mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-11-04 07:49:35 +00:00
122 lines
3.0 KiB
Go
122 lines
3.0 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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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 util
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"strings"
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"text/tabwriter"
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"github.com/davecgh/go-spew/spew"
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)
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// StringDiff diffs a and b and returns a human readable diff.
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func StringDiff(a, b string) string {
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ba := []byte(a)
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bb := []byte(b)
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out := []byte{}
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i := 0
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for ; i < len(ba) && i < len(bb); i++ {
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if ba[i] != bb[i] {
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break
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}
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out = append(out, ba[i])
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}
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out = append(out, []byte("\n\nA: ")...)
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out = append(out, ba[i:]...)
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out = append(out, []byte("\n\nB: ")...)
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out = append(out, bb[i:]...)
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out = append(out, []byte("\n\n")...)
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return string(out)
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}
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// ObjectDiff writes the two objects out as JSON and prints out the identical part of
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// the objects followed by the remaining part of 'a' and finally the remaining part of 'b'.
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// For debugging tests.
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func ObjectDiff(a, b interface{}) string {
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ab, err := json.Marshal(a)
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if err != nil {
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panic(fmt.Sprintf("a: %v", err))
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}
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bb, err := json.Marshal(b)
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if err != nil {
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panic(fmt.Sprintf("b: %v", err))
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}
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return StringDiff(string(ab), string(bb))
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}
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// ObjectGoPrintDiff is like ObjectDiff, but uses go-spew to print the objects,
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// which shows absolutely everything by recursing into every single pointer
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// (go's %#v formatters OTOH stop at a certain point). This is needed when you
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// can't figure out why reflect.DeepEqual is returning false and nothing is
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// showing you differences. This will.
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func ObjectGoPrintDiff(a, b interface{}) string {
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s := spew.ConfigState{DisableMethods: true}
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return StringDiff(
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s.Sprintf("%#v", a),
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s.Sprintf("%#v", b),
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)
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}
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// ObjectGoPrintSideBySide prints a and b as textual dumps side by side,
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// enabling easy visual scanning for mismatches.
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func ObjectGoPrintSideBySide(a, b interface{}) string {
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s := spew.ConfigState{
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Indent: " ",
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// Extra deep spew.
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DisableMethods: true,
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}
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sA := s.Sdump(a)
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sB := s.Sdump(b)
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linesA := strings.Split(sA, "\n")
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linesB := strings.Split(sB, "\n")
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width := 0
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for _, s := range linesA {
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l := len(s)
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if l > width {
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width = l
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}
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}
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for _, s := range linesB {
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l := len(s)
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if l > width {
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width = l
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}
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}
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buf := &bytes.Buffer{}
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w := tabwriter.NewWriter(buf, width, 0, 1, ' ', 0)
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max := len(linesA)
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if len(linesB) > max {
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max = len(linesB)
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}
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for i := 0; i < max; i++ {
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var a, b string
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if i < len(linesA) {
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a = linesA[i]
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}
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if i < len(linesB) {
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b = linesB[i]
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}
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fmt.Fprintf(w, "%s\t%s\n", a, b)
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}
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w.Flush()
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return buf.String()
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}
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