74 lines
2.0 KiB
Go
74 lines
2.0 KiB
Go
// Copyright (c) 2016 Tigera, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package numorstring
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strconv"
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"strings"
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)
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type ASNumber uint32
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// ASNumberFromString creates an ASNumber struct from a string value. The
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// string value may simply be a number or may be the ASN in dotted notation.
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func ASNumberFromString(s string) (ASNumber, error) {
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if num, err := strconv.ParseUint(s, 10, 32); err == nil {
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return ASNumber(num), nil
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}
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parts := strings.Split(s, ".")
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if len(parts) != 2 {
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msg := fmt.Sprintf("invalid AS Number format (%s)", s)
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return 0, errors.New(msg)
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}
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if num1, err := strconv.ParseUint(parts[0], 10, 16); err != nil {
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msg := fmt.Sprintf("invalid AS Number format (%s)", s)
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return 0, errors.New(msg)
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} else if num2, err := strconv.ParseUint(parts[1], 10, 16); err != nil {
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msg := fmt.Sprintf("invalid AS Number format (%s)", s)
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return 0, errors.New(msg)
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} else {
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return ASNumber((num1 << 16) + num2), nil
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}
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}
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// UnmarshalJSON implements the json.Unmarshaller uinterface.
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func (a *ASNumber) UnmarshalJSON(b []byte) error {
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if err := json.Unmarshal(b, (*uint32)(a)); err == nil {
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return nil
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} else {
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var s string
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if err := json.Unmarshal(b, &s); err != nil {
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return err
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}
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if v, err := ASNumberFromString(s); err != nil {
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return err
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} else {
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*a = v
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return nil
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}
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}
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}
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// String returns the string value, or the Itoa of the uint value.
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func (a ASNumber) String() string {
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return strconv.FormatUint(uint64(a), 10)
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}
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