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103 lines
3.4 KiB
Rust
103 lines
3.4 KiB
Rust
use crate::context::Context;
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use crate::error::Error;
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use crate::event::EventType;
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use crate::ipc::stream_emitter::emit_metadata_with_response::EmitMetadataWithResponse;
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use crate::ipc::stream_emitter::emit_metadata_with_response_stream::EmitMetadataWithResponseStream;
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use crate::ipc::stream_emitter::event_metadata::EventMetadata;
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use crate::ipc::stream_emitter::SendStream;
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use crate::payload::IntoPayload;
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use crate::{error, poll_unwrap};
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use std::future::Future;
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use std::ops::DerefMut;
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use std::pin::Pin;
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use std::task::Poll;
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use tokio::io::AsyncWriteExt;
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/// A metadata object returned after emitting an event.
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/// To send the event this object needs to be awaited
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/// This object can be used to wait for a response to an event.
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/// The result contains the emitted event id.
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pub struct EmitMetadata<P: IntoPayload> {
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pub(crate) event_metadata: Option<EventMetadata<P>>,
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stream: Option<SendStream>,
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fut: Option<Pin<Box<dyn Future<Output = error::Result<u64>> + Send + Sync>>>,
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}
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impl<P: IntoPayload> EmitMetadata<P> {
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#[inline]
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pub(crate) fn new(
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ctx: Context,
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stream: SendStream,
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event_name: String,
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event_namespace: Option<String>,
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payload: P,
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res_id: Option<u64>,
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event_type: EventType,
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) -> Self {
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Self {
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event_metadata: Some(EventMetadata {
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event: None,
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ctx: Some(ctx),
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event_name: Some(event_name),
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event_namespace: Some(event_namespace),
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payload: Some(payload),
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res_id: Some(res_id),
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event_type: Some(event_type),
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}),
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stream: Some(stream),
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fut: None,
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}
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}
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/// Waits for a reply to the given message.
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#[tracing::instrument(skip(self), fields(self.message_id))]
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pub fn await_reply(self) -> EmitMetadataWithResponse<P> {
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EmitMetadataWithResponse {
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timeout: None,
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fut: None,
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emit_metadata: Some(self),
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}
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}
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pub fn stream_replies(self) -> EmitMetadataWithResponseStream<P> {
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EmitMetadataWithResponseStream {
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timeout: None,
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fut: None,
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emit_metadata: Some(self),
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}
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}
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}
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impl<P: IntoPayload> Unpin for EmitMetadata<P> {}
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impl<P: IntoPayload + Send + Sync + 'static> Future for EmitMetadata<P> {
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type Output = error::Result<u64>;
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fn poll(mut self: Pin<&mut Self>, cx: &mut std::task::Context<'_>) -> Poll<Self::Output> {
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if self.fut.is_none() {
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let event_metadata = poll_unwrap!(self.event_metadata.take());
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let stream = poll_unwrap!(self.stream.take());
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let event = match event_metadata.take_event() {
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Ok(m) => m,
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Err(e) => {
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return Poll::Ready(Err(e));
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}
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}
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.expect("poll after future was done");
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self.fut = Some(Box::pin(async move {
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let event_id = event.id();
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let event_bytes = event.into_bytes()?;
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let mut stream = stream.lock().await;
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stream.deref_mut().write_all(&event_bytes[..]).await?;
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stream.deref_mut().flush().await?;
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tracing::trace!(bytes_len = event_bytes.len());
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Ok(event_id)
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}));
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}
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self.fut.as_mut().unwrap().as_mut().poll(cx)
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}
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}
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