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Document StateStore and use transactions

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This commit is contained in:
Erik Johnston 2014-11-12 14:33:34 +00:00
parent 58c0ef90c9
commit e24d5cb97d
1 changed files with 55 additions and 27 deletions
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46
synapse/storage/state.py
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@ -14,16 +14,38 @@
# limitations under the License.
from ._base import SQLBaseStore
from twisted.internet import defer
class StateStore(SQLBaseStore):
""" Keeps track of the state at a given event.
This is done by the concept of `state groups`. Every event is a assigned
a state group (identified by an arbitrary string), which references a
collection of state events. The current state of an event is then the
collection of state events referenced by the event's state group.
Hence, every change in the current state causes a new state group to be
generated. However, if no change happens (e.g., if we get a message event
with only one parent it inherits the state group from its parent.)
There are three tables:
* `state_groups`: Stores group name, first event with in the group and
room id.
* `event_to_state_groups`: Maps events to state groups.
* `state_groups_state`: Maps state group to state events.
"""
@defer.inlineCallbacks
def get_state_groups(self, event_ids):
""" Get the state groups for the given list of event_ids
The return value is a dict mapping group names to lists of events.
"""
def f(txn):
groups = set()
for event_id in event_ids:
group = yield self._simple_select_one_onecol(
group = self._simple_select_one_onecol_txn(
txn,
table="event_to_state_groups",
keyvalues={"event_id": event_id},
retcol="state_group",
@ -34,23 +56,29 @@ class StateStore(SQLBaseStore):
res = {}
for group in groups:
state_ids = yield self._simple_select_onecol(
state_ids = self._simple_select_onecol_txn(
txn,
table="state_groups_state",
keyvalues={"state_group": group},
retcol="event_id",
)
state = []
for state_id in state_ids:
s = yield self.get_event(
state_id,
allow_none=True,
s = self._get_events_txn(
txn,
[state_id],
)
if s:
state.append(s)
state.extend(s)
res[group] = state
defer.returnValue(res)
return res
return self.runInteraction(
"get_state_groups",
f,
)
def store_state_groups(self, event):
return self.runInteraction(