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use std::collections::VecDeque;
use std::marker::PhantomData;
use std::pin::Pin;
use async_tungstenite::WebSocketStream;
use futures::stream::Stream;
use futures::task::{Context, Poll};
use futures::Sink;
use chromiumoxide_cdp::cdp::browser_protocol::target::SessionId;
use chromiumoxide_types::{CallId, EventMessage, Message, MethodCall, MethodId};
use crate::error::CdpError;
use crate::error::Result;
cfg_if::cfg_if! {
if #[cfg(feature = "async-std-runtime")] {
use async_tungstenite::async_std::ConnectStream;
} else if #[cfg(feature = "tokio-runtime")] {
use async_tungstenite::tokio::ConnectStream;
}
}
#[must_use = "streams do nothing unless polled"]
#[derive(Debug)]
pub struct Connection<T: EventMessage> {
pending_commands: VecDeque<MethodCall>,
ws: WebSocketStream<ConnectStream>,
next_id: usize,
needs_flush: bool,
pending_flush: Option<MethodCall>,
_marker: PhantomData<T>,
}
impl<T: EventMessage + Unpin> Connection<T> {
pub async fn connect(debug_ws_url: impl AsRef<str>) -> Result<Self> {
cfg_if::cfg_if! {
if #[cfg(feature = "async-std-runtime")] {
let (ws, _) = async_tungstenite::async_std::connect_async(debug_ws_url.as_ref()).await?;
} else if #[cfg(feature = "tokio-runtime")] {
let (ws, _) = async_tungstenite::tokio::connect_async(debug_ws_url.as_ref()).await?;
}
}
Ok(Self {
pending_commands: Default::default(),
ws,
next_id: 0,
needs_flush: false,
pending_flush: None,
_marker: Default::default(),
})
}
}
impl<T: EventMessage> Connection<T> {
fn next_call_id(&mut self) -> CallId {
let id = CallId::new(self.next_id);
self.next_id = self.next_id.wrapping_add(1);
id
}
pub fn submit_command(
&mut self,
method: MethodId,
session_id: Option<SessionId>,
params: serde_json::Value,
) -> serde_json::Result<CallId> {
let id = self.next_call_id();
let call = MethodCall {
id,
method,
session_id: session_id.map(Into::into),
params,
};
self.pending_commands.push_back(call);
Ok(id)
}
fn start_send_next(&mut self, cx: &mut Context<'_>) -> Result<()> {
if self.needs_flush {
if let Poll::Ready(Ok(())) = Sink::poll_flush(Pin::new(&mut self.ws), cx) {
self.needs_flush = false;
}
}
if self.pending_flush.is_none() && !self.needs_flush {
if let Some(cmd) = self.pending_commands.pop_front() {
let msg = serde_json::to_string(&cmd)?;
Sink::start_send(Pin::new(&mut self.ws), msg.into())?;
self.pending_flush = Some(cmd);
}
}
Ok(())
}
}
impl<T: EventMessage + Unpin> Stream for Connection<T> {
type Item = Result<Message<T>>;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let pin = self.get_mut();
if let Err(err) = pin.start_send_next(cx) {
return Poll::Ready(Some(Err(err)));
}
if let Some(call) = pin.pending_flush.take() {
if Sink::poll_ready(Pin::new(&mut pin.ws), cx).is_ready() {
pin.needs_flush = true;
} else {
pin.pending_flush = Some(call);
}
}
match Stream::poll_next(Pin::new(&mut pin.ws), cx) {
Poll::Ready(Some(Ok(msg))) => {
return match serde_json::from_slice::<Message<T>>(&msg.into_data()) {
Ok(msg) => Poll::Ready(Some(Ok(msg))),
Err(err) => Poll::Ready(Some(Err(err.into()))),
};
}
Poll::Ready(Some(Err(err))) => {
return Poll::Ready(Some(Err(CdpError::Ws(err))));
}
_ => {}
}
Poll::Pending
}
}