Struct prost_types::Duration
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pub struct Duration { pub seconds: i64, pub nanos: i32, }
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 (durations.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
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.
Trait Implementations
impl Message for Duration
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fn encode_raw<B>(&self, buf: &mut B) where
B: BufMut,
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B: BufMut,
fn merge_field<B>(&mut self, buf: &mut B) -> Result<(), DecodeError> where
B: Buf,
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B: Buf,
fn encoded_len(&self) -> usize
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Returns the encoded length of the message without a length delimiter.
fn clear(&mut self)
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Clears the message, resetting all fields to their default.
fn encode<B>(&self, buf: &mut B) -> Result<(), EncodeError> where
B: BufMut,
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B: BufMut,
Encodes the message to a buffer. Read more
fn encode_length_delimited<B>(&self, buf: &mut B) -> Result<(), EncodeError> where
B: BufMut,
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B: BufMut,
Encodes the message with a length-delimiter to a buffer. Read more
fn decode<B>(buf: B) -> Result<Self, DecodeError> where
B: IntoBuf,
Self: Default,
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B: IntoBuf,
Self: Default,
Decodes an instance of the message from a buffer. Read more
fn decode_length_delimited<B>(buf: B) -> Result<Self, DecodeError> where
B: IntoBuf,
Self: Default,
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B: IntoBuf,
Self: Default,
Decodes a length-delimited instance of the message from the buffer.
fn merge<B>(&mut self, buf: B) -> Result<(), DecodeError> where
B: IntoBuf,
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B: IntoBuf,
Decodes an instance of the message from a buffer, and merges it into self
. Read more
fn merge_length_delimited<B>(&mut self, buf: B) -> Result<(), DecodeError> where
B: IntoBuf,
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B: IntoBuf,
Decodes a length-delimited instance of the message from buffer, and merges it into self
. Read more
impl Default for Duration
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impl Clone for Duration
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fn clone(&self) -> Duration
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Debug for Duration
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impl PartialEq for Duration
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fn eq(&self, __arg_0: &Duration) -> bool
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This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Duration) -> bool
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This method tests for !=
.
impl From<Duration> for Duration
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Converts a std::time::Duration
to a Duration
.