1
0
Fork 0
mirror of https://github.com/denoland/deno.git synced 2024-12-22 15:24:46 -05:00
denoland-deno/ext/broadcast_channel/lib.rs
Matt Mastracci 3487fde236
perf(core) Reduce copying and cloning in extension initialization (#18252)
Follow-up to #18210:

* we are passing the generated `cfg` object into the state function
rather than passing individual config fields
 * reduce cloning dramatically by making the state_fn `FnOnce`
 * `take` for `ExtensionBuilder` to avoid more unnecessary copies
 * renamed `config` to `options`
2023-03-17 22:15:27 +00:00

130 lines
3 KiB
Rust

// Copyright 2018-2023 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::error::AnyError;
use deno_core::op;
use deno_core::OpState;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::ZeroCopyBuf;
#[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); // --unstable
#[op]
pub fn op_broadcast_subscribe<BC>(
state: &mut OpState,
) -> Result<ResourceId, AnyError>
where
BC: BroadcastChannel + 'static,
{
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))
}
#[op]
pub fn op_broadcast_unsubscribe<BC>(
state: &mut OpState,
rid: ResourceId,
) -> Result<(), AnyError>
where
BC: BroadcastChannel + 'static,
{
let resource = state.resource_table.get::<BC::Resource>(rid)?;
let bc = state.borrow::<BC>();
bc.unsubscribe(&resource)
}
#[op]
pub async fn op_broadcast_send<BC>(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
name: String,
buf: ZeroCopyBuf,
) -> Result<(), AnyError>
where
BC: BroadcastChannel + 'static,
{
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
}
#[op]
pub async fn op_broadcast_recv<BC>(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
) -> Result<Option<Message>, AnyError>
where
BC: BroadcastChannel + 'static,
{
let resource = state.borrow().resource_table.get::<BC::Resource>(rid)?;
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,
unstable: bool,
},
state = |state, options| {
state.put(options.bc);
state.put(Unstable(options.unstable));
},
);
pub fn get_declaration() -> PathBuf {
PathBuf::from(env!("CARGO_MANIFEST_DIR"))
.join("lib.deno_broadcast_channel.d.ts")
}