From c186a575f68ae4176224f082c39e305fba362f75 Mon Sep 17 00:00:00 2001
From: FinnStutzenstein <finn.stutzenstein@hotmail.de>
Date: Wed, 3 Jun 2020 14:11:25 +0200
Subject: [PATCH] Fixed incomplete autoupdates

A conceptional issue in `get_data_since` leads to incomplete
autoupdates. The behaviour was long time in the code, but only with a
lot of autoupdates (high concurrency) and the autoupdate delay I noticed
the bug during testing. I'm sure, that this issue might have caused
incomplete autoupdates (which the user may experience as "lost
autoupdates") in previous productive instances. Instead of quering a
range (from_change_id to to_change_id) one now can only get data from a
change id up to the max change id in the element cache. The max change
id gets now returned by `get_data_since`.

I also added a get_all_data with the capability of returning the
max_change_id at this point of time.

As a usability-"fix" (more like a fix the result of a bug, not the bug
itself) a refresh button for a poll was added, that issues an autoupdate
for the poll and all options.
---
 .../assignment-poll.component.html            |  8 ++
 .../motion-poll/motion-poll.component.html    |  6 ++
 .../polls/components/base-poll.component.ts   |  4 +
 .../poll-progress/poll-progress.component.ts  | 72 +++++++++------
 .../services/base-poll-repository.service.ts  | 15 +--
 openslides/poll/views.py                      | 15 +++
 openslides/utils/autoupdate.py                | 43 +++++----
 openslides/utils/cache.py                     | 43 ++++++---
 openslides/utils/cache_providers.py           | 91 +++++++++++++++----
 .../utils/consumer_autoupdate_strategy.py     | 20 ++--
 openslides/utils/rest_api.py                  |  4 +-
 tests/test_case.py                            |  2 +-
 tests/unit/utils/test_cache.py                | 29 ++++--
 13 files changed, 246 insertions(+), 106 deletions(-)

diff --git a/client/src/app/site/assignments/components/assignment-poll/assignment-poll.component.html b/client/src/app/site/assignments/components/assignment-poll/assignment-poll.component.html
index ba7e7fec9..8131d58c7 100644
--- a/client/src/app/site/assignments/components/assignment-poll/assignment-poll.component.html
+++ b/client/src/app/site/assignments/components/assignment-poll/assignment-poll.component.html
@@ -119,11 +119,19 @@
             <span>{{ 'Ballot papers' | translate }}</span>
         </button>
         <mat-divider></mat-divider>
+        <!-- Refresh Button -->
+        <button mat-menu-item (click)="refreshPoll()">
+            <mat-icon>refresh</mat-icon>
+            <span>{{ 'Refresh' | translate }}</span>
+        </button>
+
         <!-- Reset Button -->
         <button mat-menu-item (click)="resetState()">
             <mat-icon color="warn">replay</mat-icon>
             <span>{{ 'Reset state' | translate }}</span>
         </button>
+
+        <!-- Delete button -->
         <button mat-menu-item class="red-warning-text" (click)="onDeletePoll()">
             <mat-icon>delete</mat-icon>
             <span>{{ 'Delete' | translate }}</span>
diff --git a/client/src/app/site/motions/modules/motion-poll/motion-poll/motion-poll.component.html b/client/src/app/site/motions/modules/motion-poll/motion-poll/motion-poll.component.html
index 4ee58bb67..beb3a71fa 100644
--- a/client/src/app/site/motions/modules/motion-poll/motion-poll/motion-poll.component.html
+++ b/client/src/app/site/motions/modules/motion-poll/motion-poll/motion-poll.component.html
@@ -128,6 +128,12 @@
     </button>
     <div *osPerms="'motions.can_manage_polls'">
         <mat-divider></mat-divider>
+        <!-- Refresh Button -->
+        <button mat-menu-item (click)="refreshPoll()">
+            <mat-icon>refresh</mat-icon>
+            <span>{{ 'Refresh' | translate }}</span>
+        </button>
+
         <!-- Reset Button -->
         <button mat-menu-item (click)="resetState()">
             <mat-icon color="warn">replay</mat-icon>
diff --git a/client/src/app/site/polls/components/base-poll.component.ts b/client/src/app/site/polls/components/base-poll.component.ts
index 52d5a40ad..591454019 100644
--- a/client/src/app/site/polls/components/base-poll.component.ts
+++ b/client/src/app/site/polls/components/base-poll.component.ts
@@ -103,4 +103,8 @@ export abstract class BasePollComponent<V extends ViewBasePoll, S extends PollSe
     protected initPoll(model: V): void {
         this._poll = model;
     }
+
+    public refreshPoll(): void {
+        this.repo.refresh(this._poll);
+    }
 }
diff --git a/client/src/app/site/polls/components/poll-progress/poll-progress.component.ts b/client/src/app/site/polls/components/poll-progress/poll-progress.component.ts
index 909f86df0..46e891bea 100644
--- a/client/src/app/site/polls/components/poll-progress/poll-progress.component.ts
+++ b/client/src/app/site/polls/components/poll-progress/poll-progress.component.ts
@@ -1,4 +1,4 @@
-import { Component, Input } from '@angular/core';
+import { Component, Input, OnDestroy } from '@angular/core';
 import { MatSnackBar } from '@angular/material/snack-bar';
 import { Title } from '@angular/platform-browser';
 
@@ -16,7 +16,7 @@ import { ViewUser } from 'app/site/users/models/view-user';
     templateUrl: './poll-progress.component.html',
     styleUrls: ['./poll-progress.component.scss']
 })
-export class PollProgressComponent extends BaseViewComponent {
+export class PollProgressComponent extends BaseViewComponent implements OnDestroy {
     private pollId: number = null;
     private pollSubscription: Subscription = null;
 
@@ -25,34 +25,11 @@ export class PollProgressComponent extends BaseViewComponent {
         if (value.id !== this.pollId) {
             this.pollId = value.id;
 
-            if (this.pollSubscription !== null) {
-                this.pollSubscription.unsubscribe();
-                this.pollSubscription = null;
-            }
-
+            this.unsubscribePoll();
             this.pollSubscription = this.pollRepo.getViewModelObservable(this.pollId).subscribe(poll => {
                 if (poll) {
                     this._poll = poll;
-
-                    // We may cannot use this.poll.votescast during the voting, since it can
-                    // be reported with false values from the server
-                    // -> calculate the votes on our own.
-                    const ids = new Set();
-                    for (const option of this.poll.options) {
-                        for (const vote of option.votes) {
-                            if (vote.user_id) {
-                                ids.add(vote.user_id);
-                            }
-                        }
-                    }
-                    this.votescast = ids.size;
-
-                    // But sometimes there are not enough votes (poll.votescast is higher).
-                    // If this happens, take the value from the poll
-                    if (this.poll.votescast > this.votescast) {
-                        this.votescast = this.poll.votescast;
-                    }
-
+                    this.updateVotescast();
                     this.calculateMaxUsers();
                 }
             });
@@ -63,7 +40,7 @@ export class PollProgressComponent extends BaseViewComponent {
     }
     private _poll: ViewBasePoll;
 
-    public votescast: number;
+    public votescast = 0;
     public max: number;
     public valueInPercent: number;
 
@@ -82,6 +59,34 @@ export class PollProgressComponent extends BaseViewComponent {
         });
     }
 
+    private updateVotescast(): void {
+        if (this.poll.votescast === 0) {
+            this.votescast = 0;
+            return;
+        }
+
+        // We may cannot use this.poll.votescast during the voting, since it can
+        // be reported with false values from the server
+        // -> calculate the votes on our own.
+        const ids = new Set();
+        for (const option of this.poll.options) {
+            for (const vote of option.votes) {
+                if (vote.user_id) {
+                    ids.add(vote.user_id);
+                }
+            }
+        }
+        if (ids.size > this.votescast) {
+            this.votescast = ids.size;
+        }
+
+        // But sometimes there are not enough votes (poll.votescast is higher).
+        // If this happens, take the value from the poll
+        if (this.poll.votescast > this.votescast) {
+            this.votescast = this.poll.votescast;
+        }
+    }
+
     private calculateMaxUsers(allUsers?: ViewUser[]): void {
         if (!this.poll) {
             return;
@@ -95,4 +100,15 @@ export class PollProgressComponent extends BaseViewComponent {
         this.max = allUsers.length;
         this.valueInPercent = this.poll ? (this.votescast / this.max) * 100 : 0;
     }
+
+    public ngOnDestroy(): void {
+        this.unsubscribePoll();
+    }
+
+    private unsubscribePoll(): void {
+        if (this.pollSubscription !== null) {
+            this.pollSubscription.unsubscribe();
+            this.pollSubscription = null;
+        }
+    }
 }
diff --git a/client/src/app/site/polls/services/base-poll-repository.service.ts b/client/src/app/site/polls/services/base-poll-repository.service.ts
index 5a06dca7a..fe766acee 100644
--- a/client/src/app/site/polls/services/base-poll-repository.service.ts
+++ b/client/src/app/site/polls/services/base-poll-repository.service.ts
@@ -72,16 +72,19 @@ export abstract class BasePollRepositoryService<
         }
     }
 
-    public resetPoll(poll: BasePoll): Promise<void> {
-        return this.http.post(`${this.restPath(poll)}/reset/`);
-    }
-
     private restPath(poll: BasePoll): string {
         return `/rest/${poll.collectionString}/${poll.id}`;
     }
 
+    public resetPoll(poll: BasePoll): Promise<void> {
+        return this.http.post(`${this.restPath(poll)}/reset/`);
+    }
+
     public pseudoanonymize(poll: BasePoll): Promise<void> {
-        const path = this.restPath(poll);
-        return this.http.post(`${path}/pseudoanonymize/`);
+        return this.http.post(`${this.restPath(poll)}/pseudoanonymize/`);
+    }
+
+    public refresh(poll: BasePoll): Promise<void> {
+        return this.http.post(`${this.restPath(poll)}/refresh/`);
     }
 }
diff --git a/openslides/poll/views.py b/openslides/poll/views.py
index 06da7637b..b89cdda02 100644
--- a/openslides/poll/views.py
+++ b/openslides/poll/views.py
@@ -222,6 +222,15 @@ class BasePollViewSet(ModelViewSet):
 
         return Response()
 
+    @detail_route(methods=["POST"])
+    @transaction.atomic
+    def refresh(self, request, pk):
+        poll = self.get_object()
+        inform_changed_data(poll, final_data=True)
+        inform_changed_data(poll.get_options(), final_data=True)
+        inform_changed_data(poll.get_votes(), final_data=True)
+        return Response()
+
     def assert_can_vote(self, poll, request):
         """
         Raises a permission denied, if the user is not allowed to vote (or has already voted).
@@ -263,6 +272,12 @@ class BasePollViewSet(ModelViewSet):
             )
         return value
 
+    def has_manage_permissions(self):
+        """
+        Returns true, if the request user has manage perms.
+        """
+        raise NotImplementedError()
+
     def convert_option_data(self, poll, data):
         """
         May be overwritten by subclass. Adjusts the option data based on the now existing poll
diff --git a/openslides/utils/autoupdate.py b/openslides/utils/autoupdate.py
index d1fffe8df..0dfc3b46e 100644
--- a/openslides/utils/autoupdate.py
+++ b/openslides/utils/autoupdate.py
@@ -286,9 +286,7 @@ class AutoupdateBundleMiddleware:
                 user_id = request.user.pk or 0
                 # Inject the autoupdate in the response.
                 # The complete response body will be overwritten!
-                autoupdate = async_to_sync(get_autoupdate_data)(
-                    change_id, change_id, user_id
-                )
+                _, autoupdate = async_to_sync(get_autoupdate_data)(change_id, user_id)
                 content = {"autoupdate": autoupdate, "data": response.data}
                 # Note: autoupdate may be none on skipped ones (which should not happen
                 # since the user has made the request....)
@@ -299,17 +297,25 @@ class AutoupdateBundleMiddleware:
 
 
 async def get_autoupdate_data(
-    from_change_id: int, to_change_id: int, user_id: int
-) -> Optional[AutoupdateFormat]:
+    from_change_id: int, user_id: int
+) -> Tuple[int, Optional[AutoupdateFormat]]:
+    """
+    Returns the max_change_id and the autoupdate from from_change_id to max_change_id
+    """
     try:
-        changed_elements, deleted_element_ids = await element_cache.get_data_since(
-            user_id, from_change_id, to_change_id
-        )
+        (
+            max_change_id,
+            changed_elements,
+            deleted_element_ids,
+        ) = await element_cache.get_data_since(user_id, from_change_id)
     except ChangeIdTooLowError:
         # The change_id is lower the the lowerst change_id in redis. Return all data
-        changed_elements = await element_cache.get_all_data_list(user_id)
-        all_data = True
+        (
+            max_change_id,
+            changed_elements,
+        ) = await element_cache.get_all_data_list_with_max_change_id(user_id)
         deleted_elements: Dict[str, List[int]] = {}
+        all_data = True
     else:
         all_data = False
         deleted_elements = defaultdict(list)
@@ -320,15 +326,18 @@ async def get_autoupdate_data(
     # Check, if the autoupdate has any data.
     if not changed_elements and not deleted_element_ids:
         # Skip empty updates
-        return None
+        return max_change_id, None
     else:
         # Normal autoupdate with data
-        return AutoupdateFormat(
-            changed=changed_elements,
-            deleted=deleted_elements,
-            from_change_id=from_change_id,
-            to_change_id=to_change_id,
-            all_data=all_data,
+        return (
+            max_change_id,
+            AutoupdateFormat(
+                changed=changed_elements,
+                deleted=deleted_elements,
+                from_change_id=from_change_id,
+                to_change_id=max_change_id,
+                all_data=all_data,
+            ),
         )
 
 
diff --git a/openslides/utils/cache.py b/openslides/utils/cache.py
index 14dec14d2..bfa87b2b7 100644
--- a/openslides/utils/cache.py
+++ b/openslides/utils/cache.py
@@ -239,8 +239,23 @@ class ElementCache:
         }
         If the user id is given the data will be restricted for this user.
         """
+        all_data = await self.cache_provider.get_all_data()
+        return await self.format_all_data(all_data, user_id)
+
+    async def get_all_data_list_with_max_change_id(
+        self, user_id: Optional[int] = None
+    ) -> Tuple[int, Dict[str, List[Dict[str, Any]]]]:
+        (
+            max_change_id,
+            all_data,
+        ) = await self.cache_provider.get_all_data_with_max_change_id()
+        return max_change_id, await self.format_all_data(all_data, user_id)
+
+    async def format_all_data(
+        self, all_data_bytes: Dict[bytes, bytes], user_id: Optional[int]
+    ) -> Dict[str, List[Dict[str, Any]]]:
         all_data: Dict[str, List[Dict[str, Any]]] = defaultdict(list)
-        for element_id, data in (await self.cache_provider.get_all_data()).items():
+        for element_id, data in all_data_bytes.items():
             collection, _ = split_element_id(element_id)
             element = json.loads(data.decode())
             element.pop(
@@ -299,16 +314,15 @@ class ElementCache:
         return restricted_elements[0] if restricted_elements else None
 
     async def get_data_since(
-        self, user_id: Optional[int] = None, change_id: int = 0, max_change_id: int = -1
-    ) -> Tuple[Dict[str, List[Dict[str, Any]]], List[str]]:
+        self, user_id: Optional[int] = None, change_id: int = 0
+    ) -> Tuple[int, Dict[str, List[Dict[str, Any]]], List[str]]:
         """
-        Returns all data since change_id until max_change_id (included).
-        max_change_id -1 means the highest change_id. If the user id is given the
+        Returns all data since change_id until the max change id.cIf the user id is given the
         data will be restricted for this user.
 
-        Returns two values inside a tuple. The first value is a dict where the
-        key is the collection and the value is a list of data. The second
-        is a list of element_ids with deleted elements.
+        Returns three values inside a tuple. The first value is the max change id. The second
+        value is a dict where the key is the collection and the value is a list of data.
+        The third is a list of element_ids with deleted elements.
 
         Only returns elements with the change_id or newer. When change_id is 0,
         all elements are returned.
@@ -319,7 +333,11 @@ class ElementCache:
         that the cache does not know about.
         """
         if change_id == 0:
-            return (await self.get_all_data_list(user_id), [])
+            (
+                max_change_id,
+                changed_elements,
+            ) = await self.get_all_data_list_with_max_change_id(user_id)
+            return (max_change_id, changed_elements, [])
 
         # This raises a Runtime Exception, if there is no change_id
         lowest_change_id = await self.get_lowest_change_id()
@@ -332,11 +350,10 @@ class ElementCache:
             )
 
         (
+            max_change_id,
             raw_changed_elements,
             deleted_elements,
-        ) = await self.cache_provider.get_data_since(
-            change_id, max_change_id=max_change_id
-        )
+        ) = await self.cache_provider.get_data_since(change_id)
         changed_elements = {
             collection: [json.loads(value.decode()) for value in value_list]
             for collection, value_list in raw_changed_elements.items()
@@ -381,7 +398,7 @@ class ElementCache:
                 else:
                     changed_elements[collection] = restricted_elements
 
-        return (changed_elements, deleted_elements)
+        return (max_change_id, changed_elements, deleted_elements)
 
     async def get_current_change_id(self) -> int:
         """
diff --git a/openslides/utils/cache_providers.py b/openslides/utils/cache_providers.py
index 987904424..d37d2e058 100644
--- a/openslides/utils/cache_providers.py
+++ b/openslides/utils/cache_providers.py
@@ -57,6 +57,9 @@ class ElementCacheProvider(Protocol):
     async def get_all_data(self) -> Dict[bytes, bytes]:
         ...
 
+    async def get_all_data_with_max_change_id(self) -> Tuple[int, Dict[bytes, bytes]]:
+        ...
+
     async def get_collection_data(self, collection: str) -> Dict[int, bytes]:
         ...
 
@@ -69,8 +72,8 @@ class ElementCacheProvider(Protocol):
         ...
 
     async def get_data_since(
-        self, change_id: int, max_change_id: int = -1
-    ) -> Tuple[Dict[str, List[bytes]], List[str]]:
+        self, change_id: int
+    ) -> Tuple[int, Dict[str, List[bytes]], List[str]]:
         ...
 
     async def get_current_change_id(self) -> int:
@@ -137,6 +140,24 @@ class RedisCacheProvider:
             False,
         ),
         "get_all_data": ("return redis.call('hgetall', KEYS[1])", True),
+        "get_all_data_with_max_change_id": (
+            """
+            local tmp = redis.call('zrevrangebyscore', KEYS[2], '+inf', '-inf', 'WITHSCORES', 'LIMIT', 0, 1)
+            local max_change_id
+            if next(tmp) == nil then
+                -- The key does not exist
+                return redis.error_reply("cache_reset")
+            else
+                max_change_id = tmp[2]
+            end
+
+            local all_data = redis.call('hgetall', KEYS[1])
+            table.insert(all_data, 'max_change_id')
+            table.insert(all_data, max_change_id)
+            return all_data
+            """,
+            True,
+        ),
         "get_collection_data": (
             """
             local cursor = 0
@@ -233,11 +254,24 @@ class RedisCacheProvider:
         ),
         "get_data_since": (
             """
-            -- Get change ids of changed elements
-            local element_ids = redis.call('zrangebyscore', KEYS[2], ARGV[1], ARGV[2])
+            -- get max change id
+            local tmp = redis.call('zrevrangebyscore', KEYS[2], '+inf', '-inf', 'WITHSCORES', 'LIMIT', 0, 1)
+            local max_change_id
+            if next(tmp) == nil then
+                -- The key does not exist
+                return redis.error_reply("cache_reset")
+            else
+                max_change_id = tmp[2]
+            end
 
-            -- Save elements in array. Rotate element_id and element_json
+            -- Get change ids of changed elements
+            local element_ids = redis.call('zrangebyscore', KEYS[2], ARGV[1], max_change_id)
+
+            -- Save elements in array. First is the max_change_id with the key "max_change_id"
+            -- Than rotate element_id and element_json. This is ocnverted into a dict in python code.
             local elements = {}
+            table.insert(elements, 'max_change_id')
+            table.insert(elements, max_change_id)
             for _, element_id in pairs(element_ids) do
               table.insert(elements, element_id)
               table.insert(elements, redis.call('hget', KEYS[1], element_id))
@@ -320,9 +354,25 @@ class RedisCacheProvider:
         Returns all data from the full_data_cache in a mapping from element_id to the element.
         """
         return await aioredis.util.wait_make_dict(
-            self.eval("get_all_data", [self.full_data_cache_key], read_only=True)
+            self.eval("get_all_data", keys=[self.full_data_cache_key], read_only=True)
         )
 
+    @ensure_cache_wrapper()
+    async def get_all_data_with_max_change_id(self) -> Tuple[int, Dict[bytes, bytes]]:
+        """
+        Returns all data from the full_data_cache in a mapping from element_id to the element and
+        the max change id.
+        """
+        all_data = await aioredis.util.wait_make_dict(
+            self.eval(
+                "get_all_data_with_max_change_id",
+                keys=[self.full_data_cache_key, self.change_id_cache_key],
+                read_only=True,
+            )
+        )
+        max_change_id = int(all_data.pop(b"max_change_id"))
+        return max_change_id, all_data
+
     @ensure_cache_wrapper()
     async def get_collection_data(self, collection: str) -> Dict[int, bytes]:
         """
@@ -376,8 +426,8 @@ class RedisCacheProvider:
 
     @ensure_cache_wrapper()
     async def get_data_since(
-        self, change_id: int, max_change_id: int = -1
-    ) -> Tuple[Dict[str, List[bytes]], List[str]]:
+        self, change_id: int
+    ) -> Tuple[int, Dict[str, List[bytes]], List[str]]:
         """
         Returns all elements since a change_id (included) and until the max_change_id (included).
 
@@ -388,8 +438,6 @@ class RedisCacheProvider:
         changed_elements: Dict[str, List[bytes]] = defaultdict(list)
         deleted_elements: List[str] = []
 
-        # Convert max_change_id to a string. If its negative, use the string '+inf'
-        redis_max_change_id = "+inf" if max_change_id < 0 else str(max_change_id)
         # lua script that returns gets all element_ids from change_id_cache_key
         # and then uses each element_id on full_data or restricted_data.
         # It returns a list where the odd values are the change_id and the
@@ -399,13 +447,14 @@ class RedisCacheProvider:
             self.eval(
                 "get_data_since",
                 keys=[self.full_data_cache_key, self.change_id_cache_key],
-                args=[change_id, redis_max_change_id],
+                args=[change_id],
                 read_only=True,
             )
         )
 
+        max_change_id = int(elements[b"max_change_id"].decode())  # type: ignore
         for element_id, element_json in elements.items():
-            if element_id.startswith(b"_config"):
+            if element_id.startswith(b"_config") or element_id == b"max_change_id":
                 # Ignore config values from the change_id cache key
                 continue
             if element_json is None:
@@ -414,7 +463,7 @@ class RedisCacheProvider:
             else:
                 collection, id = split_element_id(element_id)
                 changed_elements[collection].append(element_json)
-        return changed_elements, deleted_elements
+        return max_change_id, changed_elements, deleted_elements
 
     @ensure_cache_wrapper()
     async def get_current_change_id(self) -> int:
@@ -562,6 +611,11 @@ class MemoryCacheProvider:
     async def get_all_data(self) -> Dict[bytes, bytes]:
         return str_dict_to_bytes(self.full_data)
 
+    async def get_all_data_with_max_change_id(self) -> Tuple[int, Dict[bytes, bytes]]:
+        all_data = await self.get_all_data()
+        max_change_id = await self.get_current_change_id()
+        return max_change_id, all_data
+
     async def get_collection_data(self, collection: str) -> Dict[int, bytes]:
         out = {}
         query = f"{collection}:"
@@ -602,16 +656,14 @@ class MemoryCacheProvider:
         return change_id
 
     async def get_data_since(
-        self, change_id: int, max_change_id: int = -1
-    ) -> Tuple[Dict[str, List[bytes]], List[str]]:
+        self, change_id: int
+    ) -> Tuple[int, Dict[str, List[bytes]], List[str]]:
         changed_elements: Dict[str, List[bytes]] = defaultdict(list)
         deleted_elements: List[str] = []
 
         all_element_ids: Set[str] = set()
         for data_change_id, element_ids in self.change_id_data.items():
-            if data_change_id >= change_id and (
-                max_change_id == -1 or data_change_id <= max_change_id
-            ):
+            if data_change_id >= change_id:
                 all_element_ids.update(element_ids)
 
         for element_id in all_element_ids:
@@ -621,7 +673,8 @@ class MemoryCacheProvider:
             else:
                 collection, id = split_element_id(element_id)
                 changed_elements[collection].append(element_json.encode())
-        return changed_elements, deleted_elements
+        max_change_id = await self.get_current_change_id()
+        return (max_change_id, changed_elements, deleted_elements)
 
     async def get_current_change_id(self) -> int:
         if self.change_id_data:
diff --git a/openslides/utils/consumer_autoupdate_strategy.py b/openslides/utils/consumer_autoupdate_strategy.py
index f5a03cb29..0c4922028 100644
--- a/openslides/utils/consumer_autoupdate_strategy.py
+++ b/openslides/utils/consumer_autoupdate_strategy.py
@@ -19,7 +19,6 @@ class ConsumerAutoupdateStrategy:
         # client_change_id is int: the change_id, the client knows about, so the next
         # update must be from client_change_id+1 .. <next clange_id>
         self.client_change_id: Optional[int] = None
-        self.max_seen_change_id = 0
         self.next_send_time = None
         self.timer_task_handle: Optional[Task[None]] = None
         self.lock = asyncio.Lock()
@@ -35,18 +34,17 @@ class ConsumerAutoupdateStrategy:
         async with self.lock:
             await self.stop_timer()
 
-            self.max_seen_change_id = await element_cache.get_current_change_id()
-            print(self.max_seen_change_id)
+            max_change_id = await element_cache.get_current_change_id()
             self.client_change_id = change_id
 
-            if self.client_change_id == self.max_seen_change_id:
+            if self.client_change_id == max_change_id:
                 # The client is up-to-date, so nothing will be done
                 return None
 
-            if self.client_change_id > self.max_seen_change_id:
+            if self.client_change_id > max_change_id:
                 message = (
                     f"Requested change_id {self.client_change_id} is higher than the "
-                    + f"highest change_id {self.max_seen_change_id}."
+                    + f"highest change_id {max_change_id}."
                 )
                 raise ChangeIdTooHighException(message, in_response=in_response)
 
@@ -58,8 +56,6 @@ class ConsumerAutoupdateStrategy:
                 # The -1 is to send this autoupdate as the first one to he client.
                 # Remember: the client_change_id is the change_id the client knows about
                 self.client_change_id = change_id - 1
-            if change_id > self.max_seen_change_id:
-                self.max_seen_change_id = change_id
 
             if AUTOUPDATE_DELAY is None:  # feature deactivated, send directly
                 await self.send_autoupdate()
@@ -92,17 +88,15 @@ class ConsumerAutoupdateStrategy:
             self.timer_task_handle = None
 
     async def send_autoupdate(self, in_response: Optional[str] = None) -> None:
-        # it is important to save this variable, because it can change during runtime.
-        max_change_id = self.max_seen_change_id
         # here, 1 is added to the change_id, because the client_change_id is the id the client
         # *knows* about -> the client needs client_change_id+1 since get_autoupdate_data is
         # inclusive [change_id .. max_change_id].
-        autoupdate = await get_autoupdate_data(
-            cast(int, self.client_change_id) + 1, max_change_id, self.consumer.user_id
+        max_change_id, autoupdate = await get_autoupdate_data(
+            cast(int, self.client_change_id) + 1, self.consumer.user_id
         )
         if autoupdate is not None:
-            # It will be send, so we can set the client_change_id
             self.client_change_id = max_change_id
+            # It will be send, so we can set the client_change_id
             await self.consumer.send_json(
                 type="autoupdate", content=autoupdate, in_response=in_response,
             )
diff --git a/openslides/utils/rest_api.py b/openslides/utils/rest_api.py
index e57c87e24..4cf47bd59 100644
--- a/openslides/utils/rest_api.py
+++ b/openslides/utils/rest_api.py
@@ -139,9 +139,9 @@ class ErrorLoggingMixin:
         prefix = f"{path} {user_id}"
         if isinstance(exc, APIException):
             detail = self._detail_to_string(exc.detail)
-            error_logger.warn(f"{prefix} {str(detail)}")
+            error_logger.warning(f"{prefix} {str(detail)}")
         else:
-            error_logger.warn(f"{prefix} unknown exception: {exc}")
+            error_logger.warning(f"{prefix} unknown exception: {exc}")
         return super().handle_exception(exc)  # type: ignore
 
     def _detail_to_string(self, detail: Any) -> Any:
diff --git a/tests/test_case.py b/tests/test_case.py
index 6dd7b3266..ff416fd7b 100644
--- a/tests/test_case.py
+++ b/tests/test_case.py
@@ -42,7 +42,7 @@ class TestCase(_TestCase):
         """
         user_id = None if user is None else user.id
         current_change_id = async_to_sync(element_cache.get_current_change_id)()
-        _changed_elements, deleted_element_ids = async_to_sync(
+        _, _changed_elements, deleted_element_ids = async_to_sync(
             element_cache.get_data_since
         )(user_id=user_id, change_id=current_change_id)
 
diff --git a/tests/unit/utils/test_cache.py b/tests/unit/utils/test_cache.py
index 4a47816ce..f25e9ed98 100644
--- a/tests/unit/utils/test_cache.py
+++ b/tests/unit/utils/test_cache.py
@@ -150,9 +150,14 @@ async def test_get_data_since_change_id_0(element_cache):
         "app/personalized-collection:2": '{"id": 2, "key": "value2", "user_id": 2}',
     }
 
-    result = await element_cache.get_data_since(None, 0)
+    (
+        max_change_id,
+        changed_elements,
+        deleted_element_ids,
+    ) = await element_cache.get_data_since(None, 0)
 
-    assert sort_dict(result[0]) == sort_dict(example_data())
+    assert sort_dict(changed_elements) == sort_dict(example_data())
+    assert max_change_id == 0
 
 
 @pytest.mark.asyncio
@@ -184,6 +189,7 @@ async def test_get_data_since_change_id_data_in_redis(element_cache):
     result = await element_cache.get_data_since(None, 1)
 
     assert result == (
+        1,
         {"app/collection1": [{"id": 1, "value": "value1"}]},
         ["app/collection1:3"],
     )
@@ -198,6 +204,7 @@ async def test_get_data_since_change_id_data_in_db(element_cache):
     result = await element_cache.get_data_since(None, 1)
 
     assert result == (
+        1,
         {"app/collection1": [{"id": 1, "value": "value1"}]},
         ["app/collection1:3"],
     )
@@ -207,7 +214,7 @@ async def test_get_data_since_change_id_data_in_db(element_cache):
 async def test_get_gata_since_change_id_data_in_db_empty_change_id(element_cache):
     result = await element_cache.get_data_since(None, 1)
 
-    assert result == ({}, [])
+    assert result == (0, {}, [])
 
 
 @pytest.mark.asyncio
@@ -261,9 +268,14 @@ async def test_get_all_restricted_data(element_cache):
 
 @pytest.mark.asyncio
 async def test_get_restricted_data_change_id_0(element_cache):
-    result = await element_cache.get_data_since(2, 0)
+    (
+        max_change_id,
+        changed_elements,
+        deleted_element_ids,
+    ) = await element_cache.get_data_since(2, 0)
 
-    assert sort_dict(result[0]) == sort_dict(
+    assert max_change_id == 0
+    assert sort_dict(changed_elements) == sort_dict(
         {
             "app/collection1": [
                 {"id": 1, "value": "restricted_value1"},
@@ -276,6 +288,7 @@ async def test_get_restricted_data_change_id_0(element_cache):
             "app/personalized-collection": [{"id": 2, "key": "value2", "user_id": 2}],
         }
     )
+    assert deleted_element_ids == []
 
 
 @pytest.mark.asyncio
@@ -287,6 +300,7 @@ async def test_get_restricted_data_2(element_cache):
     result = await element_cache.get_data_since(0, 1)
 
     assert result == (
+        1,
         {"app/collection1": [{"id": 1, "value": "restricted_value1"}]},
         ["app/collection1:3"],
     )
@@ -298,7 +312,7 @@ async def test_get_restricted_data_from_personalized_cacheable(element_cache):
 
     result = await element_cache.get_data_since(0, 1)
 
-    assert result == ({}, [])
+    assert result == (1, {}, [])
 
 
 @pytest.mark.asyncio
@@ -310,12 +324,13 @@ async def test_get_restricted_data_change_id_lower_than_in_redis(element_cache):
 
 
 @pytest.mark.asyncio
-async def test_get_restricted_data_change_with_id(element_cache):
+async def test_get_restricted_data_with_change_id(element_cache):
     element_cache.cache_provider.change_id_data = {2: {"app/collection1:1"}}
 
     result = await element_cache.get_data_since(0, 2)
 
     assert result == (
+        2,
         {"app/collection1": [{"id": 1, "value": "restricted_value1"}]},
         [],
     )