Add tables for tracking the state of invites to the room server. (#165)

* Storage functions for invite events

* Add table for tracking membership state

* More stuff

* More stuff

* Use utility methods from gomatrixserverlib, rather than reimplementing them

* More stuff

* Return string rather than pointer to string

* Update gomatrixserverlib

* Use HTTP API for roomserver input.

* Use synchronous HTTP API for writing events to the roomserver

* Remove unused config for kafka topic

* Add new output types to roomserver for invites

* Write membership updates

* Separate filtering from pairing up changes in membershipChanges

* Fix SQL

* Fix SQL

* Namespace the tables

* Fix SQL

* Use clearer names for some of the variables

* Rename senderID for consistency

* Restructure update membership

* Comments

* More comment

* Fix SQL

* More comments

* Assign state keys inside the transaction

* Comment on the purpose of the latestEventsUpdater

* Comment on the purpose of updateMembership

* Remove duplicate fields from stateChange

* Attempt to rewrite comment in 'english'

* More comments

* Fix comment

* Comment

* more comments
This commit is contained in:
Mark Haines 2017-08-08 16:38:03 +01:00 committed by GitHub
parent c35803c9d8
commit 2071387f3c
11 changed files with 900 additions and 106 deletions

View File

@ -21,8 +21,14 @@ import (
// An OutputType is a type of roomserver output.
type OutputType string
// OutputTypeNewRoomEvent indicates that the event is an OutputNewRoomEvent
const OutputTypeNewRoomEvent OutputType = "new_room_event"
const (
// OutputTypeNewRoomEvent indicates that the event is an OutputNewRoomEvent
OutputTypeNewRoomEvent OutputType = "new_room_event"
// OutputTypeNewInviteEvent indicates that the event is an OutputNewInviteEvent
OutputTypeNewInviteEvent OutputType = "new_invite_event"
// OutputTypeRetireInviteEvent indicates that the event is an OutputRetireInviteEvent
OutputTypeRetireInviteEvent OutputType = "retire_invite_event"
)
// An OutputEvent is an entry in the roomserver output kafka log.
// Consumers should check the type field when consuming this event.
@ -31,6 +37,10 @@ type OutputEvent struct {
Type OutputType `json:"type"`
// The content of event with type OutputTypeNewRoomEvent
NewRoomEvent *OutputNewRoomEvent `json:"new_room_event,omitempty"`
// The content of event with type OutputTypeNewInviteEvent
NewInviteEvent *OutputNewInviteEvent `json:"new_invite_event,omitempty"`
// The content of event with type OutputTypeRetireInviteEvent
RetireInviteEvent *OutputRetireInviteEvent `json:"retire_invite_event,omitempty"`
}
// An OutputNewRoomEvent is written when the roomserver receives a new event.
@ -98,3 +108,26 @@ type OutputNewRoomEvent struct {
// future proof the API for virtual hosting.
SendAsServer string `json:"send_as_server"`
}
// An OutputNewInviteEvent is written whenever an invite becomes active.
// Invite events can be received outside of an existing room so have to be
// tracked separately from the room events themselves.
type OutputNewInviteEvent struct {
// The "m.room.member" invite event.
Event gomatrixserverlib.Event `json:"event"`
}
// An OutputRetireInviteEvent is written whenever an existing invite is no longer
// active. An invite stops being active if the user joins the room or if the
// invite is rejected by the user.
type OutputRetireInviteEvent struct {
// The ID of the "m.room.member" invite event.
EventID string
// Optional event ID of the event that replaced the invite.
// This can be empty if the invite was rejected locally and we were unable
// to reach the server that originally sent the invite.
RetiredByEventID string
// The "membership" of the user after retiring the invite. One of "join"
// "leave" or "ban".
Membership string
}

View File

@ -43,8 +43,8 @@ type RoomEventDatabase interface {
// OutputRoomEventWriter has the APIs needed to write an event to the output logs.
type OutputRoomEventWriter interface {
// Write an event.
WriteOutputRoomEvent(output api.OutputNewRoomEvent) error
// Write a list of events for a room
WriteOutputEvents(roomID string, updates []api.OutputEvent) error
}
func processRoomEvent(db RoomEventDatabase, ow OutputRoomEventWriter, input api.InputRoomEvent) error {

View File

@ -46,22 +46,21 @@ type RoomserverInputAPI struct {
processed int64
}
// WriteOutputRoomEvent implements OutputRoomEventWriter
func (r *RoomserverInputAPI) WriteOutputRoomEvent(output api.OutputNewRoomEvent) error {
var m sarama.ProducerMessage
oe := api.OutputEvent{
Type: api.OutputTypeNewRoomEvent,
NewRoomEvent: &output,
// WriteOutputEvents implements OutputRoomEventWriter
func (r *RoomserverInputAPI) WriteOutputEvents(roomID string, updates []api.OutputEvent) error {
messages := make([]*sarama.ProducerMessage, len(updates))
for i := range updates {
value, err := json.Marshal(updates[i])
if err != nil {
return err
}
messages[i] = &sarama.ProducerMessage{
Topic: r.OutputRoomEventTopic,
Key: sarama.StringEncoder(roomID),
Value: sarama.ByteEncoder(value),
}
}
value, err := json.Marshal(oe)
if err != nil {
return err
}
m.Topic = r.OutputRoomEventTopic
m.Key = sarama.StringEncoder("")
m.Value = sarama.ByteEncoder(value)
_, _, err = r.Producer.SendMessage(&m)
return err
return r.Producer.SendMessages(messages)
}
// InputRoomEvents implements api.RoomserverInputAPI

View File

@ -66,69 +66,88 @@ func updateLatestEvents(
}
}()
err = doUpdateLatestEvents(db, updater, ow, roomNID, stateAtEvent, event, sendAsServer)
return
u := latestEventsUpdater{
db: db, updater: updater, ow: ow, roomNID: roomNID,
stateAtEvent: stateAtEvent, event: event, sendAsServer: sendAsServer,
}
return u.doUpdateLatestEvents()
}
func doUpdateLatestEvents(
db RoomEventDatabase,
updater types.RoomRecentEventsUpdater,
ow OutputRoomEventWriter,
roomNID types.RoomNID,
stateAtEvent types.StateAtEvent,
event gomatrixserverlib.Event,
sendAsServer string,
) error {
// latestEventsUpdater tracks the state used to update the latest events in the
// room. It mostly just ferries state between the various function calls.
// The state could be passed using function arguments, but it becomes impractical
// when there are so many variables to pass around.
type latestEventsUpdater struct {
db RoomEventDatabase
updater types.RoomRecentEventsUpdater
ow OutputRoomEventWriter
roomNID types.RoomNID
stateAtEvent types.StateAtEvent
event gomatrixserverlib.Event
// Which server to send this event as.
sendAsServer string
// The eventID of the event that was processed before this one.
lastEventIDSent string
// The latest events in the room after processing this event.
latest []types.StateAtEventAndReference
// The state entries removed from and added to the current state of the
// room as a result of processing this event. They are sorted lists.
removed []types.StateEntry
added []types.StateEntry
// The state entries that are removed and added to recover the state before
// the event being processed. They are sorted lists.
stateBeforeEventRemoves []types.StateEntry
stateBeforeEventAdds []types.StateEntry
// The snapshots of current state before and after processing this event
oldStateNID types.StateSnapshotNID
newStateNID types.StateSnapshotNID
}
func (u *latestEventsUpdater) doUpdateLatestEvents() error {
var err error
var prevEvents []gomatrixserverlib.EventReference
prevEvents = event.PrevEvents()
oldLatest := updater.LatestEvents()
lastEventIDSent := updater.LastEventIDSent()
oldStateNID := updater.CurrentStateSnapshotNID()
prevEvents = u.event.PrevEvents()
oldLatest := u.updater.LatestEvents()
u.lastEventIDSent = u.updater.LastEventIDSent()
u.oldStateNID = u.updater.CurrentStateSnapshotNID()
if hasBeenSent, err := updater.HasEventBeenSent(stateAtEvent.EventNID); err != nil {
if hasBeenSent, err := u.updater.HasEventBeenSent(u.stateAtEvent.EventNID); err != nil {
return err
} else if hasBeenSent {
// Already sent this event so we can stop processing
return nil
}
if err = updater.StorePreviousEvents(stateAtEvent.EventNID, prevEvents); err != nil {
if err = u.updater.StorePreviousEvents(u.stateAtEvent.EventNID, prevEvents); err != nil {
return err
}
eventReference := event.EventReference()
eventReference := u.event.EventReference()
// Check if this event is already referenced by another event in the room.
var alreadyReferenced bool
if alreadyReferenced, err = updater.IsReferenced(eventReference); err != nil {
if alreadyReferenced, err = u.updater.IsReferenced(eventReference); err != nil {
return err
}
newLatest := calculateLatest(oldLatest, alreadyReferenced, prevEvents, types.StateAtEventAndReference{
u.latest = calculateLatest(oldLatest, alreadyReferenced, prevEvents, types.StateAtEventAndReference{
EventReference: eventReference,
StateAtEvent: stateAtEvent,
StateAtEvent: u.stateAtEvent,
})
latestStateAtEvents := make([]types.StateAtEvent, len(newLatest))
for i := range newLatest {
latestStateAtEvents[i] = newLatest[i].StateAtEvent
if err = u.latestState(); err != nil {
return err
}
newStateNID, err := state.CalculateAndStoreStateAfterEvents(db, roomNID, latestStateAtEvents)
updates, err := updateMemberships(u.db, u.updater, u.removed, u.added)
if err != nil {
return err
}
removed, added, err := state.DifferenceBetweeenStateSnapshots(db, oldStateNID, newStateNID)
if err != nil {
return err
}
stateBeforeEventRemoves, stateBeforeEventAdds, err := state.DifferenceBetweeenStateSnapshots(
db, newStateNID, stateAtEvent.BeforeStateSnapshotNID,
)
update, err := u.makeOutputNewRoomEvent()
if err != nil {
return err
}
updates = append(updates, *update)
// 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.
@ -138,24 +157,47 @@ 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,
stateBeforeEventRemoves, stateBeforeEventAdds, sendAsServer,
); err != nil {
if err = u.ow.WriteOutputEvents(u.event.RoomID(), updates); err != nil {
return err
}
if err = updater.SetLatestEvents(roomNID, newLatest, stateAtEvent.EventNID, newStateNID); err != nil {
if err = u.updater.SetLatestEvents(u.roomNID, u.latest, u.stateAtEvent.EventNID, u.newStateNID); err != nil {
return err
}
if err = updater.MarkEventAsSent(stateAtEvent.EventNID); err != nil {
if err = u.updater.MarkEventAsSent(u.stateAtEvent.EventNID); err != nil {
return err
}
return nil
}
func (u *latestEventsUpdater) latestState() error {
var err error
latestStateAtEvents := make([]types.StateAtEvent, len(u.latest))
for i := range u.latest {
latestStateAtEvents[i] = u.latest[i].StateAtEvent
}
u.newStateNID, err = state.CalculateAndStoreStateAfterEvents(u.db, u.roomNID, latestStateAtEvents)
if err != nil {
return err
}
u.removed, u.added, err = state.DifferenceBetweeenStateSnapshots(u.db, u.oldStateNID, u.newStateNID)
if err != nil {
return err
}
u.stateBeforeEventRemoves, u.stateBeforeEventAdds, err = state.DifferenceBetweeenStateSnapshots(
u.db, u.newStateNID, u.stateAtEvent.BeforeStateSnapshotNID,
)
if err != nil {
return err
}
return nil
}
func calculateLatest(oldLatest []types.StateAtEventAndReference, alreadyReferenced bool, prevEvents []gomatrixserverlib.EventReference, newEvent types.StateAtEventAndReference) []types.StateAtEventAndReference {
var alreadyInLatest bool
var newLatest []types.StateAtEventAndReference
@ -189,57 +231,55 @@ func calculateLatest(oldLatest []types.StateAtEventAndReference, alreadyReferenc
return newLatest
}
func writeEvent(
db RoomEventDatabase, ow OutputRoomEventWriter, lastEventIDSent string,
event gomatrixserverlib.Event, latest []types.StateAtEventAndReference,
removed, added []types.StateEntry,
stateBeforeEventRemoves, stateBeforeEventAdds []types.StateEntry,
sendAsServer string,
) error {
func (u *latestEventsUpdater) makeOutputNewRoomEvent() (*api.OutputEvent, error) {
latestEventIDs := make([]string, len(latest))
for i := range latest {
latestEventIDs[i] = latest[i].EventID
latestEventIDs := make([]string, len(u.latest))
for i := range u.latest {
latestEventIDs[i] = u.latest[i].EventID
}
ore := api.OutputNewRoomEvent{
Event: event,
LastSentEventID: lastEventIDSent,
Event: u.event,
LastSentEventID: u.lastEventIDSent,
LatestEventIDs: latestEventIDs,
}
var stateEventNIDs []types.EventNID
for _, entry := range added {
for _, entry := range u.added {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
for _, entry := range removed {
for _, entry := range u.removed {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
for _, entry := range stateBeforeEventRemoves {
for _, entry := range u.stateBeforeEventRemoves {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
for _, entry := range stateBeforeEventAdds {
for _, entry := range u.stateBeforeEventAdds {
stateEventNIDs = append(stateEventNIDs, entry.EventNID)
}
stateEventNIDs = stateEventNIDs[:util.SortAndUnique(eventNIDSorter(stateEventNIDs))]
eventIDMap, err := db.EventIDs(stateEventNIDs)
eventIDMap, err := u.db.EventIDs(stateEventNIDs)
if err != nil {
return err
return nil, err
}
for _, entry := range added {
for _, entry := range u.added {
ore.AddsStateEventIDs = append(ore.AddsStateEventIDs, eventIDMap[entry.EventNID])
}
for _, entry := range removed {
for _, entry := range u.removed {
ore.RemovesStateEventIDs = append(ore.RemovesStateEventIDs, eventIDMap[entry.EventNID])
}
for _, entry := range stateBeforeEventRemoves {
for _, entry := range u.stateBeforeEventRemoves {
ore.StateBeforeRemovesEventIDs = append(ore.StateBeforeRemovesEventIDs, eventIDMap[entry.EventNID])
}
for _, entry := range stateBeforeEventAdds {
for _, entry := range u.stateBeforeEventAdds {
ore.StateBeforeAddsEventIDs = append(ore.StateBeforeAddsEventIDs, eventIDMap[entry.EventNID])
}
ore.SendAsServer = sendAsServer
return ow.WriteOutputRoomEvent(ore)
ore.SendAsServer = u.sendAsServer
return &api.OutputEvent{
Type: api.OutputTypeNewRoomEvent,
NewRoomEvent: &ore,
}, nil
}
type eventNIDSorter []types.EventNID

View File

@ -0,0 +1,297 @@
// Copyright 2017 Vector Creations Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package input
import (
"fmt"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib"
)
// updateMembership updates the current membership and the invites for each
// user affected by a change in the current state of the room.
// Returns a list of output events to write to the kafka log to inform the
// consumers about the invites added or retired by the change in current state.
func updateMemberships(
db RoomEventDatabase, updater types.RoomRecentEventsUpdater, removed, added []types.StateEntry,
) ([]api.OutputEvent, error) {
changes := membershipChanges(removed, added)
var eventNIDs []types.EventNID
for _, change := range changes {
if change.addedEventNID != 0 {
eventNIDs = append(eventNIDs, change.addedEventNID)
}
if change.removedEventNID != 0 {
eventNIDs = append(eventNIDs, change.removedEventNID)
}
}
// Load the event JSON so we can look up the "membership" key.
// TODO: Maybe add a membership key to the events table so we can load that
// key without having to load the entire event JSON?
events, err := db.Events(eventNIDs)
if err != nil {
return nil, err
}
var updates []api.OutputEvent
for _, change := range changes {
var ae *gomatrixserverlib.Event
var re *gomatrixserverlib.Event
targetUserNID := change.EventStateKeyNID
if change.removedEventNID != 0 {
ev, _ := eventMap(events).lookup(change.removedEventNID)
if ev != nil {
re = &ev.Event
}
}
if change.addedEventNID != 0 {
ev, _ := eventMap(events).lookup(change.addedEventNID)
if ev != nil {
ae = &ev.Event
}
}
if updates, err = updateMembership(updater, targetUserNID, re, ae, updates); err != nil {
return nil, err
}
}
return nil, nil
}
func updateMembership(
updater types.RoomRecentEventsUpdater, targetUserNID types.EventStateKeyNID,
remove, add *gomatrixserverlib.Event,
updates []api.OutputEvent,
) ([]api.OutputEvent, error) {
var err error
// Default the membership to "leave" if no event was added or removed.
old := "leave"
new := "leave"
if remove != nil {
old, err = remove.Membership()
if err != nil {
return nil, err
}
}
if add != nil {
new, err = add.Membership()
if err != nil {
return nil, err
}
}
if old == new {
// If the membership is the same then nothing changed and we can return
// immediately. This should help speed up processing for display name
// changes where the membership is "join" both before and after.
return updates, nil
}
mu, err := updater.MembershipUpdater(targetUserNID)
if err != nil {
return nil, err
}
switch new {
case "invite":
return updateToInviteMembership(mu, add, updates)
case "join":
return updateToJoinMembership(mu, add, updates)
case "leave", "ban":
return updateToLeaveMembership(mu, add, new, updates)
default:
panic(fmt.Errorf(
"input: membership %q is not one of the allowed values", new,
))
}
}
func updateToInviteMembership(
mu types.MembershipUpdater, add *gomatrixserverlib.Event, updates []api.OutputEvent,
) ([]api.OutputEvent, error) {
// We may have already sent the invite to the user, either because we are
// reprocessing this event, or because the we received this invite from a
// remote server via the federation invite API. In those cases we don't need
// to send the event.
needsSending, err := mu.SetToInvite(*add)
if err != nil {
return nil, err
}
if needsSending {
// We notify the consumers using a special event even though we will
// notify them about the change in current state as part of the normal
// room event stream. This ensures that the consumers only have to
// consider a single stream of events when determining whether a user
// is invited, rather than having to combine multiple streams themselves.
onie := api.OutputNewInviteEvent{
Event: *add,
}
updates = append(updates, api.OutputEvent{
Type: api.OutputTypeNewInviteEvent,
NewInviteEvent: &onie,
})
}
return updates, nil
}
func updateToJoinMembership(
mu types.MembershipUpdater, add *gomatrixserverlib.Event, updates []api.OutputEvent,
) ([]api.OutputEvent, error) {
// If the user is already marked as being joined then we can return immediately.
// TODO: Is this code reachable given the "old != new" guard in updateMembership?
if mu.IsJoin() {
return updates, nil
}
// When we mark a user as being joined we will invalidate any invites that
// are active for that user. We notify the consumers that the invites have
// been retired using a special event, even though they could infer this
// by studying the state changes in the room event stream.
retired, err := mu.SetToJoin(add.Sender())
if err != nil {
return nil, err
}
for _, eventID := range retired {
orie := api.OutputRetireInviteEvent{
EventID: eventID,
Membership: "join",
}
if add != nil {
orie.RetiredByEventID = add.EventID()
}
updates = append(updates, api.OutputEvent{
Type: api.OutputTypeRetireInviteEvent,
RetireInviteEvent: &orie,
})
}
return updates, nil
}
func updateToLeaveMembership(
mu types.MembershipUpdater, add *gomatrixserverlib.Event,
newMembership string, updates []api.OutputEvent,
) ([]api.OutputEvent, error) {
// If the user is already neither joined, nor invited to the room then we
// can return immediately.
if mu.IsLeave() {
return updates, nil
}
// When we mark a user as having left we will invalidate any invites that
// are active for that user. We notify the consumers that the invites have
// been retired using a special event, even though they could infer this
// by studying the state changes in the room event stream.
retired, err := mu.SetToLeave(add.Sender())
if err != nil {
return nil, err
}
for _, eventID := range retired {
orie := api.OutputRetireInviteEvent{
EventID: eventID,
Membership: newMembership,
}
if add != nil {
orie.RetiredByEventID = add.EventID()
}
updates = append(updates, api.OutputEvent{
Type: api.OutputTypeRetireInviteEvent,
RetireInviteEvent: &orie,
})
}
return updates, nil
}
// membershipChanges pairs up the membership state changes from a sorted list
// of state removed and a sorted list of state added.
func membershipChanges(removed, added []types.StateEntry) []stateChange {
changes := pairUpChanges(removed, added)
var result []stateChange
for _, c := range changes {
if c.EventTypeNID == types.MRoomMemberNID {
result = append(result, c)
}
}
return result
}
type stateChange struct {
types.StateKeyTuple
removedEventNID types.EventNID
addedEventNID types.EventNID
}
// pairUpChanges pairs up the state events added and removed for each type,
// state key tuple. Assumes that removed and added are sorted.
func pairUpChanges(removed, added []types.StateEntry) []stateChange {
var ai int
var ri int
var result []stateChange
for {
switch {
case ai == len(added):
// We've reached the end of the added entries.
// The rest of the removed list are events that were removed without
// an event with the same state key being added.
for _, s := range removed[ri:] {
result = append(result, stateChange{
StateKeyTuple: s.StateKeyTuple,
removedEventNID: s.EventNID,
})
}
return result
case ri == len(removed):
// We've reached the end of the removed entries.
// The rest of the added list are events that were added without
// an event with the same state key being removed.
for _, s := range added[ai:] {
result = append(result, stateChange{
StateKeyTuple: s.StateKeyTuple,
addedEventNID: s.EventNID,
})
}
return result
case added[ai].StateKeyTuple == removed[ri].StateKeyTuple:
// The tuple is in both lists so an event with that key is being
// removed and another event with the same key is being added.
result = append(result, stateChange{
StateKeyTuple: added[ai].StateKeyTuple,
removedEventNID: removed[ri].EventNID,
addedEventNID: added[ai].EventNID,
})
ai++
ri++
case added[ai].StateKeyTuple.LessThan(removed[ri].StateKeyTuple):
// The lists are sorted so the added entry being less than the
// removed entry means that the added event was added without an
// event with the same key being removed.
result = append(result, stateChange{
StateKeyTuple: added[ai].StateKeyTuple,
addedEventNID: added[ai].EventNID,
})
ai++
default:
// Reaching the default case implies that the removed entry is less
// than the added entry. Since the lists are sorted this means that
// the removed event was removed without an event with the same
// key being added.
result = append(result, stateChange{
StateKeyTuple: removed[ai].StateKeyTuple,
removedEventNID: removed[ri].EventNID,
})
ri++
}
}
}

View File

@ -76,15 +76,23 @@ func (s *eventStateKeyStatements) prepare(db *sql.DB) (err error) {
}.prepare(db)
}
func (s *eventStateKeyStatements) insertEventStateKeyNID(eventStateKey string) (types.EventStateKeyNID, error) {
func (s *eventStateKeyStatements) insertEventStateKeyNID(txn *sql.Tx, eventStateKey string) (types.EventStateKeyNID, error) {
var eventStateKeyNID int64
err := s.insertEventStateKeyNIDStmt.QueryRow(eventStateKey).Scan(&eventStateKeyNID)
stmt := s.insertEventStateKeyNIDStmt
if txn != nil {
stmt = txn.Stmt(stmt)
}
err := stmt.QueryRow(eventStateKey).Scan(&eventStateKeyNID)
return types.EventStateKeyNID(eventStateKeyNID), err
}
func (s *eventStateKeyStatements) selectEventStateKeyNID(eventStateKey string) (types.EventStateKeyNID, error) {
func (s *eventStateKeyStatements) selectEventStateKeyNID(txn *sql.Tx, eventStateKey string) (types.EventStateKeyNID, error) {
var eventStateKeyNID int64
err := s.selectEventStateKeyNIDStmt.QueryRow(eventStateKey).Scan(&eventStateKeyNID)
stmt := s.selectEventStateKeyNIDStmt
if txn != nil {
stmt = txn.Stmt(stmt)
}
err := stmt.QueryRow(eventStateKey).Scan(&eventStateKeyNID)
return types.EventStateKeyNID(eventStateKeyNID), err
}

View File

@ -0,0 +1,149 @@
// Copyright 2017 Vector Creations Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package storage
import (
"database/sql"
"github.com/matrix-org/dendrite/roomserver/types"
)
const inviteSchema = `
CREATE TABLE IF NOT EXISTS roomserver_invites (
-- The string ID of the invite event itself.
-- We can't use a numeric event ID here because we don't always have
-- enough information to store an invite in the event table.
-- In particular we don't always have a chain of auth_events for invites
-- received over federation.
invite_event_id TEXT PRIMARY KEY,
-- The numeric ID of the room the invite m.room.member event is in.
room_nid BIGINT NOT NULL,
-- The numeric ID for the state key of the invite m.room.member event.
-- This tells us who the invite is for.
-- This is used to query the active invites for a user.
target_nid BIGINT NOT NULL,
-- The numeric ID for the sender of the invite m.room.member event.
-- This tells us who sent the invite.
-- This is used to work out which matrix server we should talk to when
-- we try to join the room.
sender_nid BIGINT NOT NULL DEFAULT 0,
-- This is used to track whether the invite is still active.
-- This is set implicitly when processing new join and leave events and
-- explicitly when rejecting events over federation.
retired BOOLEAN NOT NULL DEFAULT FALSE,
-- The invite event JSON.
invite_event_json TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS roomserver_invites_active_idx ON roomserver_invites (target_nid, room_nid)
WHERE NOT retired;
`
const insertInviteEventSQL = "" +
"INSERT INTO roomserver_invites (invite_event_id, room_nid, target_nid," +
" sender_nid, invite_event_json) VALUES ($1, $2, $3, $4, $5)" +
" ON CONFLICT DO NOTHING"
const selectInviteActiveForUserInRoomSQL = "" +
"SELECT sender_nid FROM roomserver_invites" +
" WHERE target_nid = $1 AND room_nid = $2" +
" AND NOT retired"
// Retire every active invite for a user in a room.
// Ideally we'd know which invite events were retired by a given update so we
// wouldn't need to remove every active invite.
// However the matrix protocol doesn't give us a way to reliably identify the
// invites that were retired, so we are forced to retire all of them.
const updateInviteRetiredSQL = "" +
"UPDATE roomserver_invites SET retired = TRUE" +
" WHERE room_nid = $1 AND target_nid = $2 AND NOT retired" +
" RETURNING invite_event_id"
type inviteStatements struct {
insertInviteEventStmt *sql.Stmt
selectInviteActiveForUserInRoomStmt *sql.Stmt
updateInviteRetiredStmt *sql.Stmt
}
func (s *inviteStatements) prepare(db *sql.DB) (err error) {
_, err = db.Exec(inviteSchema)
if err != nil {
return
}
return statementList{
{&s.insertInviteEventStmt, insertInviteEventSQL},
{&s.selectInviteActiveForUserInRoomStmt, selectInviteActiveForUserInRoomSQL},
{&s.updateInviteRetiredStmt, updateInviteRetiredSQL},
}.prepare(db)
}
func (s *inviteStatements) insertInviteEvent(
txn *sql.Tx, inviteEventID string, roomNID types.RoomNID,
targetUserNID, senderUserNID types.EventStateKeyNID,
inviteEventJSON []byte,
) (bool, error) {
result, err := txn.Stmt(s.insertInviteEventStmt).Exec(
inviteEventID, roomNID, targetUserNID, senderUserNID, inviteEventJSON,
)
if err != nil {
return false, err
}
count, err := result.RowsAffected()
if err != nil {
return false, err
}
return count != 0, nil
}
func (s *inviteStatements) updateInviteRetired(
txn *sql.Tx, roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
) ([]string, error) {
rows, err := txn.Stmt(s.updateInviteRetiredStmt).Query(roomNID, targetUserNID)
if err != nil {
return nil, err
}
defer rows.Close()
var result []string
for rows.Next() {
var inviteEventID string
if err := rows.Scan(&inviteEventID); err != nil {
return nil, err
}
result = append(result, inviteEventID)
}
return result, nil
}
// selectInviteActiveForUserInRoom returns a list of sender state key NIDs
func (s *inviteStatements) selectInviteActiveForUserInRoom(
targetUserNID types.EventStateKeyNID, roomNID types.RoomNID,
) ([]types.EventStateKeyNID, error) {
rows, err := s.selectInviteActiveForUserInRoomStmt.Query(
targetUserNID, roomNID,
)
if err != nil {
return nil, err
}
defer rows.Close()
var result []types.EventStateKeyNID
for rows.Next() {
var senderUserNID int64
if err := rows.Scan(&senderUserNID); err != nil {
return nil, err
}
result = append(result, types.EventStateKeyNID(senderUserNID))
}
return result, nil
}

View File

@ -0,0 +1,111 @@
// Copyright 2017 Vector Creations Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package storage
import (
"database/sql"
"github.com/matrix-org/dendrite/roomserver/types"
)
type membershipState int64
const (
membershipStateLeaveOrBan membershipState = 1
membershipStateInvite membershipState = 2
membershipStateJoin membershipState = 3
)
const membershipSchema = `
-- The membership table is used to coordinate updates between the invite table
-- and the room state tables.
-- This table is updated in one of 3 ways:
-- 1) The membership of a user changes within the current state of the room.
-- 2) An invite is received outside of a room over federation.
-- 3) An invite is rejected outside of a room over federation.
CREATE TABLE IF NOT EXISTS roomserver_membership (
room_nid BIGINT NOT NULL,
-- Numeric state key ID for the user ID this state is for.
target_nid BIGINT NOT NULL,
-- Numeric state key ID for the user ID who changed the state.
-- This may be 0 since it is not always possible to identify the user that
-- changed the state.
sender_nid BIGINT NOT NULL DEFAULT 0,
-- The state the user is in within this room.
-- Default value is "membershipStateLeaveOrBan"
membership_nid BIGINT NOT NULL DEFAULT 1,
UNIQUE (room_nid, target_nid)
);
`
// Insert a row in to membership table so that it can be locked by the
// SELECT FOR UPDATE
const insertMembershipSQL = "" +
"INSERT INTO roomserver_membership (room_nid, target_nid)" +
" VALUES ($1, $2)" +
" ON CONFLICT DO NOTHING"
const selectMembershipForUpdateSQL = "" +
"SELECT membership_nid FROM roomserver_membership" +
" WHERE room_nid = $1 AND target_nid = $2 FOR UPDATE"
const updateMembershipSQL = "" +
"UPDATE roomserver_membership SET sender_nid = $3, membership_nid = $4" +
" WHERE room_nid = $1 AND target_nid = $2"
type membershipStatements struct {
insertMembershipStmt *sql.Stmt
selectMembershipForUpdateStmt *sql.Stmt
updateMembershipStmt *sql.Stmt
}
func (s *membershipStatements) prepare(db *sql.DB) (err error) {
_, err = db.Exec(membershipSchema)
if err != nil {
return
}
return statementList{
{&s.insertMembershipStmt, insertMembershipSQL},
{&s.selectMembershipForUpdateStmt, selectMembershipForUpdateSQL},
{&s.updateMembershipStmt, updateMembershipSQL},
}.prepare(db)
}
func (s *membershipStatements) insertMembership(
txn *sql.Tx, roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
) error {
_, err := txn.Stmt(s.insertMembershipStmt).Exec(roomNID, targetUserNID)
return err
}
func (s *membershipStatements) selectMembershipForUpdate(
txn *sql.Tx, roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
) (membership membershipState, err error) {
err = txn.Stmt(s.selectMembershipForUpdateStmt).QueryRow(
roomNID, targetUserNID,
).Scan(&membership)
return
}
func (s *membershipStatements) updateMembership(
txn *sql.Tx, roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
senderUserNID types.EventStateKeyNID, membership membershipState,
) error {
_, err := txn.Stmt(s.updateMembershipStmt).Exec(
roomNID, targetUserNID, senderUserNID, membership,
)
return err
}

View File

@ -28,6 +28,8 @@ type statements struct {
stateBlockStatements
previousEventStatements
roomAliasesStatements
inviteStatements
membershipStatements
}
func (s *statements) prepare(db *sql.DB) error {
@ -43,6 +45,8 @@ func (s *statements) prepare(db *sql.DB) error {
s.stateBlockStatements.prepare,
s.previousEventStatements.prepare,
s.roomAliasesStatements.prepare,
s.inviteStatements.prepare,
s.membershipStatements.prepare,
} {
if err = prepare(db); err != nil {
return err

View File

@ -16,6 +16,7 @@ package storage
import (
"database/sql"
// Import the postgres database driver.
_ "github.com/lib/pq"
"github.com/matrix-org/dendrite/roomserver/types"
@ -64,7 +65,7 @@ func (d *Database) StoreEvent(event gomatrixserverlib.Event, authEventNIDs []typ
// Assigned a numeric ID for the state_key if there is one present.
// Otherwise set the numeric ID for the state_key to 0.
if eventStateKey != nil {
if eventStateKeyNID, err = d.assignStateKeyNID(*eventStateKey); err != nil {
if eventStateKeyNID, err = d.assignStateKeyNID(nil, *eventStateKey); err != nil {
return 0, types.StateAtEvent{}, err
}
}
@ -131,15 +132,15 @@ func (d *Database) assignEventTypeNID(eventType string) (types.EventTypeNID, err
return eventTypeNID, err
}
func (d *Database) assignStateKeyNID(eventStateKey string) (types.EventStateKeyNID, error) {
func (d *Database) assignStateKeyNID(txn *sql.Tx, eventStateKey string) (types.EventStateKeyNID, error) {
// Check if we already have a numeric ID in the database.
eventStateKeyNID, err := d.statements.selectEventStateKeyNID(eventStateKey)
eventStateKeyNID, err := d.statements.selectEventStateKeyNID(txn, eventStateKey)
if err == sql.ErrNoRows {
// We don't have a numeric ID so insert one into the database.
eventStateKeyNID, err = d.statements.insertEventStateKeyNID(eventStateKey)
eventStateKeyNID, err = d.statements.insertEventStateKeyNID(txn, eventStateKey)
if err == sql.ErrNoRows {
// We raced with another insert so run the select again.
eventStateKeyNID, err = d.statements.selectEventStateKeyNID(eventStateKey)
eventStateKeyNID, err = d.statements.selectEventStateKeyNID(txn, eventStateKey)
}
}
return eventStateKeyNID, err
@ -249,12 +250,15 @@ func (d *Database) GetLatestEventsForUpdate(roomNID types.RoomNID) (types.RoomRe
return nil, err
}
}
return &roomRecentEventsUpdater{txn, d, stateAndRefs, lastEventIDSent, currentStateSnapshotNID}, nil
return &roomRecentEventsUpdater{
transaction{txn}, d, roomNID, stateAndRefs, lastEventIDSent, currentStateSnapshotNID,
}, nil
}
type roomRecentEventsUpdater struct {
txn *sql.Tx
transaction
d *Database
roomNID types.RoomNID
latestEvents []types.StateAtEventAndReference
lastEventIDSent string
currentStateSnapshotNID types.StateSnapshotNID
@ -319,14 +323,8 @@ func (u *roomRecentEventsUpdater) MarkEventAsSent(eventNID types.EventNID) error
return u.d.statements.updateEventSentToOutput(u.txn, eventNID)
}
// Commit implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) Commit() error {
return u.txn.Commit()
}
// Rollback implements types.RoomRecentEventsUpdater
func (u *roomRecentEventsUpdater) Rollback() error {
return u.txn.Rollback()
func (u *roomRecentEventsUpdater) MembershipUpdater(targetUserNID types.EventStateKeyNID) (types.MembershipUpdater, error) {
return u.d.membershipUpdaterTxn(u.txn, u.roomNID, targetUserNID)
}
// RoomNID implements query.RoomserverQueryAPIDB
@ -381,3 +379,124 @@ func (d *Database) StateEntriesForTuples(
) ([]types.StateEntryList, error) {
return d.statements.bulkSelectFilteredStateBlockEntries(stateBlockNIDs, stateKeyTuples)
}
type membershipUpdater struct {
transaction
d *Database
roomNID types.RoomNID
targetUserNID types.EventStateKeyNID
membership membershipState
}
func (d *Database) membershipUpdaterTxn(
txn *sql.Tx, roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
) (types.MembershipUpdater, error) {
if err := d.statements.insertMembership(txn, roomNID, targetUserNID); err != nil {
return nil, err
}
membership, err := d.statements.selectMembershipForUpdate(txn, roomNID, targetUserNID)
if err != nil {
return nil, err
}
return &membershipUpdater{
transaction{txn}, d, roomNID, targetUserNID, membership,
}, nil
}
// IsInvite implements types.MembershipUpdater
func (u *membershipUpdater) IsInvite() bool {
return u.membership == membershipStateInvite
}
// IsJoin implements types.MembershipUpdater
func (u *membershipUpdater) IsJoin() bool {
return u.membership == membershipStateJoin
}
// IsLeave implements types.MembershipUpdater
func (u *membershipUpdater) IsLeave() bool {
return u.membership == membershipStateLeaveOrBan
}
// SetToInvite implements types.MembershipUpdater
func (u *membershipUpdater) SetToInvite(event gomatrixserverlib.Event) (bool, error) {
senderUserNID, err := u.d.assignStateKeyNID(u.txn, event.Sender())
if err != nil {
return false, err
}
inserted, err := u.d.statements.insertInviteEvent(
u.txn, event.EventID(), u.roomNID, u.targetUserNID, senderUserNID, event.JSON(),
)
if err != nil {
return false, err
}
if u.membership != membershipStateInvite {
if err = u.d.statements.updateMembership(
u.txn, u.roomNID, u.targetUserNID, senderUserNID, membershipStateInvite,
); err != nil {
return false, err
}
}
return inserted, nil
}
// SetToJoin implements types.MembershipUpdater
func (u *membershipUpdater) SetToJoin(senderUserID string) ([]string, error) {
senderUserNID, err := u.d.assignStateKeyNID(u.txn, senderUserID)
if err != nil {
return nil, err
}
inviteEventIDs, err := u.d.statements.updateInviteRetired(
u.txn, u.roomNID, u.targetUserNID,
)
if err != nil {
return nil, err
}
if u.membership != membershipStateJoin {
if err = u.d.statements.updateMembership(
u.txn, u.roomNID, u.targetUserNID, senderUserNID, membershipStateJoin,
); err != nil {
return nil, err
}
}
return inviteEventIDs, nil
}
// SetToLeave implements types.MembershipUpdater
func (u *membershipUpdater) SetToLeave(senderUserID string) ([]string, error) {
senderUserNID, err := u.d.assignStateKeyNID(u.txn, senderUserID)
if err != nil {
return nil, err
}
inviteEventIDs, err := u.d.statements.updateInviteRetired(
u.txn, u.roomNID, u.targetUserNID,
)
if err != nil {
return nil, err
}
if u.membership != membershipStateLeaveOrBan {
if err = u.d.statements.updateMembership(
u.txn, u.roomNID, u.targetUserNID, senderUserNID, membershipStateLeaveOrBan,
); err != nil {
return nil, err
}
}
return inviteEventIDs, nil
}
type transaction struct {
txn *sql.Tx
}
// Commit implements types.Transaction
func (t *transaction) Commit() error {
return t.txn.Commit()
}
// Rollback implements types.Transaction
func (t *transaction) Rollback() error {
return t.txn.Rollback()
}

View File

@ -135,9 +135,17 @@ type StateEntryList struct {
StateEntries []StateEntry
}
// A Transaction is something that can be committed or rolledback.
type Transaction interface {
// Commit the transaction
Commit() error
// Rollback the transaction.
Rollback() error
}
// A RoomRecentEventsUpdater is used to update the recent events in a room.
// (On postgresql this wraps a database transaction that holds a "FOR UPDATE"
// lock on the row holding the latest events for the room.)
// lock on the row in the rooms table holding the latest events for the room.)
type RoomRecentEventsUpdater interface {
// The latest event IDs and state in the room.
LatestEvents() []StateAtEventAndReference
@ -163,10 +171,36 @@ type RoomRecentEventsUpdater interface {
HasEventBeenSent(eventNID EventNID) (bool, error)
// Mark the event as having been sent to the output logs.
MarkEventAsSent(eventNID EventNID) error
// Commit the transaction
Commit() error
// Rollback the transaction.
Rollback() error
// Build a membership updater for the target user in this room.
// It will share the same transaction as this updater.
MembershipUpdater(targetUserNID EventStateKeyNID) (MembershipUpdater, error)
// Implements Transaction so it can be committed or rolledback
Transaction
}
// A MembershipUpdater is used to update the membership of a user in a room.
// (On postgresql this wraps a database transaction that holds a "FOR UPDATE"
// lock on the row in the membership table for this user in the room)
// The caller should call one of SetToInvite, SetToJoin or SetToLeave once to
// make the update, or none of them if no update is required.
type MembershipUpdater interface {
// True if the target user is invited to the room before updating.
IsInvite() bool
// True if the target user is joined to the room before updating.
IsJoin() bool
// True if the target user is not invited or joined to the room before updating.
IsLeave() bool
// Set the state to invite.
// Returns whether this invite needs to be sent
SetToInvite(event gomatrixserverlib.Event) (needsSending bool, err error)
// Set the state to join.
// Returns a list of invite event IDs that this state change retired.
SetToJoin(senderUserID string) (inviteEventIDs []string, err error)
// Set the state to leave.
// Returns a list of invite event IDs that this state change retired.
SetToLeave(senderUserID string) (inviteEventIDs []string, err error)
// Implements Transaction so it can be committed or rolledback.
Transaction
}
// A MissingEventError is an error that happened because the roomserver was