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use std::{
fmt,
ops::{Deref, DerefMut},
};
use viz_utils::{anyhow::anyhow, futures::future::BoxFuture, tracing};
use crate::{http, Context, Error, Extract, Result};
pub trait StateFactory: Send + Sync + 'static {
fn create(&self, extensions: &mut http::Extensions) -> bool;
}
#[derive(Clone)]
pub struct State<T>(T);
impl<T> State<T> {
pub fn new(t: T) -> Self {
Self(t)
}
pub fn into_inner(self) -> T {
self.0
}
}
impl<T> AsRef<T> for State<T> {
fn as_ref(&self) -> &T {
&self.0
}
}
impl<T> Deref for State<T> {
type Target = T;
fn deref(&self) -> &T {
&self.0
}
}
impl<T> DerefMut for State<T> {
fn deref_mut(&mut self) -> &mut T {
&mut self.0
}
}
impl<T: fmt::Debug> fmt::Debug for State<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
T::fmt(&self, f)
}
}
impl<T> StateFactory for State<T>
where
T: Clone + Send + Sync + 'static,
{
fn create(&self, extensions: &mut http::Extensions) -> bool {
if extensions.get::<Self>().is_none() {
extensions.insert(self.clone());
true
} else {
false
}
}
}
impl<T> Extract for State<T>
where
T: Clone + Send + Sync + 'static,
{
type Error = Error;
#[inline]
fn extract<'a>(cx: &'a mut Context) -> BoxFuture<'a, Result<Self, Self::Error>> {
let state = cx.extensions().get::<Self>().cloned().ok_or_else(|| {
tracing::debug!("State extract error: {}", std::any::type_name::<T>());
anyhow!("State is not configured")
});
Box::pin(async move { state })
}
}
impl Context {
pub fn state<T>(&self) -> Result<T, Error>
where
T: Clone + Send + Sync + 'static,
{
self.extensions()
.get::<State<T>>()
.cloned()
.ok_or_else(|| {
tracing::debug!("State extract error: {}", std::any::type_name::<T>());
anyhow!("State is not configured")
})
.map(State::into_inner)
}
}