Refactor dispatcher system

cli/ops/dispatch_minimal.rs

@@ -4,7 +4,6 @@
 //! alternative to flatbuffers using a very simple list of int32s to lay out
 //! messages. The first i32 is used to determine if a message a flatbuffer
 //! message or a "minimal" message.
-use crate::state::ThreadSafeState;
 use deno::Buf;
 use deno::CoreOp;
 use deno::ErrBox;
@@ -13,7 +12,6 @@ use deno::PinnedBuf;
 use futures::Future;
 
 pub type MinimalOp = dyn Future<Item = i32, Error = ErrBox> + Send;
-pub type Dispatcher = fn(i32, Option<PinnedBuf>) -> Box<MinimalOp>;
 
 #[derive(Copy, Clone, Debug, PartialEq)]
 // This corresponds to RecordMinimal on the TS side.
@@ -72,12 +70,14 @@ fn test_parse_min_record() {
   assert_eq!(parse_min_record(&buf), None);
 }
 
-pub fn dispatch(
-  d: Dispatcher,
-  _state: &ThreadSafeState,
+pub fn wrap_minimal_op<D>(
+  d: D,
   control: &[u8],
   zero_copy: Option<PinnedBuf>,
-) -> CoreOp {
+) -> CoreOp
+where
+  D: FnOnce(i32, Option<PinnedBuf>) -> Box<MinimalOp>,
+{
   let mut record = parse_min_record(control).unwrap();
   let is_sync = record.promise_id == 0;
   let rid = record.arg;

cli/ops/io.rs

@@ -1,43 +1,84 @@
-use super::dispatch_minimal::MinimalOp;
+use super::dispatch_minimal::wrap_minimal_op;
 use crate::deno_error;
 use crate::resources;
+use crate::state::DenoOpDispatcher;
+use crate::state::ThreadSafeState;
 use crate::tokio_write;
+use deno::CoreOp;
 use deno::ErrBox;
 use deno::PinnedBuf;
 use futures::Future;
 
-pub fn op_read(rid: i32, zero_copy: Option<PinnedBuf>) -> Box<MinimalOp> {
-  debug!("read rid={}", rid);
-  let zero_copy = match zero_copy {
-    None => {
-      return Box::new(futures::future::err(deno_error::no_buffer_specified()))
-    }
-    Some(buf) => buf,
-  };
-  match resources::lookup(rid as u32) {
-    None => Box::new(futures::future::err(deno_error::bad_resource())),
-    Some(resource) => Box::new(
-      tokio::io::read(resource, zero_copy)
-        .map_err(ErrBox::from)
-        .and_then(move |(_resource, _buf, nread)| Ok(nread as i32)),
-    ),
+pub struct OpRead;
+
+impl DenoOpDispatcher for OpRead {
+  fn dispatch(
+    &self,
+    _state: &ThreadSafeState,
+    control: &[u8],
+    buf: Option<PinnedBuf>,
+  ) -> CoreOp {
+    wrap_minimal_op(
+      move |rid, zero_copy| {
+        debug!("read rid={}", rid);
+        let zero_copy = match zero_copy {
+          None => {
+            return Box::new(futures::future::err(
+              deno_error::no_buffer_specified(),
+            ))
+          }
+          Some(buf) => buf,
+        };
+        match resources::lookup(rid as u32) {
+          None => Box::new(futures::future::err(deno_error::bad_resource())),
+          Some(resource) => Box::new(
+            tokio::io::read(resource, zero_copy)
+              .map_err(ErrBox::from)
+              .and_then(move |(_resource, _buf, nread)| Ok(nread as i32)),
+          ),
+        }
+      },
+      control,
+      buf,
+    )
   }
+
+  const NAME: &'static str = "read";
 }
 
-pub fn op_write(rid: i32, zero_copy: Option<PinnedBuf>) -> Box<MinimalOp> {
-  debug!("write rid={}", rid);
-  let zero_copy = match zero_copy {
-    None => {
-      return Box::new(futures::future::err(deno_error::no_buffer_specified()))
-    }
-    Some(buf) => buf,
-  };
-  match resources::lookup(rid as u32) {
-    None => Box::new(futures::future::err(deno_error::bad_resource())),
-    Some(resource) => Box::new(
-      tokio_write::write(resource, zero_copy)
-        .map_err(ErrBox::from)
-        .and_then(move |(_resource, _buf, nwritten)| Ok(nwritten as i32)),
-    ),
+pub struct OpWrite;
+
+impl DenoOpDispatcher for OpWrite {
+  fn dispatch(
+    &self,
+    _state: &ThreadSafeState,
+    control: &[u8],
+    buf: Option<PinnedBuf>,
+  ) -> CoreOp {
+    wrap_minimal_op(
+      move |rid, zero_copy| {
+        debug!("write rid={}", rid);
+        let zero_copy = match zero_copy {
+          None => {
+            return Box::new(futures::future::err(
+              deno_error::no_buffer_specified(),
+            ))
+          }
+          Some(buf) => buf,
+        };
+        match resources::lookup(rid as u32) {
+          None => Box::new(futures::future::err(deno_error::bad_resource())),
+          Some(resource) => Box::new(
+            tokio_write::write(resource, zero_copy)
+              .map_err(ErrBox::from)
+              .and_then(move |(_resource, _buf, nwritten)| Ok(nwritten as i32)),
+          ),
+        }
+      },
+      control,
+      buf,
+    )
   }
+
+  const NAME: &'static str = "write";
 }