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#[macro_export]
macro_rules! stream_handler {
(
async fn $name:ident( $($ptt:tt)* ) $($tt:tt)*
) => (
$crate::stream_handler! {
async fn $name<Data>($($ptt)*) $($tt)*
}
);
(
async fn $name:ident<$data_ty:ty>(
$req:ident: $req_ty:ty,
$stream:ident
) $($tt:tt)*
) => (
$crate::stream_handler! {
async fn $name<$data_ty>($req: $req_ty, $stream, ) $($tt)*
}
);
(
async fn $name:ident<$data_ty:ty>(
$req:ident: $req_ty:ty,
$stream:ident,
$($data:ident),*
) -> $ret_ty:ty $block:block
) => (
#[allow(non_camel_case_types)]
pub struct $name;
impl $crate::stream::server::StreamHandler<$data_ty> for $name {
fn action(&self) -> &'static str {
use $crate::stream::Stream;
<$req_ty as Stream>::ACTION
}
fn kind(&self) -> $crate::stream::StreamKind {
use $crate::stream::Stream;
<$req_ty as Stream>::KIND
}
fn handle<'a>(
&'a self,
req: $crate::stream::message::MessageData,
streamer: $crate::stream::streamer::RawStreamer,
data: &'a $data_ty
) ->
$crate::stream::server::PinnedFuture<'a,
std::result::Result<
$crate::stream::message::MessageData,
$crate::stream::error::UnrecoverableError
>
>
{
use $crate::stream::Stream as __Stream;
use $crate::stream::Streamer as __Streamer;
use $crate::stream::message::MessageData as __MessageData;
type __Message = <$req_ty as __Stream>::Message;
type __Error = <$req_ty as __Stream>::Error;
async fn __handle(
$req: $req_ty,
#[allow(unused_mut)]
mut $stream: __Streamer<__Message>,
#[allow(unused_variables)]
raw_data: &$data_ty
) -> std::result::Result<(), __Error> {
$(
let $data = raw_data.$data();
)*
$block
}
$crate::stream::server::PinnedFuture::new(async move {
let req: $req_ty = req.deserialize()
.map_err(|e| format!(
"stream: failed to deserialize request {}",
e
))?;
#[allow(unused_mut)]
let mut streamer = streamer.assign_message::<__Message>();
let r = __handle(req, streamer, data).await;
let msg_data = match r {
Ok(_) => __MessageData::null(),
Err(e) => {
__MessageData::serialize(e)
.map_err(|e| e.to_string())?
}
};
Ok(msg_data)
})
}
}
)
}
#[cfg(test)]
mod tests {
use crate::stream::{Stream, StreamKind};
use crate::stream_handler;
use crate::error::{self, ApiError, StatusCode};
use std::fmt;
use serde::{Serialize, Deserialize};
struct Data;
#[derive(Debug, Serialize, Deserialize)]
struct SenderRequest {
hi: u64
}
#[derive(Debug, Serialize, Deserialize)]
struct SenderMessage {
num: u64
}
impl Stream for SenderRequest {
type Message = SenderMessage;
type Error = Error;
const KIND: StreamKind = StreamKind::Sender;
const ACTION: &'static str = "Hi";
}
#[derive(Debug, Serialize)]
enum Error {
FailedToSend
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Debug::fmt(self, f)
}
}
impl ApiError for Error {
fn internal<E: error::Error>(_error: E) -> Self { todo!() }
fn request<E: error::Error>(_error: E) -> Self { todo!() }
fn status_code(&self) -> StatusCode { todo!() }
}
stream_handler! {
async fn hi_stream(req: SenderRequest, stream) -> Result<(), Error> {
stream.send(SenderMessage { num: req.hi }).await
.map_err(|_| Error::FailedToSend)?;
Ok(())
}
}
}
