pub struct DurationSeconds<FORMAT: Format = u64, STRICTNESS: Strictness = Strict>(_);
Expand description

De/Serialize Durations as number of seconds.

De/serialize durations as number of seconds with subsecond precision. Subsecond precision is only supported for DurationSecondsWithFrac, but not for DurationSeconds. You can configure the serialization format between integers, floats, and stringified numbers with the FORMAT specifier and configure the deserialization with the STRICTNESS specifier.

The STRICTNESS specifier can either be formats::Strict or formats::Flexible and defaults to formats::Strict. formats::Strict means that deserialization only supports the type given in FORMAT, e.g., if FORMAT is u64 deserialization from a f64 will error. formats::Flexible means that deserialization will perform a best effort to extract the correct duration and allows deserialization from any type. For example, deserializing DurationSeconds<f64, Flexible> will discard any subsecond precision during deserialization from f64 and will parse a String as an integer number.

This type also supports chrono::Duration with the chrono-feature flag.

Duration TypeConverterAvailable FORMATs
std::time::DurationDurationSecondsu64, f64, String
std::time::DurationDurationSecondsWithFracf64, String
chrono::DurationDurationSecondsi64, f64, String
chrono::DurationDurationSecondsWithFracf64, String

Examples

use std::time::Duration;

#[serde_as]
#[derive(Deserialize, Serialize)]
struct Durations {
    #[serde_as(as = "DurationSeconds<u64>")]
    d_u64: Duration,
    #[serde_as(as = "DurationSeconds<f64>")]
    d_f64: Duration,
    #[serde_as(as = "DurationSeconds<String>")]
    d_string: Duration,
};

// Serialization
// See how the values get rounded, since subsecond precision is not allowed.

let d = Durations {
    d_u64: Duration::new(12345, 0), // Create from seconds and nanoseconds
    d_f64: Duration::new(12345, 500_000_000),
    d_string: Duration::new(12345, 999_999_999),
};
// Observe the different datatypes
let expected = json!({
    "d_u64": 12345,
    "d_f64": 12346.0,
    "d_string": "12346",
});
assert_eq!(expected, serde_json::to_value(&d).unwrap());

// Deserialization works too
// Subsecond precision in numbers will be rounded away

let json = json!({
    "d_u64": 12345,
    "d_f64": 12345.5,
    "d_string": "12346",
});
let expected = Durations {
    d_u64: Duration::new(12345, 0), // Create from seconds and nanoseconds
    d_f64: Duration::new(12346, 0),
    d_string: Duration::new(12346, 0),
};
assert_eq!(expected, serde_json::from_value(json).unwrap());

chrono::Duration is also supported when using the chrono feature. It is a signed duration, thus can be de/serialized as an i64 instead of a u64.

use chrono::Duration;

#[serde_as]
#[derive(Deserialize, Serialize)]
struct Durations {
    #[serde_as(as = "DurationSeconds<i64>")]
    d_i64: Duration,
    #[serde_as(as = "DurationSeconds<f64>")]
    d_f64: Duration,
    #[serde_as(as = "DurationSeconds<String>")]
    d_string: Duration,
};

// Serialization
// See how the values get rounded, since subsecond precision is not allowed.

let d = Durations {
    d_i64: Duration::seconds(-12345),
    d_f64: Duration::seconds(-12345) + Duration::milliseconds(500),
    d_string: Duration::seconds(12345) + Duration::nanoseconds(999_999_999),
};
// Observe the different datatypes
let expected = json!({
    "d_i64": -12345,
    "d_f64": -12345.0,
    "d_string": "12346",
});
assert_eq!(expected, serde_json::to_value(&d).unwrap());

// Deserialization works too
// Subsecond precision in numbers will be rounded away

let json = json!({
    "d_i64": -12345,
    "d_f64": -12345.5,
    "d_string": "12346",
});
let expected = Durations {
    d_i64: Duration::seconds(-12345),
    d_f64: Duration::seconds(-12346),
    d_string: Duration::seconds(12346),
};
assert_eq!(expected, serde_json::from_value(json).unwrap());

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Returns the “default value” for a type. Read more

Deserialize this value from the given Serde deserializer.

Deserialize this value from the given Serde deserializer.

Deserialize this value from the given Serde deserializer.

Deserialize this value from the given Serde deserializer.

Serialize this value into the given Serde serializer.

Serialize this value into the given Serde serializer.

Serialize this value into the given Serde serializer.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.