Improvements for pyodide handling (#3444)

* Improvements for pyodide handling

* Fix flakes

panel/io/__init__.py

@@ -17,7 +17,7 @@
     load_notebook, push, push_notebook
 )
 
-if '_pyodide' in sys.modules:
+if state._is_pyodide:
     from .pyodide import serve
 else:
     from .server import serve # noqa

panel/io/callbacks.py

@@ -6,7 +6,6 @@
 import inspect
 import logging
 import time
-import sys
 
 import param
 
@@ -165,7 +164,7 @@ def start(self):
             finally:
                 self._updating = False
         self._start_time = time.time()
-        if '_pyodide' in sys.modules:
+        if state._is_pyodide:
             event_loop = asyncio.get_running_loop()
             task = asyncio.create_task(
                 self._async_repeat(self._periodic_callback)
@@ -195,7 +194,7 @@ def stop(self):
                 self._updating = False
         self._counter = 0
         self._timeout = None
-        if '_pyodide' in sys.modules:
+        if state._is_pyodide:
             self._cb.cancel()
         elif self._doc:
             if self._doc._session_context:

panel/io/pyodide.py

@@ -9,7 +9,7 @@
 
 from bokeh import __version__
 from bokeh.document import Document
-from bokeh.embed.util import standalone_docs_json
+from bokeh.embed.util import standalone_docs_json_and_render_items
 from bokeh.protocol.messages.patch_doc import process_document_events
 
 from . import resources
@@ -40,7 +40,9 @@ def _doc_json(model, target):
     doc = Document()
     model.server_doc(doc=doc)
     model = doc.roots[0]
-    docs_json = standalone_docs_json([model])
+    docs_json, _ = standalone_docs_json_and_render_items(
+        [model], suppress_callback_warning=True
+    )
 
     doc_json = list(docs_json.values())[0]
     root_id = doc_json['roots']['root_ids'][0]

panel/io/state.py

@@ -147,12 +147,16 @@ def __repr__(self):
 
     @property
     def _ioloop(self):
-        if 'pyodide' in sys.modules:
+        if state._is_pyodide:
             return asyncio.get_running_loop()
         else:
             from tornado.ioloop import IOLoop
             return IOLoop.current()
 
+    @property
+    def _is_pyodide(self):
+        return '_pyodide' in sys.modules
+
     @property
     def _thread_id(self):
         return self._thread_id_.get(self.curdoc) if self.curdoc else None