feat: add comprehensive GitHub workflow and development tools

app/.venv/Lib/site-packages/celery/concurrency/__init__.py

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+"""Pool implementation abstract factory, and alias definitions."""
+import os
+
+# Import from kombu directly as it's used
+# early in the import stage, where celery.utils loads
+# too much (e.g., for eventlet patching)
+from kombu.utils.imports import symbol_by_name
+
+__all__ = ('get_implementation', 'get_available_pool_names',)
+
+ALIASES = {
+    'prefork': 'celery.concurrency.prefork:TaskPool',
+    'eventlet': 'celery.concurrency.eventlet:TaskPool',
+    'gevent': 'celery.concurrency.gevent:TaskPool',
+    'solo': 'celery.concurrency.solo:TaskPool',
+    'processes': 'celery.concurrency.prefork:TaskPool',  # XXX compat alias
+}
+
+try:
+    import concurrent.futures  # noqa
+except ImportError:
+    pass
+else:
+    ALIASES['threads'] = 'celery.concurrency.thread:TaskPool'
+#
+# Allow for an out-of-tree worker pool implementation. This is used as follows:
+#
+#   - Set the environment variable CELERY_CUSTOM_WORKER_POOL to the name of
+#     an implementation of :class:`celery.concurrency.base.BasePool` in the
+#     standard Celery format of "package:class".
+#   - Select this pool using '--pool custom'.
+#
+try:
+    custom = os.environ.get('CELERY_CUSTOM_WORKER_POOL')
+except KeyError:
+    pass
+else:
+    ALIASES['custom'] = custom
+
+
+def get_implementation(cls):
+    """Return pool implementation by name."""
+    return symbol_by_name(cls, ALIASES)
+
+
+def get_available_pool_names():
+    """Return all available pool type names."""
+    return tuple(ALIASES.keys())