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119 lines
3 KiB
Rust
119 lines
3 KiB
Rust
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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pub use crate::libdeno::OpId;
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use crate::PinnedBuf;
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use futures::Future;
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use std::collections::HashMap;
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pub type Buf = Box<[u8]>;
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pub type OpAsyncFuture<E> = Box<dyn Future<Item = Buf, Error = E> + Send>;
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pub(crate) type PendingOpFuture =
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Box<dyn Future<Item = (OpId, Buf), Error = CoreError> + Send>;
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pub type OpResult<E> = Result<Op<E>, E>;
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pub enum Op<E> {
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Sync(Buf),
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Async(OpAsyncFuture<E>),
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}
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pub type CoreError = ();
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pub type CoreOp = Op<CoreError>;
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/// Main type describing op
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type OpDispatcher = dyn Fn(&[u8], Option<PinnedBuf>) -> CoreOp;
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#[derive(Default)]
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pub struct OpRegistry {
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dispatchers: Vec<Box<OpDispatcher>>,
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name_to_id: HashMap<String, OpId>,
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}
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impl OpRegistry {
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pub fn new() -> Self {
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let mut registry = Self::default();
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let op_id = registry.register("ops", |_, _| {
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// ops is a special op which is handled in call.
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unreachable!()
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});
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assert_eq!(op_id, 0);
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registry
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}
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pub fn register<F>(&mut self, name: &str, op: F) -> OpId
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where
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F: Fn(&[u8], Option<PinnedBuf>) -> CoreOp + Send + Sync + 'static,
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{
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let op_id = self.dispatchers.len() as u32;
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let existing = self.name_to_id.insert(name.to_string(), op_id);
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assert!(
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existing.is_none(),
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format!("Op already registered: {}", name)
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);
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self.dispatchers.push(Box::new(op));
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op_id
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}
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fn json_map(&self) -> Buf {
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let op_map_json = serde_json::to_string(&self.name_to_id).unwrap();
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op_map_json.as_bytes().to_owned().into_boxed_slice()
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}
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/// This function returns None only if op with given id doesn't exist in registry.
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pub fn call(
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&self,
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op_id: OpId,
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control: &[u8],
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zero_copy_buf: Option<PinnedBuf>,
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) -> Option<CoreOp> {
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// Op with id 0 has special meaning - it's a special op that is always
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// provided to retrieve op id map. The map consists of name to `OpId`
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// mappings.
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if op_id == 0 {
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return Some(Op::Sync(self.json_map()));
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}
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let d = match self.dispatchers.get(op_id as usize) {
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Some(handler) => &*handler,
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None => return None,
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};
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Some(d(control, zero_copy_buf))
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}
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}
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#[test]
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fn test_op_registry() {
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use std::sync::atomic;
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use std::sync::Arc;
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let mut op_registry = OpRegistry::new();
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let c = Arc::new(atomic::AtomicUsize::new(0));
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let c_ = c.clone();
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let test_id = op_registry.register("test", move |_, _| {
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c_.fetch_add(1, atomic::Ordering::SeqCst);
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CoreOp::Sync(Box::new([]))
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});
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assert!(test_id != 0);
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let mut expected = HashMap::new();
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expected.insert("ops".to_string(), 0);
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expected.insert("test".to_string(), 1);
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assert_eq!(op_registry.name_to_id, expected);
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let res = op_registry.call(test_id, &[], None).unwrap();
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if let Op::Sync(buf) = res {
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assert_eq!(buf.len(), 0);
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} else {
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unreachable!();
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}
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assert_eq!(c.load(atomic::Ordering::SeqCst), 1);
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let res = op_registry.call(100, &[], None);
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assert!(res.is_none());
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}
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