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/// Unique identifier for DNS queries and connection attempts.
///
/// Used to correlate requests (Output events) with their responses (Input events).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Id(u64);
impl From<u64> for Id {
fn from(value: u64) -> Self {
Id(value)
}
}
impl From<Id> for u64 {
fn from(id: Id) -> u64 {
id.0
}
}
/// Generator for unique IDs.
///
/// Uses a simple incrementing counter. Internal to the crate.
pub(crate) struct IdGenerator {
next: u64,
}
impl IdGenerator {
/// Creates a new ID generator starting from 0.
pub(crate) fn new() -> Self {
Self { next: 0 }
}
/// Generates the next unique ID.
///
/// Uses wrapping arithmetic to handle overflow (though u64 overflow is extremely unlikely).
pub(crate) fn next_id(&mut self) -> Id {
let id = self.next;
self.next = self.next.wrapping_add(1);
Id(id)
}
}