istioctl/pkg/writer/compare/cluster.go

// Copyright Istio 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 compare

import (
	"bytes"
	"fmt"
)

import (
	"github.com/pmezard/go-difflib/difflib"
)

import (
	"github.com/apache/dubbo-go-pixiu/pkg/util/protomarshal"
)

// ClusterDiff prints a diff between Istiod and Envoy clusters to the passed writer
func (c *Comparator) ClusterDiff() error {
	envoyBytes, istiodBytes := &bytes.Buffer{}, &bytes.Buffer{}
	envoyClusterDump, err := c.envoy.GetDynamicClusterDump(true)
	if err != nil {
		envoyBytes.WriteString(err.Error())
	} else {
		envoy, err := protomarshal.ToJSONWithIndent(envoyClusterDump, "    ")
		if err != nil {
			return err
		}
		envoyBytes.WriteString(envoy)
	}
	istiodClusterDump, err := c.istiod.GetDynamicClusterDump(true)
	if err != nil {
		istiodBytes.WriteString(err.Error())
	} else {
		istiod, err := protomarshal.ToJSONWithIndent(istiodClusterDump, "    ")
		if err != nil {
			return err
		}
		istiodBytes.WriteString(istiod)
	}
	diff := difflib.UnifiedDiff{
		FromFile: "Istiod Clusters",
		A:        difflib.SplitLines(istiodBytes.String()),
		ToFile:   "Envoy Clusters",
		B:        difflib.SplitLines(envoyBytes.String()),
		Context:  c.context,
	}
	text, err := difflib.GetUnifiedDiffString(diff)
	if err != nil {
		return err
	}
	if text != "" {
		fmt.Fprintln(c.w, text)
	} else {
		fmt.Fprintln(c.w, "Clusters Match")
	}
	return nil
}