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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
mod in_memory_broadcast_channel;
pub use in_memory_broadcast_channel::InMemoryBroadcastChannel;
pub use in_memory_broadcast_channel::InMemoryBroadcastChannelResource;
use std::cell::RefCell;
use std::path::PathBuf;
use std::rc::Rc;
use async_trait::async_trait;
use deno_core::op2;
use deno_core::JsBuffer;
use deno_core::OpState;
use deno_core::Resource;
use deno_core::ResourceId;
use tokio::sync::broadcast::error::SendError as BroadcastSendError;
use tokio::sync::mpsc::error::SendError as MpscSendError;
pub const UNSTABLE_FEATURE_NAME: &str = "broadcast-channel";
#[derive(Debug, thiserror::Error)]
pub enum BroadcastChannelError {
#[error(transparent)]
Resource(deno_core::error::AnyError),
#[error(transparent)]
MPSCSendError(MpscSendError<Box<dyn std::fmt::Debug + Send + Sync>>),
#[error(transparent)]
BroadcastSendError(
BroadcastSendError<Box<dyn std::fmt::Debug + Send + Sync>>,
),
#[error(transparent)]
Other(deno_core::error::AnyError),
}
impl<T: std::fmt::Debug + Send + Sync + 'static> From<MpscSendError<T>>
for BroadcastChannelError
{
fn from(value: MpscSendError<T>) -> Self {
BroadcastChannelError::MPSCSendError(MpscSendError(Box::new(value.0)))
}
}
impl<T: std::fmt::Debug + Send + Sync + 'static> From<BroadcastSendError<T>>
for BroadcastChannelError
{
fn from(value: BroadcastSendError<T>) -> Self {
BroadcastChannelError::BroadcastSendError(BroadcastSendError(Box::new(
value.0,
)))
}
}
#[async_trait]
pub trait BroadcastChannel: Clone {
type Resource: Resource;
fn subscribe(&self) -> Result<Self::Resource, BroadcastChannelError>;
fn unsubscribe(
&self,
resource: &Self::Resource,
) -> Result<(), BroadcastChannelError>;
async fn send(
&self,
resource: &Self::Resource,
name: String,
data: Vec<u8>,
) -> Result<(), BroadcastChannelError>;
async fn recv(
&self,
resource: &Self::Resource,
) -> Result<Option<Message>, BroadcastChannelError>;
}
pub type Message = (String, Vec<u8>);
#[op2(fast)]
#[smi]
pub fn op_broadcast_subscribe<BC>(
state: &mut OpState,
) -> Result<ResourceId, BroadcastChannelError>
where
BC: BroadcastChannel + 'static,
{
state
.feature_checker
.check_or_exit(UNSTABLE_FEATURE_NAME, "BroadcastChannel");
let bc = state.borrow::<BC>();
let resource = bc.subscribe()?;
Ok(state.resource_table.add(resource))
}
#[op2(fast)]
pub fn op_broadcast_unsubscribe<BC>(
state: &mut OpState,
#[smi] rid: ResourceId,
) -> Result<(), BroadcastChannelError>
where
BC: BroadcastChannel + 'static,
{
let resource = state
.resource_table
.get::<BC::Resource>(rid)
.map_err(BroadcastChannelError::Resource)?;
let bc = state.borrow::<BC>();
bc.unsubscribe(&resource)
}
#[op2(async)]
pub async fn op_broadcast_send<BC>(
state: Rc<RefCell<OpState>>,
#[smi] rid: ResourceId,
#[string] name: String,
#[buffer] buf: JsBuffer,
) -> Result<(), BroadcastChannelError>
where
BC: BroadcastChannel + 'static,
{
let resource = state
.borrow()
.resource_table
.get::<BC::Resource>(rid)
.map_err(BroadcastChannelError::Resource)?;
let bc = state.borrow().borrow::<BC>().clone();
bc.send(&resource, name, buf.to_vec()).await
}
#[op2(async)]
#[serde]
pub async fn op_broadcast_recv<BC>(
state: Rc<RefCell<OpState>>,
#[smi] rid: ResourceId,
) -> Result<Option<Message>, BroadcastChannelError>
where
BC: BroadcastChannel + 'static,
{
let resource = state
.borrow()
.resource_table
.get::<BC::Resource>(rid)
.map_err(BroadcastChannelError::Resource)?;
let bc = state.borrow().borrow::<BC>().clone();
bc.recv(&resource).await
}
deno_core::extension!(deno_broadcast_channel,
deps = [ deno_webidl, deno_web ],
parameters = [BC: BroadcastChannel],
ops = [
op_broadcast_subscribe<BC>,
op_broadcast_unsubscribe<BC>,
op_broadcast_send<BC>,
op_broadcast_recv<BC>,
],
esm = [ "01_broadcast_channel.js" ],
options = {
bc: BC,
},
state = |state, options| {
state.put(options.bc);
},
);
pub fn get_declaration() -> PathBuf {
PathBuf::from(env!("CARGO_MANIFEST_DIR"))
.join("lib.deno_broadcast_channel.d.ts")
}
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