mirror of
https://github.com/denoland/deno.git
synced 2024-12-23 07:44:48 -05:00
111 lines
2.7 KiB
Rust
111 lines
2.7 KiB
Rust
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
|
|
pub use crate::libdeno::OpId;
|
|
use crate::PinnedBuf;
|
|
use futures::Future;
|
|
use std::collections::HashMap;
|
|
|
|
pub type Buf = Box<[u8]>;
|
|
|
|
pub type OpAsyncFuture<E> = Box<dyn Future<Item = Buf, Error = E> + Send>;
|
|
|
|
pub(crate) type PendingOpFuture =
|
|
Box<dyn Future<Item = (OpId, Buf), Error = CoreError> + Send>;
|
|
|
|
pub type OpResult<E> = Result<Op<E>, E>;
|
|
|
|
pub enum Op<E> {
|
|
Sync(Buf),
|
|
Async(OpAsyncFuture<E>),
|
|
}
|
|
|
|
pub type CoreError = ();
|
|
|
|
pub type CoreOp = Op<CoreError>;
|
|
|
|
/// Main type describing op
|
|
type OpDispatcher = dyn Fn(&[u8], Option<PinnedBuf>) -> CoreOp;
|
|
|
|
#[derive(Default)]
|
|
pub struct OpRegistry {
|
|
dispatchers: Vec<Box<OpDispatcher>>,
|
|
name_to_id: HashMap<String, OpId>,
|
|
}
|
|
|
|
impl OpRegistry {
|
|
pub fn new() -> Self {
|
|
let mut registry = Self::default();
|
|
let op_id = registry.register("ops", |_, _| {
|
|
// ops is a special op which is handled in call.
|
|
unreachable!()
|
|
});
|
|
assert_eq!(op_id, 0);
|
|
registry
|
|
}
|
|
|
|
pub fn register<F>(&mut self, name: &str, op: F) -> OpId
|
|
where
|
|
F: Fn(&[u8], Option<PinnedBuf>) -> CoreOp + Send + Sync + 'static,
|
|
{
|
|
let op_id = self.dispatchers.len() as u32;
|
|
|
|
let existing = self.name_to_id.insert(name.to_string(), op_id);
|
|
assert!(
|
|
existing.is_none(),
|
|
format!("Op already registered: {}", name)
|
|
);
|
|
|
|
self.dispatchers.push(Box::new(op));
|
|
op_id
|
|
}
|
|
|
|
fn json_map(&self) -> Buf {
|
|
let op_map_json = serde_json::to_string(&self.name_to_id).unwrap();
|
|
op_map_json.as_bytes().to_owned().into_boxed_slice()
|
|
}
|
|
|
|
pub fn call(
|
|
&self,
|
|
op_id: OpId,
|
|
control: &[u8],
|
|
zero_copy_buf: Option<PinnedBuf>,
|
|
) -> CoreOp {
|
|
// Op with id 0 has special meaning - it's a special op that is always
|
|
// provided to retrieve op id map. The map consists of name to `OpId`
|
|
// mappings.
|
|
if op_id == 0 {
|
|
return Op::Sync(self.json_map());
|
|
}
|
|
|
|
let d = &*self.dispatchers.get(op_id as usize).expect("Op not found!");
|
|
d(control, zero_copy_buf)
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_op_registry() {
|
|
use std::sync::atomic;
|
|
use std::sync::Arc;
|
|
let mut op_registry = OpRegistry::new();
|
|
|
|
let c = Arc::new(atomic::AtomicUsize::new(0));
|
|
let c_ = c.clone();
|
|
|
|
let test_id = op_registry.register("test", move |_, _| {
|
|
c_.fetch_add(1, atomic::Ordering::SeqCst);
|
|
CoreOp::Sync(Box::new([]))
|
|
});
|
|
assert!(test_id != 0);
|
|
|
|
let mut expected = HashMap::new();
|
|
expected.insert("ops".to_string(), 0);
|
|
expected.insert("test".to_string(), 1);
|
|
assert_eq!(op_registry.name_to_id, expected);
|
|
|
|
let res = op_registry.call(test_id, &[], None);
|
|
if let Op::Sync(buf) = res {
|
|
assert_eq!(buf.len(), 0);
|
|
} else {
|
|
unreachable!();
|
|
}
|
|
assert_eq!(c.load(atomic::Ordering::SeqCst), 1);
|
|
}
|