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diff.go
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diff.go
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package apparchive
import (
"bufio"
"bytes"
"strings"
"github.com/pkg/errors"
"github.com/sergi/go-diff/diffmatchpatch"
)
type Diff struct {
FilesChanged int `json:"filesChanged"`
LinesAdded int `json:"linesAdded"`
LinesRemoved int `json:"linesRemoved"`
}
func diffContent(baseContent string, updatedContent string) (int, int, error) {
dmp := diffmatchpatch.New()
charsA, charsB, lines := dmp.DiffLinesToChars(baseContent, updatedContent)
diffs := dmp.DiffMain(charsA, charsB, false)
diffs = dmp.DiffCharsToLines(diffs, lines)
additions := 0
deletions := 0
for _, diff := range diffs {
scanner := bufio.NewScanner(strings.NewReader(diff.Text))
for scanner.Scan() {
if diff.Type == diffmatchpatch.DiffDelete {
deletions++
} else if diff.Type == diffmatchpatch.DiffInsert {
additions++
}
}
}
return additions, deletions, nil
}
// DiffAppVersionsForDownstream will generate a diff of the rendered yaml between two different archive dirs
func DiffAppVersionsForDownstream(downstreamName string, archive string, diffBasePath string, kustomizeBinPath string) (*Diff, error) {
// diff kubernetes manifests
_, archiveFiles, err := GetRenderedApp(archive, downstreamName, kustomizeBinPath)
if err != nil {
return nil, errors.Wrap(err, "failed to get rendered app")
}
_, baseFiles, err := GetRenderedApp(diffBasePath, downstreamName, kustomizeBinPath)
if err != nil {
return nil, errors.Wrap(err, "failed to get base rendered app")
}
manifestsDiff, err := diffAppFiles(archiveFiles, baseFiles)
if err != nil {
return nil, errors.Wrap(err, "failed to diff app files")
}
// diff v1beta1 charts
_, archiveV1Beta1ChartFiles, err := GetRenderedV1Beta1ChartsArchive(archive, downstreamName, kustomizeBinPath)
if err != nil {
return nil, errors.Wrap(err, "failed to get rendered charts files")
}
_, baseV1Beta1ChartFiles, err := GetRenderedV1Beta1ChartsArchive(diffBasePath, downstreamName, kustomizeBinPath)
if err != nil {
return nil, errors.Wrap(err, "failed to get base rendered charts files")
}
v1Beta1ChartsDiff, err := diffAppFiles(archiveV1Beta1ChartFiles, baseV1Beta1ChartFiles)
if err != nil {
return nil, errors.Wrap(err, "failed to diff charts files")
}
// diff v1beta2 charts
archiveV1Beta2ChartFiles, err := GetRenderedV1Beta2FileMap(archive, downstreamName)
if err != nil {
return nil, errors.Wrap(err, "failed to get rendered charts files")
}
baseV1Beta2ChartFiles, err := GetRenderedV1Beta2FileMap(diffBasePath, downstreamName)
if err != nil {
return nil, errors.Wrap(err, "failed to get base rendered charts files")
}
v1Beta2ChartsDiff, err := diffAppFiles(archiveV1Beta2ChartFiles, baseV1Beta2ChartFiles)
if err != nil {
return nil, errors.Wrap(err, "failed to diff charts files")
}
totalDiff := &Diff{
FilesChanged: manifestsDiff.FilesChanged + v1Beta1ChartsDiff.FilesChanged + v1Beta2ChartsDiff.FilesChanged,
LinesAdded: manifestsDiff.LinesAdded + v1Beta1ChartsDiff.LinesAdded + v1Beta2ChartsDiff.LinesAdded,
LinesRemoved: manifestsDiff.LinesRemoved + v1Beta1ChartsDiff.LinesRemoved + v1Beta2ChartsDiff.LinesRemoved,
}
return totalDiff, nil
}
func diffAppFiles(archive map[string][]byte, base map[string][]byte) (*Diff, error) {
diff := Diff{}
for archiveFilename, archiveContents := range archive {
baseContents, ok := base[archiveFilename]
if !ok {
// this file was added
scanner := bufio.NewScanner(bytes.NewReader(archiveContents))
for scanner.Scan() {
diff.LinesAdded++
}
diff.FilesChanged++
continue
}
linesAdded, linesRemoved, err := diffContent(string(baseContents), string(archiveContents))
if err != nil {
return nil, errors.Wrapf(err, "failed to diff base and archive contents %s", archiveFilename)
}
diff.LinesAdded += linesAdded
diff.LinesRemoved += linesRemoved
if linesAdded > 0 || linesRemoved > 0 {
diff.FilesChanged++
}
}
for baseFilename, baseContents := range base {
_, ok := archive[baseFilename]
if !ok {
// this file was removed
scanner := bufio.NewScanner(bytes.NewReader(baseContents))
for scanner.Scan() {
diff.LinesRemoved++
}
diff.FilesChanged++
}
}
return &diff, nil
}