Struct DurationView 

pub struct DurationView<'a> {
    pub seconds: i64,
    pub nanos: i32,
    pub __buffa_unknown_fields: UnknownFieldsView<'a>,
}

A Duration represents a signed, fixed-length span of time represented as a count of seconds and fractions of seconds at nanosecond resolution. It is independent of any calendar and concepts like “day” or “month”. It is related to Timestamp in that the difference between two Timestamp values is a Duration and it can be added or subtracted from a Timestamp. Range is approximately +-10,000 years.

Examples

Example 1: Compute Duration from two Timestamps in pseudo code.

Timestamp start = ...;
Timestamp end = ...;
Duration duration = ...;

duration.seconds = end.seconds - start.seconds;
duration.nanos = end.nanos - start.nanos;

if (duration.seconds < 0 && duration.nanos > 0) {
  duration.seconds += 1;
  duration.nanos -= 1000000000;
} else if (duration.seconds > 0 && duration.nanos < 0) {
  duration.seconds -= 1;
  duration.nanos += 1000000000;
}

Example 2: Compute Timestamp from Timestamp + Duration in pseudo code.

Timestamp start = ...;
Duration duration = ...;
Timestamp end = ...;

end.seconds = start.seconds + duration.seconds;
end.nanos = start.nanos + duration.nanos;

if (end.nanos < 0) {
  end.seconds -= 1;
  end.nanos += 1000000000;
} else if (end.nanos >= 1000000000) {
  end.seconds += 1;
  end.nanos -= 1000000000;
}

Example 3: Compute Duration from datetime.timedelta in Python.

td = datetime.timedelta(days=3, minutes=10)
duration = Duration()
duration.FromTimedelta(td)

JSON Mapping

In JSON format, the Duration type is encoded as a string rather than an object, where the string ends in the suffix “s” (indicating seconds) and is preceded by the number of seconds, with nanoseconds expressed as fractional seconds. For example, 3 seconds with 0 nanoseconds should be encoded in JSON format as “3s”, while 3 seconds and 1 nanosecond should be expressed in JSON format as “3.000000001s”, and 3 seconds and 1 microsecond should be expressed in JSON format as “3.000001s”.

Fields

seconds: i64

Signed seconds of the span of time. Must be from -315,576,000,000 to +315,576,000,000 inclusive. Note: these bounds are computed from: 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years

Field 1: seconds

nanos: i32

Signed fractions of a second at nanosecond resolution of the span of time. Durations less than one second are represented with a 0 seconds field and a positive or negative nanos field. For durations of one second or more, a non-zero value for the nanos field must be of the same sign as the seconds field. Must be from -999,999,999 to +999,999,999 inclusive.

Field 2: nanos

__buffa_unknown_fields: UnknownFieldsView<'a>

Trait Implementations

impl<'a> Clone for DurationView<'a>

fn clone(&self) -> DurationView<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for DurationView<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> Default for DurationView<'a>

fn default() -> DurationView<'a>

Returns the “default value” for a type.

impl<'v> DefaultViewInstance for DurationView<'v>

fn default_view_instance<'a>() -> &'a Self

where Self: 'a,

Return a reference to the single default view instance.

impl<'a> MessageView<'a> for DurationView<'a>

type Owned = Duration

The corresponding owned message type.

fn decode_view(buf: &'a [u8]) -> Result<Self, DecodeError>

Decode a view from a buffer, borrowing string/bytes fields directly.

fn decode_view_with_limit( buf: &'a [u8], depth: u32, ) -> Result<Self, DecodeError>

Decode a view with a custom recursion depth limit.

fn to_owned_message(&self) -> Duration

Convert this view to the owned message type.

fn to_owned_from_source(&self, __buffa_src: Option<&Bytes>) -> Duration

Convert this view to the owned message type, optionally slicing bytes::Bytes-typed fields from source instead of copying.

impl<'a> ViewEncode<'a> for DurationView<'a>

fn compute_size(&self, _cache: &mut SizeCache) -> u32

Compute the encoded byte size of this view, recording nested sub-message sizes in cache for write_to to consume.

fn write_to(&self, _cache: &mut SizeCache, buf: &mut impl BufMut)

Write this view’s encoded bytes to a buffer, consuming nested-message sizes from cache (populated by a prior compute_size call on the same cache).

fn encode(&self, buf: &mut impl BufMut)

Compute size, then write. Primary view-encode entry point.

fn encode_with_cache(&self, cache: &mut SizeCache, buf: &mut impl BufMut)

Encode using a caller-supplied SizeCache, for reuse across many encodes in a hot loop. Clears the cache first.

fn encoded_len(&self) -> u32

Compute the encoded byte size of this view.

fn encode_length_delimited(&self, buf: &mut impl BufMut)

Encode this view as a length-delimited byte sequence.

fn encode_to_vec(&self) -> Vec<u8>

Encode this view to a new Vec<u8>.

fn encode_to_bytes(&self) -> Bytes

Encode this view to a new bytes::Bytes.

impl ViewReborrow for DurationView<'static>

type Reborrowed<'b> = DurationView<'b>

The same view type with its lifetime shortened to 'b.

fn reborrow<'b>(this: &'b Self) -> &'b Self::Reborrowed<'b>

Coerce &'b Self (= &'b FooView<'static>) to &'b Self::Reborrowed<'b> (= &'b FooView<'b>). The canonical body is just this; the compiler accepts it via standard lifetime variance for covariant view types.