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diff.go
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diff.go
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package k8sutil
import (
"fmt"
"strings"
"k8s.io/client-go/util/jsonpath"
"k8s.io/kubectl/pkg/cmd/get"
"github.com/kubeshop/botkube/internal/source/kubernetes/config"
"github.com/kubeshop/botkube/pkg/multierror"
)
// Diff provides differences between two objects.
func Diff(x, y interface{}, updateSetting config.UpdateSetting) (string, error) {
strBldr := new(strings.Builder)
errs := multierror.New()
for _, val := range updateSetting.Fields {
var d diffReporter
d.field = val
diff, err := d.exec(x, y)
if err != nil {
errs = multierror.Append(errs, err)
continue
}
strBldr.WriteString(diff)
}
if errs.ErrorOrNil() != nil {
return strBldr.String(), fmt.Errorf("while getting diff: %w", errs.ErrorOrNil())
}
return strBldr.String(), nil
}
type diffReporter struct {
field string
}
func (d diffReporter) exec(x, y interface{}) (string, error) {
vx, err := parseJsonpath(x, d.field)
if err != nil {
return "", fmt.Errorf("while finding value in old obj from jsonpath %q: %w", d.field, err)
}
vy, err := parseJsonpath(y, d.field)
if err != nil {
return "", fmt.Errorf("while finding value in new obj from jsonpath %q: %w", d.field, err)
}
// treat <none> and false as same fields
if vx == vy || (vx == "<none>" && vy == "false") {
return "", nil
}
return fmt.Sprintf("%s:\n\t-: %+v\n\t+: %+v\n", d.field, vx, vy), nil
}
func parseJsonpath(obj interface{}, jsonpathStr string) (string, error) {
// Parse and print jsonpath
fields, err := get.RelaxedJSONPathExpression(jsonpathStr)
if err != nil {
return "", err
}
j := jsonpath.New("jsonpath")
j.AllowMissingKeys(true)
if err := j.Parse(fields); err != nil {
return "", err
}
values, err := j.FindResults(obj)
if err != nil {
return "", err
}
var valueStrings []string
if len(values) == 0 || len(values[0]) == 0 {
valueStrings = append(valueStrings, "<none>")
}
for arrIx := range values {
for valIx := range values[arrIx] {
valueStrings = append(valueStrings, fmt.Sprintf("%v", values[arrIx][valIx].Interface()))
}
}
return strings.Join(valueStrings, ","), nil
}