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use chrono::prelude::*;
use chrono::Duration;
use std::path::Path;
use std::fs;
#[derive(Debug)]
pub struct AnalyticsTimestampFile {
datetime: DateTime<Utc>
}
impl AnalyticsTimestampFile {
pub fn is_expired(timestamp_file_path: &Path, minutes: u32) -> bool {
let instance = match Self::load(×tamp_file_path) {
Ok(value) => value,
Err(error) => {
debug!("AnalyticsTimestampFile: error: {:?}", error);
return true;
}
};
instance.is_expired_minutes(minutes)
}
pub fn load(timestamp_file_path: &Path) -> anyhow::Result<Self> {
if !timestamp_file_path.is_file() {
return Err(anyhow::anyhow!("No timestamp file found at path {:?}", timestamp_file_path));
}
let contents: String = match fs::read_to_string(timestamp_file_path) {
Ok(value) => value,
Err(error) => {
return Err(anyhow::anyhow!("Cannot load timestamp file. path: {:?} error: {:?}", timestamp_file_path, error));
}
};
let datetime: DateTime<Utc> = Self::parse_utc_string(&contents)?;
let instance = Self {
datetime: datetime,
};
Ok(instance)
}
fn parse_utc_string(utc_string: &String) -> anyhow::Result<DateTime<Utc>> {
let datetime: DateTime<FixedOffset> = match DateTime::parse_from_rfc3339(utc_string) {
Ok(value) => value,
Err(error) => {
return Err(anyhow::anyhow!("Cannot parse timestamp file as UTC. path: {:?} error: {:?}", utc_string, error));
}
};
let datetime: DateTime<Utc> = datetime.with_timezone(&Utc);
Ok(datetime)
}
fn is_expired_inner(&self, now_datetime: DateTime<Utc>, duration: Duration) -> bool {
(self.datetime + duration) <= now_datetime
}
pub fn is_expired_minutes(&self, minutes: u32) -> bool {
self.is_expired_inner(Utc::now(), Duration::minutes(minutes as i64))
}
fn format_date(datetime: &DateTime<Utc>) -> String {
datetime.to_rfc3339_opts(SecondsFormat::Secs, true).to_string()
}
fn save_datetime(timestamp_file_path: &Path, datetime: &DateTime<Utc>) -> anyhow::Result<()> {
let contents = Self::format_date(datetime);
fs::write(timestamp_file_path, contents)?;
Ok(())
}
pub fn save_now(timestamp_file_path: &Path) -> anyhow::Result<()> {
Self::save_datetime(timestamp_file_path, &Utc::now())
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::path::PathBuf;
#[test]
fn test_10000_parse_utc_string_ok() {
let date_str = "1999-03-24T21:59:33Z".to_string(); // release date of "the matrix"
let dt: DateTime<Utc> = AnalyticsTimestampFile::parse_utc_string(&date_str).unwrap();
assert_eq!(dt.year(), 1999);
assert_eq!(dt.month(), 3);
assert_eq!(dt.day(), 24);
assert_eq!(dt.hour(), 21);
assert_eq!(dt.minute(), 59);
}
#[test]
fn test_10001_parse_utc_string_error() {
static INPUT: &'static [&'static str] = &[
"",
"junk",
"1999-03-24T21:59:33", // Missing "Z" suffix
"1999-03-24 21:59:33Z", // Missing "T" infix
"1999-03-24T21:59:33Zjunk",
"junk1999-03-24T21:59:33Z",
];
for input in INPUT {
AnalyticsTimestampFile::parse_utc_string(&input.to_string()).expect_err("is supposed to fail");
}
}
#[test]
fn test_10002_format() {
let dt: DateTime<Utc> = Utc.with_ymd_and_hms(1999, 3, 24, 21, 59, 33).unwrap();
let s = AnalyticsTimestampFile::format_date(&dt);
assert_eq!(s, "1999-03-24T21:59:33Z"); // release date of "the matrix"
}
#[test]
fn test_20000_save_datetime_create_new_file() -> anyhow::Result<()> {
// Arrange
let tempdir = tempfile::tempdir().unwrap();
let basedir = PathBuf::from(&tempdir.path()).join("test_20000_save_datetime_create_new_file");
fs::create_dir(&basedir)?;
let path: PathBuf = basedir.join("timestamp.asm");
let dt: DateTime<Utc> = Utc.with_ymd_and_hms(1999, 3, 24, 21, 59, 33).unwrap();
// Act
AnalyticsTimestampFile::save_datetime(&path, &dt)?;
// Assert
let contents: String = fs::read_to_string(&path).unwrap();
assert_eq!(contents, "1999-03-24T21:59:33Z"); // release date of "the matrix"
Ok(())
}
#[test]
fn test_20001_save_datetime_overwrite_existing_file() -> anyhow::Result<()> {
// Arrange
let tempdir = tempfile::tempdir().unwrap();
let basedir = PathBuf::from(&tempdir.path()).join("test_20001_save_datetime_overwrite_existing_file");
fs::create_dir(&basedir)?;
let path: PathBuf = basedir.join("timestamp.asm");
let dt: DateTime<Utc> = Utc.with_ymd_and_hms(1999, 3, 24, 21, 59, 33).unwrap();
fs::write(&path, "overwrite me")?;
// Act
AnalyticsTimestampFile::save_datetime(&path, &dt)?;
// Assert
let contents: String = fs::read_to_string(&path).unwrap();
assert_eq!(contents, "1999-03-24T21:59:33Z"); // release date of "the matrix"
Ok(())
}
#[test]
fn test_30000_is_expired_inner() {
let date_str = "1999-03-24T00:00:00Z".to_string();
let dt: DateTime<Utc> = AnalyticsTimestampFile::parse_utc_string(&date_str).unwrap();
let timestamp = AnalyticsTimestampFile { datetime: dt };
let now: DateTime<Utc> = Utc.with_ymd_and_hms(1999, 3, 24, 0, 1, 0).unwrap();
assert_eq!(timestamp.is_expired_inner(now, Duration::minutes(30)), false);
assert_eq!(timestamp.is_expired_inner(now, Duration::minutes(2)), false);
assert_eq!(timestamp.is_expired_inner(now, Duration::minutes(1)), true);
assert_eq!(timestamp.is_expired_inner(now, Duration::minutes(0)), true);
assert_eq!(timestamp.is_expired_inner(now, Duration::seconds(120)), false);
assert_eq!(timestamp.is_expired_inner(now, Duration::seconds(61)), false);
assert_eq!(timestamp.is_expired_inner(now, Duration::seconds(60)), true);
assert_eq!(timestamp.is_expired_inner(now, Duration::seconds(0)), true);
}
}
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