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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use crate::MessageKind;
use crate::SendValue;
use crate::Upgraded;
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::op;
use deno_core::AsyncRefCell;
use deno_core::OpState;
use deno_core::RcRef;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::StringOrBuffer;
use deno_core::ZeroCopyBuf;
use std::borrow::Cow;
use std::cell::RefCell;
use std::pin::Pin;
use std::rc::Rc;
use fastwebsockets::CloseCode;
use fastwebsockets::FragmentCollector;
use fastwebsockets::Frame;
use fastwebsockets::OpCode;
use fastwebsockets::WebSocket;
pub struct ServerWebSocket {
ws: AsyncRefCell<FragmentCollector<Pin<Box<dyn Upgraded>>>>,
}
impl ServerWebSocket {
#[inline]
pub async fn write_frame(
self: Rc<Self>,
frame: Frame,
) -> Result<(), AnyError> {
// SAFETY: fastwebsockets only needs a mutable reference to the WebSocket
// to populate the write buffer. We encounter an await point when writing
// to the socket after the frame has already been written to the buffer.
let ws = unsafe { &mut *self.ws.as_ptr() };
ws.write_frame(frame)
.await
.map_err(|err| type_error(err.to_string()))?;
Ok(())
}
}
impl Resource for ServerWebSocket {
fn name(&self) -> Cow<str> {
"serverWebSocket".into()
}
}
pub async fn ws_create_server_stream(
state: &Rc<RefCell<OpState>>,
transport: Pin<Box<dyn Upgraded>>,
) -> Result<ResourceId, AnyError> {
let mut ws = WebSocket::after_handshake(transport);
ws.set_writev(false);
ws.set_auto_close(true);
ws.set_auto_pong(true);
let ws_resource = ServerWebSocket {
ws: AsyncRefCell::new(FragmentCollector::new(ws)),
};
let resource_table = &mut state.borrow_mut().resource_table;
let rid = resource_table.add(ws_resource);
Ok(rid)
}
#[op]
pub async fn op_server_ws_send_binary(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
data: ZeroCopyBuf,
) -> Result<(), AnyError> {
let resource = state
.borrow_mut()
.resource_table
.get::<ServerWebSocket>(rid)?;
resource
.write_frame(Frame::new(true, OpCode::Binary, None, data.to_vec()))
.await
}
#[op]
pub async fn op_server_ws_send_text(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
data: String,
) -> Result<(), AnyError> {
let resource = state
.borrow_mut()
.resource_table
.get::<ServerWebSocket>(rid)?;
resource
.write_frame(Frame::new(true, OpCode::Text, None, data.into_bytes()))
.await
}
#[op]
pub async fn op_server_ws_send(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
value: SendValue,
) -> Result<(), AnyError> {
let msg = match value {
SendValue::Text(text) => {
Frame::new(true, OpCode::Text, None, text.into_bytes())
}
SendValue::Binary(buf) => {
Frame::new(true, OpCode::Binary, None, buf.to_vec())
}
SendValue::Pong => Frame::new(true, OpCode::Pong, None, vec![]),
SendValue::Ping => Frame::new(true, OpCode::Ping, None, vec![]),
};
let resource = state
.borrow_mut()
.resource_table
.get::<ServerWebSocket>(rid)?;
resource.write_frame(msg).await
}
#[op(deferred)]
pub async fn op_server_ws_close(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
code: Option<u16>,
reason: Option<String>,
) -> Result<(), AnyError> {
let resource = state
.borrow_mut()
.resource_table
.get::<ServerWebSocket>(rid)?;
let frame = reason
.map(|reason| Frame::close(code.unwrap_or(1005), reason.as_bytes()))
.unwrap_or_else(|| Frame::close_raw(vec![]));
resource.write_frame(frame).await
}
#[op(deferred)]
pub async fn op_server_ws_next_event(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
) -> Result<(u16, StringOrBuffer), AnyError> {
let resource = state
.borrow_mut()
.resource_table
.get::<ServerWebSocket>(rid)?;
let mut ws = RcRef::map(&resource, |r| &r.ws).borrow_mut().await;
let val = match ws.read_frame().await {
Ok(val) => val,
Err(err) => {
return Ok((
MessageKind::Error as u16,
StringOrBuffer::String(err.to_string()),
))
}
};
let res = match val.opcode {
OpCode::Text => (
MessageKind::Text as u16,
StringOrBuffer::String(String::from_utf8(val.payload).unwrap()),
),
OpCode::Binary => (
MessageKind::Binary as u16,
StringOrBuffer::Buffer(val.payload.into()),
),
OpCode::Close => {
if val.payload.len() < 2 {
return Ok((1005, StringOrBuffer::String("".to_string())));
}
let close_code =
CloseCode::from(u16::from_be_bytes([val.payload[0], val.payload[1]]));
let reason = String::from_utf8(val.payload[2..].to_vec()).unwrap();
(close_code.into(), StringOrBuffer::String(reason))
}
OpCode::Ping => (
MessageKind::Ping as u16,
StringOrBuffer::Buffer(vec![].into()),
),
OpCode::Pong => (
MessageKind::Pong as u16,
StringOrBuffer::Buffer(vec![].into()),
),
OpCode::Continuation => {
return Err(type_error("Unexpected continuation frame"))
}
};
Ok(res)
}
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