrintServiceSummary prints a summary of the relevant services in the config dump to the ConfigWriter stdout
    46  func (c *ConfigWriter) PrintServiceSummary(filter ServiceFilter) error {
    47  	w := c.tabwriter()
    48  	zDump := c.ztunnelDump
    49  
    50  	svcs := slices.Filter(maps.Values(zDump.Services), filter.Verify)
    51  	slices.SortFunc(svcs, func(a, b *ZtunnelService) int {
    52  		if r := cmp.Compare(a.Namespace, b.Namespace); r != 0 {
    53  			return r
    54  		}
    55  		if r := cmp.Compare(a.Name, b.Name); r != 0 {
    56  			return r
    57  		}
    58  		return cmp.Compare(a.Hostname, b.Hostname)
    59  	})
    60  	fmt.Fprintln(w, "NAMESPACE\tSERVICE NAME\tSERVICE VIP\tWAYPOINT")
    61  
    62  	for _, svc := range svcs {
    63  		var ip string
    64  		if len(svc.Addresses) > 0 {
    65  			_, ip, _ = strings.Cut(svc.Addresses[0], "/")
    66  		}
    67  		waypoint := serviceWaypointName(svc, zDump.Services)
    68  		fmt.Fprintf(w, "%v\t%v\t%v\t%v\n",
    69  			svc.Namespace, svc.Name, ip, waypoint)
    70  	}
    71  	return w.Flush()
    72  }
    73  
    74  // PrintServiceDump prints the relevant services in the config dump to the ConfigWriter stdout
    75  func (c *ConfigWriter) PrintServiceDump(filter ServiceFilter, outputFormat string) error {
    76  	zDump := c.ztunnelDump
    77  	svcs := slices.Filter(maps.Values(zDump.Services), filter.Verify)
    78  	slices.SortFunc(svcs, func(a, b *ZtunnelService) int {
    79  		if r := cmp.Compare(a.Namespace, b.Namespace); r != 0 {
    80  			return r
    81  		}
    82  		if r := cmp.Compare(a.Name, b.Name); r != 0 {
    83  			return r
    84  		}
    85  		return cmp.Compare(a.Hostname, b.Hostname)
    86  	})
    87  	out, err := json.MarshalIndent(svcs, "", "    ")
    88  	if err != nil {
    89  		return fmt.Errorf("failed to marshal workloads: %v", err)
    90  	}
    91  	if outputFormat == "yaml" {
    92  		if out, err = yaml.JSONToYAML(out); err != nil {
    93  			return err
    94  		}
    95  	}
    96  	fmt.Fprintln(c.Stdout, string(out))
    97  	return nil
    98  }