serde_nanos/
de.rs

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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
use std::fmt;
use std::marker::PhantomData;

#[cfg(feature = "chrono")]
use chrono;

use serde::de::{Error, SeqAccess, Visitor};
use serde::Deserializer;

/// Types that can be deserialized via `#[serde(with = "serde_nanos")]`.
pub trait Deserialize<'de>: Sized {
    #[allow(missing_docs)]
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>;
}

impl<'de> Deserialize<'de> for std::time::Duration {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        serde::Deserialize::deserialize(deserializer)
            .map(|nanos| std::time::Duration::from_nanos(nanos))
    }
}

impl<'de> Deserialize<'de> for Option<std::time::Duration> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct OptionVisitor<T> {
            marker: PhantomData<T>,
        }

        impl<'de, T: Deserialize<'de>> Visitor<'de> for OptionVisitor<T> {
            type Value = Option<T>;

            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                formatter.write_str("option")
            }

            #[inline]
            fn visit_unit<E>(self) -> Result<Option<T>, E>
            where
                E: Error,
            {
                Ok(None)
            }

            #[inline]
            fn visit_none<E>(self) -> Result<Option<T>, E>
            where
                E: Error,
            {
                Ok(None)
            }

            #[inline]
            fn visit_some<D>(self, deserializer: D) -> Result<Option<T>, D::Error>
            where
                D: Deserializer<'de>,
            {
                T::deserialize(deserializer).map(Some)
            }
        }

        deserializer.deserialize_option(OptionVisitor {
            marker: PhantomData,
        })
    }
}

impl<'de> Deserialize<'de> for Vec<std::time::Duration> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct VecVisitor {
            marker: PhantomData<Vec<std::time::Duration>>,
        }
        impl<'de> Visitor<'de> for VecVisitor {
            type Value = Vec<std::time::Duration>;

            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                formatter.write_str("array of durations in nanoseconds")
            }

            fn visit_seq<S>(self, mut visitor: S) -> Result<Self::Value, S::Error>
            where
                S: SeqAccess<'de>,
            {
                let mut durations = Vec::with_capacity(visitor.size_hint().unwrap_or(0));
                while let Some(elem) = visitor.next_element()? {
                    durations.push(std::time::Duration::from_nanos(elem));
                }
                Ok(durations)
            }
        }
        deserializer.deserialize_seq(VecVisitor {
            marker: PhantomData,
        })
    }
}

#[cfg(feature = "chrono")]
impl<'de> Deserialize<'de> for chrono::Duration {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        serde::Deserialize::deserialize(deserializer)
            .map(|nanos| chrono::Duration::nanoseconds(nanos))
    }
}

#[cfg(feature = "chrono")]
impl<'de> Deserialize<'de> for Option<chrono::Duration> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct OptionVisitor<T> {
            marker: PhantomData<T>,
        }

        impl<'de, T: Deserialize<'de>> Visitor<'de> for OptionVisitor<T> {
            type Value = Option<T>;

            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                formatter.write_str("option")
            }

            #[inline]
            fn visit_unit<E>(self) -> Result<Option<T>, E>
            where
                E: Error,
            {
                Ok(None)
            }

            #[inline]
            fn visit_none<E>(self) -> Result<Option<T>, E>
            where
                E: Error,
            {
                Ok(None)
            }

            #[inline]
            fn visit_some<D>(self, deserializer: D) -> Result<Option<T>, D::Error>
            where
                D: Deserializer<'de>,
            {
                T::deserialize(deserializer).map(Some)
            }
        }

        deserializer.deserialize_option(OptionVisitor {
            marker: PhantomData,
        })
    }
}

#[cfg(feature = "chrono")]
impl<'de> Deserialize<'de> for Vec<chrono::Duration> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct VecVisitor {
            marker: PhantomData<Vec<Duration>>,
        }
        impl<'de> Visitor<'de> for VecVisitor {
            type Value = Vec<Duration>;

            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
                formatter.write_str("array of durations in nanoseconds")
            }

            fn visit_seq<S>(self, mut visitor: S) -> Result<Self::Value, S::Error>
            where
                S: SeqAccess<'de>,
            {
                let mut durations = Vec::with_capacity(visitor.size_hint().unwrap_or(0));
                while let Some(elem) = visitor.next_element()? {
                    durations.push(Duration::from_nanos(elem));
                }
                Ok(durations)
            }
        }
        deserializer.deserialize_seq(VecVisitor {
            marker: PhantomData,
        })
    }
}