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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| package skip | ||
|
|
||
| import ( | ||
| "reflect" | ||
| "slices" | ||
| "strings" | ||
| ) | ||
|
|
||
| // CanSkipExternalRequest checks if the external request can be skipped based on the plan and state. | ||
| // Two of the same objects are supplied as parameters, together with the operation that is being performed. | ||
| // The function uses the `skip_on` struct tag to determine if the field should be skipped. | ||
| // The value of the `skip_on` tag is a comma-separated list of operations that mean that changes to this field value do not require an external request and are in state only. | ||
| // The function will return true if the external request can be skipped, false otherwise. | ||
| func CanSkipExternalRequest[T any](a, b T, operation string) bool { | ||
| valA := reflect.ValueOf(a) | ||
| valB := reflect.ValueOf(b) | ||
|
|
||
| // Since we are using generics, we know that the types of a and b are the same. | ||
| // Therefore we can check the type of a to determine if it is a struct. | ||
| if valA.Kind() != reflect.Struct { | ||
| return false | ||
| } | ||
|
|
||
| typeOfA := valA.Type() | ||
| // iterate over all fields of the struct | ||
| for i := 0; i < typeOfA.NumField(); i++ { | ||
| field := typeOfA.Field(i) | ||
| // Check if the field has the skip_on tag | ||
| // If it doesn't we need to compare the valued as we cannot determine if the field should be skipped. | ||
| // If the field has the skip_on tag, we can check if the operation is in the list of operations that should be skipped. | ||
| tag := field.Tag.Get("skip_on") | ||
| if tag != "" { | ||
| // Split the tag values by comma and check if the operation is in the list. | ||
| // If the operation is in the list, then this field represents a change in state only | ||
| // and does not require an external request to be made. | ||
| // Therefore we can skip tp the next field. | ||
| tagValues := strings.Split(tag, ",") | ||
| if slices.Contains(tagValues, operation) { | ||
| continue | ||
| } | ||
| } | ||
|
|
||
| // If we get here then we need to compare the field values. | ||
| // By now we have determined that the struct fields do not have a valid skip value for this operation. | ||
| // Therefore if the field values are not equal, then the external request cannot be skipped. | ||
| fieldA := valA.Field(i) | ||
| fieldB := valB.Field(i) | ||
|
|
||
| if !fieldA.IsValid() || !fieldB.IsValid() { | ||
| return false | ||
| } | ||
| if !reflect.DeepEqual(fieldA.Interface(), fieldB.Interface()) { | ||
| return false | ||
| } | ||
| } | ||
| return true | ||
| } |
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