1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121

// OPCUA for Rust
// SPDX-License-Identifier: MPL-2.0
// Copyright (C) 2017-2022 Adam Lock

//! Contains the implementation of `Guid`.

use serde::{Deserialize, Deserializer, Serialize, Serializer};
use std::{
    fmt,
    io::{Read, Write},
    str::FromStr,
};
use uuid::Uuid;

use crate::encoding::*;

/// A Guid is a 16 byte Globally Unique Identifier.
#[derive(Eq, PartialEq, Clone, Hash)]
pub struct Guid {
    uuid: Uuid,
}

impl Serialize for Guid {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        self.uuid.to_string().serialize(serializer)
    }
}

impl<'de> Deserialize<'de> for Guid {
    fn deserialize<D>(deserializer: D) -> Result<Guid, D::Error>
    where
        D: Deserializer<'de>,
    {
        use serde::de::Error;

        let result = String::deserialize(deserializer);
        match result {
            Ok(uuid) => Uuid::parse_str(&uuid)
                .map(|uuid| Guid { uuid })
                .map_err(|_| D::Error::custom("Invalid uuid")),
            Err(err) => Err(err),
        }
    }
}

impl fmt::Display for Guid {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.uuid)
    }
}

impl fmt::Debug for Guid {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", self.uuid.to_hyphenated())
    }
}

impl BinaryEncoder<Guid> for Guid {
    fn byte_len(&self) -> usize {
        16
    }

    fn encode<S: Write>(&self, stream: &mut S) -> EncodingResult<usize> {
        let mut size: usize = 0;
        size += process_encode_io_result(stream.write(self.uuid.as_bytes()))?;
        Ok(size)
    }

    fn decode<S: Read>(stream: &mut S, _: &DecodingOptions) -> EncodingResult<Self> {
        let mut bytes = [0u8; 16];
        process_decode_io_result(stream.read_exact(&mut bytes))?;
        Ok(Guid {
            uuid: Uuid::from_bytes(bytes),
        })
    }
}

impl FromStr for Guid {
    type Err = ();

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Uuid::from_str(s).map(|uuid| Guid { uuid }).map_err(|err| {
            error!("Guid cannot be parsed from string, err = {:?}", err);
        })
    }
}

impl Default for Guid {
    fn default() -> Self {
        Guid::null()
    }
}

impl Guid {
    /// Return a null guid, i.e. 00000000-0000-0000-0000-000000000000
    pub fn null() -> Guid {
        Guid { uuid: Uuid::nil() }
    }

    /// Creates a random Guid
    pub fn new() -> Guid {
        Guid {
            uuid: Uuid::new_v4(),
        }
    }

    /// Returns the bytes of the Guid
    pub fn as_bytes(&self) -> &[u8; 16] {
        self.uuid.as_bytes()
    }

    // Creates a guid from bytes
    pub fn from_bytes(bytes: [u8; 16]) -> Guid {
        Guid {
            uuid: Uuid::from_bytes(bytes),
        }
    }
}