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35a76969b3
It seems something like StructFields is more generally useful, so this moves it to jsontuil so it can be reused.
67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2017 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package jsonutil
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import (
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"encoding/json"
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"fmt"
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"io"
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"reflect"
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"strings"
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"github.com/snapcore/snapd/strutil"
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)
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// DecodeWithNumber decodes input data using json.Decoder, ensuring numbers are preserved
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// via json.Number data type. It errors out on invalid json or any excess input.
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func DecodeWithNumber(r io.Reader, value interface{}) error {
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dec := json.NewDecoder(r)
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dec.UseNumber()
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if err := dec.Decode(&value); err != nil {
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return err
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}
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if dec.More() {
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return fmt.Errorf("cannot parse json value")
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}
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return nil
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}
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// StructFields takes a pointer to a struct and a list of exceptions,
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// and returns a list of the fields in the struct that are JSON-tagged
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// and whose tag is not in the list of exceptions.
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// The struct can be nil.
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func StructFields(s interface{}, exceptions ...string) []string {
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st := reflect.TypeOf(s).Elem()
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num := st.NumField()
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fields := make([]string, 0, num)
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for i := 0; i < num; i++ {
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tag := st.Field(i).Tag.Get("json")
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idx := strings.IndexByte(tag, ',')
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if idx > -1 {
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tag = tag[:idx]
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}
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if tag != "" && !strutil.ListContains(exceptions, tag) {
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fields = append(fields, tag)
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}
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}
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return fields
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}
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