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use std::collections::HashMap;
use json::JsonValue;
use std::future::Future;
use futures::future::BoxFuture;
pub trait Handler: Send + Sync + 'static {
fn handle(&self, _: JsonValue) -> BoxFuture<'static, ()>;
}
impl<C, F> Handler for C
where C: Send + Sync + 'static + Fn(JsonValue) -> F,
F: Future<Output = ()> + 'static + Send {
fn handle(&self, req: JsonValue) -> BoxFuture<'static, ()> {
Box::pin((*self)(req))
}
}
pub struct UpdateRouter {
router: HashMap<String, Box<dyn Handler>>,
rt: tokio::runtime::Handle,
}
impl UpdateRouter {
pub fn new(rt: tokio::runtime::Handle) -> Self {
Self {
router: HashMap::new(),
rt: rt
}
}
pub fn add_handler<H: Handler>(&mut self, update_type: &str, handler: H) {
self.router.insert(update_type.to_owned(), Box::new(handler));
}
pub fn dispatch(&self, update: JsonValue) {
let update_type: &str = update["@type"].as_str().unwrap();
self.router.get(update_type)
.and_then(|handler| { self.rt.spawn(handler.handle(update)); Some(()) })
.or_else(|| { println!("handler not found"); Some(()) });
}
}
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