WebSocket and PyWorker fixes (#2366)

* WebSocket and PyWorker fixes

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

core/src/stdlib/pyscript/magic_js.py

@@ -67,7 +67,11 @@ if RUNNING_IN_WORKER:
 
 else:
     import _pyscript
-    from _pyscript import PyWorker, js_import
+    from _pyscript import PyWorker as _PyWorker, js_import
+    from pyscript.ffi import to_js
+
+    def PyWorker(url, **kw):
+        return _PyWorker(url, to_js(kw))
 
     window = globalThis
     document = globalThis.document

core/src/stdlib/pyscript/websocket.py

@@ -1,6 +1,6 @@
 import js
 from pyscript.ffi import create_proxy
-from pyscript.util import as_bytearray
+from pyscript.util import as_bytearray, is_awaitable
 
 code = "code"
 protocols = "protocols"
@@ -8,6 +8,23 @@ reason = "reason"
 methods = ["onclose", "onerror", "onmessage", "onopen"]
 
 
+def add_listener(socket, onevent, listener):
+    p = create_proxy(listener)
+
+    if is_awaitable(listener):
+
+        async def wrapper(e):
+            await p(EventMessage(e))
+
+        m = wrapper
+
+    else:
+        m = lambda e: p(EventMessage(e))
+
+    # Pyodide fails at setting socket[onevent] directly
+    setattr(socket, onevent, m)
+
+
 class EventMessage:
     def __init__(self, event):
         self._event = event
@@ -36,20 +53,20 @@ class WebSocket:
             socket = js.WebSocket.new(url, kw[protocols])
         else:
             socket = js.WebSocket.new(url)
+
+        socket.binaryType = "arraybuffer"
         object.__setattr__(self, "_ws", socket)
 
         for t in methods:
             if t in kw:
-                # Pyodide fails at setting socket[t] directly
-                setattr(socket, t, create_proxy(kw[t]))
+                add_listener(socket, t, kw[t])
 
     def __getattr__(self, attr):
         return getattr(self._ws, attr)
 
     def __setattr__(self, attr, value):
         if attr in methods:
-            m = lambda e: value(EventMessage(e))
-            setattr(self._ws, attr, create_proxy(m))
+            add_listener(self._ws, attr, value)
         else:
             setattr(self._ws, attr, value)
 

core/tests/javascript/ws/index.html

@@ -14,7 +14,7 @@
         print(event.type)
         ws.send("hello")
 
-    def onmessage(event):
+    async def onmessage(event):
         print(event.type, event.data)
         ws.close()