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|
use base16ct::lower;
use rocket::request::FromParam;
use serde::{de::{IntoDeserializer, Visitor}, Deserialize, Deserializer, Serialize};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct UID(u8, u8);
pub const EMPTY_UID: UID = UID(0,0);
struct UIDVisitor;
impl<'de> Visitor<'de> for UIDVisitor {
type Value = UID;
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
formatter.write_str("A Hex String containing 2 bytes")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: serde::de::Error, {
if v.is_ascii() {
if v.len() == 4 {
match hex::decode(v) {
Ok(n) => Ok(UID(n[0], n[1])),
Err(_) => panic!()
}
} else {
panic!()
}
} else {
panic!()
}
}
}
impl<'de> Deserialize<'de> for UID {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de> {
deserializer.deserialize_str(UIDVisitor)
}
}
impl From<&str> for UID {
fn from(value: &str) -> Self {
if value.is_ascii() {
if value.len() == 4 {
match hex::decode(value) {
Ok(n) => UID(n[0], n[1]),
Err(_) => panic!("Could not decode hex")
}
} else {
panic!();
}
} else {
panic!();
}
}
}
impl Serialize for UID {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer {
serializer.serialize_str(&lower::encode_string(&[self.0, self.1]))
}
}
impl<'a> FromParam<'a> for UID {
type Error = &'a str;
fn from_param(param: &'a str) -> Result<Self, Self::Error> {
let x: Result<UID, serde_json::Error> = param.into_deserializer().deserialize_str(UIDVisitor);
match x {
Ok(n) => Ok(n),
Err(_) => Err("Could not convert param using deserializer"),
}
}
}
#[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 delete_uid(&mut self, u: UID) {
self.used_uids = self.used_uids.clone().into_iter().filter(|old| old != &u).collect();
}
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())
}
}
|
