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use futures::future::poll_fn;
use futures::task::Poll;
use tokio::net::TcpStream;
use tokio::net::tcp::{OwnedReadHalf, OwnedWriteHalf};
use tokio::io::*;
use tokio::sync::Mutex;
use super::events::Event;
use super::events::stream_mapper::*;
use super::commands::stream_mapper::CommandToByteMapper;
use super::commands::Command;
type EventClosure = dyn FnMut(Event) + Sync + Send + 'static;
type EventClosureMutex = Box<EventClosure>;
pub fn event_handler<F>(f: F) -> EventClosureMutex
where F: FnMut(Event) + Sync + Send + 'static
{
Box::new(f)
}
pub struct FlicClient {
reader: Mutex<OwnedReadHalf>,
writer: Mutex<OwnedWriteHalf>,
is_running: Mutex<bool>,
command_mapper: Mutex<CommandToByteMapper>,
event_mapper: Mutex<ByteToEventMapper>,
map: Mutex<Vec<EventClosureMutex>>,
}
impl FlicClient {
pub async fn new(conn: &str) -> Result<FlicClient> {
match TcpStream::connect(conn).await {
Ok(stream) => {
let (reader, writer) = stream.into_split();
Ok(FlicClient{
reader: Mutex::new(reader),
writer: Mutex::new(writer),
is_running: Mutex::new(true),
command_mapper: Mutex::new(CommandToByteMapper::new()),
event_mapper: Mutex::new(ByteToEventMapper::new()),
map: Mutex::new(vec![]),
})
}
Err(err) => Err(err)
}
}
pub async fn register_event_handler(self, event: EventClosureMutex) -> Self {
self.map.lock().await.push(event);
self
}
pub async fn listen(&self) {
while *self.is_running.lock().await {
let mut reader = self.reader.lock().await;
if let Ok(size) = poll_fn(|cx| {
let mut buf = [0; 1];
match reader.poll_peek(cx, &mut buf) {
Poll::Pending => Poll::Ready(Ok(0_usize)),
Poll::Ready(all) => Poll::Ready(all),
}
}).await{
if size > 0 {
let mut buffer = vec![];
if let Some(_) = reader.read_buf(&mut buffer).await.ok() {
for b in buffer.iter() {
match self.event_mapper.lock().await.map(*b) {
EventResult::Some(Event::NoOp) => {}
EventResult::Some(event) => {
let mut map = self.map.lock().await;
for ref mut f in &mut *map {
f(event.clone());
}
}
_ => {}
}
}
}
}
}
}
}
pub async fn stop(&self) {
*self.is_running.lock().await = false;
}
pub async fn submit(&self, cmd: Command) {
let mut writer = self.writer.lock().await;
for b in self.command_mapper.lock().await.map(cmd) {
let _ = writer.write_u8(b).await;
}
}
}
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