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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
use deno_core::error::bad_resource_id;
use deno_core::error::AnyError;
use deno_core::include_js_files;
use deno_core::op_async;
use deno_core::op_sync;
use deno_core::AsyncRefCell;
use deno_core::Extension;
use deno_core::OpState;
use deno_core::RcRef;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::ZeroCopyBuf;
use std::borrow::Cow;
use std::cell::RefCell;
use std::path::PathBuf;
use std::rc::Rc;
use tokio::io::AsyncReadExt;
use tokio::io::AsyncWriteExt;
struct BroadcastChannelResource(AsyncRefCell<tokio::fs::File>);
impl Resource for BroadcastChannelResource {
fn name(&self) -> Cow<str> {
"broadcastChannel".into()
}
}
pub fn op_broadcast_open(
state: &mut OpState,
name: String,
_bufs: Option<ZeroCopyBuf>,
) -> Result<ResourceId, AnyError> {
let path = PathBuf::from("./");
std::fs::create_dir_all(&path)?;
let file = std::fs::OpenOptions::new()
.create(true)
.append(true)
.read(true)
.open(path.join(format!("broadcast_{}", name)))?;
let rid =
state
.resource_table
.add(BroadcastChannelResource(AsyncRefCell::new(
tokio::fs::File::from_std(file),
)));
Ok(rid)
}
pub async fn op_broadcast_send(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
buf: Option<ZeroCopyBuf>,
) -> Result<(), AnyError> {
let state = state.borrow_mut();
let resource = state
.resource_table
.get::<BroadcastChannelResource>(rid)
.ok_or_else(bad_resource_id)?;
let mut file = RcRef::map(&resource, |r| &r.0).borrow_mut().await;
let buffer_data = buf.unwrap();
let mut data = vec![];
data.extend_from_slice(&(buffer_data.len() as u64).to_ne_bytes());
data.extend_from_slice(&buffer_data);
file.write_all(&data).await?;
Ok(())
}
pub async fn op_broadcast_next_event(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
_bufs: Option<ZeroCopyBuf>,
) -> Result<Vec<u8>, AnyError> {
let resource = {
let state = state.borrow_mut();
state
.resource_table
.get::<BroadcastChannelResource>(rid)
.ok_or_else(bad_resource_id)?
};
let mut file = RcRef::map(&resource, |r| &r.0).borrow_mut().await;
let size = match file.read_u64().await {
Ok(s) => s,
Err(e) => {
return match e.kind() {
deno_core::futures::io::ErrorKind::UnexpectedEof => Ok(vec![]),
_ => Err(e.into()),
}
}
};
let mut data = vec![0u8; size as usize];
match file.read_exact(&mut data).await {
Ok(s) => s,
Err(e) => {
return match e.kind() {
deno_core::futures::io::ErrorKind::UnexpectedEof => Ok(vec![]),
_ => Err(e.into()),
}
}
};
Ok(data)
}
pub fn init() -> Extension {
Extension::builder()
.js(include_js_files!(
prefix "deno:extensions/broadcast_channel",
"01_broadcast_channel.js",
))
.ops(vec![
("op_broadcast_open", op_sync(op_broadcast_open)),
("op_broadcast_send", op_async(op_broadcast_send)),
("op_broadcast_next_event", op_async(op_broadcast_next_event)),
])
.build()
}
pub fn get_declaration() -> PathBuf {
PathBuf::from(env!("CARGO_MANIFEST_DIR"))
.join("lib.deno_broadcast_channel.d.ts")
}
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