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mod in_memory_broadcast_channel;
pub use in_memory_broadcast_channel::InMemoryBroadcastChannel;
use async_trait::async_trait;
use deno_core::error::AnyError;
use deno_core::include_js_files;
use deno_core::op_async;
use deno_core::op_sync;
use deno_core::Extension;
use deno_core::OpState;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::ZeroCopyBuf;
use std::cell::RefCell;
use std::path::PathBuf;
use std::rc::Rc;
#[async_trait]
pub trait BroadcastChannel: Clone {
type Resource: Resource;
fn subscribe(&self) -> Result<Self::Resource, AnyError>;
fn unsubscribe(&self, resource: &Self::Resource) -> Result<(), AnyError>;
async fn send(
&self,
resource: &Self::Resource,
name: String,
data: Vec<u8>,
) -> Result<(), AnyError>;
async fn recv(
&self,
resource: &Self::Resource,
) -> Result<Option<Message>, AnyError>;
}
pub type Message = (String, Vec<u8>);
struct Unstable(bool);
pub fn op_broadcast_subscribe<BC: BroadcastChannel + 'static>(
state: &mut OpState,
_: (),
_: (),
) -> Result<ResourceId, AnyError> {
let unstable = state.borrow::<Unstable>().0;
if !unstable {
eprintln!(
"Unstable API 'BroadcastChannel'. The --unstable flag must be provided.",
);
std::process::exit(70);
}
let bc = state.borrow::<BC>();
let resource = bc.subscribe()?;
Ok(state.resource_table.add(resource))
}
pub fn op_broadcast_unsubscribe<BC: BroadcastChannel + 'static>(
state: &mut OpState,
rid: ResourceId,
_buf: (),
) -> Result<(), AnyError> {
let resource = state.resource_table.get::<BC::Resource>(rid)?;
let bc = state.borrow::<BC>();
bc.unsubscribe(&resource)
}
pub async fn op_broadcast_send<BC: BroadcastChannel + 'static>(
state: Rc<RefCell<OpState>>,
(rid, name): (ResourceId, String),
buf: ZeroCopyBuf,
) -> Result<(), AnyError> {
let resource = state.borrow().resource_table.get::<BC::Resource>(rid)?;
let bc = state.borrow().borrow::<BC>().clone();
bc.send(&resource, name, buf.to_vec()).await
}
pub async fn op_broadcast_recv<BC: BroadcastChannel + 'static>(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
_: (),
) -> Result<Option<Message>, AnyError> {
let resource = state.borrow().resource_table.get::<BC::Resource>(rid)?;
let bc = state.borrow().borrow::<BC>().clone();
bc.recv(&resource).await
}
pub fn init<BC: BroadcastChannel + 'static>(
bc: BC,
unstable: bool,
) -> Extension {
Extension::builder()
.js(include_js_files!(
prefix "deno:ext/broadcast_channel",
"01_broadcast_channel.js",
))
.ops(vec![
(
"op_broadcast_subscribe",
op_sync(op_broadcast_subscribe::<BC>),
),
(
"op_broadcast_unsubscribe",
op_sync(op_broadcast_unsubscribe::<BC>),
),
("op_broadcast_send", op_async(op_broadcast_send::<BC>)),
("op_broadcast_recv", op_async(op_broadcast_recv::<BC>)),
])
.state(move |state| {
state.put(bc.clone());
state.put(Unstable(unstable));
Ok(())
})
.build()
}
pub fn get_declaration() -> PathBuf {
PathBuf::from(env!("CARGO_MANIFEST_DIR"))
.join("lib.deno_broadcast_channel.d.ts")
}