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use crate::{
connection::{BaseConnection, Buffer},
utils::Error,
};
use async_std::{io::BufReader, net::TcpStream, prelude::*, task};
use async_trait::async_trait;
use futures::{
channel::{
mpsc::{unbounded, UnboundedReceiver, UnboundedSender},
oneshot::{channel, Sender},
},
future::{self, Either},
};
use futures_util::SinkExt;
pub struct InetSocketConnection {
connection_setup: bool,
read_data_receiver: Option<UnboundedReceiver<Vec<u8>>>,
write_data_sender: Option<UnboundedSender<Vec<u8>>>,
close_sender: Option<UnboundedSender<()>>,
socket_path: String,
}
impl InetSocketConnection {
pub fn new(socket_path: String) -> Self {
InetSocketConnection {
connection_setup: false,
read_data_receiver: None,
write_data_sender: None,
close_sender: None,
socket_path,
}
}
}
async fn read_data_from_socket(
port: String,
init_sender: Sender<Result<(), Error>>,
mut read_sender: UnboundedSender<Vec<u8>>,
mut write_receiver: UnboundedReceiver<Vec<u8>>,
mut close_receiver: UnboundedReceiver<()>,
) {
let result = TcpStream::connect(port).await;
if let Err(err) = result {
init_sender
.send(Err(Error::Internal(format!("{}", err))))
.unwrap_or(());
return;
}
let client = result.unwrap();
init_sender.send(Ok(())).unwrap_or(());
let reader = BufReader::new(&client);
let mut lines = reader.lines();
let mut read_future = lines.next();
let mut write_future = write_receiver.next();
let mut close_future = close_receiver.next();
let mut read_or_write_future = future::select(read_future, write_future);
while let Either::Left((read_write_future, next_close_future)) =
future::select(read_or_write_future, close_future).await
{
close_future = next_close_future;
match read_write_future {
Either::Left((read_future_result, next_write_future)) => {
read_future = lines.next();
write_future = next_write_future;
read_or_write_future = future::select(read_future, write_future);
if let Some(Ok(line)) = read_future_result {
let result = read_sender.send(line.as_bytes().to_vec()).await;
if let Err(err) = result {
println!("Error queing data from the socket to the module: {}", err);
}
}
}
Either::Right((write_future_result, next_read_future)) => {
read_future = next_read_future;
write_future = write_receiver.next();
read_or_write_future = future::select(read_future, write_future);
if let Some(bytes) = write_future_result {
let mut socket = &client;
if let Err(err) = socket.write_all(&bytes).await {
println!("Error while sending data to socket: {}", err);
}
}
}
}
}
drop(lines);
let result = read_sender.close().await;
if let Err(err) = result {
println!("Error closing the MPSC sender to queue data: {}", err);
}
write_receiver.close();
close_receiver.close();
}
#[async_trait]
impl BaseConnection for InetSocketConnection {
async fn setup_connection(&mut self) -> Result<(), Error> {
if self.connection_setup {
panic!("Cannot call setup_connection() more than once!");
}
let (read_data_sender, read_data_receiver) = unbounded::<Vec<u8>>();
let (write_data_sender, write_data_receiver) = unbounded::<Vec<u8>>();
let (close_sender, close_receiver) = unbounded::<()>();
let (init_sender, init_receiver) = channel::<Result<(), Error>>();
self.read_data_receiver = Some(read_data_receiver);
self.write_data_sender = Some(write_data_sender);
self.close_sender = Some(close_sender);
let socket_path = self.socket_path.clone();
task::spawn(async {
read_data_from_socket(
socket_path,
init_sender,
read_data_sender,
write_data_receiver,
close_receiver,
)
.await;
});
self.connection_setup = true;
init_receiver.await.unwrap()
}
async fn close_connection(&mut self) {
if !self.connection_setup || self.close_sender.is_none() {
panic!("Cannot close a connection that hasn't been established yet. Did you forget to call setup_connection()?");
}
let mut sender = &self.close_sender.as_ref().unwrap().clone();
if let Err(err) = sender.send(()).await {
println!("Error attempting to close connection: {}", err);
}
}
async fn send(&mut self, buffer: Buffer) {
if !self.connection_setup || self.write_data_sender.is_none() {
panic!("Cannot send data to a connection that hasn't been established yet. Did you forget to await the call to setup_connection()?");
}
let mut sender = &self.write_data_sender.as_ref().unwrap().clone();
if let Err(err) = sender.send(buffer).await {
println!("Error attempting to send data to connection: {}", err);
}
}
fn get_data_receiver(&mut self) -> UnboundedReceiver<Buffer> {
if !self.connection_setup || self.read_data_receiver.is_none() {
panic!("Cannot get read sender to a connection that hasn't been established yet. Did you forget to await the call to setup_connection()?");
}
self.read_data_receiver.take().unwrap()
}
fn clone_write_sender(&self) -> UnboundedSender<Buffer> {
if !self.connection_setup || self.write_data_sender.is_none() {
panic!("Cannot get write sender of a connection that hasn't been established yet. Did you forget to await the call to setup_connection()?");
}
self.write_data_sender.as_ref().unwrap().clone()
}
}