refactor dispatch take 2 (denoland#2533)

cli/dispatch_minimal.rs

@@ -6,6 +6,7 @@
 //! message or a "minimal" message.
 use crate::state::ThreadSafeState;
 use deno::Buf;
+use deno::CoreOp;
 use deno::Op;
 use deno::PinnedBuf;
 use futures::Future;
@@ -89,7 +90,7 @@ pub fn dispatch_minimal(
   state: &ThreadSafeState,
   mut record: Record,
   zero_copy: Option<PinnedBuf>,
-) -> Op {
+) -> CoreOp {
   let is_sync = record.promise_id == 0;
   let min_op = match record.op_id {
     OP_READ => ops::read(record.arg, zero_copy),

cli/errors.rs

@@ -243,6 +243,20 @@ pub fn no_buffer_specified() -> DenoError {
   new(ErrorKind::InvalidInput, String::from("no buffer specified"))
 }
 
+pub fn no_async_support() -> DenoError {
+  new(
+    ErrorKind::NoAsyncSupport,
+    String::from("op doesn't support async calls"),
+  )
+}
+
+pub fn no_sync_support() -> DenoError {
+  new(
+    ErrorKind::NoSyncSupport,
+    String::from("op doesn't support sync calls"),
+  )
+}
+
 #[derive(Debug)]
 pub enum RustOrJsError {
   Rust(DenoError),

cli/msg.fbs

@@ -136,6 +136,8 @@ enum ErrorKind: byte {
   OpNotAvaiable,
   WorkerInitFailed,
   UnixError,
+  NoAsyncSupport,
+  NoSyncSupport,
   ImportMapError,
 }