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use crate::error::Result;
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use crate::error_event::{ErrorEventData, ERROR_EVENT_NAME};
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use crate::events::event::Event;
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use crate::events::payload::EventSendPayload;
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use crate::ipc::context::Context;
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use crate::protocol::AsyncProtocolStream;
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use std::sync::Arc;
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use tokio::io::AsyncWriteExt;
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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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pub struct StreamEmitter<S: AsyncProtocolStream> {
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stream: Arc<Mutex<S::OwnedSplitWriteHalf>>,
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}
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impl<S> Clone for StreamEmitter<S>
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where
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S: AsyncProtocolStream,
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{
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fn clone(&self) -> Self {
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Self {
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stream: Arc::clone(&self.stream),
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}
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}
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}
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impl<P> StreamEmitter<P>
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where
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P: AsyncProtocolStream,
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{
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pub fn new(stream: P::OwnedSplitWriteHalf) -> 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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#[tracing::instrument(level = "trace", skip(self, data))]
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pub async fn _emit<T: EventSendPayload>(
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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 = data.to_payload_bytes()?;
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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_id = event.id();
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let event_bytes = event.into_bytes()?;
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{
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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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tracing::trace!(bytes_len = event_bytes.len());
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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: EventSendPayload>(
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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: EventSendPayload>(
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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: EventSendPayload>(
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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: EventSendPayload>(
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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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#[tracing::instrument(skip(self, ctx), fields(self.message_id))]
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pub async fn await_reply<P: AsyncProtocolStream>(&self, ctx: &Context<P>) -> Result<Event> {
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let reply = ctx.await_reply(self.message_id).await?;
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if reply.name() == ERROR_EVENT_NAME {
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Err(reply.data::<ErrorEventData>()?.into())
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} else {
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Ok(reply)
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}
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}
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}
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