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This commit is contained in:
Kegan Dougal 2017-04-18 17:49:13 +01:00
parent 95f7fef997
commit f00b7723ca
1 changed files with 4 additions and 4 deletions
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8
src/github.com/matrix-org/dendrite/syncserver/sync/requestpool.go
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@ -171,10 +171,10 @@ func (rp *RequestPool) currentSyncForUser(req syncRequest) (*types.Response, err
//
// The /sync response returns the most recent timeline events and the state of the room at the start of the timeline, for each room.
//
// Aside: There are 2 ways that a server can advance state events e.g from D' to D'':
// 1) by a tuple of (event type, state key)
// 2) by the state conflict resolution algorithm
// Dendrite MUST do this by 2), and that is represented by the add_state_ids and remove_state_ids that
// Servers advance state events (e.g from D' to D'') based on the state conflict resolution algorithm.
// You might think that you could advance the current state by just updating the entry for the (event type, state_key) tuple
// for each state event, but this state can diverge from the state calculated using the state conflict resolution algorithm.
// The correct advancement for state events is represented by the add_state_ids and remove_state_ids that
// are in OutputRoomEvents from the room server.
// This version of dendrite uses very simple indexing to calculate room state at various points.