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121 lines
3.2 KiB
Rust
121 lines
3.2 KiB
Rust
use crate::context::Context;
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use crate::error::Result;
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use crate::events::event::Event;
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use serde::Serialize;
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use std::sync::Arc;
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use tokio::io::AsyncWriteExt;
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use tokio::net::tcp::OwnedWriteHalf;
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use tokio::sync::Mutex;
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/// An abstraction over the raw tokio tcp stream
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/// to emit events and share a connection across multiple
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/// contexts.
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#[derive(Clone)]
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pub struct StreamEmitter {
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stream: Arc<Mutex<OwnedWriteHalf>>,
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}
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impl StreamEmitter {
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pub fn new(stream: OwnedWriteHalf) -> Self {
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Self {
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stream: Arc::new(Mutex::new(stream)),
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}
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}
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pub async fn _emit<T: Serialize>(
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&self,
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namespace: Option<&str>,
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event: &str,
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data: T,
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res_id: Option<u64>,
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) -> Result<EmitMetadata> {
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let data_bytes = rmp_serde::to_vec(&data)?;
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log::debug!("Emitting event {:?}:{}", namespace, event);
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let event = if let Some(namespace) = namespace {
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Event::with_namespace(namespace.to_string(), event.to_string(), data_bytes, res_id)
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} else {
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Event::new(event.to_string(), data_bytes, res_id)
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};
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let event_bytes = event.to_bytes()?;
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{
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log::trace!("Writing {} bytes", event_bytes.len());
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let mut stream = self.stream.lock().await;
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(*stream).write_all(&event_bytes[..]).await?;
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}
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Ok(EmitMetadata::new(event.id()))
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}
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/// Emits an event
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pub async fn emit<S: AsRef<str>, T: Serialize>(
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&self,
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event: S,
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data: T,
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) -> Result<EmitMetadata> {
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self._emit(None, event.as_ref(), data, None).await
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}
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/// Emits an event to a specific namespace
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pub async fn emit_to<S1: AsRef<str>, S2: AsRef<str>, T: Serialize>(
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&self,
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namespace: S1,
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event: S2,
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data: T,
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) -> Result<EmitMetadata> {
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self._emit(Some(namespace.as_ref()), event.as_ref(), data, None)
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.await
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}
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/// Emits a response to an event
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pub async fn emit_response<S: AsRef<str>, T: Serialize>(
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&self,
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event_id: u64,
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event: S,
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data: T,
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) -> Result<EmitMetadata> {
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self._emit(None, event.as_ref(), data, Some(event_id)).await
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}
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/// Emits a response to an event to a namespace
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pub async fn emit_response_to<S1: AsRef<str>, S2: AsRef<str>, T: Serialize>(
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&self,
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event_id: u64,
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namespace: S1,
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event: S2,
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data: T,
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) -> Result<EmitMetadata> {
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self._emit(
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Some(namespace.as_ref()),
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event.as_ref(),
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data,
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Some(event_id),
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)
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.await
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}
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}
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/// A metadata object returned after emitting an event.
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/// This object can be used to wait for a response to an event.
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pub struct EmitMetadata {
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message_id: u64,
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}
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impl EmitMetadata {
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pub(crate) fn new(message_id: u64) -> Self {
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Self { message_id }
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}
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/// The ID of the emitted message
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pub fn message_id(&self) -> u64 {
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self.message_id
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}
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/// Waits for a reply to the given message.
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pub async fn await_reply(&self, ctx: &Context) -> Result<Event> {
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let reply = ctx.await_reply(self.message_id).await?;
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Ok(reply)
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}
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}
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