def get_messages_backend(request: HttpRequest, user_profile: UserProfile,
anchor_val: Optional[str]=REQ(
'anchor', str_validator=check_string, default=None),
num_before: int=REQ(converter=to_non_negative_int),
num_after: int=REQ(converter=to_non_negative_int),
narrow: OptionalNarrowListT=REQ('narrow', converter=narrow_parameter, default=None),
use_first_unread_anchor_val: bool=REQ('use_first_unread_anchor',
validator=check_bool, default=False),
client_gravatar: bool=REQ(validator=check_bool, default=False),
apply_markdown: bool=REQ(validator=check_bool, default=True)) -> HttpResponse:
anchor = parse_anchor_value(anchor_val, use_first_unread_anchor_val)
if num_before + num_after > MAX_MESSAGES_PER_FETCH:
return json_error(_("Too many messages requested (maximum {}).").format(
MAX_MESSAGES_PER_FETCH,
))
if user_profile.realm.email_address_visibility != Realm.EMAIL_ADDRESS_VISIBILITY_EVERYONE:
# If email addresses are only available to administrators,
# clients cannot compute gravatars, so we force-set it to false.
client_gravatar = False
include_history = ok_to_include_history(narrow, user_profile)
if include_history:
# The initial query in this case doesn't use `zerver_usermessage`,
# and isn't yet limited to messages the user is entitled to see!
#
# This is OK only because we've made sure this is a narrow that
# will cause us to limit the query appropriately later.
# See `ok_to_include_history` for details.
need_message = True
need_user_message = False
elif narrow is None:
# We need to limit to messages the user has received, but we don't actually
# need any fields from Message
need_message = False
need_user_message = True
else:
need_message = True
need_user_message = True
query, inner_msg_id_col = get_base_query_for_search(
user_profile=user_profile,
need_message=need_message,
need_user_message=need_user_message,
)
query, is_search = add_narrow_conditions(
user_profile=user_profile,
inner_msg_id_col=inner_msg_id_col,
query=query,
narrow=narrow,
)
if narrow is not None:
# Add some metadata to our logging data for narrows
verbose_operators = []
for term in narrow:
if term['operator'] == "is":
verbose_operators.append("is:" + term['operand'])
else:
verbose_operators.append(term['operator'])
request._log_data['extra'] = "[{}]".format(",".join(verbose_operators))
sa_conn = get_sqlalchemy_connection()
if anchor is None:
# The use_first_unread_anchor code path
anchor = find_first_unread_anchor(
sa_conn,
user_profile,
narrow,
)
anchored_to_left = (anchor == 0)
# Set value that will be used to short circuit the after_query
# altogether and avoid needless conditions in the before_query.
anchored_to_right = (anchor >= LARGER_THAN_MAX_MESSAGE_ID)
if anchored_to_right:
num_after = 0
first_visible_message_id = get_first_visible_message_id(user_profile.realm)
query = limit_query_to_range(
query=query,
num_before=num_before,
num_after=num_after,
anchor=anchor,
anchored_to_left=anchored_to_left,
anchored_to_right=anchored_to_right,
id_col=inner_msg_id_col,
first_visible_message_id=first_visible_message_id,
)
main_query = alias(query)
query = select(main_query.c, None, main_query).order_by(column("message_id").asc())
# This is a hack to tag the query we use for testing
query = query.prefix_with("/* get_messages */")
rows = list(sa_conn.execute(query).fetchall())
query_info = post_process_limited_query(
rows=rows,
num_before=num_before,
num_after=num_after,
anchor=anchor,
anchored_to_left=anchored_to_left,
anchored_to_right=anchored_to_right,
first_visible_message_id=first_visible_message_id,
)
rows = query_info['rows']
# The following is a little messy, but ensures that the code paths
# are similar regardless of the value of include_history. The
# 'user_messages' dictionary maps each message to the user's
# UserMessage object for that message, which we will attach to the
# rendered message dict before returning it. We attempt to
# bulk-fetch rendered message dicts from remote cache using the
# 'messages' list.
message_ids: List[int] = []
user_message_flags: Dict[int, List[str]] = {}
if include_history:
message_ids = [row[0] for row in rows]
# TODO: This could be done with an outer join instead of two queries
um_rows = UserMessage.objects.filter(user_profile=user_profile,
message__id__in=message_ids)
user_message_flags = {um.message_id: um.flags_list() for um in um_rows}
for message_id in message_ids:
if message_id not in user_message_flags:
user_message_flags[message_id] = ["read", "historical"]
else:
for row in rows:
message_id = row[0]
flags = row[1]
user_message_flags[message_id] = UserMessage.flags_list_for_flags(flags)
message_ids.append(message_id)
search_fields: Dict[int, Dict[str, str]] = dict()
if is_search:
for row in rows:
message_id = row[0]
(topic_name, rendered_content, content_matches, topic_matches) = row[-4:]
try:
search_fields[message_id] = get_search_fields(rendered_content, topic_name,
content_matches, topic_matches)
except UnicodeDecodeError as err: # nocoverage
# No coverage for this block since it should be
# impossible, and we plan to remove it once we've
# debugged the case that makes it happen.
raise Exception(str(err), message_id, narrow)
message_list = messages_for_ids(
message_ids=message_ids,
user_message_flags=user_message_flags,
search_fields=search_fields,
apply_markdown=apply_markdown,
client_gravatar=client_gravatar,
allow_edit_history=user_profile.realm.allow_edit_history,
)
statsd.incr('loaded_old_messages', len(message_list))
ret = dict(
messages=message_list,
result='success',
msg='',
found_anchor=query_info['found_anchor'],
found_oldest=query_info['found_oldest'],
found_newest=query_info['found_newest'],
history_limited=query_info['history_limited'],
anchor=anchor,
)
return json_success(ret)
def flags_list(self) -> List[str]:
return UserMessage.flags_list_for_flags(self.flags)
