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#[macro_use]
extern crate arrayref;
extern crate strum;
extern crate strum_macros;
pub mod rksuid {
use base_encode::{from_str, to_string};
extern crate time;
use chrono::prelude::*;
use time::Duration;
use rand::prelude::*;
use rand::distributions::Standard;
use rand_pcg::Pcg64Mcg;
use strum_macros::{Display, EnumIter};
pub const ALPHABET: &[u8; 62] =
b"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
#[derive(Debug, PartialOrd, Ord, Clone, Copy, PartialEq, Eq)]
pub struct Ksuid {
pub timestamp: u32,
pub payload: u128,
}
#[derive(Debug, PartialOrd, Ord, Clone, Copy, PartialEq, Eq, Display, EnumIter)]
pub enum RngType{
PCG64FAST,
}
pub fn new(timestamp: Option<u32>, payload: Option<u128>) -> Ksuid {
let internal_timestamp = match timestamp {
None => gen_timestamp(),
Some(i) => i,
};
let internal_payload = match payload {
None => gen_payload(None),
Some(i) => i,
};
Ksuid {
timestamp: internal_timestamp,
payload: internal_payload,
}
}
impl Ksuid {
pub fn serialize(&self) -> String {
let mut merged_string: String;
let all_bytes = self.get_bytes();
merged_string = to_string(array_ref![all_bytes, 0, 20], 62, ALPHABET).unwrap();
if merged_string.char_indices().count() < 27 {
let num_zeros = 27 - merged_string.char_indices().count();
let zero_str = String::from("0").repeat(num_zeros);
merged_string = zero_str + merged_string.as_str();
}
merged_string
}
pub fn get_time(&self) -> DateTime<Utc> {
to_std_epoch(self.timestamp)
}
pub fn get_payload(&self) -> String {
let payload_bytes = self.payload.to_be_bytes().to_vec();
to_string(array_ref![payload_bytes, 0, 16], 16, b"0123456789ABCDEF").unwrap()
}
fn get_bytes(&self) -> Vec<u8> {
self
.timestamp
.to_be_bytes()
.to_vec()
.into_iter()
.chain(self.payload.to_be_bytes().to_vec().into_iter())
.collect()
}
pub fn get_formatted_lines(&self) -> [String; 7] {
let all_bytes = self.get_bytes();
let all_bytes_str =
to_string(array_ref![all_bytes, 0, 16], 16, b"0123456789ABCDEF").unwrap();
let output: [String; 7] = [
"REPRESENTATION:".to_string(),
format!("\tString: {}", self.serialize()),
format!("\tRaw: {}", all_bytes_str),
"COMPONENTS:".to_string(),
format!("\tTime: {}", self.get_time().to_rfc2822()),
format!("\tTimestamp: {}", self.timestamp),
format!("\tPayload: {}", self.get_payload()),
];
output
}
pub fn get_formatted(&self) -> String {
let mut formatted: String = String::new();
for line in self.get_formatted_lines().iter() {
formatted.push_str(&line);
formatted.push_str("\n");
}
formatted
}
}
pub fn deserialize(text: &str) -> Ksuid {
let unpadded = text.trim_start_matches('0');
let bytes_from_str_be_parsed = from_str(unpadded, 62, ALPHABET);
if let Some(bytes_from_str_be) = bytes_from_str_be_parsed {
let timestamp_bytes: &[u8; 4] = array_ref![bytes_from_str_be, 0, 4];
let payload_bytes: &[u8; 16] = array_ref![bytes_from_str_be, 4, 16];
let timestamp: u32 = u32::from_be_bytes(*timestamp_bytes);
let payload: u128 = u128::from_be_bytes(*payload_bytes);
new(Some(timestamp), Some(payload))
} else {
panic!();
}
}
fn gen_timestamp() -> u32 {
Utc::now().signed_duration_since(gen_epoch()).num_seconds() as u32
}
pub fn gen_payload(rng: Option<RngType>) -> u128 {
match rng {
Some(_) => gen_payload_pcg64_fast(),
None => gen_payload_pcg64_fast(),
}
}
fn gen_payload_pcg64_fast() -> u128 {
let payload: u128 = Pcg64Mcg::from_entropy().sample(Standard);
payload
}
pub fn gen_epoch() -> DateTime<Utc> {
Utc.timestamp(1_400_000_000, 0)
}
pub fn to_std_epoch(timestamp: u32) -> DateTime<Utc> {
let base_epoch = gen_epoch();
base_epoch + Duration::seconds(timestamp as i64)
}
}