perf(ext/websocket): optimize socket.send (#16320)

Towards #16315

ext/websocket/01_websocket.js

@@ -18,20 +18,20 @@
     ArrayPrototypeJoin,
     ArrayPrototypeMap,
     ArrayPrototypeSome,
-    DataView,
     ErrorPrototypeToString,
     ObjectDefineProperties,
     ObjectPrototypeIsPrototypeOf,
     PromisePrototypeThen,
     RegExpPrototypeTest,
     Set,
-    String,
     StringPrototypeEndsWith,
     StringPrototypeToLowerCase,
     Symbol,
     SymbolIterator,
     PromisePrototypeCatch,
+    queueMicrotask,
     SymbolFor,
+    Uint8Array,
   } = window.__bootstrap.primordials;
 
   webidl.converters["sequence<DOMString> or DOMString"] = (V, opts) => {
@@ -290,40 +290,58 @@
         throw new DOMException("readyState not OPEN", "InvalidStateError");
       }
 
+      if (typeof data === "string") {
+        // try to send in one go!
+        const d = core.byteLength(data);
+        const sent = ops.op_ws_try_send_string(this[_rid], data);
+        this[_bufferedAmount] += d;
+        if (!sent) {
+          PromisePrototypeThen(
+            core.opAsync("op_ws_send_string", this[_rid], data),
+            () => {
+              this[_bufferedAmount] -= d;
+            },
+          );
+        } else {
+          // Spec expects data to be start flushing on next tick but oh well...
+          // we already sent it so we can just decrement the bufferedAmount
+          // on the next tick.
+          queueMicrotask(() => {
+            this[_bufferedAmount] -= d;
+          });
+        }
+        return;
+      }
+
       const sendTypedArray = (ta) => {
+        // try to send in one go!
+        const sent = ops.op_ws_try_send_binary(this[_rid], ta);
         this[_bufferedAmount] += ta.byteLength;
-        PromisePrototypeThen(
-          core.opAsync("op_ws_send", this[_rid], {
-            kind: "binary",
-            value: ta,
-          }),
-          () => {
+        if (!sent) {
+          PromisePrototypeThen(
+            core.opAsync("op_ws_send_binary", this[_rid], ta),
+            () => {
+              this[_bufferedAmount] -= ta.byteLength;
+            },
+          );
+        } else {
+          // Spec expects data to be start flushing on next tick but oh well...
+          // we already sent it so we can just decrement the bufferedAmount
+          // on the next tick.
+          queueMicrotask(() => {
             this[_bufferedAmount] -= ta.byteLength;
-          },
-        );
+          });
+        }
       };
 
-      if (ObjectPrototypeIsPrototypeOf(BlobPrototype, data)) {
-        PromisePrototypeThen(
-          data.slice().arrayBuffer(),
-          (ab) => sendTypedArray(new DataView(ab)),
-        );
+      if (ObjectPrototypeIsPrototypeOf(ArrayBufferPrototype, data)) {
+        sendTypedArray(new Uint8Array(data));
       } else if (ArrayBufferIsView(data)) {
         sendTypedArray(data);
-      } else if (ObjectPrototypeIsPrototypeOf(ArrayBufferPrototype, data)) {
-        sendTypedArray(new DataView(data));
-      } else {
-        const string = String(data);
-        const d = core.encode(string);
-        this[_bufferedAmount] += d.byteLength;
+      } else if (ObjectPrototypeIsPrototypeOf(BlobPrototype, data)) {
         PromisePrototypeThen(
-          core.opAsync("op_ws_send", this[_rid], {
-            kind: "text",
-            value: string,
-          }),
-          () => {
-            this[_bufferedAmount] -= d.byteLength;
-          },
+          data.slice().arrayBuffer(),
+          (ab) => sendTypedArray(new Uint8Array(ab)),
         );
       }
     }

ext/websocket/lib.rs

@@ -161,6 +161,51 @@ impl WsStreamResource {
     }
   }
 
+  fn try_send(self: &Rc<Self>, message: Message) -> Result<bool, AnyError> {
+    let waker = deno_core::futures::task::noop_waker();
+    let mut cx = std::task::Context::from_waker(&waker);
+
+    let res = match self.stream {
+      WebSocketStreamType::Client { .. } => {
+        match RcRef::map(self, |r| match &r.stream {
+          WebSocketStreamType::Client { tx, .. } => tx,
+          WebSocketStreamType::Server { .. } => unreachable!(),
+        })
+        .try_borrow_mut()
+        {
+          Some(mut tx) => {
+            if tx.poll_ready_unpin(&mut cx).is_ready() {
+              tx.start_send_unpin(message)?;
+              tx.poll_flush_unpin(&mut cx).is_ready()
+            } else {
+              false
+            }
+          }
+          None => false,
+        }
+      }
+      WebSocketStreamType::Server { .. } => {
+        match RcRef::map(self, |r| match &r.stream {
+          WebSocketStreamType::Client { .. } => unreachable!(),
+          WebSocketStreamType::Server { tx, .. } => tx,
+        })
+        .try_borrow_mut()
+        {
+          Some(mut tx) => {
+            if tx.poll_ready_unpin(&mut cx).is_ready() {
+              tx.start_send_unpin(message)?;
+              tx.poll_flush_unpin(&mut cx).is_ready()
+            } else {
+              false
+            }
+          }
+          None => false,
+        }
+      }
+    };
+    Ok(res)
+  }
+
   async fn next_message(
     self: &Rc<Self>,
     cancel: RcRef<CancelHandle>,
@@ -426,6 +471,54 @@ pub async fn op_ws_send(
   Ok(())
 }
 
+#[op]
+pub async fn op_ws_send_string(
+  state: Rc<RefCell<OpState>>,
+  rid: ResourceId,
+  text: String,
+) -> Result<(), AnyError> {
+  let resource = state
+    .borrow_mut()
+    .resource_table
+    .get::<WsStreamResource>(rid)?;
+  resource.send(Message::Text(text)).await?;
+  Ok(())
+}
+
+#[op]
+pub async fn op_ws_send_binary(
+  state: Rc<RefCell<OpState>>,
+  rid: ResourceId,
+  data: ZeroCopyBuf,
+) -> Result<(), AnyError> {
+  let resource = state
+    .borrow_mut()
+    .resource_table
+    .get::<WsStreamResource>(rid)?;
+  resource.send(Message::Binary(data.to_vec())).await?;
+  Ok(())
+}
+
+#[op]
+pub fn op_ws_try_send_string(
+  state: &mut OpState,
+  rid: ResourceId,
+  text: String,
+) -> Result<bool, AnyError> {
+  let resource = state.resource_table.get::<WsStreamResource>(rid)?;
+  resource.try_send(Message::Text(text))
+}
+
+#[op(fast)]
+pub fn op_ws_try_send_binary(
+  state: &mut OpState,
+  rid: u32,
+  value: &[u8],
+) -> Result<bool, AnyError> {
+  let resource = state.resource_table.get::<WsStreamResource>(rid)?;
+  resource.try_send(Message::Binary(value.to_vec()))
+}
+
 #[op(deferred)]
 pub async fn op_ws_close(
   state: Rc<RefCell<OpState>>,
@@ -515,6 +608,10 @@ pub fn init<P: WebSocketPermissions + 'static>(
       op_ws_send::decl(),
       op_ws_close::decl(),
       op_ws_next_event::decl(),
+      op_ws_send_string::decl(),
+      op_ws_send_binary::decl(),
+      op_ws_try_send_string::decl(),
+      op_ws_try_send_binary::decl(),
     ])
     .state(move |state| {
       state.put::<WsUserAgent>(WsUserAgent(user_agent.clone()));