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Merge pull request #416 from matrix-org/markjh/idempotent_state

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Make state updates in the C+S API idempotent
This commit is contained in:
Mark Haines 2015-12-02 17:14:45 +00:00
commit 748c0f5efa
1 changed files with 12 additions and 0 deletions
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12
synapse/handlers/message.py
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@ -26,6 +26,8 @@ from synapse.types import UserID, RoomStreamToken, StreamToken
from ._base import BaseHandler
from canonicaljson import encode_canonical_json
import logging
logger = logging.getLogger(__name__)
@ -213,6 +215,16 @@ class MessageHandler(BaseHandler):
builder=builder,
)
if event.is_state():
prev_state = context.current_state.get((event.type, event.state_key))
if prev_state and event.user_id == prev_state.user_id:
prev_content = encode_canonical_json(prev_state.content)
next_content = encode_canonical_json(event.content)
if prev_content == next_content:
# Duplicate suppression for state updates with same sender
# and content.
defer.returnValue(prev_state)
if event.type == EventTypes.Member:
member_handler = self.hs.get_handlers().room_member_handler
yield member_handler.change_membership(event, context, is_guest=is_guest)