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Refactor search code to reduce function size. (#11991)

Browse source 
Splits the search code into a few logical functions instead of a single
unreadable function.

There are also a few additional changes for readability.

After refactoring it was clear to see there were some unused and
unnecessary variables, which were simplified.
This commit is contained in:
Patrick Cloke 2022-02-15 08:47:05 -05:00 committed by GitHub
parent 45f45404de
commit e44f91d678
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3 changed files with 436 additions and 227 deletions
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1
changelog.d/11991.misc Normal file
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@ -0,0 +1 @@
Refactor the search code for improved readability.

645
synapse/handlers/search.py
View file

@ -14,8 +14,9 @@
import itertools
import logging
from typing import TYPE_CHECKING, Dict, Iterable, List, Optional
from typing import TYPE_CHECKING, Collection, Dict, Iterable, List, Optional, Set, Tuple
import attr
from unpaddedbase64 import decode_base64, encode_base64
from synapse.api.constants import EventTypes, Membership
@ -32,6 +33,20 @@ if TYPE_CHECKING:
logger = logging.getLogger(__name__)
@attr.s(slots=True, frozen=True, auto_attribs=True)
class _SearchResult:
# The count of results.
count: int
# A mapping of event ID to the rank of that event.
rank_map: Dict[str, int]
# A list of the resulting events.
allowed_events: List[EventBase]
# A map of room ID to results.
room_groups: Dict[str, JsonDict]
# A set of event IDs to highlight.
highlights: Set[str]
class SearchHandler:
def __init__(self, hs: "HomeServer"):
self.store = hs.get_datastore()
@ -100,7 +115,7 @@ class SearchHandler:
"""Performs a full text search for a user.
Args:
user
user: The user performing the search.
content: Search parameters
batch: The next_batch parameter. Used for pagination.
@ -156,6 +171,8 @@ class SearchHandler:
# Include context around each event?
event_context = room_cat.get("event_context", None)
before_limit = after_limit = None
include_profile = False
# Group results together? May allow clients to paginate within a
# group
@ -182,6 +199,73 @@ class SearchHandler:
% (set(group_keys) - {"room_id", "sender"},),
)
return await self._search(
user,
batch_group,
batch_group_key,
batch_token,
search_term,
keys,
filter_dict,
order_by,
include_state,
group_keys,
event_context,
before_limit,
after_limit,
include_profile,
)
async def _search(
self,
user: UserID,
batch_group: Optional[str],
batch_group_key: Optional[str],
batch_token: Optional[str],
search_term: str,
keys: List[str],
filter_dict: JsonDict,
order_by: str,
include_state: bool,
group_keys: List[str],
event_context: Optional[bool],
before_limit: Optional[int],
after_limit: Optional[int],
include_profile: bool,
) -> JsonDict:
"""Performs a full text search for a user.
Args:
user: The user performing the search.
batch_group: Pagination information.
batch_group_key: Pagination information.
batch_token: Pagination information.
search_term: Search term to search for
keys: List of keys to search in, currently supports
"content.body", "content.name", "content.topic"
filter_dict: The JSON to build a filter out of.
order_by: How to order the results. Valid values ore "rank" and "recent".
include_state: True if the state of the room at each result should
be included.
group_keys: A list of ways to group the results. Valid values are
"room_id" and "sender".
event_context: True to include contextual events around results.
before_limit:
The number of events before a result to include as context.
Only used if event_context is True.
after_limit:
The number of events after a result to include as context.
Only used if event_context is True.
include_profile: True if historical profile information should be
included in the event context.
Only used if event_context is True.
Returns:
dict to be returned to the client with results of search
"""
search_filter = Filter(self.hs, filter_dict)
# TODO: Search through left rooms too
@ -216,209 +300,57 @@ class SearchHandler:
}
}
rank_map = {} # event_id -> rank of event
allowed_events = []
# Holds result of grouping by room, if applicable
room_groups: Dict[str, JsonDict] = {}
# Holds result of grouping by sender, if applicable
sender_group: Dict[str, JsonDict] = {}
# Holds the next_batch for the entire result set if one of those exists
global_next_batch = None
highlights = set()
count = None
sender_group: Optional[Dict[str, JsonDict]]
if order_by == "rank":
search_result = await self.store.search_msgs(room_ids, search_term, keys)
count = search_result["count"]
if search_result["highlights"]:
highlights.update(search_result["highlights"])
results = search_result["results"]
rank_map.update({r["event"].event_id: r["rank"] for r in results})
filtered_events = await search_filter.filter([r["event"] for r in results])
events = await filter_events_for_client(
self.storage, user.to_string(), filtered_events
search_result, sender_group = await self._search_by_rank(
user, room_ids, search_term, keys, search_filter
)
events.sort(key=lambda e: -rank_map[e.event_id])
allowed_events = events[: search_filter.limit]
for e in allowed_events:
rm = room_groups.setdefault(
e.room_id, {"results": [], "order": rank_map[e.event_id]}
)
rm["results"].append(e.event_id)
s = sender_group.setdefault(
e.sender, {"results": [], "order": rank_map[e.event_id]}
)
s["results"].append(e.event_id)
# Unused return values for rank search.
global_next_batch = None
elif order_by == "recent":
room_events: List[EventBase] = []
i = 0
pagination_token = batch_token
# We keep looping and we keep filtering until we reach the limit
# or we run out of things.
# But only go around 5 times since otherwise synapse will be sad.
while len(room_events) < search_filter.limit and i < 5:
i += 1
search_result = await self.store.search_rooms(
room_ids,
search_term,
keys,
search_filter.limit * 2,
pagination_token=pagination_token,
)
if search_result["highlights"]:
highlights.update(search_result["highlights"])
count = search_result["count"]
results = search_result["results"]
results_map = {r["event"].event_id: r for r in results}
rank_map.update({r["event"].event_id: r["rank"] for r in results})
filtered_events = await search_filter.filter(
[r["event"] for r in results]
)
events = await filter_events_for_client(
self.storage, user.to_string(), filtered_events
)
room_events.extend(events)
room_events = room_events[: search_filter.limit]
if len(results) < search_filter.limit * 2:
pagination_token = None
break
else:
pagination_token = results[-1]["pagination_token"]
for event in room_events:
group = room_groups.setdefault(event.room_id, {"results": []})
group["results"].append(event.event_id)
if room_events and len(room_events) >= search_filter.limit:
last_event_id = room_events[-1].event_id
pagination_token = results_map[last_event_id]["pagination_token"]
# We want to respect the given batch group and group keys so
# that if people blindly use the top level `next_batch` token
# it returns more from the same group (if applicable) rather
# than reverting to searching all results again.
if batch_group and batch_group_key:
global_next_batch = encode_base64(
(
"%s\n%s\n%s"
% (batch_group, batch_group_key, pagination_token)
).encode("ascii")
)
else:
global_next_batch = encode_base64(
("%s\n%s\n%s" % ("all", "", pagination_token)).encode("ascii")
)
for room_id, group in room_groups.items():
group["next_batch"] = encode_base64(
("%s\n%s\n%s" % ("room_id", room_id, pagination_token)).encode(
"ascii"
)
)
allowed_events.extend(room_events)
search_result, global_next_batch = await self._search_by_recent(
user,
room_ids,
search_term,
keys,
search_filter,
batch_group,
batch_group_key,
batch_token,
)
# Unused return values for recent search.
sender_group = None
else:
# We should never get here due to the guard earlier.
raise NotImplementedError()
logger.info("Found %d events to return", len(allowed_events))
logger.info("Found %d events to return", len(search_result.allowed_events))
# If client has asked for "context" for each event (i.e. some surrounding
# events and state), fetch that
if event_context is not None:
now_token = self.hs.get_event_sources().get_current_token()
# Note that before and after limit must be set in this case.
assert before_limit is not None
assert after_limit is not None
contexts = {}
for event in allowed_events:
res = await self.store.get_events_around(
event.room_id, event.event_id, before_limit, after_limit
)
logger.info(
"Context for search returned %d and %d events",
len(res.events_before),
len(res.events_after),
)
events_before = await filter_events_for_client(
self.storage, user.to_string(), res.events_before
)
events_after = await filter_events_for_client(
self.storage, user.to_string(), res.events_after
)
context = {
"events_before": events_before,
"events_after": events_after,
"start": await now_token.copy_and_replace(
"room_key", res.start
).to_string(self.store),
"end": await now_token.copy_and_replace(
"room_key", res.end
).to_string(self.store),
}
if include_profile:
senders = {
ev.sender
for ev in itertools.chain(events_before, [event], events_after)
}
if events_after:
last_event_id = events_after[-1].event_id
else:
last_event_id = event.event_id
state_filter = StateFilter.from_types(
[(EventTypes.Member, sender) for sender in senders]
)
state = await self.state_store.get_state_for_event(
last_event_id, state_filter
)
context["profile_info"] = {
s.state_key: {
"displayname": s.content.get("displayname", None),
"avatar_url": s.content.get("avatar_url", None),
}
for s in state.values()
if s.type == EventTypes.Member and s.state_key in senders
}
contexts[event.event_id] = context
contexts = await self._calculate_event_contexts(
user,
search_result.allowed_events,
before_limit,
after_limit,
include_profile,
)
else:
contexts = {}
# TODO: Add a limit
time_now = self.clock.time_msec()
state_results = {}
if include_state:
for room_id in {e.room_id for e in search_result.allowed_events}:
state = await self.state_handler.get_current_state(room_id)
state_results[room_id] = list(state.values())
aggregations = None
if self._msc3666_enabled:
@ -432,11 +364,16 @@ class SearchHandler:
for context in contexts.values()
),
# The returned events.
allowed_events,
search_result.allowed_events,
),
user.to_string(),
)
# We're now about to serialize the events. We should not make any
# blocking calls after this. Otherwise, the 'age' will be wrong.
time_now = self.clock.time_msec()
for context in contexts.values():
context["events_before"] = self._event_serializer.serialize_events(
context["events_before"], time_now, bundle_aggregations=aggregations # type: ignore[arg-type]
@ -445,44 +382,33 @@ class SearchHandler:
context["events_after"], time_now, bundle_aggregations=aggregations # type: ignore[arg-type]
)
state_results = {}
if include_state:
for room_id in {e.room_id for e in allowed_events}:
state = await self.state_handler.get_current_state(room_id)
state_results[room_id] = list(state.values())
results = [
{
"rank": search_result.rank_map[e.event_id],
"result": self._event_serializer.serialize_event(
e, time_now, bundle_aggregations=aggregations
),
"context": contexts.get(e.event_id, {}),
}
for e in search_result.allowed_events
]
# We're now about to serialize the events. We should not make any
# blocking calls after this. Otherwise the 'age' will be wrong
results = []
for e in allowed_events:
results.append(
{
"rank": rank_map[e.event_id],
"result": self._event_serializer.serialize_event(
e, time_now, bundle_aggregations=aggregations
),
"context": contexts.get(e.event_id, {}),
}
)
rooms_cat_res = {
rooms_cat_res: JsonDict = {
"results": results,
"count": count,
"highlights": list(highlights),
"count": search_result.count,
"highlights": list(search_result.highlights),
}
if state_results:
s = {}
for room_id, state_events in state_results.items():
s[room_id] = self._event_serializer.serialize_events(
state_events, time_now
)
rooms_cat_res["state"] = {
room_id: self._event_serializer.serialize_events(state_events, time_now)
for room_id, state_events in state_results.items()
}
rooms_cat_res["state"] = s
if room_groups and "room_id" in group_keys:
rooms_cat_res.setdefault("groups", {})["room_id"] = room_groups
if search_result.room_groups and "room_id" in group_keys:
rooms_cat_res.setdefault("groups", {})[
"room_id"
] = search_result.room_groups
if sender_group and "sender" in group_keys:
rooms_cat_res.setdefault("groups", {})["sender"] = sender_group
@ -491,3 +417,282 @@ class SearchHandler:
rooms_cat_res["next_batch"] = global_next_batch
return {"search_categories": {"room_events": rooms_cat_res}}
async def _search_by_rank(
self,
user: UserID,
room_ids: Collection[str],
search_term: str,
keys: Iterable[str],
search_filter: Filter,
) -> Tuple[_SearchResult, Dict[str, JsonDict]]:
"""
Performs a full text search for a user ordering by rank.
Args:
user: The user performing the search.
room_ids: List of room ids to search in
search_term: Search term to search for
keys: List of keys to search in, currently supports
"content.body", "content.name", "content.topic"
search_filter: The event filter to use.
Returns:
A tuple of:
The search results.
A map of sender ID to results.
"""
rank_map = {} # event_id -> rank of event
# Holds result of grouping by room, if applicable
room_groups: Dict[str, JsonDict] = {}
# Holds result of grouping by sender, if applicable
sender_group: Dict[str, JsonDict] = {}
search_result = await self.store.search_msgs(room_ids, search_term, keys)
if search_result["highlights"]:
highlights = search_result["highlights"]
else:
highlights = set()
results = search_result["results"]
# event_id -> rank of event
rank_map = {r["event"].event_id: r["rank"] for r in results}
filtered_events = await search_filter.filter([r["event"] for r in results])
events = await filter_events_for_client(
self.storage, user.to_string(), filtered_events
)
events.sort(key=lambda e: -rank_map[e.event_id])
allowed_events = events[: search_filter.limit]
for e in allowed_events:
rm = room_groups.setdefault(
e.room_id, {"results": [], "order": rank_map[e.event_id]}
)
rm["results"].append(e.event_id)
s = sender_group.setdefault(
e.sender, {"results": [], "order": rank_map[e.event_id]}
)
s["results"].append(e.event_id)
return (
_SearchResult(
search_result["count"],
rank_map,
allowed_events,
room_groups,
highlights,
),
sender_group,
)
async def _search_by_recent(
self,
user: UserID,
room_ids: Collection[str],
search_term: str,
keys: Iterable[str],
search_filter: Filter,
batch_group: Optional[str],
batch_group_key: Optional[str],
batch_token: Optional[str],
) -> Tuple[_SearchResult, Optional[str]]:
"""
Performs a full text search for a user ordering by recent.
Args:
user: The user performing the search.
room_ids: List of room ids to search in
search_term: Search term to search for
keys: List of keys to search in, currently supports
"content.body", "content.name", "content.topic"
search_filter: The event filter to use.
batch_group: Pagination information.
batch_group_key: Pagination information.
batch_token: Pagination information.
Returns:
A tuple of:
The search results.
Optionally, a pagination token.
"""
rank_map = {} # event_id -> rank of event
# Holds result of grouping by room, if applicable
room_groups: Dict[str, JsonDict] = {}
# Holds the next_batch for the entire result set if one of those exists
global_next_batch = None
highlights = set()
room_events: List[EventBase] = []
i = 0
pagination_token = batch_token
# We keep looping and we keep filtering until we reach the limit
# or we run out of things.
# But only go around 5 times since otherwise synapse will be sad.
while len(room_events) < search_filter.limit and i < 5:
i += 1
search_result = await self.store.search_rooms(
room_ids,
search_term,
keys,
search_filter.limit * 2,
pagination_token=pagination_token,
)
if search_result["highlights"]:
highlights.update(search_result["highlights"])
count = search_result["count"]
results = search_result["results"]
results_map = {r["event"].event_id: r for r in results}
rank_map.update({r["event"].event_id: r["rank"] for r in results})
filtered_events = await search_filter.filter([r["event"] for r in results])
events = await filter_events_for_client(
self.storage, user.to_string(), filtered_events
)
room_events.extend(events)
room_events = room_events[: search_filter.limit]
if len(results) < search_filter.limit * 2:
break
else:
pagination_token = results[-1]["pagination_token"]
for event in room_events:
group = room_groups.setdefault(event.room_id, {"results": []})
group["results"].append(event.event_id)
if room_events and len(room_events) >= search_filter.limit:
last_event_id = room_events[-1].event_id
pagination_token = results_map[last_event_id]["pagination_token"]
# We want to respect the given batch group and group keys so
# that if people blindly use the top level `next_batch` token
# it returns more from the same group (if applicable) rather
# than reverting to searching all results again.
if batch_group and batch_group_key:
global_next_batch = encode_base64(
(
"%s\n%s\n%s" % (batch_group, batch_group_key, pagination_token)
).encode("ascii")
)
else:
global_next_batch = encode_base64(
("%s\n%s\n%s" % ("all", "", pagination_token)).encode("ascii")
)
for room_id, group in room_groups.items():
group["next_batch"] = encode_base64(
("%s\n%s\n%s" % ("room_id", room_id, pagination_token)).encode(
"ascii"
)
)
return (
_SearchResult(count, rank_map, room_events, room_groups, highlights),
global_next_batch,
)
async def _calculate_event_contexts(
self,
user: UserID,
allowed_events: List[EventBase],
before_limit: int,
after_limit: int,
include_profile: bool,
) -> Dict[str, JsonDict]:
"""
Calculates the contextual events for any search results.
Args:
user: The user performing the search.
allowed_events: The search results.
before_limit:
The number of events before a result to include as context.
after_limit:
The number of events after a result to include as context.
include_profile: True if historical profile information should be
included in the event context.
Returns:
A map of event ID to contextual information.
"""
now_token = self.hs.get_event_sources().get_current_token()
contexts = {}
for event in allowed_events:
res = await self.store.get_events_around(
event.room_id, event.event_id, before_limit, after_limit
)
logger.info(
"Context for search returned %d and %d events",
len(res.events_before),
len(res.events_after),
)
events_before = await filter_events_for_client(
self.storage, user.to_string(), res.events_before
)
events_after = await filter_events_for_client(
self.storage, user.to_string(), res.events_after
)
context = {
"events_before": events_before,
"events_after": events_after,
"start": await now_token.copy_and_replace(
"room_key", res.start
).to_string(self.store),
"end": await now_token.copy_and_replace("room_key", res.end).to_string(
self.store
),
}
if include_profile:
senders = {
ev.sender
for ev in itertools.chain(events_before, [event], events_after)
}
if events_after:
last_event_id = events_after[-1].event_id
else:
last_event_id = event.event_id
state_filter = StateFilter.from_types(
[(EventTypes.Member, sender) for sender in senders]
)
state = await self.state_store.get_state_for_event(
last_event_id, state_filter
)
context["profile_info"] = {
s.state_key: {
"displayname": s.content.get("displayname", None),
"avatar_url": s.content.get("avatar_url", None),
}
for s in state.values()
if s.type == EventTypes.Member and s.state_key in senders
}
contexts[event.event_id] = context
return contexts

17
synapse/storage/databases/main/search.py
View file

@ -28,6 +28,7 @@ from synapse.storage.database import (
)
from synapse.storage.databases.main.events_worker import EventRedactBehaviour
from synapse.storage.engines import PostgresEngine, Sqlite3Engine
from synapse.types import JsonDict
if TYPE_CHECKING:
from synapse.server import HomeServer
@ -381,17 +382,19 @@ class SearchStore(SearchBackgroundUpdateStore):
):
super().__init__(database, db_conn, hs)
async def search_msgs(self, room_ids, search_term, keys):
async def search_msgs(
self, room_ids: Collection[str], search_term: str, keys: Iterable[str]
) -> JsonDict:
"""Performs a full text search over events with given keys.
Args:
room_ids (list): List of room ids to search in
search_term (str): Search term to search for
keys (list): List of keys to search in, currently supports
room_ids: List of room ids to search in
search_term: Search term to search for
keys: List of keys to search in, currently supports
"content.body", "content.name", "content.topic"
Returns:
list of dicts
Dictionary of results
"""
clauses = []
@ -499,10 +502,10 @@ class SearchStore(SearchBackgroundUpdateStore):
self,
room_ids: Collection[str],
search_term: str,
keys: List[str],
keys: Iterable[str],
limit,
pagination_token: Optional[str] = None,
) -> List[dict]:
) -> JsonDict:
"""Performs a full text search over events with given keys.
Args: