Detect Pyodide to avoid get_asyncgen_hooks (#179)

Author: almarklein

rendercanvas/_coreutils.py

@@ -19,6 +19,7 @@
 
 
 IS_WIN = sys.platform.startswith("win")  # Note that IS_WIN is false on Pyodide
+IS_PYODIDE = sys.platform == "emscripten"
 
 
 # %% Logging

rendercanvas/utils/asyncs.py

@@ -12,7 +12,7 @@
 
 import sys
 
-from .._coreutils import IS_WIN, call_later_from_thread
+from .._coreutils import IS_WIN, IS_PYODIDE, call_later_from_thread
 
 
 USE_THREADED_TIMER = IS_WIN
@@ -24,6 +24,10 @@
 
 def detect_current_async_lib():
     """Get the lib name of the currently active async lib, or None."""
+
+    if IS_PYODIDE:
+        return "asyncio"
+
     ob = sys.get_asyncgen_hooks()[0]
     if ob is not None:
         try:
@@ -40,6 +44,10 @@ def detect_current_async_lib():
 def detect_current_call_soon_threadsafe():
     """Get the current applicable call_soon_threadsafe function, or None"""
 
+    # We could support Pyodide too, but this never gets called on Pyodide anyway (bc USE_THREADED_TIMER). Leaving commented for reference.
+    # if IS_PYODIDE:
+    #     return sys.modules["asyncio"].get_running_loop().call_soon_threadsafe
+
     # Get asyncgen hook func, return fast when no async loop active
     ob = sys.get_asyncgen_hooks()[0]
     if ob is None:

tests/test_glfw.py

@@ -147,8 +147,8 @@ def _test_scheduling_continuous(canvas):
 
     # And a second one after 0.1s, with 10 fps.
     canvas.active_sleep(0.1)
-    assert canvas.draw_count == 2
-    assert canvas.events_count == 2
+    assert canvas.draw_count in (2, 3)
+    assert canvas.events_count in (2, 3)
 
     # And after one second, about 10 more
     canvas.draw_count = canvas.events_count = 0