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zulip/zerver/lib/message.py

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Python
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import datetime
import ujson
import zlib
import ahocorasick
from django.utils.translation import ugettext as _
from django.utils.timezone import now as timezone_now
from django.db import connection
from django.db.models import Sum
from analytics.lib.counts import COUNT_STATS, RealmCount
from zerver.lib.avatar import get_avatar_field
import zerver.lib.bugdown as bugdown
from zerver.lib.cache import (
cache_with_key,
generic_bulk_cached_fetch,
to_dict_cache_key,
to_dict_cache_key_id,
)
from zerver.lib.display_recipient import UserDisplayRecipient, DisplayRecipientT, \
bulk_fetch_display_recipients
from zerver.lib.request import JsonableError
from zerver.lib.stream_subscription import (
get_stream_subscriptions_for_user,
)
from zerver.lib.timestamp import datetime_to_timestamp
from zerver.lib.topic import (
DB_TOPIC_NAME,
MESSAGE__TOPIC,
TOPIC_LINKS,
TOPIC_NAME,
)
from zerver.lib.topic_mutes import (
build_topic_mute_checker,
topic_is_muted,
)
from zerver.models import (
get_display_recipient_by_id,
get_user_profile_by_id,
query_for_ids,
Message,
Realm,
Recipient,
Stream,
SubMessage,
Subscription,
UserProfile,
UserMessage,
Reaction,
get_usermessage_by_message_id,
)
from typing import Any, Dict, List, Optional, Set, Tuple, Sequence
from typing_extensions import TypedDict
RealmAlertWords = Dict[int, List[str]]
RawUnreadMessagesResult = TypedDict('RawUnreadMessagesResult', {
'pm_dict': Dict[int, Any],
'stream_dict': Dict[int, Any],
'huddle_dict': Dict[int, Any],
'mentions': Set[int],
'muted_stream_ids': List[int],
'unmuted_stream_msgs': Set[int],
})
UnreadMessagesResult = TypedDict('UnreadMessagesResult', {
'pms': List[Dict[str, Any]],
'streams': List[Dict[str, Any]],
'huddles': List[Dict[str, Any]],
'mentions': List[int],
'count': int,
})
# We won't try to fetch more unread message IDs from the database than
# this limit. The limit is super high, in large part because it means
# client-side code mostly doesn't need to think about the case that a
# user has more older unread messages that were cut off.
MAX_UNREAD_MESSAGES = 50000
def messages_for_ids(message_ids: List[int],
user_message_flags: Dict[int, List[str]],
search_fields: Dict[int, Dict[str, str]],
apply_markdown: bool,
client_gravatar: bool,
allow_edit_history: bool) -> List[Dict[str, Any]]:
cache_transformer = MessageDict.build_dict_from_raw_db_row
id_fetcher = lambda row: row['id']
message_dicts = generic_bulk_cached_fetch(
to_dict_cache_key_id,
MessageDict.get_raw_db_rows,
message_ids,
id_fetcher=id_fetcher,
cache_transformer=cache_transformer,
extractor=extract_message_dict,
setter=stringify_message_dict)
message_list = [] # type: List[Dict[str, Any]]
for message_id in message_ids:
msg_dict = message_dicts[message_id]
msg_dict.update({"flags": user_message_flags[message_id]})
if message_id in search_fields:
msg_dict.update(search_fields[message_id])
# Make sure that we never send message edit history to clients
# in realms with allow_edit_history disabled.
if "edit_history" in msg_dict and not allow_edit_history:
del msg_dict["edit_history"]
message_list.append(msg_dict)
MessageDict.post_process_dicts(message_list, apply_markdown, client_gravatar)
return message_list
def sew_messages_and_reactions(messages: List[Dict[str, Any]],
reactions: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
"""Given a iterable of messages and reactions stitch reactions
into messages.
"""
# Add all messages with empty reaction item
for message in messages:
message['reactions'] = []
# Convert list of messages into dictionary to make reaction stitching easy
converted_messages = {message['id']: message for message in messages}
for reaction in reactions:
converted_messages[reaction['message_id']]['reactions'].append(
reaction)
return list(converted_messages.values())
def sew_messages_and_submessages(messages: List[Dict[str, Any]],
submessages: List[Dict[str, Any]]) -> None:
# This is super similar to sew_messages_and_reactions.
for message in messages:
message['submessages'] = []
message_dict = {message['id']: message for message in messages}
for submessage in submessages:
message_id = submessage['message_id']
if message_id in message_dict:
message = message_dict[message_id]
message['submessages'].append(submessage)
def extract_message_dict(message_bytes: bytes) -> Dict[str, Any]:
return ujson.loads(zlib.decompress(message_bytes).decode("utf-8"))
def stringify_message_dict(message_dict: Dict[str, Any]) -> bytes:
return zlib.compress(ujson.dumps(message_dict).encode())
@cache_with_key(to_dict_cache_key, timeout=3600*24)
def message_to_dict_json(message: Message) -> bytes:
return MessageDict.to_dict_uncached(message)
def save_message_rendered_content(message: Message, content: str) -> str:
rendered_content = render_markdown(message, content, realm=message.get_realm())
message.rendered_content = rendered_content
message.rendered_content_version = bugdown.version
message.save_rendered_content()
return rendered_content
class MessageDict:
@staticmethod
def wide_dict(message: Message) -> Dict[str, Any]:
'''
The next two lines get the cachable field related
to our message object, with the side effect of
populating the cache.
'''
json = message_to_dict_json(message)
obj = extract_message_dict(json)
'''
The steps below are similar to what we do in
post_process_dicts(), except we don't call finalize_payload(),
since that step happens later in the queue
processor.
'''
MessageDict.bulk_hydrate_sender_info([obj])
MessageDict.bulk_hydrate_recipient_info([obj])
return obj
@staticmethod
def post_process_dicts(objs: List[Dict[str, Any]], apply_markdown: bool, client_gravatar: bool) -> None:
MessageDict.bulk_hydrate_sender_info(objs)
MessageDict.bulk_hydrate_recipient_info(objs)
for obj in objs:
MessageDict.finalize_payload(obj, apply_markdown, client_gravatar)
@staticmethod
def finalize_payload(obj: Dict[str, Any],
apply_markdown: bool,
client_gravatar: bool,
keep_rendered_content: bool=False) -> None:
MessageDict.set_sender_avatar(obj, client_gravatar)
if apply_markdown:
obj['content_type'] = 'text/html'
obj['content'] = obj['rendered_content']
else:
obj['content_type'] = 'text/x-markdown'
if not keep_rendered_content:
del obj['rendered_content']
del obj['sender_realm_id']
del obj['sender_avatar_source']
del obj['sender_delivery_email']
del obj['sender_avatar_version']
del obj['recipient_type']
del obj['recipient_type_id']
del obj['sender_is_mirror_dummy']
@staticmethod
def to_dict_uncached(message: Message) -> bytes:
dct = MessageDict.to_dict_uncached_helper(message)
return stringify_message_dict(dct)
@staticmethod
def to_dict_uncached_helper(message: Message) -> Dict[str, Any]:
return MessageDict.build_message_dict(
message = message,
message_id = message.id,
last_edit_time = message.last_edit_time,
edit_history = message.edit_history,
content = message.content,
topic_name = message.topic_name(),
date_sent = message.date_sent,
rendered_content = message.rendered_content,
rendered_content_version = message.rendered_content_version,
sender_id = message.sender.id,
sender_realm_id = message.sender.realm_id,
sending_client_name = message.sending_client.name,
recipient_id = message.recipient.id,
recipient_type = message.recipient.type,
recipient_type_id = message.recipient.type_id,
reactions = Reaction.get_raw_db_rows([message.id]),
submessages = SubMessage.get_raw_db_rows([message.id]),
)
@staticmethod
def get_raw_db_rows(needed_ids: List[int]) -> List[Dict[str, Any]]:
# This is a special purpose function optimized for
# callers like get_messages_backend().
fields = [
'id',
DB_TOPIC_NAME,
'date_sent',
'last_edit_time',
'edit_history',
'content',
'rendered_content',
'rendered_content_version',
'recipient_id',
'recipient__type',
'recipient__type_id',
'sender_id',
'sending_client__name',
'sender__realm_id',
]
messages = Message.objects.filter(id__in=needed_ids).values(*fields)
submessages = SubMessage.get_raw_db_rows(needed_ids)
sew_messages_and_submessages(messages, submessages)
reactions = Reaction.get_raw_db_rows(needed_ids)
return sew_messages_and_reactions(messages, reactions)
@staticmethod
def build_dict_from_raw_db_row(row: Dict[str, Any]) -> Dict[str, Any]:
'''
row is a row from a .values() call, and it needs to have
all the relevant fields populated
'''
return MessageDict.build_message_dict(
message = None,
message_id = row['id'],
last_edit_time = row['last_edit_time'],
edit_history = row['edit_history'],
content = row['content'],
topic_name = row[DB_TOPIC_NAME],
date_sent = row['date_sent'],
rendered_content = row['rendered_content'],
rendered_content_version = row['rendered_content_version'],
sender_id = row['sender_id'],
sender_realm_id = row['sender__realm_id'],
sending_client_name = row['sending_client__name'],
recipient_id = row['recipient_id'],
recipient_type = row['recipient__type'],
recipient_type_id = row['recipient__type_id'],
reactions=row['reactions'],
submessages=row['submessages'],
)
@staticmethod
def build_message_dict(
message: Optional[Message],
message_id: int,
last_edit_time: Optional[datetime.datetime],
edit_history: Optional[str],
content: str,
topic_name: str,
date_sent: datetime.datetime,
rendered_content: Optional[str],
rendered_content_version: Optional[int],
sender_id: int,
sender_realm_id: int,
sending_client_name: str,
recipient_id: int,
recipient_type: int,
recipient_type_id: int,
reactions: List[Dict[str, Any]],
submessages: List[Dict[str, Any]]
) -> Dict[str, Any]:
obj = dict(
id = message_id,
sender_id = sender_id,
content = content,
recipient_type_id = recipient_type_id,
recipient_type = recipient_type,
recipient_id = recipient_id,
timestamp = datetime_to_timestamp(date_sent),
client = sending_client_name)
obj[TOPIC_NAME] = topic_name
obj['sender_realm_id'] = sender_realm_id
# Render topic_links with the stream's realm instead of the
# user's realm; this is important for messages sent by
# cross-realm bots like NOTIFICATION_BOT.
#
# TODO: We could potentially avoid this database query in
# common cases by optionally passing through the
# stream_realm_id through the code path from do_send_messages
# (where we've already fetched the data). It would involve
# somewhat messy plumbing, but would probably be worth it.
rendering_realm_id = sender_realm_id
if message and recipient_type == Recipient.STREAM:
rendering_realm_id = Stream.objects.get(id=recipient_type_id).realm_id
obj[TOPIC_LINKS] = bugdown.topic_links(rendering_realm_id, topic_name)
if last_edit_time is not None:
obj['last_edit_timestamp'] = datetime_to_timestamp(last_edit_time)
assert edit_history is not None
obj['edit_history'] = ujson.loads(edit_history)
if Message.need_to_render_content(rendered_content, rendered_content_version, bugdown.version):
if message is None:
# We really shouldn't be rendering objects in this method, but there is
# a scenario where we upgrade the version of bugdown and fail to run
# management commands to re-render historical messages, and then we
# need to have side effects. This method is optimized to not need full
# blown ORM objects, but the bugdown renderer is unfortunately highly
# coupled to Message, and we also need to persist the new rendered content.
# If we don't have a message object passed in, we get one here. The cost
# of going to the DB here should be overshadowed by the cost of rendering
# and updating the row.
# TODO: see #1379 to eliminate bugdown dependencies
message = Message.objects.select_related().get(id=message_id)
assert message is not None # Hint for mypy.
# It's unfortunate that we need to have side effects on the message
# in some cases.
rendered_content = save_message_rendered_content(message, content)
if rendered_content is not None:
obj['rendered_content'] = rendered_content
else:
obj['rendered_content'] = ('<p>[Zulip note: Sorry, we could not ' +
'understand the formatting of your message]</p>')
if rendered_content is not None:
obj['is_me_message'] = Message.is_status_message(content, rendered_content)
else:
obj['is_me_message'] = False
obj['reactions'] = [ReactionDict.build_dict_from_raw_db_row(reaction)
for reaction in reactions]
obj['submessages'] = submessages
return obj
@staticmethod
def bulk_hydrate_sender_info(objs: List[Dict[str, Any]]) -> None:
sender_ids = list({
obj['sender_id']
for obj in objs
})
if not sender_ids:
return
query = UserProfile.objects.values(
'id',
'full_name',
'short_name',
'delivery_email',
'email',
'realm__string_id',
'avatar_source',
'avatar_version',
'is_mirror_dummy',
)
rows = query_for_ids(query, sender_ids, 'zerver_userprofile.id')
sender_dict = {
row['id']: row
for row in rows
}
for obj in objs:
sender_id = obj['sender_id']
user_row = sender_dict[sender_id]
obj['sender_full_name'] = user_row['full_name']
obj['sender_short_name'] = user_row['short_name']
obj['sender_email'] = user_row['email']
obj['sender_delivery_email'] = user_row['delivery_email']
obj['sender_realm_str'] = user_row['realm__string_id']
obj['sender_avatar_source'] = user_row['avatar_source']
obj['sender_avatar_version'] = user_row['avatar_version']
obj['sender_is_mirror_dummy'] = user_row['is_mirror_dummy']
@staticmethod
def hydrate_recipient_info(obj: Dict[str, Any], display_recipient: DisplayRecipientT) -> None:
'''
This method hyrdrates recipient info with things
like full names and emails of senders. Eventually
our clients should be able to hyrdrate these fields
themselves with info they already have on users.
'''
recipient_type = obj['recipient_type']
recipient_type_id = obj['recipient_type_id']
sender_is_mirror_dummy = obj['sender_is_mirror_dummy']
sender_email = obj['sender_email']
sender_full_name = obj['sender_full_name']
sender_short_name = obj['sender_short_name']
sender_id = obj['sender_id']
if recipient_type == Recipient.STREAM:
display_type = "stream"
elif recipient_type in (Recipient.HUDDLE, Recipient.PERSONAL):
assert not isinstance(display_recipient, str)
display_type = "private"
if len(display_recipient) == 1:
# add the sender in if this isn't a message between
# someone and themself, preserving ordering
recip = {'email': sender_email,
'full_name': sender_full_name,
'short_name': sender_short_name,
'id': sender_id,
'is_mirror_dummy': sender_is_mirror_dummy} # type: UserDisplayRecipient
if recip['email'] < display_recipient[0]['email']:
display_recipient = [recip, display_recipient[0]]
elif recip['email'] > display_recipient[0]['email']:
display_recipient = [display_recipient[0], recip]
else:
raise AssertionError("Invalid recipient type %s" % (recipient_type,))
obj['display_recipient'] = display_recipient
obj['type'] = display_type
if obj['type'] == 'stream':
obj['stream_id'] = recipient_type_id
@staticmethod
def bulk_hydrate_recipient_info(objs: List[Dict[str, Any]]) -> None:
recipient_tuples = set( # We use set to eliminate duplicate tuples.
(
obj['recipient_id'],
obj['recipient_type'],
obj['recipient_type_id']
) for obj in objs
)
display_recipients = bulk_fetch_display_recipients(recipient_tuples)
for obj in objs:
MessageDict.hydrate_recipient_info(obj, display_recipients[obj['recipient_id']])
@staticmethod
def set_sender_avatar(obj: Dict[str, Any], client_gravatar: bool) -> None:
sender_id = obj['sender_id']
sender_realm_id = obj['sender_realm_id']
sender_delivery_email = obj['sender_delivery_email']
sender_avatar_source = obj['sender_avatar_source']
sender_avatar_version = obj['sender_avatar_version']
obj['avatar_url'] = get_avatar_field(
user_id=sender_id,
realm_id=sender_realm_id,
email=sender_delivery_email,
avatar_source=sender_avatar_source,
avatar_version=sender_avatar_version,
medium=False,
client_gravatar=client_gravatar,
)
class ReactionDict:
@staticmethod
def build_dict_from_raw_db_row(row: Dict[str, Any]) -> Dict[str, Any]:
return {'emoji_name': row['emoji_name'],
'emoji_code': row['emoji_code'],
'reaction_type': row['reaction_type'],
'user': {'email': row['user_profile__email'],
'id': row['user_profile__id'],
'full_name': row['user_profile__full_name']}}
def access_message(user_profile: UserProfile, message_id: int) -> Tuple[Message, Optional[UserMessage]]:
"""You can access a message by ID in our APIs that either:
(1) You received or have previously accessed via starring
(aka have a UserMessage row for).
(2) Was sent to a public stream in your realm.
We produce consistent, boring error messages to avoid leaking any
information from a security perspective.
"""
try:
message = Message.objects.select_related().get(id=message_id)
except Message.DoesNotExist:
raise JsonableError(_("Invalid message(s)"))
user_message = get_usermessage_by_message_id(user_profile, message_id)
if has_message_access(user_profile, message, user_message):
return (message, user_message)
raise JsonableError(_("Invalid message(s)"))
def has_message_access(user_profile: UserProfile, message: Message,
user_message: Optional[UserMessage]) -> bool:
if user_message is None:
if message.recipient.type != Recipient.STREAM:
# You can't access private messages you didn't receive
return False
stream = Stream.objects.get(id=message.recipient.type_id)
if stream.realm != user_profile.realm:
# You can't access public stream messages in other realms
return False
if not stream.is_history_public_to_subscribers():
# You can't access messages you didn't directly receive
# unless history is public to subscribers.
return False
if not stream.is_public():
# This stream is an invite-only stream where message
# history is available to subscribers. So we check if
# you're subscribed.
if not Subscription.objects.filter(user_profile=user_profile, active=True,
recipient=message.recipient).exists():
return False
# You are subscribed, so let this fall through to the public stream case.
elif user_profile.is_guest:
# Guest users don't get automatic access to public stream messages
if not Subscription.objects.filter(user_profile=user_profile, active=True,
recipient=message.recipient).exists():
return False
else:
# Otherwise, the message was sent to a public stream in
# your realm, so return the message, user_message pair
pass
return True
def bulk_access_messages(user_profile: UserProfile, messages: Sequence[Message]) -> List[Message]:
filtered_messages = []
for message in messages:
user_message = get_usermessage_by_message_id(user_profile, message.id)
if has_message_access(user_profile, message, user_message):
filtered_messages.append(message)
return filtered_messages
def bulk_access_messages_expect_usermessage(
user_profile_id: int, message_ids: Sequence[int]) -> List[int]:
'''
Like bulk_access_messages, but faster and potentially stricter.
Returns a subset of `message_ids` containing only messages the
user can access. Makes O(1) database queries.
Use this function only when the user is expected to have a
UserMessage row for every message in `message_ids`. If a
UserMessage row is missing, the message will be omitted even if
the user has access (e.g. because it went to a public stream.)
See also: `access_message`, `bulk_access_messages`.
'''
return UserMessage.objects.filter(
user_profile_id=user_profile_id,
message_id__in=message_ids,
).values_list('message_id', flat=True)
def render_markdown(message: Message,
content: str,
realm: Optional[Realm]=None,
realm_alert_words_automaton: Optional[ahocorasick.Automaton]=None,
user_ids: Optional[Set[int]]=None,
mention_data: Optional[bugdown.MentionData]=None,
email_gateway: Optional[bool]=False) -> str:
'''
This is basically just a wrapper for do_render_markdown.
'''
if user_ids is None:
message_user_ids = set() # type: Set[int]
else:
message_user_ids = user_ids
if realm is None:
realm = message.get_realm()
sender = get_user_profile_by_id(message.sender_id)
sent_by_bot = sender.is_bot
translate_emoticons = sender.translate_emoticons
rendered_content = do_render_markdown(
message=message,
content=content,
realm=realm,
realm_alert_words_automaton=realm_alert_words_automaton,
message_user_ids=message_user_ids,
sent_by_bot=sent_by_bot,
translate_emoticons=translate_emoticons,
mention_data=mention_data,
email_gateway=email_gateway,
)
return rendered_content
def do_render_markdown(message: Message,
content: str,
realm: Realm,
message_user_ids: Set[int],
sent_by_bot: bool,
translate_emoticons: bool,
realm_alert_words_automaton: Optional[ahocorasick.Automaton]=None,
mention_data: Optional[bugdown.MentionData]=None,
email_gateway: Optional[bool]=False) -> str:
"""Return HTML for given markdown. Bugdown may add properties to the
message object such as `mentions_user_ids`, `mentions_user_group_ids`, and
`mentions_wildcard`. These are only on this Django object and are not
saved in the database.
"""
message.mentions_wildcard = False
message.mentions_user_ids = set()
message.mentions_user_group_ids = set()
message.alert_words = set()
message.links_for_preview = set()
message.user_ids_with_alert_words = set()
# DO MAIN WORK HERE -- call bugdown to convert
rendered_content = bugdown.convert(
content,
realm_alert_words_automaton=realm_alert_words_automaton,
message=message,
message_realm=realm,
sent_by_bot=sent_by_bot,
translate_emoticons=translate_emoticons,
mention_data=mention_data,
email_gateway=email_gateway
)
return rendered_content
def huddle_users(recipient_id: int) -> str:
display_recipient = get_display_recipient_by_id(recipient_id,
Recipient.HUDDLE,
None) # type: DisplayRecipientT
# str is for streams.
assert not isinstance(display_recipient, str)
user_ids = [obj['id'] for obj in display_recipient] # type: List[int]
user_ids = sorted(user_ids)
return ','.join(str(uid) for uid in user_ids)
def aggregate_message_dict(input_dict: Dict[int, Dict[str, Any]],
lookup_fields: List[str],
collect_senders: bool) -> List[Dict[str, Any]]:
lookup_dict = dict() # type: Dict[Tuple[Any, ...], Dict[str, Any]]
'''
A concrete example might help explain the inputs here:
input_dict = {
1002: dict(stream_id=5, topic='foo', sender_id=40),
1003: dict(stream_id=5, topic='foo', sender_id=41),
1004: dict(stream_id=6, topic='baz', sender_id=99),
}
lookup_fields = ['stream_id', 'topic']
The first time through the loop:
attribute_dict = dict(stream_id=5, topic='foo', sender_id=40)
lookup_dict = (5, 'foo')
lookup_dict = {
(5, 'foo'): dict(stream_id=5, topic='foo',
unread_message_ids=[1002, 1003],
sender_ids=[40, 41],
),
...
}
result = [
dict(stream_id=5, topic='foo',
unread_message_ids=[1002, 1003],
sender_ids=[40, 41],
),
...
]
'''
for message_id, attribute_dict in input_dict.items():
lookup_key = tuple([attribute_dict[f] for f in lookup_fields])
if lookup_key not in lookup_dict:
obj = {}
for f in lookup_fields:
obj[f] = attribute_dict[f]
obj['unread_message_ids'] = []
if collect_senders:
obj['sender_ids'] = set()
lookup_dict[lookup_key] = obj
bucket = lookup_dict[lookup_key]
bucket['unread_message_ids'].append(message_id)
if collect_senders:
bucket['sender_ids'].add(attribute_dict['sender_id'])
for dct in lookup_dict.values():
dct['unread_message_ids'].sort()
if collect_senders:
dct['sender_ids'] = sorted(list(dct['sender_ids']))
sorted_keys = sorted(lookup_dict.keys())
return [lookup_dict[k] for k in sorted_keys]
def get_inactive_recipient_ids(user_profile: UserProfile) -> List[int]:
rows = get_stream_subscriptions_for_user(user_profile).filter(
active=False,
).values(
'recipient_id'
)
inactive_recipient_ids = [
row['recipient_id']
for row in rows]
return inactive_recipient_ids
def get_muted_stream_ids(user_profile: UserProfile) -> List[int]:
rows = get_stream_subscriptions_for_user(user_profile).filter(
active=True,
is_muted=True,
).values(
'recipient__type_id'
)
muted_stream_ids = [
row['recipient__type_id']
for row in rows]
return muted_stream_ids
def get_starred_message_ids(user_profile: UserProfile) -> List[int]:
return list(UserMessage.objects.filter(
user_profile=user_profile,
).extra(
where=[UserMessage.where_starred()]
).order_by(
'message_id'
).values_list('message_id', flat=True)[0:10000])
def get_raw_unread_data(user_profile: UserProfile) -> RawUnreadMessagesResult:
excluded_recipient_ids = get_inactive_recipient_ids(user_profile)
user_msgs = UserMessage.objects.filter(
user_profile=user_profile
).exclude(
message__recipient_id__in=excluded_recipient_ids
).extra(
where=[UserMessage.where_unread()]
).values(
'message_id',
'message__sender_id',
MESSAGE__TOPIC,
'message__recipient_id',
'message__recipient__type',
'message__recipient__type_id',
'flags',
).order_by("-message_id")
# Limit unread messages for performance reasons.
user_msgs = list(user_msgs[:MAX_UNREAD_MESSAGES])
rows = list(reversed(user_msgs))
muted_stream_ids = get_muted_stream_ids(user_profile)
topic_mute_checker = build_topic_mute_checker(user_profile)
def is_row_muted(stream_id: int, recipient_id: int, topic: str) -> bool:
if stream_id in muted_stream_ids:
return True
if topic_mute_checker(recipient_id, topic):
return True
return False
huddle_cache = {} # type: Dict[int, str]
def get_huddle_users(recipient_id: int) -> str:
if recipient_id in huddle_cache:
return huddle_cache[recipient_id]
user_ids_string = huddle_users(recipient_id)
huddle_cache[recipient_id] = user_ids_string
return user_ids_string
pm_dict = {}
stream_dict = {}
unmuted_stream_msgs = set()
huddle_dict = {}
mentions = set()
for row in rows:
message_id = row['message_id']
msg_type = row['message__recipient__type']
recipient_id = row['message__recipient_id']
sender_id = row['message__sender_id']
if msg_type == Recipient.STREAM:
stream_id = row['message__recipient__type_id']
topic = row[MESSAGE__TOPIC]
stream_dict[message_id] = dict(
stream_id=stream_id,
topic=topic,
sender_id=sender_id,
)
if not is_row_muted(stream_id, recipient_id, topic):
unmuted_stream_msgs.add(message_id)
elif msg_type == Recipient.PERSONAL:
if sender_id == user_profile.id:
other_user_id = row['message__recipient__type_id']
else:
other_user_id = sender_id
# The `sender_id` field here is misnamed. It's really
# just the other participant in a PM conversation. For
# most unread PM messages, the other user is also the sender,
# but that's not true for certain messages sent from the
# API. Unfortunately, it's difficult now to rename the
# field without breaking mobile.
pm_dict[message_id] = dict(
sender_id=other_user_id,
)
elif msg_type == Recipient.HUDDLE:
user_ids_string = get_huddle_users(recipient_id)
huddle_dict[message_id] = dict(
user_ids_string=user_ids_string,
)
# TODO: Add support for alert words here as well.
is_mentioned = (row['flags'] & UserMessage.flags.mentioned) != 0
is_wildcard_mentioned = (row['flags'] & UserMessage.flags.wildcard_mentioned) != 0
if is_mentioned:
mentions.add(message_id)
if is_wildcard_mentioned:
if msg_type == Recipient.STREAM:
stream_id = row['message__recipient__type_id']
topic = row[MESSAGE__TOPIC]
if not is_row_muted(stream_id, recipient_id, topic):
mentions.add(message_id)
else: # nocoverage # TODO: Test wildcard mentions in PMs.
mentions.add(message_id)
return dict(
pm_dict=pm_dict,
stream_dict=stream_dict,
muted_stream_ids=muted_stream_ids,
unmuted_stream_msgs=unmuted_stream_msgs,
huddle_dict=huddle_dict,
mentions=mentions,
)
def aggregate_unread_data(raw_data: RawUnreadMessagesResult) -> UnreadMessagesResult:
pm_dict = raw_data['pm_dict']
stream_dict = raw_data['stream_dict']
unmuted_stream_msgs = raw_data['unmuted_stream_msgs']
huddle_dict = raw_data['huddle_dict']
mentions = list(raw_data['mentions'])
count = len(pm_dict) + len(unmuted_stream_msgs) + len(huddle_dict)
pm_objects = aggregate_message_dict(
input_dict=pm_dict,
lookup_fields=[
'sender_id',
],
collect_senders=False,
)
stream_objects = aggregate_message_dict(
input_dict=stream_dict,
lookup_fields=[
'stream_id',
'topic',
],
collect_senders=True,
)
huddle_objects = aggregate_message_dict(
input_dict=huddle_dict,
lookup_fields=[
'user_ids_string',
],
collect_senders=False,
)
result = dict(
pms=pm_objects,
streams=stream_objects,
huddles=huddle_objects,
mentions=mentions,
count=count) # type: UnreadMessagesResult
return result
def apply_unread_message_event(user_profile: UserProfile,
state: RawUnreadMessagesResult,
message: Dict[str, Any],
flags: List[str]) -> None:
message_id = message['id']
if message['type'] == 'stream':
message_type = 'stream'
elif message['type'] == 'private':
others = [
recip for recip in message['display_recipient']
if recip['id'] != user_profile.id
]
if len(others) <= 1:
message_type = 'private'
else:
message_type = 'huddle'
else:
raise AssertionError("Invalid message type %s" % (message['type'],))
sender_id = message['sender_id']
if message_type == 'stream':
stream_id = message['stream_id']
topic = message[TOPIC_NAME]
new_row = dict(
stream_id=stream_id,
topic=topic,
sender_id=sender_id,
)
state['stream_dict'][message_id] = new_row
if stream_id not in state['muted_stream_ids']:
# This next check hits the database.
if not topic_is_muted(user_profile, stream_id, topic):
state['unmuted_stream_msgs'].add(message_id)
elif message_type == 'private':
if len(others) == 1:
other_id = others[0]['id']
else:
other_id = user_profile.id
# The `sender_id` field here is misnamed.
new_row = dict(
sender_id=other_id,
)
state['pm_dict'][message_id] = new_row
else:
display_recipient = message['display_recipient']
user_ids = [obj['id'] for obj in display_recipient]
user_ids = sorted(user_ids)
user_ids_string = ','.join(str(uid) for uid in user_ids)
new_row = dict(
user_ids_string=user_ids_string,
)
state['huddle_dict'][message_id] = new_row
if 'mentioned' in flags:
state['mentions'].add(message_id)
if 'wildcard_mentioned' in flags:
if message_id in state['unmuted_stream_msgs']:
state['mentions'].add(message_id)
def remove_message_id_from_unread_mgs(state: RawUnreadMessagesResult,
message_id: int) -> None:
# The opposite of apply_unread_message_event; removes a read or
# deleted message from a raw_unread_msgs data structure.
state['pm_dict'].pop(message_id, None)
state['stream_dict'].pop(message_id, None)
state['huddle_dict'].pop(message_id, None)
state['unmuted_stream_msgs'].discard(message_id)
state['mentions'].discard(message_id)
def estimate_recent_messages(realm: Realm, hours: int) -> int:
stat = COUNT_STATS['messages_sent:is_bot:hour']
d = timezone_now() - datetime.timedelta(hours=hours)
return RealmCount.objects.filter(property=stat.property, end_time__gt=d,
realm=realm).aggregate(Sum('value'))['value__sum'] or 0
def get_first_visible_message_id(realm: Realm) -> int:
return realm.first_visible_message_id
def maybe_update_first_visible_message_id(realm: Realm, lookback_hours: int) -> None:
recent_messages_count = estimate_recent_messages(realm, lookback_hours)
if realm.message_visibility_limit is not None and recent_messages_count > 0:
update_first_visible_message_id(realm)
def update_first_visible_message_id(realm: Realm) -> None:
if realm.message_visibility_limit is None:
realm.first_visible_message_id = 0
else:
try:
first_visible_message_id = Message.objects.filter(sender__realm=realm).values('id').\
order_by('-id')[realm.message_visibility_limit - 1]["id"]
except IndexError:
first_visible_message_id = 0
realm.first_visible_message_id = first_visible_message_id
realm.save(update_fields=["first_visible_message_id"])
def get_recent_conversations_recipient_id(user_profile: UserProfile,
recipient_id: int,
sender_id: int) -> int:
"""Helper for doing lookups of the recipient_id that
get_recent_private_conversations would have used to record that
message in its data structure.
"""
my_recipient_id = user_profile.id
if recipient_id == my_recipient_id:
return UserProfile.objects.values_list('recipient_id', flat=True).get(id=sender_id)
return recipient_id
def get_recent_private_conversations(user_profile: UserProfile) -> Dict[int, Dict[str, Any]]:
"""This function uses some carefully optimized SQL queries, designed
to use the UserMessage index on private_messages. It is
significantly complicated by the fact that for 1:1 private
messages, we store the message against a recipient_id of whichever
user was the recipient, and thus for 1:1 private messages sent
directly to us, we need to look up the other user from the
sender_id on those messages. You'll see that pattern repeated
both here and also in zerver/lib/events.py.
Ideally, we would write these queries using Django, but even
without the UNION ALL, that seems to not be possible, because the
equivalent Django syntax (for the first part of this query):
message_data = UserMessage.objects.select_related("message__recipient_id").filter(
user_profile=user_profile,
).extra(
where=[UserMessage.where_private()]
).order_by("-message_id")[:1000].values(
"message__recipient_id").annotate(last_message_id=Max("message_id"))
does not properly nest the GROUP BY (from .annotate) with the slicing.
We return a dictionary structure for convenient modification
below; this structure is converted into its final form by
post_process.
"""
RECENT_CONVERSATIONS_LIMIT = 1000
recipient_map = {}
my_recipient_id = user_profile.recipient_id
query = '''
SELECT
subquery.recipient_id, MAX(subquery.message_id)
FROM (
(SELECT
um.message_id AS message_id,
m.recipient_id AS recipient_id
FROM
zerver_usermessage um
JOIN
zerver_message m
ON
um.message_id = m.id
WHERE
um.user_profile_id=%(user_profile_id)d AND
um.flags & 2048 <> 0 AND
m.recipient_id <> %(my_recipient_id)d
ORDER BY message_id DESC
LIMIT %(conversation_limit)d)
UNION ALL
(SELECT
m.id AS message_id,
sender_profile.recipient_id AS recipient_id
FROM
zerver_message m
JOIN
zerver_userprofile sender_profile
ON
m.sender_id = sender_profile.id
WHERE
m.recipient_id=%(my_recipient_id)d
ORDER BY message_id DESC
LIMIT %(conversation_limit)d)
) AS subquery
GROUP BY subquery.recipient_id
''' % dict(
user_profile_id=user_profile.id,
conversation_limit=RECENT_CONVERSATIONS_LIMIT,
my_recipient_id=my_recipient_id,
)
cursor = connection.cursor()
cursor.execute(query)
rows = cursor.fetchall()
cursor.close()
# The resulting rows will be (recipient_id, max_message_id)
# objects for all parties we've had recent (group?) private
# message conversations with, including PMs with yourself (those
# will generate an empty list of user_ids).
for recipient_id, max_message_id in rows:
recipient_map[recipient_id] = dict(
max_message_id=max_message_id,
user_ids=list(),
)
# Now we need to map all the recipient_id objects to lists of user IDs
for (recipient_id, user_profile_id) in Subscription.objects.filter(
recipient_id__in=recipient_map.keys()).exclude(
user_profile_id=user_profile.id).values_list(
"recipient_id", "user_profile_id"):
recipient_map[recipient_id]['user_ids'].append(user_profile_id)
# Sort to prevent test flakes and client bugs.
for rec in recipient_map.values():
rec['user_ids'].sort()
return recipient_map
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