async_hooks: merge resource_symbol with owner_symbol

Signed-off-by: Darshan Sen <darshan.sen@postman.com>

PR-URL: #38468
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

lib/_http_agent.js

@@ -525,7 +525,7 @@ function asyncResetHandle(socket) {
   const handle = socket._handle;
   if (handle && typeof handle.asyncReset === 'function') {
     // Assign the handle a new asyncId and run any destroy()/init() hooks.
-    handle.asyncReset(new ReusedHandle(handle.getProviderType(), handle));
+    handle.asyncReset(new ReusedHandle(handle.getProviderType(), socket));
     socket[async_id_symbol] = handle.getAsyncId();
   }
 }

lib/internal/async_hooks.js

@@ -81,7 +81,7 @@ const active_hooks = {
 
 const { registerDestroyHook } = async_wrap;
 const { enqueueMicrotask } = internalBinding('task_queue');
-const { resource_symbol, owner_symbol } = internalBinding('symbols');
+const { owner_symbol } = internalBinding('symbols');
 
 // Each constant tracks how many callbacks there are for any given step of
 // async execution. These are tracked so if the user didn't include callbacks
@@ -178,11 +178,13 @@ function fatalError(e) {
 
 function lookupPublicResource(resource) {
   if (typeof resource !== 'object' || resource === null) return resource;
-  // TODO(addaleax): Merge this with owner_symbol and use it across all
-  // AsyncWrap instances.
-  const publicResource = resource[resource_symbol];
-  if (publicResource !== undefined)
+
+  const publicResource = resource[owner_symbol];
+
+  if (publicResource != null) {
     return publicResource;
+  }
+
   return resource;
 }
 

lib/internal/js_stream_socket.js

@@ -22,15 +22,55 @@ const kCurrentWriteRequest = Symbol('kCurrentWriteRequest');
 const kCurrentShutdownRequest = Symbol('kCurrentShutdownRequest');
 const kPendingShutdownRequest = Symbol('kPendingShutdownRequest');
 
-function isClosing() { return this[owner_symbol].isClosing(); }
+function isClosing() {
+  let socket = this[owner_symbol];
 
-function onreadstart() { return this[owner_symbol].readStart(); }
+  if (socket.constructor.name === 'ReusedHandle') {
+    socket = socket.handle;
+  }
+
+  return socket.isClosing();
+}
+
+function onreadstart() {
+  let socket = this[owner_symbol];
+
+  if (socket.constructor.name === 'ReusedHandle') {
+    socket = socket.handle;
+  }
+
+  return socket.readStart();
+}
+
+function onreadstop() {
+  let socket = this[owner_symbol];
+
+  if (socket.constructor.name === 'ReusedHandle') {
+    socket = socket.handle;
+  }
+
+  return socket.readStop();
+}
+
+function onshutdown(req) {
+  let socket = this[owner_symbol];
+
+  if (socket.constructor.name === 'ReusedHandle') {
+    socket = socket.handle;
+  }
 
-function onreadstop() { return this[owner_symbol].readStop(); }
+  return socket.doShutdown(req);
+}
 
-function onshutdown(req) { return this[owner_symbol].doShutdown(req); }
+function onwrite(req, bufs) {
+  let socket = this[owner_symbol];
 
-function onwrite(req, bufs) { return this[owner_symbol].doWrite(req, bufs); }
+  if (socket.constructor.name === 'ReusedHandle') {
+    socket = socket.handle;
+  }
+
+  return socket.doWrite(req, bufs);
+}
 
 /* This class serves as a wrapper for when the C++ side of Node wants access
  * to a standard JS stream. For example, TLS or HTTP do not operate on network

lib/internal/stream_base_commons.js

@@ -80,7 +80,11 @@ function handleWriteReq(req, data, encoding) {
 function onWriteComplete(status) {
   debug('onWriteComplete', status, this.error);
 
-  const stream = this.handle[owner_symbol];
+  let stream = this.handle[owner_symbol];
+
+  if (stream.constructor.name === 'ReusedHandle') {
+    stream = stream.handle;
+  }
 
   if (stream.destroyed) {
     if (typeof this.callback === 'function')
@@ -168,7 +172,12 @@ function onStreamRead(arrayBuffer) {
   const nread = streamBaseState[kReadBytesOrError];
 
   const handle = this;
-  const stream = this[owner_symbol];
+
+  let stream = this[owner_symbol];
+
+  if (stream.constructor.name === 'ReusedHandle') {
+    stream = stream.handle;
+  }
 
   stream[kUpdateTimer]();
 

lib/net.js

@@ -1102,7 +1102,11 @@ Socket.prototype.unref = function() {
 
 
 function afterConnect(status, handle, req, readable, writable) {
-  const self = handle[owner_symbol];
+  let self = handle[owner_symbol];
+
+  if (self.constructor.name === 'ReusedHandle') {
+    self = self.handle;
+  }
 
   // Callback may come after call to destroy
   if (self.destroyed) {

src/async_wrap.cc

@@ -313,7 +313,7 @@ void AsyncWrap::EmitDestroy(bool from_gc) {
 
   if (!persistent().IsEmpty() && !from_gc) {
     HandleScope handle_scope(env()->isolate());
-    USE(object()->Set(env()->context(), env()->resource_symbol(), object()));
+    USE(object()->Set(env()->context(), env()->owner_symbol(), object()));
   }
 }
 
@@ -586,7 +586,7 @@ void AsyncWrap::AsyncReset(Local<Object> resource, double execution_async_id,
     Local<Object> obj = object();
     CHECK(!obj.IsEmpty());
     if (resource != obj) {
-      USE(obj->Set(env()->context(), env()->resource_symbol(), resource));
+      USE(obj->Set(env()->context(), env()->owner_symbol(), resource));
     }
   }
 

src/env.h

@@ -170,7 +170,6 @@ constexpr size_t kFsStatsBufferLength =
   V(oninit_symbol, "oninit")                                                   \
   V(owner_symbol, "owner_symbol")                                              \
   V(onpskexchange_symbol, "onpskexchange")                                     \
-  V(resource_symbol, "resource_symbol")                                        \
   V(trigger_async_id_symbol, "trigger_async_id_symbol")                        \
 
 // Strings are per-isolate primitives but Environment proxies them

test/async-hooks/test-http-agent-handle-reuse-parallel.js

@@ -87,6 +87,4 @@ function onExit() {
   // Verify reuse handle has been wrapped
   assert.strictEqual(first.type, second.type);
   assert.ok(first.handle !== second.handle, 'Resource reused');
-  assert.ok(first.handle === second.handle.handle,
-            'Resource not wrapped correctly');
 }

test/async-hooks/test-http-agent-handle-reuse-serial.js

@@ -105,6 +105,4 @@ function onExit() {
   // Verify reuse handle has been wrapped
   assert.strictEqual(first.type, second.type);
   assert.ok(first.handle !== second.handle, 'Resource reused');
-  assert.ok(first.handle === second.handle.handle,
-            'Resource not wrapped correctly');
 }