Add op_id argument to Deno.core.dispatch

Removes the magic number hack to switch between flatbuffers and the
minimal dispatcher.

Adds machinery to pass the op_id through the shared_queue.

cli/dispatch_minimal.rs

@@ -8,33 +8,26 @@ use crate::state::ThreadSafeState;
 use deno::Buf;
 use deno::CoreOp;
 use deno::Op;
+use deno::OpId;
 use deno::PinnedBuf;
 use futures::Future;
 
-const DISPATCH_MINIMAL_TOKEN: i32 = 0xCAFE;
-const OP_READ: i32 = 1;
-const OP_WRITE: i32 = 2;
+const OP_READ: OpId = 1;
+const OP_WRITE: OpId = 2;
 
 #[derive(Copy, Clone, Debug, PartialEq)]
 // This corresponds to RecordMinimal on the TS side.
 pub struct Record {
   pub promise_id: i32,
-  pub op_id: i32,
   pub arg: i32,
   pub result: i32,
 }
 
 impl Into<Buf> for Record {
   fn into(self) -> Buf {
-    let vec = vec![
-      DISPATCH_MINIMAL_TOKEN,
-      self.promise_id,
-      self.op_id,
-      self.arg,
-      self.result,
-    ];
+    let vec = vec![self.promise_id, self.arg, self.result];
     let buf32 = vec.into_boxed_slice();
-    let ptr = Box::into_raw(buf32) as *mut [u8; 5 * 4];
+    let ptr = Box::into_raw(buf32) as *mut [u8; 3 * 4];
     unsafe { Box::from_raw(ptr) }
   }
 }
@@ -48,32 +41,25 @@ pub fn parse_min_record(bytes: &[u8]) -> Option<Record> {
   let p32 = p as *const i32;
   let s = unsafe { std::slice::from_raw_parts(p32, bytes.len() / 4) };
 
-  if s.len() < 5 {
+  if s.len() != 3 {
     return None;
   }
   let ptr = s.as_ptr();
-  let ints = unsafe { std::slice::from_raw_parts(ptr, 5) };
-  if ints[0] != DISPATCH_MINIMAL_TOKEN {
-    return None;
-  }
+  let ints = unsafe { std::slice::from_raw_parts(ptr, 3) };
   Some(Record {
-    promise_id: ints[1],
-    op_id: ints[2],
-    arg: ints[3],
-    result: ints[4],
+    promise_id: ints[0],
+    arg: ints[1],
+    result: ints[2],
   })
 }
 
 #[test]
 fn test_parse_min_record() {
-  let buf = vec![
-    0xFE, 0xCA, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0,
-  ];
+  let buf = vec![1, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0];
   assert_eq!(
     parse_min_record(&buf),
     Some(Record {
       promise_id: 1,
-      op_id: 2,
       arg: 3,
       result: 4,
     })
@@ -88,11 +74,12 @@ fn test_parse_min_record() {
 
 pub fn dispatch_minimal(
   state: &ThreadSafeState,
+  op_id: OpId,
   mut record: Record,
   zero_copy: Option<PinnedBuf>,
 ) -> CoreOp {
   let is_sync = record.promise_id == 0;
-  let min_op = match record.op_id {
+  let min_op = match op_id {
     OP_READ => ops::read(record.arg, zero_copy),
     OP_WRITE => ops::write(record.arg, zero_copy),
     _ => unimplemented!(),

cli/ops.rs

@@ -27,14 +27,7 @@ use crate::tokio_write;
 use crate::version;
 use crate::worker::Worker;
 use atty;
-use deno::Buf;
-use deno::CoreOp;
-use deno::ErrBox;
-use deno::Loader;
-use deno::ModuleSpecifier;
-use deno::Op;
-use deno::OpResult;
-use deno::PinnedBuf;
+use deno::*;
 use flatbuffers::FlatBufferBuilder;
 use futures;
 use futures::Async;
@@ -82,17 +75,21 @@ fn empty_buf() -> Buf {
   Box::new([])
 }
 
+const FLATBUFFER_OP_ID: OpId = 44;
+
 pub fn dispatch_all(
   state: &ThreadSafeState,
+  op_id: OpId,
   control: &[u8],
   zero_copy: Option<PinnedBuf>,
   op_selector: OpSelector,
 ) -> CoreOp {
   let bytes_sent_control = control.len();
   let bytes_sent_zero_copy = zero_copy.as_ref().map(|b| b.len()).unwrap_or(0);
   let op = if let Some(min_record) = parse_min_record(control) {
-    dispatch_minimal(state, min_record, zero_copy)
+    dispatch_minimal(state, op_id, min_record, zero_copy)
   } else {
+    debug_assert_eq!(op_id, FLATBUFFER_OP_ID);
     dispatch_all_legacy(state, control, zero_copy, op_selector)
   };
   state.metrics_op_dispatched(bytes_sent_control, bytes_sent_zero_copy);

cli/state.rs

@@ -20,6 +20,7 @@ use deno::CoreOp;
 use deno::ErrBox;
 use deno::Loader;
 use deno::ModuleSpecifier;
+use deno::OpId;
 use deno::PinnedBuf;
 use futures::future::Shared;
 use futures::Future;
@@ -104,10 +105,11 @@ impl Deref for ThreadSafeState {
 impl ThreadSafeState {
   pub fn dispatch(
     &self,
+    op_id: OpId,
     control: &[u8],
     zero_copy: Option<PinnedBuf>,
   ) -> CoreOp {
-    ops::dispatch_all(self, control, zero_copy, self.dispatch_selector)
+    ops::dispatch_all(self, op_id, control, zero_copy, self.dispatch_selector)
   }
 }
 

cli/worker.rs

@@ -29,8 +29,8 @@ impl Worker {
     {
       let mut i = isolate.lock().unwrap();
       let state_ = state.clone();
-      i.set_dispatch(move |control_buf, zero_copy_buf| {
-        state_.dispatch(control_buf, zero_copy_buf)
+      i.set_dispatch(move |op_id, control_buf, zero_copy_buf| {
+        state_.dispatch(op_id, control_buf, zero_copy_buf)
       });
       let state_ = state.clone();
       i.set_js_error_create(move |v8_exception| {

core/core.d.ts

@@ -5,11 +5,12 @@
 // Deno and therefore do not flow through to the runtime type library.
 
 declare interface MessageCallback {
-  (msg: Uint8Array): void;
+  (opId: number, msg: Uint8Array): void;
 }
 
 declare interface DenoCore {
   dispatch(
+    opId: number,
     control: Uint8Array,
     zeroCopy?: ArrayBufferView | null
   ): Uint8Array | null;

core/examples/http_bench.js

@@ -29,20 +29,19 @@ function createResolvable() {
   return Object.assign(promise, methods);
 }
 
-const scratch32 = new Int32Array(4);
+const scratch32 = new Int32Array(3);
 const scratchBytes = new Uint8Array(
   scratch32.buffer,
   scratch32.byteOffset,
   scratch32.byteLength
 );
-assert(scratchBytes.byteLength === 4 * 4);
+assert(scratchBytes.byteLength === 3 * 4);
 
 function send(promiseId, opId, arg, zeroCopy = null) {
   scratch32[0] = promiseId;
-  scratch32[1] = opId;
-  scratch32[2] = arg;
-  scratch32[3] = -1;
-  return Deno.core.dispatch(scratchBytes, zeroCopy);
+  scratch32[1] = arg;
+  scratch32[2] = -1;
+  return Deno.core.dispatch(opId, scratchBytes, zeroCopy);
 }
 
 /** Returns Promise<number> */
@@ -55,13 +54,12 @@ function sendAsync(opId, arg, zeroCopy = null) {
 }
 
 function recordFromBuf(buf) {
-  assert(buf.byteLength === 16);
+  assert(buf.byteLength === 3 * 4);
   const buf32 = new Int32Array(buf.buffer, buf.byteOffset, buf.byteLength / 4);
   return {
     promiseId: buf32[0],
-    opId: buf32[1],
-    arg: buf32[2],
-    result: buf32[3]
+    arg: buf32[1],
+    result: buf32[2]
   };
 }
 
@@ -72,7 +70,7 @@ function sendSync(opId, arg) {
   return record.result;
 }
 
-function handleAsyncMsgFromRust(buf) {
+function handleAsyncMsgFromRust(opId, buf) {
   const record = recordFromBuf(buf);
   const { promiseId, result } = record;
   const p = promiseMap.get(promiseId);

core/examples/http_bench.rs

@@ -36,25 +36,23 @@ impl log::Log for Logger {
   fn flush(&self) {}
 }
 
-const OP_LISTEN: i32 = 1;
-const OP_ACCEPT: i32 = 2;
-const OP_READ: i32 = 3;
-const OP_WRITE: i32 = 4;
-const OP_CLOSE: i32 = 5;
+const OP_LISTEN: OpId = 1;
+const OP_ACCEPT: OpId = 2;
+const OP_READ: OpId = 3;
+const OP_WRITE: OpId = 4;
+const OP_CLOSE: OpId = 5;
 
 #[derive(Clone, Debug, PartialEq)]
 pub struct Record {
   pub promise_id: i32,
-  pub op_id: i32,
   pub arg: i32,
   pub result: i32,
 }
 
 impl Into<Buf> for Record {
   fn into(self) -> Buf {
-    let buf32 = vec![self.promise_id, self.op_id, self.arg, self.result]
-      .into_boxed_slice();
-    let ptr = Box::into_raw(buf32) as *mut [u8; 16];
+    let buf32 = vec![self.promise_id, self.arg, self.result].into_boxed_slice();
+    let ptr = Box::into_raw(buf32) as *mut [u8; 3 * 4];
     unsafe { Box::from_raw(ptr) }
   }
 }
@@ -63,28 +61,26 @@ impl From<&[u8]> for Record {
   fn from(s: &[u8]) -> Record {
     #[allow(clippy::cast_ptr_alignment)]
     let ptr = s.as_ptr() as *const i32;
-    let ints = unsafe { std::slice::from_raw_parts(ptr, 4) };
+    let ints = unsafe { std::slice::from_raw_parts(ptr, 3) };
     Record {
       promise_id: ints[0],
-      op_id: ints[1],
-      arg: ints[2],
-      result: ints[3],
+      arg: ints[1],
+      result: ints[2],
     }
   }
 }
 
 impl From<Buf> for Record {
   fn from(buf: Buf) -> Record {
-    assert_eq!(buf.len(), 4 * 4);
+    assert_eq!(buf.len(), 3 * 4);
     #[allow(clippy::cast_ptr_alignment)]
-    let ptr = Box::into_raw(buf) as *mut [i32; 4];
+    let ptr = Box::into_raw(buf) as *mut [i32; 3];
     let ints: Box<[i32]> = unsafe { Box::from_raw(ptr) };
-    assert_eq!(ints.len(), 4);
+    assert_eq!(ints.len(), 3);
     Record {
       promise_id: ints[0],
-      op_id: ints[1],
-      arg: ints[2],
-      result: ints[3],
+      arg: ints[1],
+      result: ints[2],
     }
   }
 }
@@ -93,7 +89,6 @@ impl From<Buf> for Record {
 fn test_record_from() {
   let r = Record {
     promise_id: 1,
-    op_id: 2,
     arg: 3,
     result: 4,
   };
@@ -102,7 +97,7 @@ fn test_record_from() {
   #[cfg(target_endian = "little")]
   assert_eq!(
     buf,
-    vec![1u8, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0].into_boxed_slice()
+    vec![1u8, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0].into_boxed_slice()
   );
   let actual = Record::from(buf);
   assert_eq!(actual, expected);
@@ -111,10 +106,14 @@ fn test_record_from() {
 
 pub type HttpBenchOp = dyn Future<Item = i32, Error = std::io::Error> + Send;
 
-fn dispatch(control: &[u8], zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
+fn dispatch(
+  op_id: OpId,
+  control: &[u8],
+  zero_copy_buf: Option<PinnedBuf>,
+) -> CoreOp {
   let record = Record::from(control);
   let is_sync = record.promise_id == 0;
-  let http_bench_op = match record.op_id {
+  let http_bench_op = match op_id {
     OP_LISTEN => {
       assert!(is_sync);
       op_listen()
@@ -139,7 +138,7 @@ fn dispatch(control: &[u8], zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
       let rid = record.arg;
       op_write(rid, zero_copy_buf)
     }
-    _ => panic!("bad op {}", record.op_id),
+    _ => panic!("bad op {}", op_id),
   };
   let mut record_a = record.clone();
   let mut record_b = record.clone();
@@ -162,7 +161,8 @@ fn dispatch(control: &[u8], zero_copy_buf: Option<PinnedBuf>) -> CoreOp {
   );
 
   if is_sync {
-    Op::Sync(fut.wait().unwrap())
+    let buf = fut.wait().unwrap();
+    Op::Sync(buf)
   } else {
     Op::Async(fut)
   }