111 lines
2.7 KiB
Go
111 lines
2.7 KiB
Go
/*
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Copyright 2023 The Flux authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cmp
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import (
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"fmt"
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"reflect"
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"strings"
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"github.com/google/go-cmp/cmp"
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)
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// SimpleUnstructuredReporter is a simple reporter for Unstructured objects
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// that only records differences detected during comparison, in a diff-like
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// format.
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type SimpleUnstructuredReporter struct {
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path cmp.Path
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diffs []string
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}
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// Report writes a diff entry if rs is not equal. In the format of:
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//
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// .spec.replicas
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// -3
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// +1
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//
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// .spec.template.spec.containers.[0].command.[6]
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// ---deleted=true
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//
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// .spec.template.spec.containers.[0].env.[?->1]
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// +map[name:ADDED]
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func (r *SimpleUnstructuredReporter) Report(rs cmp.Result) {
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if !rs.Equal() {
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vx, vy := r.path.Last().Values()
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isNonEmptyX := isValidAndNonEmpty(vx)
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isNonEmptyY := isValidAndNonEmpty(vy)
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if !isNonEmptyX && !isNonEmptyY {
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// Skip empty values.
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return
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}
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var sb strings.Builder
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writePathString(r.path, &sb)
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sb.WriteString("\n")
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if isNonEmptyX {
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sb.WriteString(fmt.Sprintf("-%v", vx))
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sb.WriteString("\n")
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}
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if isNonEmptyY {
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sb.WriteString(fmt.Sprintf("+%v", vy))
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sb.WriteString("\n")
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}
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r.diffs = append(r.diffs, sb.String())
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}
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}
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// String returns the diff entries joined together with newline, trimmed from
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// spaces.
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func (r *SimpleUnstructuredReporter) String() string {
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return strings.TrimSpace(strings.Join(r.diffs, "\n"))
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}
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func (r *SimpleUnstructuredReporter) PushStep(ps cmp.PathStep) {
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r.path = append(r.path, ps)
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}
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func (r *SimpleUnstructuredReporter) PopStep() {
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r.path = r.path[:len(r.path)-1]
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}
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// https://github.com/istio/istio/blob/2caf81c64a2213dde39174a0a36cae530dc52b69/operator/pkg/compare/compare.go#L79
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func isValidAndNonEmpty(v reflect.Value) bool {
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if !v.IsValid() {
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return false
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}
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switch v.Kind() {
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case reflect.Interface:
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return isValidAndNonEmpty(v.Elem())
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case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice, reflect.String:
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return v.Len() > 0
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}
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return true
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}
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func writePathString(path cmp.Path, sb *strings.Builder) {
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for _, st := range path {
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switch t := st.(type) {
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case cmp.MapIndex:
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sb.WriteString(fmt.Sprintf(".%v", t.Key()))
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case cmp.SliceIndex:
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sb.WriteString(fmt.Sprintf("%v", t.String()))
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}
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}
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return
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}
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