Add tasks management module for async

confluent_server/confluent/tasks.py

@@ -0,0 +1,82 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2024 Lenovo
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Manage tasks, loops, and background
+
+import asyncio
+import inspect
+import random
+
+tsks = {}
+
+
+tasksitter = None
+logtrace = None
+
+async def _sit_tasks():
+    while True:
+        while not tsks:
+            await asyncio.sleep(15)
+        tsk_list = [tsks[x] for x in tsks]
+        cmpl, pnding = await asyncio.wait(tsk_list, return_when=asyncio.FIRST_COMPLETED, timeout=15)
+        for tskid in list(tsks):
+            if tsks[tskid].done():
+                try:
+                    tsk = tsks[tskid]
+                    del tsks[tskid]
+                    await tsk
+                except Exception as e:
+                    if logtrace:
+                        logtrace()
+                    else:
+                        print(repr(e))
+
+
+def spawn_task(coro):
+    try:
+        return asyncio.create_task(coro)
+    except AttributeError:
+        return asyncio.get_event_loop().create_task(coro)
+
+
+def spawn(coro):
+    global tasksitter
+    if not tasksitter:
+        tasksitter = spawn_task(_sit_tasks())
+    tskid = random.random()
+    while tskid in tsks:
+        tskid = random.random()
+    tsks[tskid] = spawn_task(coro)
+
+
+async def _sleep_and_run(sleeptime, func, args):
+    await asyncio.sleep(sleeptime)
+    ret = func(*args)
+    if inspect.isawaitable(ret):
+        await ret
+
+
+def spawn_after(sleeptime, func, *args):
+    if func is None:
+        raise Exception('tf')
+    return spawn(_sleep_and_run(sleeptime, func, args))
+
+
+def spawn_task_after(sleeptime, func, *args):
+    if func is None:
+        raise Exception('tf')
+    return spawn_task(_sleep_and_run(sleeptime, func, args))
+