tables

Documentation

Index

• type AccountData
• type BackwardsExtremities
• type CurrentRoomState
• type Events
• type Filter
• type Invites
• type Peeks
• type Receipts
• type SendToDevice
• type Topology

Types

type AccountData

type AccountData interface {
	InsertAccountData(ctx context.Context, txn *sql.Tx, userID, roomID, dataType string) (pos types.StreamPosition, err error)
	// SelectAccountDataInRange returns a map of room ID to a list of `dataType`.
	SelectAccountDataInRange(ctx context.Context, userID string, r types.Range, accountDataEventFilter *gomatrixserverlib.EventFilter) (data map[string][]string, err error)
	SelectMaxAccountDataID(ctx context.Context, txn *sql.Tx) (id int64, err error)
}

type BackwardsExtremities

type BackwardsExtremities interface {
	// InsertsBackwardExtremity inserts a new backwards extremity.
	InsertsBackwardExtremity(ctx context.Context, txn *sql.Tx, roomID, eventID string, prevEventID string) (err error)
	// SelectBackwardExtremitiesForRoom retrieves all backwards extremities for the room, as a map of event_id to list of prev_event_ids.
	SelectBackwardExtremitiesForRoom(ctx context.Context, roomID string) (bwExtrems map[string][]string, err error)
	// DeleteBackwardExtremity removes a backwards extremity for a room, if one existed.
	DeleteBackwardExtremity(ctx context.Context, txn *sql.Tx, roomID, knownEventID string) (err error)
	// DeleteBackwardExtremitiesFoorRoomID removes all backward extremities for a room. This should only be done when removing the room entirely.
	DeleteBackwardExtremitiesForRoom(ctx context.Context, txn *sql.Tx, roomID string) (err error)
}

BackwardsExtremities keeps track of backwards extremities for a room. Backwards extremities are the earliest (DAG-wise) known events which we have the entire event JSON. These event IDs are used in federation requests to fetch even earlier events.

We persist the previous event IDs as well, one per row, so when we do fetch even earlier events we can simply delete rows which referenced it. Consider the graph:

    A
    |   Event C has 1 prev_event ID: A.
B   C
|___|   Event D has 2 prev_event IDs: B and C.
  |
  D

The earliest known event we have is D, so this table has 2 rows. A backfill request gives us C but not B. We delete rows where prev_event=C. This still means that D is a backwards extremity as we do not have event B. However, event C is *also* a backwards extremity at this point as we do not have event A. Later, when we fetch event B, we delete rows where prev_event=B. This then removes D as a backwards extremity because there are no more rows with event_id=B.

type CurrentRoomState

type CurrentRoomState interface {
	SelectStateEvent(ctx context.Context, roomID, evType, stateKey string) (*gomatrixserverlib.HeaderedEvent, error)
	SelectEventsWithEventIDs(ctx context.Context, txn *sql.Tx, eventIDs []string) ([]types.StreamEvent, error)
	UpsertRoomState(ctx context.Context, txn *sql.Tx, event *gomatrixserverlib.HeaderedEvent, membership *string, addedAt types.StreamPosition) error
	DeleteRoomStateByEventID(ctx context.Context, txn *sql.Tx, eventID string) error
	DeleteRoomStateForRoom(ctx context.Context, txn *sql.Tx, roomID string) error
	// SelectCurrentState returns all the current state events for the given room.
	SelectCurrentState(ctx context.Context, txn *sql.Tx, roomID string, stateFilter *gomatrixserverlib.StateFilter) ([]*gomatrixserverlib.HeaderedEvent, error)
	// SelectRoomIDsWithMembership returns the list of room IDs which have the given user in the given membership state.
	SelectRoomIDsWithMembership(ctx context.Context, txn *sql.Tx, userID string, membership string) ([]string, error)
	// SelectJoinedUsers returns a map of room ID to a list of joined user IDs.
	SelectJoinedUsers(ctx context.Context) (map[string][]string, error)
}

type Events

type Events interface {
	SelectStateInRange(ctx context.Context, txn *sql.Tx, r types.Range, stateFilter *gomatrixserverlib.StateFilter) (map[string]map[string]bool, map[string]types.StreamEvent, error)
	SelectMaxEventID(ctx context.Context, txn *sql.Tx) (id int64, err error)
	InsertEvent(ctx context.Context, txn *sql.Tx, event *gomatrixserverlib.HeaderedEvent, addState, removeState []string, transactionID *api.TransactionID, excludeFromSync bool) (streamPos types.StreamPosition, err error)
	// SelectRecentEvents returns events between the two stream positions: exclusive of low and inclusive of high.
	// If onlySyncEvents has a value of true, only returns the events that aren't marked as to exclude from sync.
	// Returns up to `limit` events. Returns `limited=true` if there are more events in this range but we hit the `limit`.
	SelectRecentEvents(ctx context.Context, txn *sql.Tx, roomID string, r types.Range, limit int, chronologicalOrder bool, onlySyncEvents bool) ([]types.StreamEvent, bool, error)
	// SelectEarlyEvents returns the earliest events in the given room.
	SelectEarlyEvents(ctx context.Context, txn *sql.Tx, roomID string, r types.Range, limit int) ([]types.StreamEvent, error)
	SelectEvents(ctx context.Context, txn *sql.Tx, eventIDs []string) ([]types.StreamEvent, error)
	UpdateEventJSON(ctx context.Context, event *gomatrixserverlib.HeaderedEvent) error
	// DeleteEventsForRoom removes all event information for a room. This should only be done when removing the room entirely.
	DeleteEventsForRoom(ctx context.Context, txn *sql.Tx, roomID string) (err error)
}

type Filter

type Filter interface {
	SelectFilter(ctx context.Context, localpart string, filterID string) (*gomatrixserverlib.Filter, error)
	InsertFilter(ctx context.Context, filter *gomatrixserverlib.Filter, localpart string) (filterID string, err error)
}

type Invites

type Invites interface {
	InsertInviteEvent(ctx context.Context, txn *sql.Tx, inviteEvent *gomatrixserverlib.HeaderedEvent) (streamPos types.StreamPosition, err error)
	DeleteInviteEvent(ctx context.Context, txn *sql.Tx, inviteEventID string) (types.StreamPosition, error)
	// SelectInviteEventsInRange returns a map of room ID to invite events. If multiple invite/retired invites exist in the given range, return the latest value
	// for the room.
	SelectInviteEventsInRange(ctx context.Context, txn *sql.Tx, targetUserID string, r types.Range) (invites map[string]*gomatrixserverlib.HeaderedEvent, retired map[string]*gomatrixserverlib.HeaderedEvent, err error)
	SelectMaxInviteID(ctx context.Context, txn *sql.Tx) (id int64, err error)
}

type Peeks

type Peeks interface {
	InsertPeek(ctx context.Context, txn *sql.Tx, roomID, userID, deviceID string) (streamPos types.StreamPosition, err error)
	DeletePeek(ctx context.Context, txn *sql.Tx, roomID, userID, deviceID string) (streamPos types.StreamPosition, err error)
	DeletePeeks(ctx context.Context, txn *sql.Tx, roomID, userID string) (streamPos types.StreamPosition, err error)
	SelectPeeksInRange(ctxt context.Context, txn *sql.Tx, userID, deviceID string, r types.Range) (peeks []types.Peek, err error)
	SelectPeekingDevices(ctxt context.Context) (peekingDevices map[string][]types.PeekingDevice, err error)
	SelectMaxPeekID(ctx context.Context, txn *sql.Tx) (id int64, err error)
}

type Receipts

type Receipts interface {
	UpsertReceipt(ctx context.Context, txn *sql.Tx, roomId, receiptType, userId, eventId string, timestamp gomatrixserverlib.Timestamp) (pos types.StreamPosition, err error)
	SelectRoomReceiptsAfter(ctx context.Context, roomIDs []string, streamPos types.StreamPosition) (types.StreamPosition, []eduAPI.OutputReceiptEvent, error)
	SelectMaxReceiptID(ctx context.Context, txn *sql.Tx) (id int64, err error)
}

type SendToDevice

type SendToDevice interface {
	InsertSendToDeviceMessage(ctx context.Context, txn *sql.Tx, userID, deviceID, content string) (pos types.StreamPosition, err error)
	SelectSendToDeviceMessages(ctx context.Context, txn *sql.Tx, userID, deviceID string, from, to types.StreamPosition) (lastPos types.StreamPosition, events []types.SendToDeviceEvent, err error)
	DeleteSendToDeviceMessages(ctx context.Context, txn *sql.Tx, userID, deviceID string, from types.StreamPosition) (err error)
	SelectMaxSendToDeviceMessageID(ctx context.Context, txn *sql.Tx) (id int64, err error)
}

SendToDevice tracks send-to-device messages which are sent to individual clients. Each message gets inserted into this table at the point that we receive it from the EDU server.

We're supposed to try and do our best to deliver send-to-device messages once, but the only way that we can really guarantee that they have been delivered is if the client successfully requests the next sync as given in the next_batch. Each time the device syncs, we will request all of the updates that either haven't been sent yet, along with all updates that we *have* sent but we haven't confirmed to have been received yet. If it's the first time we're sending a given update then we update the table to say what the "since" parameter was when we tried to send it.

When the client syncs again, if their "since" parameter is *later* than the recorded one, we drop the entry from the DB as it's "sent". If the sync parameter isn't later then we will keep including the updates in the sync response, as the client is seemingly trying to repeat the same /sync.

type Topology

type Topology interface {
	// InsertEventInTopology inserts the given event in the room's topology, based on the event's depth.
	// `pos` is the stream position of this event in the events table, and is used to order events which have the same depth.
	InsertEventInTopology(ctx context.Context, txn *sql.Tx, event *gomatrixserverlib.HeaderedEvent, pos types.StreamPosition) (err error)
	// SelectEventIDsInRange selects the IDs of events whose depths are within a given range in a given room's topological order.
	// Events with `minDepth` are *exclusive*, as is the event which has exactly `minDepth`,`maxStreamPos`.
	// `maxStreamPos` is only used when events have the same depth as `maxDepth`, which results in events less than `maxStreamPos` being returned.
	// Returns an empty slice if no events match the given range.
	SelectEventIDsInRange(ctx context.Context, txn *sql.Tx, roomID string, minDepth, maxDepth, maxStreamPos types.StreamPosition, limit int, chronologicalOrder bool) (eventIDs []string, err error)
	// SelectPositionInTopology returns the depth and stream position of a given event in the topology of the room it belongs to.
	SelectPositionInTopology(ctx context.Context, txn *sql.Tx, eventID string) (depth, spos types.StreamPosition, err error)
	// SelectMaxPositionInTopology returns the event which has the highest depth, and if there are multiple, the event with the highest stream position.
	SelectMaxPositionInTopology(ctx context.Context, txn *sql.Tx, roomID string) (depth types.StreamPosition, spos types.StreamPosition, err error)
	// DeleteTopologyForRoom removes all topological information for a room. This should only be done when removing the room entirely.
	DeleteTopologyForRoom(ctx context.Context, txn *sql.Tx, roomID string) (err error)
}

Topology keeps track of the depths and stream positions for all events. These positions are used as types.TopologyToken when backfilling events locally.