core: add Deno.core.dispatchByName (#6395)

This commit adds alternate dispatch method to core JS API.

"Deno.core.dispatchByName()" works like "Deno.core.dispatch()", 
but takes op name instead of op id as a first argument.

1 files changed, 8 insertions, 1 deletions

diff --git a/core/core.js b/core/core.js
index 23cc325ab..b3c0ddc13 100644
--- a/core/core.js
+++ b/core/core.js
@@ -37,6 +37,7 @@ SharedQueue Binary Layout
   let asyncHandlers;
 
   let initialized = false;
+  let opsCache = {};
 
   function maybeInit() {
     if (!initialized) {
@@ -61,7 +62,8 @@ SharedQueue Binary Layout
     // op id 0 is a special value to retrieve the map of registered ops.
     const opsMapBytes = send(0, new Uint8Array([]));
     const opsMapJson = String.fromCharCode.apply(null, opsMapBytes);
-    return JSON.parse(opsMapJson);
+    opsCache = JSON.parse(opsMapJson);
+    return { ...opsCache };
   }
 
   function assert(cond) {
@@ -181,9 +183,14 @@ SharedQueue Binary Layout
     }
   }
 
+  function dispatch(opName, control, ...zeroCopy) {
+    return send(opsCache[opName], control, ...zeroCopy);
+  }
+
   Object.assign(window.Deno.core, {
     setAsyncHandler,
     dispatch: send,
+    dispatchByName: dispatch,
     ops,
     // sharedQueue is private but exposed for testing.
     sharedQueue: {