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synapse.state docs.

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This commit is contained in:
Erik Johnston 2014-11-11 17:45:46 +00:00
parent 3db2c0d43e
commit 997ed151db
1 changed files with 35 additions and 0 deletions
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35
synapse/state.py
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@ -46,6 +46,24 @@ class StateHandler(object):
@defer.inlineCallbacks
@log_function
def annotate_event_with_state(self, event, old_state=None):
""" Annotates the event with the current state events as of that event.
This method adds three new attributes to the event:
* `state_events`: The state up to and including the event. Encoded
as a dict mapping tuple (type, state_key) -> event.
* `old_state_events`: The state up to, but excluding, the event.
Encoded similarly as `state_events`.
* `state_group`: If there is an existing state group that can be
used, then return that. Otherwise return `None`. See state
storage for more information.
If the argument `old_state` is given (in the form of a list of
events), then they are used as a the values for `old_state_events` and
the value for `state_events` is generated from it. `state_group` is
set to None.
This needs to be called before persisting the event.
"""
yield run_on_reactor()
if old_state:
@ -92,6 +110,16 @@ class StateHandler(object):
@defer.inlineCallbacks
def get_current_state(self, room_id, event_type=None, state_key=""):
""" Returns the current state for the room as a list. This is done by
calling `get_latest_events_in_room` to get the leading edges of the
event graph and then resolving any of the state conflicts.
This is equivalent to getting the state of an event that were to send
next before receiving any new events.
If `event_type` is specified, then the method returns only the one
event (or None) with that `event_type` and `state_key`.
"""
events = yield self.store.get_latest_events_in_room(room_id)
event_ids = [
@ -110,6 +138,13 @@ class StateHandler(object):
@defer.inlineCallbacks
@log_function
def resolve_state_groups(self, event_ids):
""" Given a list of event_ids this method fetches the state at each
event, resolves conflicts between them and returns them.
Return format is a tuple: (`state_group`, `state_events`), where the
first is the name of a state group if one and only one is involved,
otherwise `None`.
"""
state_groups = yield self.store.get_state_groups(
event_ids
)