istio.io/istio@v0.0.0-20240520182934-d79c90f27776/istioctl/pkg/writer/ztunnel/configdump/policies.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  // PolicyFilter is used to pass filter information into service based config writer print functions
    30  type PolicyFilter struct {
    31  	Namespace string
    32  }
    33  
    34  // Verify returns true if the passed workload matches the filter fields
    35  func (wf *PolicyFilter) Verify(pol *ZtunnelPolicy) bool {
    36  	if wf.Namespace != "" {
    37  		if !strings.EqualFold(pol.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) PrintPolicySummary(filter PolicyFilter) error {
    47  	w := c.tabwriter()
    48  	zDump := c.ztunnelDump
    49  
    50  	pols := slices.Filter(maps.Values(zDump.Policies), filter.Verify)
    51  	slices.SortFunc(pols, func(a, b *ZtunnelPolicy) int {
    52  		if r := cmp.Compare(a.Namespace, b.Namespace); r != 0 {
    53  			return r
    54  		}
    55  		return cmp.Compare(a.Name, b.Name)
    56  	})
    57  	fmt.Fprintln(w, "NAMESPACE\tPOLICY NAME\tACTION\tSCOPE")
    58  
    59  	for _, pol := range pols {
    60  		fmt.Fprintf(w, "%v\t%v\t%v\t%v\n",
    61  			pol.Namespace, pol.Name, pol.Action, pol.Scope)
    62  	}
    63  	return w.Flush()
    64  }
    65  
    66  // PrintPolicyDump prints the relevant services in the config dump to the ConfigWriter stdout
    67  func (c *ConfigWriter) PrintPolicyDump(filter PolicyFilter, outputFormat string) error {
    68  	zDump := c.ztunnelDump
    69  	policies := slices.Filter(maps.Values(zDump.Policies), filter.Verify)
    70  	slices.SortFunc(policies, func(a, b *ZtunnelPolicy) int {
    71  		if r := cmp.Compare(a.Namespace, b.Namespace); r != 0 {
    72  			return r
    73  		}
    74  		return cmp.Compare(a.Name, b.Name)
    75  	})
    76  	out, err := json.MarshalIndent(policies, "", "    ")
    77  	if err != nil {
    78  		return fmt.Errorf("failed to marshal policies: %v", err)
    79  	}
    80  	if outputFormat == "yaml" {
    81  		if out, err = yaml.JSONToYAML(out); err != nil {
    82  			return err
    83  		}
    84  	}
    85  	fmt.Fprintln(c.Stdout, string(out))
    86  	return nil
    87  }