Compatibility with Blender 3.1 / Python 3.10

Blender 3.1 will be shipped with Python 3.10, which made some backward-
incompatible changes in its asyncio module (the removal of the `loop`
parameter from various functions).

Depending on which Python version is used in Blender, the add-on now
passes (or not) the `loop` parameter, retaining backward compatibility.

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Blender Cloud changelog
 
 
+## Version 1.25 (in development)
+
+- Compatibility with Blender 3.1 (Python 3.10).
+
+
 ## Version 1.24 (2022-02-04)
 
 - Bump blender-asset-tracer version 1.8 → 1.10, for fixing a bug where files were doubly-compressed.

blender_cloud/async_loop.py

@@ -56,8 +56,11 @@ def setup_asyncio_executor():
 
     from . import pillar
 
+    # Python 3.8 deprecated the 'loop' parameter, 3.10 removed it.
+    kwargs = {"loop": loop} if sys.version_info < (3, 8) else {}
+
     # No more than this many Pillar calls should be made simultaneously
-    pillar.pillar_semaphore = asyncio.Semaphore(3, loop=loop)
+    pillar.pillar_semaphore = asyncio.Semaphore(3, **kwargs)
 
 
 def kick_async_loop(*args) -> bool:

blender_cloud/pillar.py

@@ -25,6 +25,7 @@ import logging
 from contextlib import closing, contextmanager
 import urllib.parse
 import pathlib
+import sys
 
 import requests.adapters
 import requests.packages.urllib3.util.retry
@@ -261,14 +262,17 @@ async def pillar_call(pillar_func, *args, caching=True, **kwargs):
     )
     loop = asyncio.get_event_loop()
 
+    # Python 3.8 deprecated the 'loop' parameter, 3.10 removed it.
+    kwargs = {"loop": loop} if sys.version_info < (3, 8) else {}
+
     # Use explicit calls to acquire() and release() so that we have more control over
     # how long we wait and how we handle timeouts.
     try:
-        await asyncio.wait_for(pillar_semaphore.acquire(), timeout=10, loop=loop)
+        await asyncio.wait_for(pillar_semaphore.acquire(), timeout=10, **kwargs)
     except asyncio.TimeoutError:
         log.info("Waiting for semaphore to call %s", pillar_func.__name__)
         try:
-            await asyncio.wait_for(pillar_semaphore.acquire(), timeout=50, loop=loop)
+            await asyncio.wait_for(pillar_semaphore.acquire(), timeout=50, **kwargs)
         except asyncio.TimeoutError:
             raise RuntimeError("Timeout waiting for Pillar Semaphore!")
 
@@ -648,9 +652,11 @@ async def fetch_texture_thumbs(
         for texture_node in texture_nodes
     )
 
+    # Python 3.8 deprecated the 'loop' parameter, 3.10 removed it.
+    kwargs = {"loop": asyncio.get_event_loop()} if sys.version_info < (3, 8) else {}
+
     # raises any exception from failed handle_texture_node() calls.
-    loop = asyncio.get_event_loop()
+    await asyncio.gather(*coros, **kwargs)
-    await asyncio.gather(*coros, loop=loop)
 
     log.info("fetch_texture_thumbs: Done downloading texture thumbnails")
 
@@ -929,8 +935,10 @@ async def download_texture(
         )
         downloaders.append(dlr)
 
-    loop = asyncio.get_event_loop()
+    # Python 3.8 deprecated the 'loop' parameter, 3.10 removed it.
-    return await asyncio.gather(*downloaders, return_exceptions=True, loop=loop)
+    kwargs = {"loop": asyncio.get_event_loop()} if sys.version_info < (3, 8) else {}
+
+    return await asyncio.gather(*downloaders, return_exceptions=True, **kwargs)
 
 
 async def upload_file(