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use crate::{Connection, Event, EventData, EventType, Fallible, HttpClient, RawEvent};
use futures_core::ready;
use futures_core::stream::Stream;
use serde_json::{from_str, Error};
use std::cell::UnsafeCell;
use std::convert::TryFrom;
use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};
impl TryFrom<RawEvent> for Event {
type Error = Error;
fn try_from(raw_event: RawEvent) -> Result<Self, Self::Error> {
use EventData::*;
let RawEvent {
id,
global_id,
event_type,
time,
data,
} = raw_event;
let data = data.get();
Ok(Event {
id,
global_id,
time,
data: match event_type {
EventType::ConfigSaved => ConfigSaved(from_str(data)?),
EventType::DeviceConnected => DeviceConnected(from_str(data)?),
EventType::DeviceDisconnected => DeviceDisconnected(from_str(data)?),
EventType::DeviceDiscovered => DeviceDiscovered(from_str(data)?),
EventType::DevicePaused => DevicePaused(from_str(data)?),
EventType::DeviceRejected => DeviceRejected(from_str(data)?),
EventType::DeviceResumed => DeviceResumed(from_str(data)?),
EventType::DownloadProgress => DownloadProgress(from_str(data)?),
EventType::FolderCompletion => FolderCompletion(from_str(data)?),
EventType::FolderErrors => FolderErrors(from_str(data)?),
EventType::FolderRejected => FolderRejected(from_str(data)?),
EventType::FolderScanProgress => FolderScanProgress(from_str(data)?),
EventType::FolderSummary => FolderSummary(from_str(data)?),
EventType::ItemFinished => ItemFinished(from_str(data)?),
EventType::ItemStarted => ItemStarted(from_str(data)?),
EventType::ListenAddressesChanged => ListenAddressesChanged(from_str(data)?),
EventType::LocalChangeDetected => LocalChangeDetected(from_str(data)?),
EventType::LocalIndexUpdated => LocalIndexUpdated(from_str(data)?),
EventType::LoginAttempt => LoginAttempt(from_str(data)?),
EventType::RemoteChangeDetected => RemoteChangeDetected(from_str(data)?),
EventType::RemoteDownloadProgress => RemoteDownloadProgress(from_str(data)?),
EventType::RemoteIndexUpdated => RemoteIndexUpdated(from_str(data)?),
EventType::Starting => Starting(from_str(data)?),
EventType::StartupComplete => StartupComplete,
EventType::StateChanged => StateChanged(from_str(data)?),
},
})
}
}
pub struct EventStream<C> {
connection: UnsafeCell<Connection<C>>,
events: Option<UnsafeCell<Vec<EventType>>>,
state: State,
since: Option<u64>,
}
enum State {
Init,
Buffer(Vec<Event>),
Future(Pin<Box<dyn Future<Output = Fallible<Vec<Event>>>>>),
}
impl<C> EventStream<C> {
pub(crate) fn new(connection: Connection<C>, events: Option<Vec<EventType>>) -> Self {
Self {
connection: UnsafeCell::new(connection),
events: events.map(UnsafeCell::new),
state: State::Init,
since: None,
}
}
}
impl<C: HttpClient> EventStream<C> {
fn queue_next_state(&mut self, limit: Option<u64>) {
let connection = unsafe { &*self.connection.get() };
let events = self.events.as_ref().map(|e| &unsafe { &*e.get() }[..]);
self.state = State::Future(Box::pin(connection.get_events(events, self.since, limit)));
}
}
impl<C: HttpClient> Stream for EventStream<C> {
type Item = Fallible<Event>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
match &mut self.state {
State::Future(fut) => match ready!(fut.as_mut().poll(cx)) {
Ok(mut data) => {
data.reverse();
if let Some(event) = data.pop() {
self.since = Some(event.id);
self.state = State::Buffer(data);
Poll::Ready(Some(Ok(event)))
} else {
self.queue_next_state(None);
Poll::Pending
}
}
Err(err) => {
self.queue_next_state(None);
Poll::Ready(Some(Err(err)))
}
},
State::Buffer(data) => {
if let Some(event) = data.pop() {
self.since = Some(event.id);
Poll::Ready(Some(Ok(event)))
} else {
self.queue_next_state(None);
Poll::Pending
}
}
State::Init => {
self.queue_next_state(Some(1));
Poll::Pending
}
}
}
}