shared: Bump version to 0.0.16

We don't want to use the nginx 502 timeout as an API pattern. In
/mark_all_as_read we've already figured out how we want to handle this
instead.

frontend_tests/node_tests/settings_org.js

@@ -14,7 +14,6 @@ const noop = () => {};
 const realm_icon = mock_esm("../../static/js/realm_icon");
 
 const channel = mock_esm("../../static/js/channel");
-const overlays = mock_esm("../../static/js/overlays");
 
 mock_esm("../../static/js/csrf", {csrf_token: "token-stub"});
 mock_esm("../../static/js/list_widget", {
@@ -309,8 +308,6 @@ function test_extract_property_name() {
 }
 
 function test_sync_realm_settings() {
-    overlays.settings_open = () => true;
-
     {
         /* Test invalid settings property sync */
         const $property_elem = $("#id_realm_invalid_settings_property");

puppet/zulip/lib/puppet/parser/functions/zulipconf.rb

@@ -29,12 +29,10 @@ module Puppet::Parser::Functions
   newfunction(:zulipconf_nagios_hosts, :type => :rvalue, :arity => 0) do |args|
     section = "nagios"
     prefix = "hosts_"
-    ignore_key = "hosts_fullstack"
     zulip_conf_path = lookupvar("zulip_conf_path")
     keys = `/usr/bin/crudini --get #{zulip_conf_path} #{section} 2>&1`; result = $?.success?
     if result
-      keys = keys.lines.map { |l| l.strip }
+      filtered_keys = keys.lines.map { |l| l.strip }.select { |l| l.start_with?(prefix) }
-      filtered_keys = keys.select { |l| l.start_with?(prefix) }.reject { |k| k == ignore_key }
       all_values = []
       filtered_keys.each do |key|
         values = `/usr/bin/crudini --get #{zulip_conf_path} #{section} #{key} 2>&1`; result = $?.success?

puppet/zulip_ops/files/nagios_ssh_config

@@ -0,0 +1,6 @@
+Host *
+  ControlMaster no
+  ControlPath /tmp/ssh-%C
+
+  ServerAliveInterval 30
+  ServerAliveCountMax 3

puppet/zulip_ops/manifests/profile/nagios.pp

@@ -140,6 +140,14 @@ class zulip_ops::profile::nagios {
     require => File['/var/lib/nagios'],
   }
 
+  file { '/var/lib/nagios/.ssh/config':
+    ensure => file,
+    mode   => '0644',
+    owner  => 'nagios',
+    group  => 'nagios',
+    source => 'puppet:///modules/zulip_ops/nagios_ssh_config',
+  }
+
   # Disable apparmor for msmtp so it can read the above config file
   file { '/etc/apparmor.d/disable/usr.bin.msmtp':
     ensure => link,

puppet/zulip_ops/templates/nagios4/hosts.cfg.template.erb

@@ -3,7 +3,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
        hostgroups       all,fullstack,non_aws_host,frontends,not_pageable_servers,postgresql
        }
 <% end -%>
@@ -13,7 +13,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>.<%= @default_host_domain %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
        hostgroups       all,aws_host,prod_frontends,pageable_servers
        }
 <% end -%>
@@ -23,7 +23,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>.<%= @default_host_domain %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
        hostgroups       all,aws_host,staging_frontends,not_pageable_servers
        }
 <% end -%>
@@ -33,7 +33,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>.<%= @default_host_domain %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
        hostgroups       all,non_aws_host,zmirror,flaky_servers
        }
 <% end -%>
@@ -43,7 +43,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>.<%= @default_host_domain %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
        hostgroups       all,non_aws_host,zmirrorp,flaky_servers
        }
 <% end -%>
@@ -53,7 +53,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>.<%= @default_host_domain %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
        hostgroups       all,aws_host,postgresql_primary,pageable_servers
        }
 <% end -%>
@@ -63,7 +63,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>.<%= @default_host_domain %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
        hostgroups       all,aws_host,postgresql_replica,pageable_servers
        }
 <% end -%>
@@ -73,7 +73,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>.<%= @default_host_domain %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
        hostgroups       all,aws_host,not_pageable_servers, redis
        }
 <% end -%>
@@ -83,7 +83,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>.<%= @default_host_domain %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
        hostgroups       all,aws_host,pageable_servers,smokescreen
        }
 <% end -%>
@@ -93,7 +93,7 @@ define host{
        use              generic-host
        host_name        <%= host %>
        alias            <%= host %>
-       address          <%= host %>.<%= @default_host_domain %>
+       address          <%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
-       hostgroups       all,aws_host,not_pageable_servers,other
+       hostgroups       all,<% if host.include?(".") %>non_<% end %>aws_host,not_pageable_servers,other
        }
 <% end -%>

puppet/zulip_ops/templates/supervisor/conf.d/munin_tunnels.conf.erb

@@ -4,8 +4,8 @@
 i = 0
 @hosts.each do |host|
 -%>
-[program:munin-tunnel-<%= host %>]
+[program:autossh-tunnel-<%= host %>]
-command=autossh -2 -N -M <%= 20000 + 2 * i %> -L <%= 5000 + i %>:localhost:4949 nagios@<%= host %>.<%= @default_host_domain %>
+command=autossh -N -M <%= 20000 + 2 * i %> -L <%= 5000 + i %>:localhost:4949 -o ControlMaster=yes nagios@<%= host %><% unless host.include?(".") %>.<%= @default_host_domain %><% end %>
 priority=200                   ; the relative start priority (default 999)
 autostart=true                 ; start at supervisord start (default: true)
 autorestart=true               ; whether/when to restart (default: unexpected)

static/js/message_edit.js

@@ -976,13 +976,14 @@ export function delete_topic(stream_id, topic_name, failures = 0) {
         data: {
             topic_name,
         },
-        success() {},
+        success(data) {
-        error(xhr) {
+            if (data.result === "partially_completed") {
                 if (failures >= 9) {
                     // Don't keep retrying indefinitely to avoid DoSing the server.
                     return;
                 }
-            if (xhr.status === 502) {
+
+                failures += 1;
                 /* When trying to delete a very large topic, it's
                    possible for the request to the server to
                    time out after making some progress. Retry the
@@ -991,7 +992,6 @@ export function delete_topic(stream_id, topic_name, failures = 0) {
 
                    TODO: Show a nice loading indicator experience.
                 */
-                failures += 1;
                 delete_topic(stream_id, topic_name, failures);
             }
         },

static/js/popovers.js

@@ -50,6 +50,7 @@ import * as settings_bots from "./settings_bots";
 import * as settings_config from "./settings_config";
 import * as settings_data from "./settings_data";
 import * as settings_users from "./settings_users";
+import * as stream_data from "./stream_data";
 import * as stream_popover from "./stream_popover";
 import * as ui_report from "./ui_report";
 import * as unread_ops from "./unread_ops";
@@ -559,18 +560,32 @@ export function toggle_actions_popover(element, id) {
             view_source_menu_item = $t({defaultMessage: "View message source"});
         }
 
-        // Theoretically, it could be useful to offer this even for a
+        // We do not offer "Mark as unread" on messages in streams
-        // message that is already unread, so you can mark those below
+        // that the user is not currently subscribed to. Zulip has an
-        // it as unread; but that's an unlikely situation, and showing
+        // invariant that all unread messages must be in streams the
-        // it can be a confusing source of clutter.
+        // user is subscribed to, and so the server will ignore any
+        // messages in such streams; it's better to hint this is not
+        // useful by not offering the option.
+        //
+        // We also require that the message is currently marked as
+        // read. Theoretically, it could be useful to offer this even
+        // for a message that is already unread, so you can mark those
+        // below it as unread; but that's an unlikely situation, and
+        // showing it can be a confusing source of clutter. We may
+        // want to revise this algorithm specifically in the context
+        // of interleaved views.
         //
         // To work around #22893, we also only offer the option if the
         // fetch_status data structure means we'll be able to mark
         // everything below the current message as read correctly.
+        const not_stream_message = message.type !== "stream";
+        const subscribed_to_stream =
+            message.type === "stream" && stream_data.is_subscribed(message.stream_id);
         const should_display_mark_as_unread =
             message_lists.current.data.fetch_status.has_found_newest() &&
             !message.unread &&
-            not_spectator;
+            not_spectator &&
+            (not_stream_message || subscribed_to_stream);
 
         const should_display_edit_history_option =
             message.edit_history &&

static/js/settings_org.js

@@ -11,7 +11,6 @@ import {csrf_token} from "./csrf";
 import {DropdownListWidget} from "./dropdown_list_widget";
 import {$t, $t_html, get_language_name} from "./i18n";
 import * as loading from "./loading";
-import * as overlays from "./overlays";
 import {page_params} from "./page_params";
 import * as realm_icon from "./realm_icon";
 import * as realm_logo from "./realm_logo";
@@ -590,7 +589,7 @@ function discard_property_element_changes(elem, for_realm_default_settings) {
 }
 
 export function sync_realm_settings(property) {
-    if (!overlays.settings_open()) {
+    if (!meta.loaded) {
         return;
     }
 

static/js/unread.js

@@ -42,29 +42,6 @@ const unread_messages = new Set();
 // for how we can refresh it efficiently.
 export const unread_mention_topics = new Map();
 
-function add_message_to_unread_mention_topics(message_id) {
-    const message = message_store.get(message_id);
-    if (message.type !== "stream") {
-        return;
-    }
-    const topic_key = recent_topics_util.get_topic_key(message.stream_id, message.topic);
-    if (unread_mention_topics.has(topic_key)) {
-        unread_mention_topics.get(topic_key).add(message_id);
-    }
-    unread_mention_topics.set(topic_key, new Set([message_id]));
-}
-
-function remove_message_from_unread_mention_topics(message_id) {
-    const message = message_store.get(message_id);
-    if (message.type !== "stream") {
-        return;
-    }
-    const topic_key = recent_topics_util.get_topic_key(message.stream_id, message.topic);
-    if (unread_mention_topics.has(topic_key)) {
-        unread_mention_topics.get(topic_key).delete(message_id);
-    }
-}
-
 class Bucketer {
     // Maps item_id => bucket_key for items present in a bucket.
     reverse_lookup = new Map();
@@ -468,6 +445,39 @@ class UnreadTopicCounter {
 }
 const unread_topic_counter = new UnreadTopicCounter();
 
+function add_message_to_unread_mention_topics(message_id) {
+    const message = message_store.get(message_id);
+    if (message.type !== "stream") {
+        return;
+    }
+    const topic_key = recent_topics_util.get_topic_key(message.stream_id, message.topic);
+    if (unread_mention_topics.has(topic_key)) {
+        unread_mention_topics.get(topic_key).add(message_id);
+    }
+    unread_mention_topics.set(topic_key, new Set([message_id]));
+}
+
+function remove_message_from_unread_mention_topics(message_id) {
+    const stream_id = unread_topic_counter.bucketer.reverse_lookup.get(message_id);
+    if (!stream_id) {
+        // Private messages and messages that were already not unread
+        // exit here.
+        return;
+    }
+
+    const per_stream_bucketer = unread_topic_counter.bucketer.get_bucket(stream_id);
+    if (!per_stream_bucketer) {
+        blueslip.error(`Could not find per_stream_bucketer for ${message_id}.`);
+        return;
+    }
+
+    const topic = per_stream_bucketer.reverse_lookup.get(message_id);
+    const topic_key = recent_topics_util.get_topic_key(stream_id, topic);
+    if (unread_mention_topics.has(topic_key)) {
+        unread_mention_topics.get(topic_key).delete(message_id);
+    }
+}
+
 export function clear_and_populate_unread_mention_topics() {
     // The unread_mention_topics is an important data structure for
     // efficiently querying whether a given stream/topic pair contains
@@ -565,9 +575,7 @@ export function process_loaded_messages(messages, expect_no_new_unreads = false)
                 // to a view and the message_fetch request returns
                 // before server_events system delivers the message to
                 // the client.
-                //
+                blueslip.log(`New unread ${message.id} discovered in process_loaded_messages.`);
-                // For now, log it as a blueslip error so we can learn its prevalence.
-                blueslip.error("New unread discovered in process_loaded_messages.");
             }
 
             const user_ids_string =
@@ -648,10 +656,14 @@ export function mark_as_read(message_id) {
     // the following methods are cheap and work fine even if message_id
     // was never set to unread.
     unread_pm_counter.delete(message_id);
+
+    // Important: This function uses `unread_topic_counter` to look up
+    // the stream/topic for this previously unread message, so much
+    // happen before the message is removed from that data structure.
+    remove_message_from_unread_mention_topics(message_id);
     unread_topic_counter.delete(message_id);
     unread_mentions_counter.delete(message_id);
     unread_messages.delete(message_id);
-    remove_message_from_unread_mention_topics(message_id);
 
     const message = message_store.get(message_id);
     if (message) {

static/shared/js/typeahead.js.flow

@@ -1,6 +1,11 @@
 // @flow strict
 
-export type Emoji = {emoji_name: string, emoji_code: string, ...};
+export type Emoji = {
+    emoji_name: string,
+    emoji_code: string,
+    reaction_type: "unicode_emoji" | "realm_emoji" | "zulip_extra_emoji",
+    ...
+};
 
 // declare export var popular_emojis
 

static/shared/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@zulip/shared",
-  "version": "0.0.15",
+  "version": "0.0.16",
   "license": "Apache-2.0",
   "scripts": {
     "version": "tools/npm-version",

static/shared/tools/npm-postversion

@@ -23,7 +23,7 @@ Next steps:
 
   \$ ${bold}git log --stat -p upstream..${reset}  # check your work!
 
-  \$ ${bold}git push upstream main shared-${npm_package_version}${reset}
+  \$ ${bold}git push --atomic upstream main shared-${npm_package_version}${reset}
 
   \$ ${bold}npm publish${reset}  # should prompt for an OTP, from your 2FA setup
 "

static/templates/gear_menu.hbs

@@ -26,7 +26,7 @@
                     {{else if is_plan_standard}}
                         <a href="/plans" target="_blank" rel="noopener noreferrer" role="menuitem">Zulip Cloud Standard</a>
                     {{else if is_plan_standard_sponsored_for_free}}
-                        <a href="/plans" target="_blank" rel="noopener noreferrer" role="menuitem">Zulip Cloud Standard, sponsored for free</a>
+                        <a href="/plans" target="_blank" rel="noopener noreferrer" role="menuitem">Zulip Cloud Standard (sponsored)</a>
                     {{/if}}
                 </li>
             {{/if}}

templates/zerver/api/changelog.md

@@ -20,6 +20,13 @@ format used by the Zulip server that they are interacting with.
 
 ## Changes in Zulip 6.0
 
+**Feature level 154**
+
+* [`POST /streams/{stream_id}/delete_topic`](/api/delete-topic):
+  When the process of deleting messages times out, a success response
+  with "partially_completed" result will now be returned by the server,
+  analogically to the `/mark_all_as_read` endpoint.
+
 **Feature level 153**
 
 * [`POST /mark_all_as_read`](/api/mark-all-as-read): Messages are now

version.py

@@ -33,7 +33,7 @@ DESKTOP_WARNING_VERSION = "5.4.3"
 # Changes should be accompanied by documentation explaining what the
 # new level means in templates/zerver/api/changelog.md, as well as
 # "**Changes**" entries in the endpoint's documentation in `zulip.yaml`.
-API_FEATURE_LEVEL = 153
+API_FEATURE_LEVEL = 154
 
 # Bump the minor PROVISION_VERSION to indicate that folks should provision
 # only when going from an old version of the code to a newer version. Bump

zerver/lib/test_helpers.py

@@ -717,3 +717,15 @@ def mock_queue_publish(
 
     with mock.patch(method_to_patch, side_effect=verify_serialize):
         yield inner
+
+
+@contextmanager
+def timeout_mock(mock_path: str) -> Iterator[None]:
+    # timeout() doesn't work in test environment with database operations
+    # and they don't get committed - so we need to replace it with a mock
+    # that just calls the function.
+    def mock_timeout(seconds: int, func: Callable[[], object]) -> object:
+        return func()
+
+    with mock.patch(f"{mock_path}.timeout", new=mock_timeout):
+        yield

zerver/openapi/zulip.yaml

@@ -14388,6 +14388,9 @@ paths:
         for very large topics. It now deletes messages in batches,
         starting with the newest messages, so that progress will be
         made even if the request times out.
+
+        As of feature level 154, in case of timeout, a success response
+        with "partially_completed" result will now be returned.
       parameters:
         - $ref: "#/components/parameters/StreamIdInPath"
         - name: topic_name
@@ -14400,7 +14403,26 @@ paths:
           required: true
       responses:
         "200":
-          $ref: "#/components/responses/SimpleSuccess"
+          description: Success or partial success.
+          content:
+            application/json:
+              schema:
+                oneOf:
+                  - allOf:
+                      - $ref: "#/components/schemas/JsonSuccess"
+                      - $ref: "#/components/schemas/SuccessDescription"
+                  - allOf:
+                      - $ref: "#/components/schemas/PartiallyCompleted"
+                      - example:
+                          {
+                            "code": "REQUEST_TIMEOUT",
+                            "msg": "",
+                            "result": "partially_completed",
+                          }
+                        description: |
+                          If the request exceeds its processing time limit after having
+                          successfully marked some messages as read, response code 200
+                          with result "partially_completed" and code "REQUEST_TIMEOUT" will be returned like this:
         "400":
           description: Bad request.
           content:

zerver/tests/test_message_flags.py

@@ -1,5 +1,4 @@
-from contextlib import contextmanager
+from typing import TYPE_CHECKING, Any, List, Mapping, Set
-from typing import TYPE_CHECKING, Any, Callable, Iterator, List, Mapping, Set
 from unittest import mock
 
 import orjson
@@ -22,7 +21,7 @@ from zerver.lib.message import (
     get_raw_unread_data,
 )
 from zerver.lib.test_classes import ZulipTestCase
-from zerver.lib.test_helpers import get_subscription
+from zerver.lib.test_helpers import get_subscription, timeout_mock
 from zerver.lib.timeout import TimeoutExpired
 from zerver.lib.user_topics import add_topic_mute
 from zerver.models import (
@@ -51,18 +50,6 @@ def check_flags(flags: List[str], expected: Set[str]) -> None:
         raise AssertionError(f"expected flags (ignoring has_alert_word) to be {expected}")
 
 
-@contextmanager
-def timeout_mock() -> Iterator[None]:
-    # timeout() doesn't work in test environment with database operations
-    # and they don't get committed - so we need to replace it with a mock
-    # that just calls the function.
-    def mock_timeout(seconds: int, func: Callable[[], object]) -> object:
-        return func()
-
-    with mock.patch("zerver.views.message_flags.timeout", new=mock_timeout):
-        yield
-
-
 class FirstUnreadAnchorTests(ZulipTestCase):
     """
     HISTORICAL NOTE:
@@ -76,7 +63,7 @@ class FirstUnreadAnchorTests(ZulipTestCase):
         self.login("hamlet")
 
         # Mark all existing messages as read
-        with timeout_mock():
+        with timeout_mock("zerver.views.message_flags"):
             result = self.client_post("/json/mark_all_as_read")
         self.assert_json_success(result)
 
@@ -136,7 +123,7 @@ class FirstUnreadAnchorTests(ZulipTestCase):
     def test_visible_messages_use_first_unread_anchor(self) -> None:
         self.login("hamlet")
 
-        with timeout_mock():
+        with timeout_mock("zerver.views.message_flags"):
             result = self.client_post("/json/mark_all_as_read")
         self.assert_json_success(result)
 
@@ -579,7 +566,7 @@ class PushNotificationMarkReadFlowsTest(ZulipTestCase):
             [third_message_id, fourth_message_id],
         )
 
-        with timeout_mock():
+        with timeout_mock("zerver.views.message_flags"):
             result = self.client_post("/json/mark_all_as_read", {})
         self.assertEqual(self.get_mobile_push_notification_ids(user_profile), [])
         mock_push_notifications.assert_called()
@@ -602,7 +589,7 @@ class MarkAllAsReadEndpointTest(ZulipTestCase):
             .count()
         )
         self.assertNotEqual(unread_count, 0)
-        with timeout_mock():
+        with timeout_mock("zerver.views.message_flags"):
             result = self.client_post("/json/mark_all_as_read", {})
         self.assert_json_success(result)
 

zerver/tests/test_message_topics.py

@@ -1,7 +1,12 @@
+from unittest import mock
+
+import orjson
 from django.utils.timezone import now as timezone_now
 
 from zerver.actions.streams import do_change_stream_permission
 from zerver.lib.test_classes import ZulipTestCase
+from zerver.lib.test_helpers import timeout_mock
+from zerver.lib.timeout import TimeoutExpired
 from zerver.models import Message, UserMessage, get_client, get_realm, get_stream
 
 
@@ -282,6 +287,7 @@ class TopicDeleteTest(ZulipTestCase):
             acting_user=user_profile,
         )
         # Delete the topic should now remove all messages
+        with timeout_mock("zerver.views.streams"):
             result = self.client_post(
                 endpoint,
                 {
@@ -293,6 +299,7 @@ class TopicDeleteTest(ZulipTestCase):
         self.assertTrue(Message.objects.filter(id=initial_last_msg_id).exists())
 
         # Delete again, to test the edge case of deleting an empty topic.
+        with timeout_mock("zerver.views.streams"):
             result = self.client_post(
                 endpoint,
                 {
@@ -302,3 +309,29 @@ class TopicDeleteTest(ZulipTestCase):
         self.assert_json_success(result)
         self.assertFalse(Message.objects.filter(id=last_msg_id).exists())
         self.assertTrue(Message.objects.filter(id=initial_last_msg_id).exists())
+
+    def test_topic_delete_timeout(self) -> None:
+        stream_name = "new_stream"
+        topic_name = "new topic 2"
+
+        user_profile = self.example_user("iago")
+        self.subscribe(user_profile, stream_name)
+
+        stream = get_stream(stream_name, user_profile.realm)
+        self.send_stream_message(user_profile, stream_name, topic_name=topic_name)
+
+        self.login_user(user_profile)
+        endpoint = "/json/streams/" + str(stream.id) + "/delete_topic"
+        with mock.patch("zerver.views.streams.timeout", side_effect=TimeoutExpired):
+            result = self.client_post(
+                endpoint,
+                {
+                    "topic_name": topic_name,
+                },
+            )
+            self.assertEqual(result.status_code, 200)
+
+            result_dict = orjson.loads(result.content)
+            self.assertEqual(
+                result_dict, {"result": "partially_completed", "msg": "", "code": "REQUEST_TIMEOUT"}
+            )

zerver/views/streams.py

@@ -1,5 +1,5 @@
 from collections import defaultdict
-from typing import Any, Callable, Dict, List, Mapping, Optional, Sequence, Set, Union
+from typing import Any, Callable, Dict, List, Literal, Mapping, Optional, Sequence, Set, Union
 
 import orjson
 from django.conf import settings
@@ -54,7 +54,7 @@ from zerver.lib.exceptions import (
 )
 from zerver.lib.mention import MentionBackend, silent_mention_syntax_for_user
 from zerver.lib.request import REQ, has_request_variables
-from zerver.lib.response import json_success
+from zerver.lib.response import json_partial_success, json_success
 from zerver.lib.retention import STREAM_MESSAGE_BATCH_SIZE as RETENTION_STREAM_MESSAGE_BATCH_SIZE
 from zerver.lib.retention import parse_message_retention_days
 from zerver.lib.streams import (
@@ -72,6 +72,7 @@ from zerver.lib.streams import (
 )
 from zerver.lib.string_validation import check_stream_name
 from zerver.lib.subscription_info import gather_subscriptions
+from zerver.lib.timeout import TimeoutExpired, timeout
 from zerver.lib.topic import (
     get_topic_history_for_public_stream,
     get_topic_history_for_stream,
@@ -867,6 +868,7 @@ def delete_in_topic(
         ).values_list("message_id", flat=True)
         messages = messages.filter(id__in=deletable_message_ids)
 
+    def delete_in_batches() -> Literal[True]:
         # Topics can be large enough that this request will inevitably time out.
         # In such a case, it's good for some progress to be accomplished, so that
         # full deletion can be achieved by repeating the request. For that purpose,
@@ -882,6 +884,14 @@ def delete_in_topic(
                     break
                 do_delete_messages(user_profile.realm, messages_to_delete)
 
+        # timeout() in which we call this function requires non-None return value.
+        return True
+
+    try:
+        timeout(50, delete_in_batches)
+    except TimeoutExpired:
+        return json_partial_success(request, data={"code": ErrorCode.REQUEST_TIMEOUT.name})
+
     return json_success(request)