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use crate::{RpcChannel, RpcError, RpcResult};
use futures::channel::mpsc;
use futures::{
task::{Context, Poll},
Future, Sink, SinkExt, Stream, StreamExt,
};
use jsonrpc_core::{BoxFuture, MetaIoHandler, Metadata, Middleware};
use jsonrpc_pubsub::Session;
use std::ops::Deref;
use std::pin::Pin;
use std::sync::Arc;
pub struct LocalRpc<THandler, TMetadata> {
handler: THandler,
meta: TMetadata,
buffered: Buffered,
queue: (mpsc::UnboundedSender<String>, mpsc::UnboundedReceiver<String>),
}
enum Buffered {
Request(BoxFuture<Option<String>>),
Response(String),
None,
}
impl<TMetadata, THandler, TMiddleware> LocalRpc<THandler, TMetadata>
where
TMetadata: Metadata,
TMiddleware: Middleware<TMetadata>,
THandler: Deref<Target = MetaIoHandler<TMetadata, TMiddleware>>,
{
pub fn new(handler: THandler) -> Self
where
TMetadata: Default,
{
Self::with_metadata(handler, Default::default())
}
pub fn with_metadata(handler: THandler, meta: TMetadata) -> Self {
Self {
handler,
meta,
buffered: Buffered::None,
queue: mpsc::unbounded(),
}
}
}
impl<TMetadata, THandler, TMiddleware> Stream for LocalRpc<THandler, TMetadata>
where
TMetadata: Metadata + Unpin,
TMiddleware: Middleware<TMetadata> + Unpin,
THandler: Deref<Target = MetaIoHandler<TMetadata, TMiddleware>> + Unpin,
{
type Item = String;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
self.queue.1.poll_next_unpin(cx)
}
}
impl<TMetadata, THandler, TMiddleware> LocalRpc<THandler, TMetadata>
where
TMetadata: Metadata + Unpin,
TMiddleware: Middleware<TMetadata> + Unpin,
THandler: Deref<Target = MetaIoHandler<TMetadata, TMiddleware>> + Unpin,
{
fn poll_buffered(&mut self, cx: &mut Context) -> Poll<Result<(), RpcError>> {
let response = match self.buffered {
Buffered::Request(ref mut r) => futures::ready!(r.as_mut().poll(cx)),
_ => None,
};
if let Some(response) = response {
self.buffered = Buffered::Response(response);
}
self.send_response().into()
}
fn send_response(&mut self) -> Result<(), RpcError> {
if let Buffered::Response(r) = std::mem::replace(&mut self.buffered, Buffered::None) {
self.queue.0.start_send(r).map_err(|e| RpcError::Other(Box::new(e)))?;
}
Ok(())
}
}
impl<TMetadata, THandler, TMiddleware> Sink<String> for LocalRpc<THandler, TMetadata>
where
TMetadata: Metadata + Unpin,
TMiddleware: Middleware<TMetadata> + Unpin,
THandler: Deref<Target = MetaIoHandler<TMetadata, TMiddleware>> + Unpin,
{
type Error = RpcError;
fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
futures::ready!(self.poll_buffered(cx))?;
futures::ready!(self.queue.0.poll_ready(cx))
.map_err(|e| RpcError::Other(Box::new(e)))
.into()
}
fn start_send(mut self: Pin<&mut Self>, item: String) -> Result<(), Self::Error> {
let future = self.handler.handle_request(&item, self.meta.clone());
self.buffered = Buffered::Request(Box::pin(future));
Ok(())
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
futures::ready!(self.poll_buffered(cx))?;
futures::ready!(self.queue.0.poll_flush_unpin(cx))
.map_err(|e| RpcError::Other(Box::new(e)))
.into()
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
futures::ready!(self.queue.0.poll_close_unpin(cx))
.map_err(|e| RpcError::Other(Box::new(e)))
.into()
}
}
pub fn connect_with_metadata_and_middleware<TClient, THandler, TMetadata, TMiddleware>(
handler: THandler,
meta: TMetadata,
) -> (TClient, impl Future<Output = RpcResult<()>>)
where
TClient: From<RpcChannel>,
TMiddleware: Middleware<TMetadata> + Unpin,
THandler: Deref<Target = MetaIoHandler<TMetadata, TMiddleware>> + Unpin,
TMetadata: Metadata + Unpin,
{
let (sink, stream) = LocalRpc::with_metadata(handler, meta).split();
let (rpc_client, sender) = crate::transports::duplex(Box::pin(sink), Box::pin(stream));
let client = TClient::from(sender);
(client, rpc_client)
}
pub fn connect_with_metadata<TClient, THandler, TMetadata>(
handler: THandler,
meta: TMetadata,
) -> (TClient, impl Future<Output = RpcResult<()>>)
where
TClient: From<RpcChannel>,
TMetadata: Metadata + Unpin,
THandler: Deref<Target = MetaIoHandler<TMetadata>> + Unpin,
{
connect_with_metadata_and_middleware(handler, meta)
}
pub fn connect_with_middleware<TClient, THandler, TMetadata, TMiddleware>(
handler: THandler,
) -> (TClient, impl Future<Output = RpcResult<()>>)
where
TClient: From<RpcChannel>,
TMetadata: Metadata + Default + Unpin,
TMiddleware: Middleware<TMetadata> + Unpin,
THandler: Deref<Target = MetaIoHandler<TMetadata, TMiddleware>> + Unpin,
{
connect_with_metadata_and_middleware(handler, Default::default())
}
pub fn connect<TClient, THandler, TMetadata>(handler: THandler) -> (TClient, impl Future<Output = RpcResult<()>>)
where
TClient: From<RpcChannel>,
TMetadata: Metadata + Default + Unpin,
THandler: Deref<Target = MetaIoHandler<TMetadata>> + Unpin,
{
connect_with_middleware(handler)
}
pub type LocalMeta = Arc<Session>;
pub fn connect_with_pubsub_and_middleware<TClient, THandler, TMiddleware>(
handler: THandler,
) -> (TClient, impl Future<Output = RpcResult<()>>)
where
TClient: From<RpcChannel>,
TMiddleware: Middleware<LocalMeta> + Unpin,
THandler: Deref<Target = MetaIoHandler<LocalMeta, TMiddleware>> + Unpin,
{
let (tx, rx) = mpsc::unbounded();
let meta = Arc::new(Session::new(tx));
let (sink, stream) = LocalRpc::with_metadata(handler, meta).split();
let stream = futures::stream::select(stream, rx);
let (rpc_client, sender) = crate::transports::duplex(Box::pin(sink), Box::pin(stream));
let client = TClient::from(sender);
(client, rpc_client)
}
pub fn connect_with_pubsub<TClient, THandler>(handler: THandler) -> (TClient, impl Future<Output = RpcResult<()>>)
where
TClient: From<RpcChannel>,
THandler: Deref<Target = MetaIoHandler<LocalMeta>> + Unpin,
{
connect_with_pubsub_and_middleware(handler)
}