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use std::marker::PhantomData;
use rs_jsonrpc_core as core;
use rs_jsonrpc_pubsub as pubsub;
use serde;
use util::to_value;
use self::core::futures::{self, Sink as FuturesSink};
pub use self::pubsub::SubscriptionId;
#[derive(Debug)]
pub struct Subscriber<T, E = core::Error> {
subscriber: pubsub::Subscriber,
_data: PhantomData<(T, E)>,
}
impl<T, E> Subscriber<T, E> {
pub fn new(subscriber: pubsub::Subscriber) -> Self {
Subscriber {
subscriber: subscriber,
_data: PhantomData,
}
}
pub fn reject(self, error: core::Error) -> Result<(), ()> {
self.subscriber.reject(error)
}
pub fn assign_id(self, id: SubscriptionId) -> Result<Sink<T, E>, ()> {
let sink = self.subscriber.assign_id(id.clone())?;
Ok(Sink {
id: id,
sink: sink,
buffered: None,
_data: PhantomData,
})
}
}
#[derive(Debug, Clone)]
pub struct Sink<T, E = core::Error> {
sink: pubsub::Sink,
id: SubscriptionId,
buffered: Option<core::Params>,
_data: PhantomData<(T, E)>,
}
impl<T: serde::Serialize, E: serde::Serialize> Sink<T, E> {
pub fn notify(&self, val: Result<T, E>) -> pubsub::SinkResult {
self.sink.notify(self.val_to_params(val))
}
fn val_to_params(&self, val: Result<T, E>) -> core::Params {
let id = self.id.clone().into();
let val = val.map(to_value).map_err(to_value);
core::Params::Map(vec![
("subscription".to_owned(), id),
match val {
Ok(val) => ("result".to_owned(), val),
Err(err) => ("error".to_owned(), err),
},
].into_iter().collect())
}
fn poll(&mut self) -> futures::Poll<(), pubsub::TransportError> {
if let Some(item) = self.buffered.take() {
let result = self.sink.start_send(item)?;
if let futures::AsyncSink::NotReady(item) = result {
self.buffered = Some(item);
}
}
if self.buffered.is_some() {
Ok(futures::Async::NotReady)
} else {
Ok(futures::Async::Ready(()))
}
}
}
impl<T: serde::Serialize, E: serde::Serialize> futures::sink::Sink for Sink<T, E> {
type SinkItem = Result<T, E>;
type SinkError = pubsub::TransportError;
fn start_send(&mut self, item: Self::SinkItem) -> futures::StartSend<Self::SinkItem, Self::SinkError> {
if self.poll()?.is_not_ready() {
return Ok(futures::AsyncSink::NotReady(item));
}
let val = self.val_to_params(item);
self.buffered = Some(val);
self.poll()?;
Ok(futures::AsyncSink::Ready)
}
fn poll_complete(&mut self) -> futures::Poll<(), Self::SinkError> {
self.poll()?;
self.sink.poll_complete()
}
fn close(&mut self) -> futures::Poll<(), Self::SinkError> {
self.poll()?;
self.sink.close()
}
}