zulip/zerver/tests/test_event_system.py

import time
from typing import Any, Callable, Dict, List
from unittest import mock

import orjson
from django.conf import settings
from django.http import HttpRequest, HttpResponse

from zerver.lib.actions import check_send_message, do_change_user_role, do_set_realm_property
from zerver.lib.event_schema import check_restart_event
from zerver.lib.events import fetch_initial_state_data, get_raw_user_data
from zerver.lib.test_classes import ZulipTestCase
from zerver.lib.test_helpers import HostRequestMock, queries_captured, stub_event_queue_user_events
from zerver.lib.users import get_api_key
from zerver.models import (
    Realm,
    UserMessage,
    UserProfile,
    flush_per_request_caches,
    get_client,
    get_realm,
    get_stream,
    get_system_bot,
)
from zerver.tornado.event_queue import (
    allocate_client_descriptor,
    clear_client_event_queues_for_testing,
    get_client_info_for_message_event,
    process_message_event,
    send_restart_events,
)
from zerver.tornado.views import get_events
from zerver.views.events_register import _default_all_public_streams, _default_narrow


class EventsEndpointTest(ZulipTestCase):
    def test_events_register_endpoint(self) -> None:

        # This test is intended to get minimal coverage on the
        # events_register code paths
        user = self.example_user("hamlet")
        with mock.patch("zerver.views.events_register.do_events_register", return_value={}):
            result = self.api_post(user, "/json/register")
        self.assert_json_success(result)

        with mock.patch("zerver.lib.events.request_event_queue", return_value=None):
            result = self.api_post(user, "/json/register")
        self.assert_json_error(result, "Could not allocate event queue")

        return_event_queue = "15:11"
        return_user_events: List[Dict[str, Any]] = []

        # We choose realm_emoji somewhat randomly--we want
        # a "boring" event type for the purpose of this test.
        event_type = "realm_emoji"
        test_event = dict(id=6, type=event_type, realm_emoji=[])

        # Test that call is made to deal with a returning soft deactivated user.
        with mock.patch("zerver.lib.events.reactivate_user_if_soft_deactivated") as fa:
            with stub_event_queue_user_events(return_event_queue, return_user_events):
                result = self.api_post(
                    user, "/json/register", dict(event_types=orjson.dumps([event_type]).decode())
                )
                self.assertEqual(fa.call_count, 1)

        with stub_event_queue_user_events(return_event_queue, return_user_events):
            result = self.api_post(
                user, "/json/register", dict(event_types=orjson.dumps([event_type]).decode())
            )

        self.assert_json_success(result)
        result_dict = result.json()
        self.assertEqual(result_dict["last_event_id"], -1)
        self.assertEqual(result_dict["queue_id"], "15:11")

        # Now start simulating returning actual data
        return_event_queue = "15:12"
        return_user_events = [test_event]

        with stub_event_queue_user_events(return_event_queue, return_user_events):
            result = self.api_post(
                user, "/json/register", dict(event_types=orjson.dumps([event_type]).decode())
            )

        self.assert_json_success(result)
        result_dict = result.json()
        self.assertEqual(result_dict["last_event_id"], 6)
        self.assertEqual(result_dict["queue_id"], "15:12")

        # sanity check the data relevant to our event
        self.assertEqual(result_dict["realm_emoji"], [])

        # Now test with `fetch_event_types` not matching the event
        return_event_queue = "15:13"
        with stub_event_queue_user_events(return_event_queue, return_user_events):
            result = self.api_post(
                user,
                "/json/register",
                dict(
                    event_types=orjson.dumps([event_type]).decode(),
                    fetch_event_types=orjson.dumps(["message"]).decode(),
                ),
            )
        self.assert_json_success(result)
        result_dict = result.json()
        self.assertEqual(result_dict["last_event_id"], 6)
        # Check that the message event types data is in there
        self.assertIn("max_message_id", result_dict)

        # Check that our original event type is not there.
        self.assertNotIn(event_type, result_dict)
        self.assertEqual(result_dict["queue_id"], "15:13")

        # Now test with `fetch_event_types` matching the event
        with stub_event_queue_user_events(return_event_queue, return_user_events):
            result = self.api_post(
                user,
                "/json/register",
                dict(
                    fetch_event_types=orjson.dumps([event_type]).decode(),
                    event_types=orjson.dumps(["message"]).decode(),
                ),
            )
        self.assert_json_success(result)
        result_dict = result.json()
        self.assertEqual(result_dict["last_event_id"], 6)
        # Check that we didn't fetch the messages data
        self.assertNotIn("max_message_id", result_dict)

        # Check that the realm_emoji data is in there.
        self.assertIn("realm_emoji", result_dict)
        self.assertEqual(result_dict["realm_emoji"], [])
        self.assertEqual(result_dict["queue_id"], "15:13")

    def test_tornado_endpoint(self) -> None:

        # This test is mostly intended to get minimal coverage on
        # the /notify_tornado endpoint, so we can have 100% URL coverage,
        # but it does exercise a little bit of the codepath.
        post_data = dict(
            data=orjson.dumps(
                dict(
                    event=dict(
                        type="other",
                    ),
                    users=[self.example_user("hamlet").id],
                ),
            ).decode(),
        )
        req = HostRequestMock(post_data, user_profile=None)
        req.META["REMOTE_ADDR"] = "127.0.0.1"
        result = self.client_post_request("/notify_tornado", req)
        self.assert_json_error(result, "Access denied", status_code=403)

        post_data["secret"] = settings.SHARED_SECRET
        req = HostRequestMock(post_data, user_profile=None)
        req.META["REMOTE_ADDR"] = "127.0.0.1"
        result = self.client_post_request("/notify_tornado", req)
        self.assert_json_success(result)


class GetEventsTest(ZulipTestCase):
    def tornado_call(
        self,
        view_func: Callable[[HttpRequest, UserProfile], HttpResponse],
        user_profile: UserProfile,
        post_data: Dict[str, Any],
    ) -> HttpResponse:
        request = HostRequestMock(post_data, user_profile)
        return view_func(request, user_profile)

    def test_get_events(self) -> None:
        user_profile = self.example_user("hamlet")
        email = user_profile.email
        recipient_user_profile = self.example_user("othello")
        recipient_email = recipient_user_profile.email
        self.login_user(user_profile)

        result = self.tornado_call(
            get_events,
            user_profile,
            {
                "apply_markdown": orjson.dumps(True).decode(),
                "client_gravatar": orjson.dumps(True).decode(),
                "event_types": orjson.dumps(["message"]).decode(),
                "user_client": "website",
                "dont_block": orjson.dumps(True).decode(),
            },
        )
        self.assert_json_success(result)
        queue_id = orjson.loads(result.content)["queue_id"]

        recipient_result = self.tornado_call(
            get_events,
            recipient_user_profile,
            {
                "apply_markdown": orjson.dumps(True).decode(),
                "client_gravatar": orjson.dumps(True).decode(),
                "event_types": orjson.dumps(["message"]).decode(),
                "user_client": "website",
                "dont_block": orjson.dumps(True).decode(),
            },
        )
        self.assert_json_success(recipient_result)
        recipient_queue_id = orjson.loads(recipient_result.content)["queue_id"]

        result = self.tornado_call(
            get_events,
            user_profile,
            {
                "queue_id": queue_id,
                "user_client": "website",
                "last_event_id": -1,
                "dont_block": orjson.dumps(True).decode(),
            },
        )
        events = orjson.loads(result.content)["events"]
        self.assert_json_success(result)
        self.assert_length(events, 0)

        local_id = "10.01"
        check_send_message(
            sender=user_profile,
            client=get_client("whatever"),
            message_type_name="private",
            message_to=[recipient_email],
            topic_name=None,
            message_content="hello",
            local_id=local_id,
            sender_queue_id=queue_id,
        )

        result = self.tornado_call(
            get_events,
            user_profile,
            {
                "queue_id": queue_id,
                "user_client": "website",
                "last_event_id": -1,
                "dont_block": orjson.dumps(True).decode(),
            },
        )
        events = orjson.loads(result.content)["events"]
        self.assert_json_success(result)
        self.assert_length(events, 1)
        self.assertEqual(events[0]["type"], "message")
        self.assertEqual(events[0]["message"]["sender_email"], email)
        self.assertEqual(events[0]["local_message_id"], local_id)
        self.assertEqual(events[0]["message"]["display_recipient"][0]["is_mirror_dummy"], False)
        self.assertEqual(events[0]["message"]["display_recipient"][1]["is_mirror_dummy"], False)

        last_event_id = events[0]["id"]
        local_id = "10.02"

        check_send_message(
            sender=user_profile,
            client=get_client("whatever"),
            message_type_name="private",
            message_to=[recipient_email],
            topic_name=None,
            message_content="hello",
            local_id=local_id,
            sender_queue_id=queue_id,
        )

        result = self.tornado_call(
            get_events,
            user_profile,
            {
                "queue_id": queue_id,
                "user_client": "website",
                "last_event_id": last_event_id,
                "dont_block": orjson.dumps(True).decode(),
            },
        )
        events = orjson.loads(result.content)["events"]
        self.assert_json_success(result)
        self.assert_length(events, 1)
        self.assertEqual(events[0]["type"], "message")
        self.assertEqual(events[0]["message"]["sender_email"], email)
        self.assertEqual(events[0]["local_message_id"], local_id)

        # Test that the received message in the receiver's event queue
        # exists and does not contain a local id
        recipient_result = self.tornado_call(
            get_events,
            recipient_user_profile,
            {
                "queue_id": recipient_queue_id,
                "user_client": "website",
                "last_event_id": -1,
                "dont_block": orjson.dumps(True).decode(),
            },
        )
        recipient_events = orjson.loads(recipient_result.content)["events"]
        self.assert_json_success(recipient_result)
        self.assertEqual(len(recipient_events), 2)
        self.assertEqual(recipient_events[0]["type"], "message")
        self.assertEqual(recipient_events[0]["message"]["sender_email"], email)
        self.assertTrue("local_message_id" not in recipient_events[0])
        self.assertEqual(recipient_events[1]["type"], "message")
        self.assertEqual(recipient_events[1]["message"]["sender_email"], email)
        self.assertTrue("local_message_id" not in recipient_events[1])

    def test_get_events_narrow(self) -> None:
        user_profile = self.example_user("hamlet")
        self.login_user(user_profile)

        def get_message(apply_markdown: bool, client_gravatar: bool) -> Dict[str, Any]:
            result = self.tornado_call(
                get_events,
                user_profile,
                dict(
                    apply_markdown=orjson.dumps(apply_markdown).decode(),
                    client_gravatar=orjson.dumps(client_gravatar).decode(),
                    event_types=orjson.dumps(["message"]).decode(),
                    narrow=orjson.dumps([["stream", "denmark"]]).decode(),
                    user_client="website",
                    dont_block=orjson.dumps(True).decode(),
                ),
            )

            self.assert_json_success(result)
            queue_id = orjson.loads(result.content)["queue_id"]

            result = self.tornado_call(
                get_events,
                user_profile,
                {
                    "queue_id": queue_id,
                    "user_client": "website",
                    "last_event_id": -1,
                    "dont_block": orjson.dumps(True).decode(),
                },
            )
            events = orjson.loads(result.content)["events"]
            self.assert_json_success(result)
            self.assert_length(events, 0)

            self.send_personal_message(user_profile, self.example_user("othello"), "hello")
            self.send_stream_message(user_profile, "Denmark", "**hello**")

            result = self.tornado_call(
                get_events,
                user_profile,
                {
                    "queue_id": queue_id,
                    "user_client": "website",
                    "last_event_id": -1,
                    "dont_block": orjson.dumps(True).decode(),
                },
            )
            events = orjson.loads(result.content)["events"]
            self.assert_json_success(result)
            self.assert_length(events, 1)
            self.assertEqual(events[0]["type"], "message")
            return events[0]["message"]

        message = get_message(apply_markdown=False, client_gravatar=False)
        self.assertEqual(message["display_recipient"], "Denmark")
        self.assertEqual(message["content"], "**hello**")
        self.assertTrue(message["avatar_url"].startswith("https://secure.gravatar.com"))

        message = get_message(apply_markdown=True, client_gravatar=False)
        self.assertEqual(message["display_recipient"], "Denmark")
        self.assertEqual(message["content"], "<p><strong>hello</strong></p>")
        self.assertIn("gravatar.com", message["avatar_url"])

        message = get_message(apply_markdown=False, client_gravatar=True)
        self.assertEqual(message["display_recipient"], "Denmark")
        self.assertEqual(message["content"], "**hello**")
        self.assertEqual(message["avatar_url"], None)

        message = get_message(apply_markdown=True, client_gravatar=True)
        self.assertEqual(message["display_recipient"], "Denmark")
        self.assertEqual(message["content"], "<p><strong>hello</strong></p>")
        self.assertEqual(message["avatar_url"], None)


class FetchInitialStateDataTest(ZulipTestCase):
    # Non-admin users don't have access to all bots
    def test_realm_bots_non_admin(self) -> None:
        user_profile = self.example_user("cordelia")
        self.assertFalse(user_profile.is_realm_admin)
        result = fetch_initial_state_data(user_profile)
        self.assert_length(result["realm_bots"], 0)

        # additionally the API key for a random bot is not present in the data
        api_key = get_api_key(self.notification_bot())
        self.assertNotIn(api_key, str(result))

    # Admin users have access to all bots in the realm_bots field
    def test_realm_bots_admin(self) -> None:
        user_profile = self.example_user("hamlet")
        do_change_user_role(user_profile, UserProfile.ROLE_REALM_ADMINISTRATOR, acting_user=None)
        self.assertTrue(user_profile.is_realm_admin)
        result = fetch_initial_state_data(user_profile)
        self.assertTrue(len(result["realm_bots"]) > 2)

    def test_max_message_id_with_no_history(self) -> None:
        user_profile = self.example_user("aaron")
        # Delete all historical messages for this user
        UserMessage.objects.filter(user_profile=user_profile).delete()
        result = fetch_initial_state_data(user_profile)
        self.assertEqual(result["max_message_id"], -1)

    def test_delivery_email_presence_for_non_admins(self) -> None:
        user_profile = self.example_user("aaron")
        self.assertFalse(user_profile.is_realm_admin)

        do_set_realm_property(
            user_profile.realm,
            "email_address_visibility",
            Realm.EMAIL_ADDRESS_VISIBILITY_EVERYONE,
            acting_user=None,
        )
        result = fetch_initial_state_data(user_profile)

        for key, value in result["raw_users"].items():
            self.assertNotIn("delivery_email", value)

        do_set_realm_property(
            user_profile.realm,
            "email_address_visibility",
            Realm.EMAIL_ADDRESS_VISIBILITY_ADMINS,
            acting_user=None,
        )
        result = fetch_initial_state_data(user_profile)

        for key, value in result["raw_users"].items():
            self.assertNotIn("delivery_email", value)

    def test_delivery_email_presence_for_admins(self) -> None:
        user_profile = self.example_user("iago")
        self.assertTrue(user_profile.is_realm_admin)

        do_set_realm_property(
            user_profile.realm,
            "email_address_visibility",
            Realm.EMAIL_ADDRESS_VISIBILITY_EVERYONE,
            acting_user=None,
        )
        result = fetch_initial_state_data(user_profile)
        for key, value in result["raw_users"].items():
            self.assertNotIn("delivery_email", value)

        do_set_realm_property(
            user_profile.realm,
            "email_address_visibility",
            Realm.EMAIL_ADDRESS_VISIBILITY_ADMINS,
            acting_user=None,
        )
        result = fetch_initial_state_data(user_profile)
        for key, value in result["raw_users"].items():
            self.assertIn("delivery_email", value)

    def test_user_avatar_url_field_optional(self) -> None:
        hamlet = self.example_user("hamlet")
        users = [
            self.example_user("iago"),
            self.example_user("cordelia"),
            self.example_user("ZOE"),
            self.example_user("othello"),
        ]

        for user in users:
            user.long_term_idle = True
            user.save()

        long_term_idle_users_ids = [user.id for user in users]

        result = fetch_initial_state_data(
            user_profile=hamlet,
            user_avatar_url_field_optional=True,
        )

        raw_users = result["raw_users"]

        for user_dict in raw_users.values():
            if user_dict["user_id"] in long_term_idle_users_ids:
                self.assertFalse("avatar_url" in user_dict)
            else:
                self.assertIsNotNone(user_dict["avatar_url"])

        gravatar_users_id = [
            user_dict["user_id"]
            for user_dict in raw_users.values()
            if "avatar_url" in user_dict and "gravatar.com" in user_dict["avatar_url"]
        ]

        # Test again with client_gravatar = True
        result = fetch_initial_state_data(
            user_profile=hamlet,
            client_gravatar=True,
            user_avatar_url_field_optional=True,
        )

        raw_users = result["raw_users"]

        for user_dict in raw_users.values():
            if user_dict["user_id"] in gravatar_users_id:
                self.assertIsNone(user_dict["avatar_url"])
            else:
                self.assertFalse("avatar_url" in user_dict)


class ClientDescriptorsTest(ZulipTestCase):
    def test_get_client_info_for_all_public_streams(self) -> None:
        hamlet = self.example_user("hamlet")
        realm = hamlet.realm

        queue_data = dict(
            all_public_streams=True,
            apply_markdown=True,
            client_gravatar=True,
            client_type_name="website",
            event_types=["message"],
            last_connection_time=time.time(),
            queue_timeout=0,
            realm_id=realm.id,
            user_profile_id=hamlet.id,
        )

        client = allocate_client_descriptor(queue_data)

        message_event = dict(
            realm_id=realm.id,
            stream_name="whatever",
        )

        client_info = get_client_info_for_message_event(
            message_event,
            users=[],
        )

        self.assertEqual(len(client_info), 1)

        dct = client_info[client.event_queue.id]
        self.assertEqual(dct["client"].apply_markdown, True)
        self.assertEqual(dct["client"].client_gravatar, True)
        self.assertEqual(dct["client"].user_profile_id, hamlet.id)
        self.assertEqual(dct["flags"], [])
        self.assertEqual(dct["is_sender"], False)

        message_event = dict(
            realm_id=realm.id,
            stream_name="whatever",
            sender_queue_id=client.event_queue.id,
        )

        client_info = get_client_info_for_message_event(
            message_event,
            users=[],
        )
        dct = client_info[client.event_queue.id]
        self.assertEqual(dct["is_sender"], True)

    def test_get_client_info_for_normal_users(self) -> None:
        hamlet = self.example_user("hamlet")
        cordelia = self.example_user("cordelia")
        realm = hamlet.realm

        def test_get_info(apply_markdown: bool, client_gravatar: bool) -> None:
            clear_client_event_queues_for_testing()

            queue_data = dict(
                all_public_streams=False,
                apply_markdown=apply_markdown,
                client_gravatar=client_gravatar,
                client_type_name="website",
                event_types=["message"],
                last_connection_time=time.time(),
                queue_timeout=0,
                realm_id=realm.id,
                user_profile_id=hamlet.id,
            )

            client = allocate_client_descriptor(queue_data)
            message_event = dict(
                realm_id=realm.id,
                stream_name="whatever",
            )

            client_info = get_client_info_for_message_event(
                message_event,
                users=[
                    dict(id=cordelia.id),
                ],
            )

            self.assertEqual(len(client_info), 0)

            client_info = get_client_info_for_message_event(
                message_event,
                users=[
                    dict(id=cordelia.id),
                    dict(id=hamlet.id, flags=["mentioned"]),
                ],
            )
            self.assertEqual(len(client_info), 1)

            dct = client_info[client.event_queue.id]
            self.assertEqual(dct["client"].apply_markdown, apply_markdown)
            self.assertEqual(dct["client"].client_gravatar, client_gravatar)
            self.assertEqual(dct["client"].user_profile_id, hamlet.id)
            self.assertEqual(dct["flags"], ["mentioned"])
            self.assertEqual(dct["is_sender"], False)

        test_get_info(apply_markdown=False, client_gravatar=False)
        test_get_info(apply_markdown=True, client_gravatar=False)

        test_get_info(apply_markdown=False, client_gravatar=True)
        test_get_info(apply_markdown=True, client_gravatar=True)

    def test_process_message_event_with_mocked_client_info(self) -> None:
        hamlet = self.example_user("hamlet")

        class MockClient:
            def __init__(
                self, user_profile_id: int, apply_markdown: bool, client_gravatar: bool
            ) -> None:
                self.user_profile_id = user_profile_id
                self.apply_markdown = apply_markdown
                self.client_gravatar = client_gravatar
                self.client_type_name = "whatever"
                self.events: List[Dict[str, Any]] = []

            def accepts_messages(self) -> bool:
                return True

            def accepts_event(self, event: Dict[str, Any]) -> bool:
                assert event["type"] == "message"
                return True

            def add_event(self, event: Dict[str, Any]) -> None:
                self.events.append(event)

        client1 = MockClient(
            user_profile_id=hamlet.id,
            apply_markdown=True,
            client_gravatar=False,
        )

        client2 = MockClient(
            user_profile_id=hamlet.id,
            apply_markdown=False,
            client_gravatar=False,
        )

        client3 = MockClient(
            user_profile_id=hamlet.id,
            apply_markdown=True,
            client_gravatar=True,
        )

        client4 = MockClient(
            user_profile_id=hamlet.id,
            apply_markdown=False,
            client_gravatar=True,
        )

        client_info = {
            "client:1": dict(
                client=client1,
                flags=["starred"],
            ),
            "client:2": dict(
                client=client2,
                flags=["has_alert_word"],
            ),
            "client:3": dict(
                client=client3,
                flags=[],
            ),
            "client:4": dict(
                client=client4,
                flags=[],
            ),
        }

        sender = hamlet

        message_event = dict(
            message_dict=dict(
                id=999,
                content="**hello**",
                rendered_content="<b>hello</b>",
                sender_id=sender.id,
                type="stream",
                client="website",
                # NOTE: Some of these fields are clutter, but some
                #       will be useful when we let clients specify
                #       that they can compute their own gravatar URLs.
                sender_email=sender.email,
                sender_delivery_email=sender.delivery_email,
                sender_realm_id=sender.realm_id,
                sender_avatar_source=UserProfile.AVATAR_FROM_GRAVATAR,
                sender_avatar_version=1,
                sender_is_mirror_dummy=None,
                recipient_type=None,
                recipient_type_id=None,
            ),
        )

        # Setting users to `[]` bypasses code we don't care about
        # for this test--we assume client_info is correct in our mocks,
        # and we are interested in how messages are put on event queue.
        users: List[Dict[str, Any]] = []

        with mock.patch(
            "zerver.tornado.event_queue.get_client_info_for_message_event", return_value=client_info
        ):
            process_message_event(message_event, users)

        # We are not closely examining avatar_url at this point, so
        # just sanity check them and then delete the keys so that
        # upcoming comparisons work.
        for client in [client1, client2]:
            message = client.events[0]["message"]
            self.assertIn("gravatar.com", message["avatar_url"])
            message.pop("avatar_url")

        self.assertEqual(
            client1.events,
            [
                dict(
                    type="message",
                    message=dict(
                        type="stream",
                        sender_id=sender.id,
                        sender_email=sender.email,
                        id=999,
                        content="<b>hello</b>",
                        content_type="text/html",
                        client="website",
                    ),
                    flags=["starred"],
                ),
            ],
        )

        self.assertEqual(
            client2.events,
            [
                dict(
                    type="message",
                    message=dict(
                        type="stream",
                        sender_id=sender.id,
                        sender_email=sender.email,
                        id=999,
                        content="**hello**",
                        content_type="text/x-markdown",
                        client="website",
                    ),
                    flags=["has_alert_word"],
                ),
            ],
        )

        self.assertEqual(
            client3.events,
            [
                dict(
                    type="message",
                    message=dict(
                        type="stream",
                        sender_id=sender.id,
                        sender_email=sender.email,
                        avatar_url=None,
                        id=999,
                        content="<b>hello</b>",
                        content_type="text/html",
                        client="website",
                    ),
                    flags=[],
                ),
            ],
        )

        self.assertEqual(
            client4.events,
            [
                dict(
                    type="message",
                    message=dict(
                        type="stream",
                        sender_id=sender.id,
                        sender_email=sender.email,
                        avatar_url=None,
                        id=999,
                        content="**hello**",
                        content_type="text/x-markdown",
                        client="website",
                    ),
                    flags=[],
                ),
            ],
        )


class RestartEventsTest(ZulipTestCase):
    def test_restart(self) -> None:
        hamlet = self.example_user("hamlet")
        realm = hamlet.realm

        clear_client_event_queues_for_testing()

        queue_data = dict(
            all_public_streams=False,
            apply_markdown=True,
            client_gravatar=True,
            client_type_name="website",
            event_types=None,
            last_connection_time=time.time(),
            queue_timeout=0,
            realm_id=realm.id,
            user_profile_id=hamlet.id,
        )
        client = allocate_client_descriptor(queue_data)

        send_restart_events(immediate=True)

        # For now we only verify that a virtual event
        # gets added to the client's event_queue.  We
        # may decide to write a deeper test in the future
        # that exercises the finish_handler.
        virtual_events = client.event_queue.virtual_events
        self.assertEqual(len(virtual_events), 1)
        restart_event = virtual_events["restart"]

        check_restart_event("restart_event", restart_event)
        self.assertEqual(
            restart_event,
            dict(
                type="restart",
                server_generation=settings.SERVER_GENERATION,
                immediate=True,
                id=0,
            ),
        )


class FetchQueriesTest(ZulipTestCase):
    def test_queries(self) -> None:
        user = self.example_user("hamlet")

        self.login_user(user)

        flush_per_request_caches()
        with queries_captured() as queries:
            with mock.patch("zerver.lib.events.always_want") as want_mock:
                fetch_initial_state_data(user)

        self.assert_length(queries, 31)

        expected_counts = dict(
            alert_words=1,
            custom_profile_fields=1,
            default_streams=1,
            default_stream_groups=1,
            hotspots=0,
            message=1,
            muted_topics=1,
            muted_users=1,
            presence=1,
            realm=0,
            realm_bot=1,
            realm_domains=1,
            realm_embedded_bots=0,
            realm_incoming_webhook_bots=0,
            realm_emoji=1,
            realm_filters=1,
            realm_linkifiers=1,
            realm_playgrounds=1,
            realm_user=3,
            realm_user_groups=2,
            recent_private_conversations=1,
            starred_messages=1,
            stream=2,
            stop_words=0,
            subscription=4,
            update_display_settings=0,
            update_global_notifications=0,
            update_message_flags=5,
            user_status=1,
            video_calls=0,
            giphy=0,
        )

        wanted_event_types = {item[0][0] for item in want_mock.call_args_list}

        self.assertEqual(wanted_event_types, set(expected_counts))

        for event_type in sorted(wanted_event_types):
            count = expected_counts[event_type]
            flush_per_request_caches()
            with queries_captured() as queries:
                if event_type == "update_message_flags":
                    event_types = ["update_message_flags", "message"]
                else:
                    event_types = [event_type]

                fetch_initial_state_data(user, event_types=event_types)
            self.assert_length(queries, count)


class TestEventsRegisterAllPublicStreamsDefaults(ZulipTestCase):
    def setUp(self) -> None:
        super().setUp()
        self.user_profile = self.example_user("hamlet")
        self.email = self.user_profile.email

    def test_use_passed_all_public_true_default_false(self) -> None:
        self.user_profile.default_all_public_streams = False
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, True)
        self.assertTrue(result)

    def test_use_passed_all_public_true_default(self) -> None:
        self.user_profile.default_all_public_streams = True
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, True)
        self.assertTrue(result)

    def test_use_passed_all_public_false_default_false(self) -> None:
        self.user_profile.default_all_public_streams = False
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, False)
        self.assertFalse(result)

    def test_use_passed_all_public_false_default_true(self) -> None:
        self.user_profile.default_all_public_streams = True
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, False)
        self.assertFalse(result)

    def test_use_true_default_for_none(self) -> None:
        self.user_profile.default_all_public_streams = True
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, None)
        self.assertTrue(result)

    def test_use_false_default_for_none(self) -> None:
        self.user_profile.default_all_public_streams = False
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, None)
        self.assertFalse(result)


class TestEventsRegisterNarrowDefaults(ZulipTestCase):
    def setUp(self) -> None:
        super().setUp()
        self.user_profile = self.example_user("hamlet")
        self.email = self.user_profile.email
        self.stream = get_stream("Verona", self.user_profile.realm)

    def test_use_passed_narrow_no_default(self) -> None:
        self.user_profile.default_events_register_stream_id = None
        self.user_profile.save()
        result = _default_narrow(self.user_profile, [["stream", "my_stream"]])
        self.assertEqual(result, [["stream", "my_stream"]])

    def test_use_passed_narrow_with_default(self) -> None:
        self.user_profile.default_events_register_stream_id = self.stream.id
        self.user_profile.save()
        result = _default_narrow(self.user_profile, [["stream", "my_stream"]])
        self.assertEqual(result, [["stream", "my_stream"]])

    def test_use_default_if_narrow_is_empty(self) -> None:
        self.user_profile.default_events_register_stream_id = self.stream.id
        self.user_profile.save()
        result = _default_narrow(self.user_profile, [])
        self.assertEqual(result, [["stream", "Verona"]])

    def test_use_narrow_if_default_is_none(self) -> None:
        self.user_profile.default_events_register_stream_id = None
        self.user_profile.save()
        result = _default_narrow(self.user_profile, [])
        self.assertEqual(result, [])


class TestGetRawUserDataSystemBotRealm(ZulipTestCase):
    def test_get_raw_user_data_on_system_bot_realm(self) -> None:
        result = get_raw_user_data(
            get_realm("zulipinternal"),
            self.example_user("hamlet"),
            client_gravatar=True,
            user_avatar_url_field_optional=True,
        )

        for bot_email in settings.CROSS_REALM_BOT_EMAILS:
            bot_profile = get_system_bot(bot_email)
            self.assertTrue(bot_profile.id in result)
            self.assertTrue(result[bot_profile.id]["is_cross_realm_bot"])