feat: support individual async handler for each op (#3690)

cli/js/dispatch.ts

@@ -85,57 +85,12 @@ export function setPluginAsyncHandler(
   PLUGIN_ASYNC_HANDLER_MAP.set(opId, handler);
 }
 
-export function asyncMsgFromRust(opId: number, ui8: Uint8Array): void {
-  switch (opId) {
-    case OP_WRITE:
-    case OP_READ:
-      minimal.asyncMsgFromRust(opId, ui8);
-      break;
-    case OP_GET_DIR:
-    case OP_EXIT:
-    case OP_IS_TTY:
-    case OP_ENV:
-    case OP_EXEC_PATH:
-    case OP_UTIME:
-    case OP_OPEN:
-    case OP_SEEK:
-    case OP_FETCH:
-    case OP_REPL_START:
-    case OP_REPL_READLINE:
-    case OP_ACCEPT:
-    case OP_ACCEPT_TLS:
-    case OP_DIAL:
-    case OP_GLOBAL_TIMER:
-    case OP_HOST_GET_WORKER_CLOSED:
-    case OP_HOST_GET_MESSAGE:
-    case OP_WORKER_GET_MESSAGE:
-    case OP_RUN_STATUS:
-    case OP_MKDIR:
-    case OP_CHMOD:
-    case OP_CHOWN:
-    case OP_REMOVE:
-    case OP_COPY_FILE:
-    case OP_STAT:
-    case OP_REALPATH:
-    case OP_READ_DIR:
-    case OP_RENAME:
-    case OP_LINK:
-    case OP_SYMLINK:
-    case OP_READ_LINK:
-    case OP_TRUNCATE:
-    case OP_MAKE_TEMP_DIR:
-    case OP_DIAL_TLS:
-    case OP_FETCH_SOURCE_FILES:
-    case OP_COMPILE:
-    case OP_TRANSPILE:
-      json.asyncMsgFromRust(opId, ui8);
-      break;
+export function getAsyncHandler(opName: string): (msg: Uint8Array) => void {
+  switch (opName) {
+    case "OP_WRITE":
+    case "OP_READ":
+      return minimal.asyncMsgFromRust;
     default:
-      const handler = PLUGIN_ASYNC_HANDLER_MAP.get(opId);
-      if (handler) {
-        handler(ui8);
-      } else {
-        throw Error("bad async opId");
-      }
+      return json.asyncMsgFromRust;
   }
 }

cli/js/dispatch_json.ts

@@ -43,7 +43,7 @@ function unwrapResponse(res: JsonResponse): Ok {
   return res.ok;
 }
 
-export function asyncMsgFromRust(opId: number, resUi8: Uint8Array): void {
+export function asyncMsgFromRust(resUi8: Uint8Array): void {
   const res = decode(resUi8);
   util.assert(res.promiseId != null);
 

cli/js/dispatch_minimal.ts

@@ -18,7 +18,6 @@ function nextPromiseId(): number {
 
 export interface RecordMinimal {
   promiseId: number;
-  opId: number; // Maybe better called dispatchId
   arg: number;
   result: number;
   err?: {
@@ -27,10 +26,7 @@ export interface RecordMinimal {
   };
 }
 
-export function recordFromBufMinimal(
-  opId: number,
-  ui8: Uint8Array
-): RecordMinimal {
+export function recordFromBufMinimal(ui8: Uint8Array): RecordMinimal {
   const header = ui8.slice(0, 12);
   const buf32 = new Int32Array(
     header.buffer,
@@ -52,7 +48,6 @@ export function recordFromBufMinimal(
 
   return {
     promiseId,
-    opId,
     arg,
     result,
     err
@@ -74,8 +69,8 @@ const scratchBytes = new Uint8Array(
 );
 util.assert(scratchBytes.byteLength === scratch32.length * 4);
 
-export function asyncMsgFromRust(opId: number, ui8: Uint8Array): void {
-  const record = recordFromBufMinimal(opId, ui8);
+export function asyncMsgFromRust(ui8: Uint8Array): void {
+  const record = recordFromBufMinimal(ui8);
   const { promiseId } = record;
   const promise = promiseTableMin.get(promiseId);
   promiseTableMin.delete(promiseId);
@@ -95,7 +90,7 @@ export async function sendAsyncMinimal(
   const promise = util.createResolvable<RecordMinimal>();
   const buf = core.dispatch(opId, scratchBytes, zeroCopy);
   if (buf) {
-    const record = recordFromBufMinimal(opId, buf);
+    const record = recordFromBufMinimal(buf);
     // Sync result.
     promise.resolve(record);
   } else {
@@ -115,6 +110,6 @@ export function sendSyncMinimal(
   scratch32[0] = 0; // promiseId 0 indicates sync
   scratch32[1] = arg;
   const res = core.dispatch(opId, scratchBytes, zeroCopy)!;
-  const resRecord = recordFromBufMinimal(opId, res);
+  const resRecord = recordFromBufMinimal(res);
   return unwrapResponse(resRecord);
 }

cli/js/os.ts

@@ -89,7 +89,6 @@ interface Start {
 // the runtime and the compiler environments.
 // @internal
 export function start(preserveDenoNamespace = true, source?: string): Start {
-  core.setAsyncHandler(dispatch.asyncMsgFromRust);
   const ops = core.ops();
   // TODO(bartlomieju): this is a prototype, we should come up with
   // something a bit more sophisticated
@@ -98,6 +97,7 @@ export function start(preserveDenoNamespace = true, source?: string): Start {
     // Assign op ids to actual variables
     // TODO(ry) This type casting is gross and should be fixed.
     ((dispatch as unknown) as { [key: string]: number })[opName] = opId;
+    core.setAsyncHandler(opId, dispatch.getAsyncHandler(opName));
   }
   // First we send an empty `Start` message to let the privileged side know we
   // are ready. The response should be a `StartRes` message containing the CLI

cli/js/plugins.ts

@@ -1,5 +1,5 @@
 import { sendSync } from "./dispatch_json.ts";
-import { OP_OPEN_PLUGIN, setPluginAsyncHandler } from "./dispatch.ts";
+import { OP_OPEN_PLUGIN } from "./dispatch.ts";
 import { core } from "./core.ts";
 
 export interface AsyncHandler {
@@ -25,7 +25,7 @@ class PluginOpImpl implements PluginOp {
   }
 
   setAsyncHandler(handler: AsyncHandler): void {
-    setPluginAsyncHandler(this.opId, handler);
+    core.setAsyncHandler(this.opId, handler);
   }
 }