/
diff.go
127 lines (110 loc) · 2.33 KB
/
diff.go
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package object
import (
"encoding/json"
"fmt"
"sort"
"k8s.io/klog"
)
func printDiff(oldv, newv map[string]string, printer func(key, typ, oldv, newv string)) {
diff := make(map[string][]string)
for k, v := range newv {
if _, ok := oldv[k]; !ok {
diff[k] = []string{"n", "", v}
}
}
for k, v := range oldv {
if _, ok := newv[k]; !ok {
diff[k] = []string{"o", v, ""}
} else if v != newv[k] {
diff[k] = []string{"c", v, newv[k]}
}
}
if len(diff) == 0 {
return
}
keys := make([]string, len(diff))
i := 0
for k := range diff {
keys[i] = k
i += 1
}
sort.Strings(keys)
for _, k := range keys {
printer(k, diff[k][0], diff[k][1], diff[k][2])
}
return
}
func pairs(prefix string, o interface{}) (res map[string]string) {
res = map[string]string{}
switch t := o.(type) {
case nil:
res[prefix] = "nil"
case bool:
res[prefix] = fmt.Sprintf("%v", t)
case string:
res[prefix] = t
case int, int32, int64:
res[prefix] = fmt.Sprintf("%d", t)
case float32, float64:
res[prefix] = fmt.Sprintf("%f", t)
case map[string]interface{}:
if len(prefix) > 0 {
prefix += "."
}
for k, v := range t {
for a, b := range pairs(prefix+k, v) {
res[a] = b
}
}
case []interface{}:
if len(prefix) > 0 {
prefix += "."
}
for i, e := range t {
for a, b := range pairs(fmt.Sprintf("%s%d", prefix, i), e) {
res[a] = b
}
}
default:
klog.Errorf("unknown %T\n", t)
}
return
}
func convertToMap(o interface{}) (res map[string]string, err error) {
var b []byte
b, err = json.Marshal(o)
if err != nil {
return
}
out := make(map[string]interface{})
err = json.Unmarshal(b, &out)
if err != nil {
return
}
res = pairs("", out)
return
}
func DiffString(old_o, new_o interface{}) (string, error) {
res0, err := convertToMap(old_o)
if err != nil {
return "", fmt.Errorf("unable to convert to map the old object: %s", err)
}
res1, err := convertToMap(new_o)
if err != nil {
return "", fmt.Errorf("unable to convert to map the new object: %s", err)
}
sep := ""
s := ""
printDiff(res0, res1, func(key, typ, oldv, newv string) {
switch typ {
case "n":
s += fmt.Sprintf("%sadded:%s=%q", sep, key, newv)
case "o":
s += fmt.Sprintf("%sremoved:%s=%q", sep, key, oldv)
case "c":
s += fmt.Sprintf("%schanged:%s={%q -> %q}", sep, key, oldv, newv)
}
sep = ", "
})
return s, nil
}