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use chrono::{Duration, NaiveDateTime, Utc};
pub struct TimestampBuilder {
pub ts_fmt: String,
start: i64,
end: i64,
step: i64,
interval: String,
pub limit: i64,
}
impl Default for TimestampBuilder {
fn default() -> Self {
Self {
ts_fmt: "%Y-%m-%d %H:%M".into(),
start: 0,
end: 0,
step: 900000,
interval: "15m".into(),
limit: 499,
}
}
}
impl TimestampBuilder {
pub fn new<S1, S2, S3>(
start: S1,
end: Option<S2>,
step: S3,
) -> Result<Self, Box<dyn std::error::Error>>
where
S1: AsRef<str>,
S2: AsRef<str>,
S3: AsRef<str>,
{
let mut builder = TimestampBuilder::default();
builder.start = NaiveDateTime::parse_from_str(start.as_ref(), builder.ts_fmt.as_ref())?
.timestamp_millis();
builder.end = match end {
Some(end) => NaiveDateTime::parse_from_str(end.as_ref(), builder.ts_fmt.as_ref())?
.timestamp_millis(),
None => Utc::now().naive_utc().timestamp_millis(),
};
if builder.start >= builder.end {
return Err("start is later than end".into());
}
builder.interval = step.as_ref().into();
builder.step = match step.as_ref() {
"15m" => Duration::minutes(15).num_milliseconds(),
_ => todo!(),
};
Ok(builder)
}
pub fn build(&self) -> Vec<i64> {
let mut list: Vec<i64> = (self.start..self.end)
.step_by((self.step * self.limit) as usize)
.collect();
list.push(self.end);
list
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[should_panic]
fn ts_same_start_end() {
TimestampBuilder::new("2023-02-22 00:00", Some("2023-02-22 00:00"), "15m").unwrap();
}
#[test]
fn ts_under_limit() -> Result<(), Box<dyn std::error::Error>> {
let ts =
TimestampBuilder::new("2023-02-22 00:00", Some("2023-02-27 04:44"), "15m")?.build();
assert_eq!(ts.len(), 2);
let ts: Vec<_> = ts.windows(2).collect();
assert_eq!(ts.len(), 1);
Ok(())
}
#[test]
fn ts_as_same_as_limit() -> Result<(), Box<dyn std::error::Error>> {
let ts =
TimestampBuilder::new("2023-02-22 00:00", Some("2023-02-27 04:45"), "15m")?.build();
assert_eq!(ts.len(), 2);
let ts: Vec<_> = ts.windows(2).collect();
assert_eq!(ts.len(), 1);
Ok(())
}
#[test]
fn ts_exceed_limit() -> Result<(), Box<dyn std::error::Error>> {
let ts =
TimestampBuilder::new("2023-02-22 00:00", Some("2023-02-27 04:46"), "15m")?.build();
assert_eq!(ts.len(), 3);
let ts: Vec<_> = ts.windows(2).collect();
assert_eq!(ts.len(), 2);
Ok(())
}
#[test]
#[should_panic]
#[allow(unused)]
fn ts_panic_parse_str() {
TimestampBuilder::new("2023-02-22 00:00:00", None::<String>, "15m").unwrap();
}
#[test]
#[should_panic]
#[allow(unused)]
fn ts_panic_parse_step() {
TimestampBuilder::new("2023-02-22 00:00", None::<String>, "1d");
}
#[test]
fn ts_too_long_span() -> Result<(), Box<dyn std::error::Error>> {
let ts =
TimestampBuilder::new("2020-01-01 00:00", Some("2023-03-01 00:00"), "15m")?.build();
assert_eq!(ts.len(), 224);
let ts: Vec<_> = ts.windows(2).collect();
assert_eq!(ts.len(), 223);
Ok(())
}
#[test]
#[should_panic]
fn ts_start_later_than_end() {
TimestampBuilder::new("2023-03-01 01:00", Some("2023-03-01 00:00"), "15m").unwrap();
}
}