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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package thrift
import (
"encoding/hex"
"fmt"
)
// Tuuid is a minimal implementation of UUID for thrift's read/write operations.
//
// This implementation only covers read/write in various thrift protocols.
// If you need to generate/manipulate/etc. an UUID,
// you likely would need a third party UUID library instead.
//
// This type should be directly cast-able with most popular third party UUID
// libraries.
// For example, assuming you are using
// https://pkg.go.dev/github.com/google/uuid to generate a v4 UUID for an
// optional thrift field:
//
// id, err := uuid.NewRandom()
// if err != nil {
// // TODO: handle errors
// }
// myRequest.Uuid = thrift.Pointer(thrift.Tuuid(id))
type Tuuid [16]byte
// String generates the canonical form string for an Tuuid.
//
// This string is suitable for writing with TJSONProtocol.
func (u Tuuid) String() string {
var buf [36]byte
hex.Encode(buf[0:], u[:4])
buf[8] = '-'
hex.Encode(buf[9:], u[4:6])
buf[13] = '-'
hex.Encode(buf[14:], u[6:8])
buf[18] = '-'
hex.Encode(buf[19:], u[8:10])
buf[23] = '-'
hex.Encode(buf[24:], u[10:])
return string(buf[:])
}
func hexToDec(b byte) (byte, bool) {
switch {
case b >= '0' && b <= '9':
return b - '0', true
case b >= 'a' && b <= 'f':
return b - 'a' + 10, true
case b >= 'A' && b <= 'F':
return b - 'A' + 10, true
default:
return 0, false
}
}
func hexToByte(b1, b2 byte) (b byte, ok bool) {
b1, ok = hexToDec(b1)
if !ok {
return 0, ok
}
b2, ok = hexToDec(b2)
if !ok {
return 0, ok
}
return b1<<4 + b2, true
}
// ParseTuuid parses a canonical form UUID string into Tuuid.
//
// Note that this function only supports case insensitive canonical form
// (8-4-4-4-12/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx),
// and rejects any other forms.
// For a more flexible UUID string parser,
// please use third party UUID libraries.
//
// This function is suitable for reading with TJSONProtocol.
func ParseTuuid(s string) (u Tuuid, err error) {
if len(s) != 36 || s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
return u, fmt.Errorf("malformed Tuuid string: %q", s)
}
var ok bool
for i, j := range []int{
0, 2, 4, 6,
9, 11,
14, 16,
19, 21,
24, 26, 28, 30, 32, 34,
} {
u[i], ok = hexToByte(s[j], s[j+1])
if !ok {
return u, fmt.Errorf("malformed Tuuid string: %q", s)
}
}
return u, nil
}
// Must is a sugar to be used in places that error handling is impossible (for
// example, global variable declarations) and also errors are not in general
// expected.
//
// This is an example to use Must with ParseTuuid to declare a global special
// uuid:
//
// var NameSpaceDNSUUID = thrift.Must(thrift.ParseTuuid("6ba7b810-9dad-11d1-80b4-00c04fd430c8"))
func Must[T any](v T, err error) T {
if err != nil {
panic(err)
}
return v
}
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