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Include the state before the event in roomserver output (#143) 

* Include the state before the event in roomserver output

* Fix roomserver integration test

* Remove VisibilityEventIDs from the JSON

* More comments

* Remove spurious TODO
main
Mark Haines 2017-06-27 13:20:04 +01:00 committed by GitHub
parent 524475f8a3
commit 572f6c399d
3 changed files with 83 additions and 26 deletions
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3
src/github.com/matrix-org/dendrite/cmd/roomserver-integration-tests/main.go
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@ -340,7 +340,8 @@ func main() {
"state_key":"@richvdh:matrix.org",
"type":"m.room.member"
},
"VisibilityEventIDs":null,
"StateBeforeRemovesEventIDs":["$1463671339126270PnVwC:matrix.org"],
"StateBeforeAddsEventIDs":null,
"LatestEventIDs":["$1463671339126270PnVwC:matrix.org"],
"AddsStateEventIDs":["$1463671337126266wrSBX:matrix.org", "$1463671339126270PnVwC:matrix.org"],
"RemovesStateEventIDs":null,

41
src/github.com/matrix-org/dendrite/roomserver/api/output.go
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@ -19,12 +19,17 @@ import (
)
// An OutputRoomEvent is written when the roomserver receives a new event.
// It contains the full matrix room event and enough information for a
// consumer to construct the current state of the room and the state before the
// event.
//
// When we talk about state in a matrix room we are talking about the state
// after a list of events. The current state is the state after the latest
// event IDs in the room. The state before an event is the state after its
// prev_events.
type OutputRoomEvent struct {
// The JSON bytes of the event.
Event []byte
// The state event IDs needed to determine who can see this event.
// This can be used to tell which users to send the event to.
VisibilityEventIDs []string
// The latest events in the room after this event.
// This can be used to set the prev events for new events in the room.
// This also can be used to get the full current state after this event.
@ -40,9 +45,27 @@ type OutputRoomEvent struct {
// This is used by consumers to check if they can safely update their
// current state using the delta supplied in AddsStateEventIDs and
// RemovesStateEventIDs.
//
// If the LastSentEventID doesn't match what they were expecting it to be
// they can use the LatestEventIDs to request the full current state.
LastSentEventID string
// The state event IDs that are part of the state at the event, but not
// part of the current state. Together with the StateBeforeRemovesEventIDs
// this can be used to construct the state before the event from the
// current state. The StateBeforeAddsEventIDs and StateBeforeRemovesEventIDs
// delta is applied after the AddsStateEventIDs and RemovesStateEventIDs.
//
// Consumers need to know the state at each event in order to determine
// which users and servers are allowed to see the event. This information
// is needed to apply the history visibility rules and to tell which
// servers we need to push events to over federation.
//
// The state is given as a delta against the current state because they are
// usually either the same state, or differ by just a couple of events.
StateBeforeAddsEventIDs []string
// The state event IDs that are part of the current state, but not part
// of the state at the event.
StateBeforeRemovesEventIDs []string
}
// UnmarshalJSON implements json.Unmarshaller
@ -53,11 +76,12 @@ func (ore *OutputRoomEvent) UnmarshalJSON(data []byte) error {
// being base64 encoded which is the default for []byte.
var content struct {
Event *json.RawMessage
VisibilityEventIDs []string
LatestEventIDs []string
AddsStateEventIDs []string
RemovesStateEventIDs []string
LastSentEventID string
StateBeforeAddsEventIDs []string
StateBeforeRemovesEventIDs []string
}
if err := json.Unmarshal(data, &content); err != nil {
return err
@ -65,11 +89,12 @@ func (ore *OutputRoomEvent) UnmarshalJSON(data []byte) error {
if content.Event != nil {
ore.Event = []byte(*content.Event)
}
ore.VisibilityEventIDs = content.VisibilityEventIDs
ore.LatestEventIDs = content.LatestEventIDs
ore.AddsStateEventIDs = content.AddsStateEventIDs
ore.RemovesStateEventIDs = content.RemovesStateEventIDs
ore.LastSentEventID = content.LastSentEventID
ore.StateBeforeAddsEventIDs = content.StateBeforeAddsEventIDs
ore.StateBeforeRemovesEventIDs = content.StateBeforeRemovesEventIDs
return nil
}
@ -82,18 +107,20 @@ func (ore OutputRoomEvent) MarshalJSON() ([]byte, error) {
event := json.RawMessage(ore.Event)
content := struct {
Event *json.RawMessage
VisibilityEventIDs []string
LatestEventIDs []string
AddsStateEventIDs []string
RemovesStateEventIDs []string
LastSentEventID string
StateBeforeAddsEventIDs []string
StateBeforeRemovesEventIDs []string
}{
Event: &event,
VisibilityEventIDs: ore.VisibilityEventIDs,
LatestEventIDs: ore.LatestEventIDs,
AddsStateEventIDs: ore.AddsStateEventIDs,
RemovesStateEventIDs: ore.RemovesStateEventIDs,
LastSentEventID: ore.LastSentEventID,
StateBeforeAddsEventIDs: ore.StateBeforeAddsEventIDs,
StateBeforeRemovesEventIDs: ore.StateBeforeRemovesEventIDs,
}
return json.Marshal(&content)
}

35
src/github.com/matrix-org/dendrite/roomserver/input/latest_events.go
View File

@ -20,6 +20,7 @@ import (
"github.com/matrix-org/dendrite/roomserver/state"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
)
// updateLatestEvents updates the list of latest events for this room in the database and writes the
@ -110,6 +111,13 @@ func doUpdateLatestEvents(
return err
}
stateBeforeEventRemoves, stateBeforeEventAdds, err := state.DifferenceBetweeenStateSnapshots(
db, newStateNID, stateAtEvent.BeforeStateSnapshotNID,
)
if err != nil {
return err
}
// Send the event to the output logs.
// We do this inside the database transaction to ensure that we only mark an event as sent if we sent it.
// (n.b. this means that it's possible that the same event will be sent twice if the transaction fails but
@ -118,7 +126,10 @@ func doUpdateLatestEvents(
// send the event asynchronously but we would need to ensure that 1) the events are written to the log in
// the correct order, 2) that pending writes are resent across restarts. In order to avoid writing all the
// necessary bookkeeping we'll keep the event sending synchronous for now.
if err = writeEvent(db, ow, lastEventIDSent, event, newLatest, removed, added); err != nil {
if err = writeEvent(
db, ow, lastEventIDSent, event, newLatest, removed, added,
stateBeforeEventRemoves, stateBeforeEventAdds,
); err != nil {
return err
}
@ -170,6 +181,7 @@ func writeEvent(
db RoomEventDatabase, ow OutputRoomEventWriter, lastEventIDSent string,
event gomatrixserverlib.Event, latest []types.StateAtEventAndReference,
removed, added []types.StateEntry,
stateBeforeEventRemoves, stateBeforeEventAdds []types.StateEntry,
) error {
latestEventIDs := make([]string, len(latest))
@ -190,6 +202,13 @@ func writeEvent(
for _, entry := range removed {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
for _, entry := range stateBeforeEventRemoves {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
for _, entry := range stateBeforeEventAdds {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
stateEventNIDs = stateEventNIDs[:util.SortAndUnique(eventNIDSorter(stateEventNIDs))]
eventIDMap, err := db.EventIDs(stateEventNIDs)
if err != nil {
return err
@ -200,7 +219,17 @@ func writeEvent(
for _, entry := range removed {
ore.RemovesStateEventIDs = append(ore.RemovesStateEventIDs, eventIDMap[entry.EventNID])
}
// TODO: Fill out VisibilityStateIDs
for _, entry := range stateBeforeEventRemoves {
ore.StateBeforeRemovesEventIDs = append(ore.StateBeforeRemovesEventIDs, eventIDMap[entry.EventNID])
}
for _, entry := range stateBeforeEventAdds {
ore.StateBeforeAddsEventIDs = append(ore.StateBeforeAddsEventIDs, eventIDMap[entry.EventNID])
}
return ow.WriteOutputRoomEvent(ore)
}
type eventNIDSorter []types.EventNID
func (s eventNIDSorter) Len() int { return len(s) }
func (s eventNIDSorter) Less(i, j int) bool { return s[i] < s[j] }
func (s eventNIDSorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }