Session Token Management APIs

sdk/cosmos/azure-cosmos/azure/cosmos/_base.py

@@ -284,23 +284,8 @@ def GetHeaders(  # pylint: disable=too-many-statements,too-many-branches
     if options.get("disableRUPerMinuteUsage"):
         headers[http_constants.HttpHeaders.DisableRUPerMinuteUsage] = options["disableRUPerMinuteUsage"]
 
-    if options.get("changeFeed") is True:
-        # On REST level, change feed is using IfNoneMatch/ETag instead of continuation.
-        if_none_match_value = None
-        if options.get("continuation"):
-            if_none_match_value = options["continuation"]
-        elif options.get("isStartFromBeginning") and not options["isStartFromBeginning"]:
-            if_none_match_value = "*"
-        elif options.get("startTime"):
-            start_time = options.get("startTime")
-            headers[http_constants.HttpHeaders.IfModified_since] = start_time
-        if if_none_match_value:
-            headers[http_constants.HttpHeaders.IfNoneMatch] = if_none_match_value
-
-        headers[http_constants.HttpHeaders.AIM] = http_constants.HttpHeaders.IncrementalFeedHeaderValue
-    else:
-        if options.get("continuation"):
-            headers[http_constants.HttpHeaders.Continuation] = options["continuation"]
+    if options.get("continuation"):
+        headers[http_constants.HttpHeaders.Continuation] = options["continuation"]
 
     if options.get("populatePartitionKeyRangeStatistics"):
         headers[http_constants.HttpHeaders.PopulatePartitionKeyRangeStatistics] = options[

sdk/cosmos/azure-cosmos/azure/cosmos/_change_feed/__init__.py

@@ -0,0 +1,20 @@
+# The MIT License (MIT)
+# Copyright (c) 2014 Microsoft Corporation
+
+# 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.

sdk/cosmos/azure-cosmos/azure/cosmos/_change_feed/aio/__init__.py

@@ -0,0 +1,20 @@
+# The MIT License (MIT)
+# Copyright (c) 2014 Microsoft Corporation
+
+# 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.

sdk/cosmos/azure-cosmos/azure/cosmos/_change_feed/aio/change_feed_fetcher.py

@@ -0,0 +1,206 @@
+# The MIT License (MIT)
+# Copyright (c) 2014 Microsoft Corporation
+
+# 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.
+
+"""Internal class for processing change feed implementation in the Azure Cosmos
+database service.
+"""
+import base64
+import copy
+import json
+from abc import ABC, abstractmethod
+from typing import Dict, Any, List
+
+from azure.cosmos import http_constants, exceptions
+from azure.cosmos._change_feed.change_feed_start_from import ChangeFeedStartFromPointInTime
+from azure.cosmos._change_feed.change_feed_state import ChangeFeedStateV1, ChangeFeedStateV2
+from azure.cosmos.aio import _retry_utility_async
+from azure.cosmos.exceptions import CosmosHttpResponseError
+
+# pylint: disable=protected-access
+
+class ChangeFeedFetcher(ABC):
+
+    @abstractmethod
+    async def fetch_next_block(self):
+        pass
+
+class ChangeFeedFetcherV1(ChangeFeedFetcher):
+    """Internal class for change feed fetch v1 implementation.
+     This is used when partition key range id is used or when the supplied continuation token is in just simple etag.
+     Please note v1 does not support split or merge.
+
+    """
+    def __init__(
+            self,
+            client,
+            resource_link: str,
+            feed_options: Dict[str, Any],
+            fetch_function):
+
+        self._client = client
+        self._feed_options = feed_options
+
+        self._change_feed_state = self._feed_options.pop("changeFeedState")
+        if not isinstance(self._change_feed_state, ChangeFeedStateV1):
+            raise ValueError(f"ChangeFeedFetcherV1 can not handle change feed state version"
+                             f" {type(self._change_feed_state)}")
+
+        self._resource_link = resource_link
+        self._fetch_function = fetch_function
+
+    async def fetch_next_block(self):
+        """Returns a block of results.
+
+        :return: List of results.
+        :rtype: list
+        """
+        async def callback():
+            return await self.fetch_change_feed_items(self._fetch_function)
+
+        return await _retry_utility_async.ExecuteAsync(self._client, self._client._global_endpoint_manager, callback)
+
+    async def fetch_change_feed_items(self, fetch_function) -> List[Dict[str, Any]]:
+        new_options = copy.deepcopy(self._feed_options)
+        new_options["changeFeedState"] = self._change_feed_state
+
+        self._change_feed_state.populate_feed_options(new_options)
+        is_s_time_first_fetch = self._change_feed_state._continuation is None
+        while True:
+            (fetched_items, response_headers) = await fetch_function(new_options)
+            continuation_key = http_constants.HttpHeaders.ETag
+            # In change feed queries, the continuation token is always populated. The hasNext() test is whether
+            # there is any items in the response or not.
+            self._change_feed_state.apply_server_response_continuation(
+                response_headers.get(continuation_key))
+
+            if fetched_items:
+                break
+
+            # When processing from point in time, there will be no initial results being returned,
+            # so we will retry with the new continuation token again
+            if (isinstance(self._change_feed_state._change_feed_start_from, ChangeFeedStartFromPointInTime)
+                    and is_s_time_first_fetch):
+                is_s_time_first_fetch = False
+            else:
+                break
+        return fetched_items
+
+
+class ChangeFeedFetcherV2(object):
+    """Internal class for change feed fetch v2 implementation.
+    """
+
+    def __init__(
+            self,
+            client,
+            resource_link: str,
+            feed_options: Dict[str, Any],
+            fetch_function):
+
+        self._client = client
+        self._feed_options = feed_options
+
+        self._change_feed_state: ChangeFeedStateV2 = self._feed_options.pop("changeFeedState")
+        if not isinstance(self._change_feed_state, ChangeFeedStateV2):
+            raise ValueError(f"ChangeFeedFetcherV2 can not handle change feed state version "
+                             f"{type(self._change_feed_state)}")
+
+        self._resource_link = resource_link
+        self._fetch_function = fetch_function
+
+    async def fetch_next_block(self):
+        """Returns a block of results.
+
+        :return: List of results.
+        :rtype: list
+        """
+
+        async def callback():
+            return await self.fetch_change_feed_items(self._fetch_function)
+
+        try:
+            return await _retry_utility_async.ExecuteAsync(
+                self._client,
+                self._client._global_endpoint_manager,
+                callback)
+        except CosmosHttpResponseError as e:
+            if exceptions._partition_range_is_gone(e) or exceptions._is_partition_split_or_merge(e):
+                # refresh change feed state
+                await self._change_feed_state.handle_feed_range_gone_async(
+                    self._client._routing_map_provider,
+                    self._resource_link)
+            else:
+                raise e
+
+        return await self.fetch_next_block()
+
+    async def fetch_change_feed_items(self, fetch_function) -> List[Dict[str, Any]]:
+        new_options = copy.deepcopy(self._feed_options)
+        new_options["changeFeedState"] = self._change_feed_state
+
+        self._change_feed_state.populate_feed_options(new_options)
+
+        is_s_time_first_fetch = True
+        while True:
+            (fetched_items, response_headers) = await fetch_function(new_options)
+
+            continuation_key = http_constants.HttpHeaders.ETag
+            # In change feed queries, the continuation token is always populated. The hasNext() test is whether
+            # there is any items in the response or not.
+            if fetched_items:
+                self._change_feed_state.apply_server_response_continuation(
+                    response_headers.get(continuation_key))
+                response_headers[continuation_key] = self._get_base64_encoded_continuation()
+                break
+
+            # when there is no items being returned, we will decide to retry based on:
+            # 1. When processing from point in time, there will be no initial results being returned,
+            # so we will retry with the new continuation token
+            # 2. if the feed range of the changeFeedState span multiple physical partitions
+            # then we will read from the next feed range until we have looped through all physical partitions
+            self._change_feed_state.apply_not_modified_response()
+            self._change_feed_state.apply_server_response_continuation(
+                response_headers.get(continuation_key))
+
+            #TODO: can this part logic be simplified
+            if (isinstance(self._change_feed_state._change_feed_start_from, ChangeFeedStartFromPointInTime)
+                    and is_s_time_first_fetch):
+                response_headers[continuation_key] = self._get_base64_encoded_continuation()
+                is_s_time_first_fetch = False
+                should_retry = True
+            else:
+                self._change_feed_state._continuation._move_to_next_token()
+                response_headers[continuation_key] = self._get_base64_encoded_continuation()
+                should_retry = self._change_feed_state.should_retry_on_not_modified_response()
+                is_s_time_first_fetch = False
+
+            if not should_retry:
+                break
+
+        return fetched_items
+
+    def _get_base64_encoded_continuation(self) -> str:
+        continuation_json = json.dumps(self._change_feed_state.to_dict())
+        json_bytes = continuation_json.encode('utf-8')
+        # Encode the bytes to a Base64 string
+        base64_bytes = base64.b64encode(json_bytes)
+        # Convert the Base64 bytes to a string
+        return base64_bytes.decode('utf-8')