44 lines
1.1 KiB
Rust
44 lines
1.1 KiB
Rust
use rand::prelude::*;
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use std::{
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convert::TryInto,
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time::{SystemTime, UNIX_EPOCH},
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};
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pub fn millis_since_unix_epoch() -> js_int::UInt {
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(SystemTime::now()
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.duration_since(UNIX_EPOCH)
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.unwrap()
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.as_millis() as u64)
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.try_into()
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.expect("time millis are <= MAX_SAFE_UINT")
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}
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pub fn increment(old: Option<&[u8]>) -> Option<Vec<u8>> {
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let number = match old {
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Some(bytes) => {
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let array: [u8; 8] = bytes.try_into().unwrap();
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let number = u64::from_be_bytes(array);
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number + 1
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}
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None => 0,
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};
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Some(number.to_be_bytes().to_vec())
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}
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pub fn u64_from_bytes(bytes: &[u8]) -> u64 {
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let array: [u8; 8] = bytes.try_into().expect("bytes are valid u64");
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u64::from_be_bytes(array)
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}
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pub fn string_from_bytes(bytes: &[u8]) -> String {
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String::from_utf8(bytes.to_vec()).expect("bytes are valid utf8")
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}
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pub fn random_string(length: usize) -> String {
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thread_rng()
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.sample_iter(&rand::distributions::Alphanumeric)
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.take(length)
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.collect()
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}
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