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patch.go
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patch.go
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package json
import (
"encoding/json"
"errors"
"github.com/mattbaird/jsonpatch"
)
// CreatePatch creates a patch as specified in http://jsonpatch.com/.
//
// 'before' is original, 'after' is the modified struct.
// The function will return the patch as byte array.
//
// An error will be returned if any of the two structs is nil.
func CreatePatch(before, after interface{}) ([]byte, error) {
if before == nil {
return nil, errors.New("'before' cannot be nil when creating a JSON patch")
}
if after == nil {
return nil, errors.New("'after' cannot be nil when creating a JSON patch")
}
rawBefore, rawAfter, err := marshallBeforeAfter(before, after)
if err != nil {
return nil, err
}
patch, err := jsonpatch.CreatePatch(rawBefore, rawAfter)
if err != nil {
return nil, err
}
jsonPatch, err := json.Marshal(patch)
if err != nil {
return nil, err
}
return jsonPatch, nil
}
func marshallBeforeAfter(before, after interface{}) ([]byte, []byte, error) {
rawBefore, err := json.Marshal(before)
if err != nil {
return nil, nil, err
}
rawAfter, err := json.Marshal(after)
if err != nil {
return rawBefore, nil, err
}
return rawBefore, rawAfter, nil
}
// Patch is a slice of JsonPatchOperations
type Patch []jsonpatch.JsonPatchOperation
// MarshalJSON converts the Patch into a byte array
func (p Patch) MarshalJSON() ([]byte, error) {
return json.Marshal([]jsonpatch.JsonPatchOperation(p))
}