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92 lines
2.3 KiB
Rust
92 lines
2.3 KiB
Rust
use crate::error::Result;
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use crate::events::event::Event;
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use crate::ipc::context::Context;
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use crate::payload::{BytePayload, IntoPayload};
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use bytes::Bytes;
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use std::collections::HashMap;
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use std::fmt::{Debug, Formatter};
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use std::future::Future;
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use std::pin::Pin;
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use std::sync::Arc;
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pub struct Response(Bytes);
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impl Response {
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/// Creates a new response with a given payload
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pub fn payload<P: IntoPayload>(ctx: &Context, payload: P) -> Result<Self> {
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let bytes = payload.into_payload(ctx)?;
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Ok(Self(bytes))
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}
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/// Creates an empty response
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pub fn empty() -> Self {
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Self(Bytes::new())
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}
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pub(crate) fn into_byte_payload(self) -> BytePayload {
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BytePayload::from(self.0)
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}
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}
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type EventCallback = Arc<
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dyn for<'a> Fn(
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&'a Context,
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Event,
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) -> Pin<Box<(dyn Future<Output = Result<Response>> + Send + 'a)>>
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+ Send
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+ Sync,
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>;
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/// Handler for events
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#[derive(Clone)]
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pub struct EventHandler {
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callbacks: HashMap<String, EventCallback>,
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}
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impl Debug for EventHandler {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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let callback_names: String = self
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.callbacks
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.keys()
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.cloned()
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.collect::<Vec<String>>()
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.join(", ");
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format!("EventHandler {{callbacks: [{}]}}", callback_names).fmt(f)
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}
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}
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impl EventHandler {
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/// Creates a new event handler
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pub fn new() -> Self {
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Self {
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callbacks: HashMap::new(),
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}
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}
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/// Adds a new event callback
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#[tracing::instrument(skip(self, callback))]
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pub fn on<F: 'static>(&mut self, name: &str, callback: F)
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where
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F: for<'a> Fn(
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&'a Context,
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Event,
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) -> Pin<Box<(dyn Future<Output = Result<Response>> + Send + 'a)>>
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+ Send
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+ Sync,
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{
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self.callbacks.insert(name.to_string(), Arc::new(callback));
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}
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/// Handles a received event
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#[inline]
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#[tracing::instrument(level = "debug", skip(self, ctx, event))]
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pub async fn handle_event(&self, ctx: &Context, event: Event) -> Result<Response> {
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if let Some(cb) = self.callbacks.get(event.name()) {
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cb.as_ref()(ctx, event).await
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} else {
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Ok(Response::empty())
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}
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}
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}
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