istio.io/istio@v0.0.0-20240520182934-d79c90f27776/istioctl/pkg/writer/compare/route.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 compare
    16  
    17  import (
    18  	"bytes"
    19  	"fmt"
    20  	"time"
    21  
    22  	"github.com/pmezard/go-difflib/difflib"
    23  
    24  	"istio.io/istio/pkg/util/protomarshal"
    25  )
    26  
    27  // RouteDiff prints a diff between Istiod and Envoy routes to the passed writer
    28  func (c *Comparator) RouteDiff() error {
    29  	envoyBytes, istiodBytes := &bytes.Buffer{}, &bytes.Buffer{}
    30  	envoyRouteDump, err := c.envoy.GetDynamicRouteDump(true)
    31  	if err != nil {
    32  		envoyBytes.WriteString(err.Error())
    33  	} else {
    34  		envoy, err := protomarshal.ToJSONWithAnyResolver(envoyRouteDump, "    ", &envoyResolver)
    35  		if err != nil {
    36  			return err
    37  		}
    38  		envoyBytes.WriteString(envoy)
    39  	}
    40  	istiodRouteDump, err := c.istiod.GetDynamicRouteDump(true)
    41  	if err != nil {
    42  		istiodBytes.WriteString(err.Error())
    43  	} else {
    44  		istiod, err := protomarshal.ToJSONWithAnyResolver(istiodRouteDump, "    ", &envoyResolver)
    45  		if err != nil {
    46  			return err
    47  		}
    48  		istiodBytes.WriteString(istiod)
    49  	}
    50  	diff := difflib.UnifiedDiff{
    51  		FromFile: "Istiod Routes",
    52  		A:        difflib.SplitLines(istiodBytes.String()),
    53  		ToFile:   "Envoy Routes",
    54  		B:        difflib.SplitLines(envoyBytes.String()),
    55  		Context:  c.context,
    56  	}
    57  	text, err := difflib.GetUnifiedDiffString(diff)
    58  	if err != nil {
    59  		return err
    60  	}
    61  	lastUpdatedStr := ""
    62  	if lastUpdated, err := c.envoy.GetLastUpdatedDynamicRouteTime(); err != nil {
    63  		return err
    64  	} else if lastUpdated != nil {
    65  		loc, err := time.LoadLocation(c.location)
    66  		if err != nil {
    67  			loc, _ = time.LoadLocation("UTC")
    68  		}
    69  		lastUpdatedStr = fmt.Sprintf(" (RDS last loaded at %s)", lastUpdated.In(loc).Format(time.RFC1123))
    70  	}
    71  	if text != "" {
    72  		fmt.Fprintf(c.w, "Routes Don't Match%s\n", lastUpdatedStr)
    73  		fmt.Fprintln(c.w, text)
    74  	} else {
    75  		fmt.Fprintf(c.w, "Routes Match%s\n", lastUpdatedStr)
    76  	}
    77  	return nil
    78  }