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use crate::{Client, Event};
use async_trait::async_trait;
use nohash_hasher::NoHashHasher;
use std::{
any::{Any, TypeId},
collections::HashMap,
hash::BuildHasherDefault,
};
type U64Hasher = BuildHasherDefault<NoHashHasher<u64>>;
// kind of based on https://docs.rs/http/latest/src/http/extensions.rs.html
/// A map of plugin ids to Plugin trait objects. The client stores this so we
/// can keep the state for our plugins.
///
/// If you're using azalea, you should generate this from the `plugins!` macro.
#[derive(Clone, Default)]
pub struct Plugins {
map: Option<HashMap<TypeId, Box<dyn Plugin>, U64Hasher>>,
}
impl Plugins {
pub fn new() -> Self {
Self::default()
}
pub fn add<T: Plugin>(&mut self, plugin: T) {
if self.map.is_none() {
self.map = Some(HashMap::with_hasher(BuildHasherDefault::default()));
}
self.map
.as_mut()
.unwrap()
.insert(TypeId::of::<T>(), Box::new(plugin));
}
pub fn get<T: Plugin>(&self) -> Option<&T> {
self.map
.as_ref()
.and_then(|map| map.get(&TypeId::of::<T>()))
.and_then(|boxed| (boxed.as_ref() as &dyn Any).downcast_ref::<T>())
}
}
impl IntoIterator for Plugins {
type Item = Box<dyn Plugin>;
type IntoIter = std::vec::IntoIter<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
self.map
.map(|map| map.into_values().collect::<Vec<_>>())
.unwrap_or_default()
.into_iter()
}
}
/// Plugins can keep their own personal state, listen to events, and add new functions to Client.
#[async_trait]
pub trait Plugin: Send + Sync + PluginClone + Any + 'static {
async fn handle(self: Box<Self>, event: Event, bot: Client);
}
/// An internal trait that allows Plugin to be cloned.
#[doc(hidden)]
pub trait PluginClone {
fn clone_box(&self) -> Box<dyn Plugin>;
}
impl<T> PluginClone for T
where
T: 'static + Plugin + Clone,
{
fn clone_box(&self) -> Box<dyn Plugin> {
Box::new(self.clone())
}
}
impl Clone for Box<dyn Plugin> {
fn clone(&self) -> Self {
self.clone_box()
}
}
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