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+# --------------------------------------------------------------------------
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+#
+# The MIT License (MIT)
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the ""Software""), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+#
+# --------------------------------------------------------------------------
+from collections.abc import AsyncIterator
+import logging
+
+_LOGGER = logging.getLogger(__name__)
+
+class AsyncPagedMixin(AsyncIterator):
+
+ def __init__(self, *args, **kwargs):
+ """Bring async to Paging.
+
+ "async_command" is mandatory keyword argument for this mixin to work.
+ """
+ self._async_get_next = kwargs.get("async_command")
+ if not self._async_get_next:
+ _LOGGER.debug("Paging async iterator protocol is not available for %s",
+ self.__class__.__name__)
+
+ async def async_get(self, url):
+ """Get an arbitrary page.
+
+ This resets the iterator and then fully consumes it to return the
+ specific page **only**.
+
+ :param str url: URL to arbitrary page results.
+ """
+ self.reset()
+ self.next_link = url
+ return await self.async_advance_page()
+
+ async def async_advance_page(self):
+ if not self._async_get_next:
+ raise NotImplementedError(
+ "The class %s does not support async paging at the moment.",
+ self.__class__.__name__
+ )
+ if self.next_link is None:
+ raise StopAsyncIteration("End of paging")
+ self._current_page_iter_index = 0
+ self._response = await self._async_get_next(self.next_link)
+ self._derserializer(self, self._response)
+ return self.current_page
+
+ async def __anext__(self):
+ """Iterate through responses."""
+ # Storing the list iterator might work out better, but there's no
+ # guarantee that some code won't replace the list entirely with a copy,
+ # invalidating an list iterator that might be saved between iterations.
+ if self.current_page and self._current_page_iter_index < len(self.current_page):
+ response = self.current_page[self._current_page_iter_index]
+ self._current_page_iter_index += 1
+ return response
+ else:
+ await self.async_advance_page()
+ return await self.__anext__()