dfir_lang/graph/ops/
source_stream_serde.rs

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1use quote::quote_spanned;
2
3use super::{
4    FloType, OperatorCategory, OperatorConstraints, OperatorWriteOutput, WriteContextArgs, RANGE_0,
5    RANGE_1,
6};
7
8/// > 0 input streams, 1 output stream
9///
10/// > Arguments: [`Stream`](https://docs.rs/futures/latest/futures/stream/trait.Stream.html)
11///
12/// Given a [`Stream`](https://docs.rs/futures/latest/futures/stream/trait.Stream.html)
13/// of `(serialized payload, addr)` pairs, deserializes the payload and emits each of the
14/// elements it receives downstream.
15///
16/// ```rustbook
17/// async fn serde_in() {
18///     let addr = dfir_rs::util::ipv4_resolve("localhost:9000".into()).unwrap();
19///     let (outbound, inbound, _) = dfir_rs::util::bind_udp_bytes(addr).await;
20///     let mut flow = dfir_rs::dfir_syntax! {
21///         source_stream_serde(inbound) -> map(Result::unwrap) -> map(|(x, a): (String, std::net::SocketAddr)| x.to_uppercase())
22///             -> for_each(|x| println!("{}", x));
23///     };
24///     flow.run_available();
25/// }
26/// ```
27pub const SOURCE_STREAM_SERDE: OperatorConstraints = OperatorConstraints {
28    name: "source_stream_serde",
29    categories: &[OperatorCategory::Source],
30    hard_range_inn: RANGE_0,
31    soft_range_inn: RANGE_0,
32    hard_range_out: RANGE_1,
33    soft_range_out: RANGE_1,
34    num_args: 1,
35    persistence_args: RANGE_0,
36    type_args: RANGE_0,
37    is_external_input: true,
38    has_singleton_output: false,
39    flo_type: Some(FloType::Source),
40    ports_inn: None,
41    ports_out: None,
42    input_delaytype_fn: |_| None,
43    write_fn: |wc @ &WriteContextArgs {
44                   root,
45                   context,
46                   op_span,
47                   ident,
48                   arguments,
49                   ..
50               },
51               _| {
52        let receiver = &arguments[0];
53        let stream_ident = wc.make_ident("stream");
54        let write_prologue = quote_spanned! {op_span=>
55            let mut #stream_ident = Box::pin(#receiver);
56        };
57        let write_iterator = quote_spanned! {op_span=>
58            let #ident = std::iter::from_fn(|| {
59                match #root::futures::stream::Stream::poll_next(#stream_ident.as_mut(), &mut std::task::Context::from_waker(&#context.waker())) {
60                    std::task::Poll::Ready(Some(std::result::Result::Ok((payload, addr)))) => Some(#root::util::deserialize_from_bytes(payload).map(|payload| (payload, addr))),
61                    std::task::Poll::Ready(Some(Err(_))) => None,
62                    std::task::Poll::Ready(None) => None,
63                    std::task::Poll::Pending => None,
64                }
65            });
66        };
67        Ok(OperatorWriteOutput {
68            write_prologue,
69            write_iterator,
70            ..Default::default()
71        })
72    },
73};
dfir_lang/graph/ops/source_stream_serde.rs

dfir_lang/graph/ops/
source_stream_serde.rs
