README updates and CI fixes (#403)

Fixes #59
Fixes #379

.github/workflows/ci.yml

@@ -44,7 +44,9 @@ jobs:
       - if: ${{ !endsWith(matrix.os, '-arm') }}
         uses: actions/setup-python@v4
         with:
-          python-version: ${{ matrix.python }}
+          # Due to a yet-uninvestigated change in 3.11.6 that breaks the Rust
+          # linker on Windows, we are pinning 3.11 to 3.11.5 here
+          python-version: ${{ matrix.python == '3.11' && '3.11.5' || matrix.python }}
       - if: ${{ matrix.os == 'ubuntu-arm' }}
         uses: deadsnakes/action@v2.1.1
         with:

README.md

@@ -282,7 +282,7 @@ Some things to note about the above code:
   does the same thing
 * Clients can have many more options not shown here (e.g. data converters and interceptors)
 * A string can be used instead of the method reference to call a workflow by name (e.g. if defined in another language)
-* Clients to not work across forks
+* Clients do not work across forks
 
 Clients also provide a shallow copy of their config for use in making slightly different clients backed by the same
 connection. For instance, given the `client` above, this is how to have a client in another namespace:
@@ -732,6 +732,9 @@ The time-skipping `temporalio.testing.WorkflowEnvironment` can be created via th
 This internally downloads the Temporal time-skipping test server to a temporary directory if it doesn't already exist,
 then starts the test server which has special APIs for skipping time.
 
+**NOTE:** The time-skipping test environment does not work on ARM. The SDK will try to download the x64 binary on macOS
+for use with the Intel emulator, but for Linux or Windows ARM there is no proper time-skipping test server at this time.
+
 ##### Automatic Time Skipping
 
 Anytime a workflow result is waited on, the time-skipping server automatically advances to the next event it can. To
@@ -1272,8 +1275,9 @@ Below are known compatibility issues with the Python SDK.
 #### gevent Patching
 
 When using `gevent.monkey.patch_all()`, asyncio event loops can get messed up, especially those using custom event loops
-like Temporal. See [this gevent issue](https://github.com/gevent/gevent/issues/982) and
-[this Python SDK issue](https://github.com/temporalio/sdk-python/issues/59) for more details.
+like Temporal. See [this gevent issue](https://github.com/gevent/gevent/issues/982). This is a known incompatibility and
+users are encouraged to not use gevent in asyncio applications (including Temporal). But if you must, there is
+[a sample](https://github.com/temporalio/samples-python/tree/main/gevent_async) showing how it is possible.
 
 # Development
 

tests/test_client.py

@@ -910,10 +910,7 @@ async def test_schedule_backfill(
         pytest.skip("Java test server doesn't support schedules")
     await assert_no_schedules(client)
 
-    # Just in case it's on the minute boundary, move it off
-    now = datetime.utcnow()
-    if now.second == 0:
-        now += timedelta(seconds=1)
+    begin = datetime(year=2020, month=1, day=20, hour=5)
 
     # Create paused schedule that runs every minute and has two backfills
     handle = await client.create_schedule(
@@ -934,8 +931,8 @@ async def test_schedule_backfill(
         ),
         backfill=[
             ScheduleBackfill(
-                start_at=now - timedelta(minutes=30),
-                end_at=now - timedelta(minutes=29),
+                start_at=begin - timedelta(minutes=30),
+                end_at=begin - timedelta(minutes=29),
                 overlap=ScheduleOverlapPolicy.ALLOW_ALL,
             )
         ],
@@ -945,13 +942,13 @@ async def test_schedule_backfill(
     # Add two more backfills and and -2m will be deduped
     await handle.backfill(
         ScheduleBackfill(
-            start_at=now - timedelta(minutes=4),
-            end_at=now - timedelta(minutes=2),
+            start_at=begin - timedelta(minutes=4),
+            end_at=begin - timedelta(minutes=2),
             overlap=ScheduleOverlapPolicy.ALLOW_ALL,
         ),
         ScheduleBackfill(
-            start_at=now - timedelta(minutes=2),
-            end_at=now,
+            start_at=begin - timedelta(minutes=2),
+            end_at=begin,
             overlap=ScheduleOverlapPolicy.ALLOW_ALL,
         ),
     )

tests/testing/test_workflow.py

@@ -132,8 +132,7 @@ async def test_workflow_env_time_skipping_heartbeat_timeout():
             # Check the causes until heartbeat timeout
             assert isinstance(err.value.cause, ActivityError)
             assert isinstance(err.value.cause.cause, TimeoutError)
-            assert isinstance(err.value.cause.cause.cause, TimeoutError)
-            assert err.value.cause.cause.cause.type == TimeoutType.HEARTBEAT
+            assert err.value.cause.cause.type == TimeoutType.HEARTBEAT
 
 
 @workflow.defn