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use serde::{Deserialize, Serialize};
#[derive(Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq)]
pub struct UID(u8, u8);
impl UID {
fn to_hex(&self) -> String {
hex::encode_upper(vec![self.0, self.1])
}
pub fn from(s: String) -> Result<Self, String> {
if s.is_ascii() {
if s.len() == 4 {
match hex::decode(s) {
Ok(n) => Ok(UID(n[0], n[1])),
Err(_) => Err("Could not decode hex".into())
}
} else {
Err("UID length is incorrect".into())
}
} else {
Err("UID String is not valid".into())
}
}
}
#[derive(Serialize, Deserialize)]
pub struct Generator {
used_uids: Vec<UID>
}
impl Generator {
pub fn new() -> Generator {
Generator { used_uids: vec![] }
}
pub fn is_taken(&self, uid: UID) -> bool {
for u in self.used_uids.clone() {
if u == uid {
return true;
}
}
false
}
pub fn add_uid(&mut self, u: UID) -> Result<UID, String> {
if self.used_uids.contains(&u) {
Err("UID Taken".into())
} else {
self.used_uids.push(u);
Ok(u)
}
}
pub fn new_uid(&mut self) -> Result<UID, String> {
let mut count = 0;
loop {
let first = rand::random::<u8>();
let second = rand::random::<u8>();
let new = UID(first, second);
if self.used_uids.contains(&new) {
count += 1
} else {
self.used_uids.push(new);
return Ok(new);
}
if count > 1000 {
break
}
}
// Random generation didn't work. Try counting up throught all UID possibilities
loop {
for x in 0..=u8::MAX {
for y in 0..=u8::MAX {
let new = UID(x, y);
if !(self.used_uids.contains(&new)) {
self.used_uids.push(new);
return Ok(new);
}
}
}
break
}
Err("No available UID left".into())
}
}
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