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Further improve performance with lots of hidden events #10353

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Mar 20, 2023
Merged

Further improve performance with lots of hidden events #10353

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6c3e191
Rename mxEv to event
andybalaam Feb 10, 2023
3c2e015
Add a comment about why we're not using slice
andybalaam Mar 10, 2023
1bcf635
Avoid re-calculating shouldShowEvent in getReadReceiptsByShownEvent
andybalaam Mar 10, 2023
7dc3cc1
Test that uses a MainGrouper
andybalaam Mar 14, 2023
efda762
Cache more calls to shouldShowEvent
andybalaam Mar 10, 2023
a8203f6
Fix snapshot
andybalaam Mar 14, 2023
592a7b0
Fix type of nextEvent
andybalaam Mar 14, 2023
94101d2
Improve typing slightly
andybalaam Mar 16, 2023
49499d1
Apply review comments
andybalaam Mar 17, 2023
9423af8
Merge branch 'develop' into andybalaam/further-performance-of-geteven…
andybalaam Mar 20, 2023
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155 changes: 87 additions & 68 deletions src/components/structures/MessagePanel.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -564,7 +564,7 @@ export default class MessagePanel extends React.Component<IProps, IState> {
/**
* Find the next event in the list, and the next visible event in the list.
*
* @param event - the list of events to look in and whether they are shown
* @param events - the list of events to look in and whether they are shown
* @param i - where in the list we are now
*
* @returns { nextEvent, nextTile }
Expand All @@ -578,14 +578,14 @@ export default class MessagePanel extends React.Component<IProps, IState> {
private getNextEventInfo(
events: EventAndShouldShow[],
i: number,
): { nextEvent: MatrixEvent | null; nextTile: MatrixEvent | null } {
): { nextEventAndShouldShow: EventAndShouldShow | null; nextTile: MatrixEvent | null } {
// WARNING: this method is on a hot path.

const nextEvent = i < events.length - 1 ? events[i + 1].event : null;
const nextEventAndShouldShow = i < events.length - 1 ? events[i + 1] : null;

const nextTile = findFirstShownAfter(i, events);

return { nextEvent, nextTile };
return { nextEventAndShouldShow, nextTile };
}

private get pendingEditItem(): string | undefined {
Expand Down Expand Up @@ -615,16 +615,16 @@ export default class MessagePanel extends React.Component<IProps, IState> {

let lastShownNonLocalEchoIndex = -1;
for (let i = events.length - 1; i >= 0; i--) {
const { event: mxEv, shouldShow } = events[i];
const { event, shouldShow } = events[i];
if (!shouldShow) {
continue;
}

if (lastShownEvent === undefined) {
lastShownEvent = mxEv;
lastShownEvent = event;
}

if (mxEv.status) {
if (event.status) {
// this is a local echo
continue;
}
Expand All @@ -641,20 +641,21 @@ export default class MessagePanel extends React.Component<IProps, IState> {
// to assume that sent receipts are to be shown more often.
this.readReceiptsByEvent = {};
if (this.props.showReadReceipts) {
this.readReceiptsByEvent = this.getReadReceiptsByShownEvent();
this.readReceiptsByEvent = this.getReadReceiptsByShownEvent(events);
}

let grouper: BaseGrouper | null = null;

for (let i = 0; i < events.length; i++) {
const { event: mxEv, shouldShow } = events[i];
const eventId = mxEv.getId();
const last = mxEv === lastShownEvent;
const { nextEvent, nextTile } = this.getNextEventInfo(events, i);
const eventAndShouldShow = events[i];
const { event, shouldShow } = eventAndShouldShow;
const eventId = event.getId();
const last = event === lastShownEvent;
const { nextEventAndShouldShow, nextTile } = this.getNextEventInfo(events, i);

if (grouper) {
if (grouper.shouldGroup(mxEv)) {
grouper.add(mxEv);
if (grouper.shouldGroup(eventAndShouldShow)) {
grouper.add(eventAndShouldShow);
continue;
} else {
// not part of group, so get the group tiles, close the
Expand All @@ -666,8 +667,15 @@ export default class MessagePanel extends React.Component<IProps, IState> {
}

for (const Grouper of groupers) {
if (Grouper.canStartGroup(this, mxEv) && !this.props.disableGrouping) {
grouper = new Grouper(this, mxEv, prevEvent, lastShownEvent, nextEvent, nextTile);
if (Grouper.canStartGroup(this, eventAndShouldShow) && !this.props.disableGrouping) {
grouper = new Grouper(
this,
eventAndShouldShow,
prevEvent,
lastShownEvent,
nextEventAndShouldShow,
nextTile,
);
break; // break on first grouper
}
}
Expand All @@ -677,8 +685,8 @@ export default class MessagePanel extends React.Component<IProps, IState> {
// make sure we unpack the array returned by getTilesForEvent,
// otherwise React will auto-generate keys, and we will end up
// replacing all the DOM elements every time we paginate.
ret.push(...this.getTilesForEvent(prevEvent, mxEv, last, false, nextEvent, nextTile));
prevEvent = mxEv;
ret.push(...this.getTilesForEvent(prevEvent, event, last, false, nextEventAndShouldShow, nextTile));
prevEvent = event;
}

const readMarker = this.readMarkerForEvent(eventId, i >= lastShownNonLocalEchoIndex);
Expand All @@ -698,8 +706,8 @@ export default class MessagePanel extends React.Component<IProps, IState> {
mxEv: MatrixEvent,
last = false,
isGrouped = false,
nextEvent?: MatrixEvent,
nextEventWithTile?: MatrixEvent,
nextEvent: EventAndShouldShow | null = null,
nextEventWithTile: MatrixEvent | null = null,
): ReactNode[] {
const ret: ReactNode[] = [];

Expand Down Expand Up @@ -745,20 +753,20 @@ export default class MessagePanel extends React.Component<IProps, IState> {
const readReceipts = this.readReceiptsByEvent[eventId];

let isLastSuccessful = false;
const isSentState = (s: EventStatus): boolean => !s || s === EventStatus.SENT;
const isSentState = (s: EventStatus | null): boolean => !s || s === EventStatus.SENT;
const isSent = isSentState(mxEv.getAssociatedStatus());
const hasNextEvent = nextEvent && this.shouldShowEvent(nextEvent);
const hasNextEvent = nextEvent?.shouldShow;
if (!hasNextEvent && isSent) {
isLastSuccessful = true;
} else if (hasNextEvent && isSent && !isSentState(nextEvent.getAssociatedStatus())) {
} else if (hasNextEvent && isSent && !isSentState(nextEvent.event.getAssociatedStatus())) {
isLastSuccessful = true;
}

// This is a bit nuanced, but if our next event is hidden but a future event is not
// hidden then we're not the last successful.
if (
nextEventWithTile &&
nextEventWithTile !== nextEvent &&
nextEventWithTile !== nextEvent?.event &&
isSentState(nextEventWithTile.getAssociatedStatus())
) {
isLastSuccessful = false;
Expand Down Expand Up @@ -861,7 +869,7 @@ export default class MessagePanel extends React.Component<IProps, IState> {
// Get an object that maps from event ID to a list of read receipts that
// should be shown next to that event. If a hidden event has read receipts,
// they are folded into the receipts of the last shown event.
private getReadReceiptsByShownEvent(): Record<string, IReadReceiptProps[]> {
private getReadReceiptsByShownEvent(events: EventAndShouldShow[]): Record<string, IReadReceiptProps[]> {
const receiptsByEvent: Record<string, IReadReceiptProps[]> = {};
const receiptsByUserId: Record<
string,
Expand All @@ -872,8 +880,8 @@ export default class MessagePanel extends React.Component<IProps, IState> {
> = {};

let lastShownEventId;
for (const event of this.props.events) {
if (this.shouldShowEvent(event)) {
for (const { event, shouldShow } of events) {
if (shouldShow) {
lastShownEventId = event.getId();
}
if (!lastShownEventId) {
Expand Down Expand Up @@ -1065,7 +1073,7 @@ interface EventAndShouldShow {
}

abstract class BaseGrouper {
public static canStartGroup = (panel: MessagePanel, ev: MatrixEvent): boolean => true;
public static canStartGroup = (_panel: MessagePanel, _ev: EventAndShouldShow): boolean => true;

public events: MatrixEvent[] = [];
// events that we include in the group but then eject out and place above the group.
Expand All @@ -1074,17 +1082,20 @@ abstract class BaseGrouper {

public constructor(
public readonly panel: MessagePanel,
public readonly event: MatrixEvent,
public readonly firstEventAndShouldShow: EventAndShouldShow,
public readonly prevEvent: MatrixEvent | null,
public readonly lastShownEvent: MatrixEvent,
public readonly nextEvent?: MatrixEvent,
public readonly nextEventTile?: MatrixEvent,
public readonly lastShownEvent: MatrixEvent | undefined,
public readonly nextEvent: EventAndShouldShow | null,
public readonly nextEventTile?: MatrixEvent | null,
) {
this.readMarker = panel.readMarkerForEvent(event.getId(), event === lastShownEvent);
this.readMarker = panel.readMarkerForEvent(
firstEventAndShouldShow.event.getId(),
firstEventAndShouldShow.event === lastShownEvent,
);
}

public abstract shouldGroup(ev: MatrixEvent): boolean;
public abstract add(ev: MatrixEvent): void;
public abstract shouldGroup(ev: EventAndShouldShow): boolean;
public abstract add(ev: EventAndShouldShow): void;
public abstract getTiles(): ReactNode[];
public abstract getNewPrevEvent(): MatrixEvent;
}
Expand All @@ -1105,28 +1116,27 @@ abstract class BaseGrouper {
// Grouping only events sent by the same user that sent the `m.room.create` and only until
// the first non-state event, beacon_info event or membership event which is not regarding the sender of the `m.room.create` event
class CreationGrouper extends BaseGrouper {
public static canStartGroup = function (panel: MessagePanel, ev: MatrixEvent): boolean {
return ev.getType() === EventType.RoomCreate;
public static canStartGroup = function (_panel: MessagePanel, { event }: EventAndShouldShow): boolean {
return event.getType() === EventType.RoomCreate;
};

public shouldGroup(ev: MatrixEvent): boolean {
public shouldGroup({ event, shouldShow }: EventAndShouldShow): boolean {
const panel = this.panel;
const createEvent = this.event;
if (!panel.shouldShowEvent(ev)) {
const createEvent = this.firstEventAndShouldShow.event;
if (!shouldShow) {
return true;
}
if (panel.wantsDateSeparator(this.event, ev.getDate())) {
if (panel.wantsDateSeparator(this.firstEventAndShouldShow.event, event.getDate())) {
return false;
}
const eventType = event.getType();
if (
ev.getType() === EventType.RoomMember &&
(ev.getStateKey() !== createEvent.getSender() || ev.getContent()["membership"] !== "join")
eventType === EventType.RoomMember &&
(event.getStateKey() !== createEvent.getSender() || event.getContent()["membership"] !== "join")
) {
return false;
}

const eventType = ev.getType();

// beacons are not part of room creation configuration
// should be shown in timeline
if (M_BEACON_INFO.matches(eventType)) {
Expand All @@ -1138,17 +1148,17 @@ class CreationGrouper extends BaseGrouper {
return false;
}

if (ev.isState() && ev.getSender() === createEvent.getSender()) {
if (event.isState() && event.getSender() === createEvent.getSender()) {
return true;
}

return false;
}

public add(ev: MatrixEvent): void {
public add({ event: ev, shouldShow }: EventAndShouldShow): void {
const panel = this.panel;
this.readMarker = this.readMarker || panel.readMarkerForEvent(ev.getId(), ev === this.lastShownEvent);
if (!panel.shouldShowEvent(ev)) {
if (!shouldShow) {
return;
}
if (ev.getType() === EventType.RoomEncryption) {
Expand All @@ -1167,26 +1177,28 @@ class CreationGrouper extends BaseGrouper {
const panel = this.panel;
const ret: ReactNode[] = [];
const isGrouped = true;
const createEvent = this.event;
const createEvent = this.firstEventAndShouldShow;
const lastShownEvent = this.lastShownEvent;

if (panel.wantsDateSeparator(this.prevEvent, createEvent.getDate())) {
const ts = createEvent.getTs();
if (panel.wantsDateSeparator(this.prevEvent, createEvent.event.getDate())) {
const ts = createEvent.event.getTs();
ret.push(
<li key={ts + "~"}>
<DateSeparator roomId={createEvent.getRoomId()} ts={ts} />
<DateSeparator roomId={createEvent.event.getRoomId()} ts={ts} />
</li>,
);
}

// If this m.room.create event should be shown (room upgrade) then show it before the summary
if (panel.shouldShowEvent(createEvent)) {
if (createEvent.shouldShow) {
// pass in the createEvent as prevEvent as well so no extra DateSeparator is rendered
ret.push(...panel.getTilesForEvent(createEvent, createEvent));
ret.push(...panel.getTilesForEvent(createEvent.event, createEvent.event));
}

for (const ejected of this.ejectedEvents) {
ret.push(...panel.getTilesForEvent(createEvent, ejected, createEvent === lastShownEvent, isGrouped));
ret.push(
...panel.getTilesForEvent(createEvent.event, ejected, createEvent.event === lastShownEvent, isGrouped),
);
}

const eventTiles = this.events
Expand Down Expand Up @@ -1233,14 +1245,17 @@ class CreationGrouper extends BaseGrouper {
}

public getNewPrevEvent(): MatrixEvent {
return this.event;
return this.firstEventAndShouldShow.event;
}
}

// Wrap consecutive grouped events in a ListSummary
class MainGrouper extends BaseGrouper {
public static canStartGroup = function (panel: MessagePanel, ev: MatrixEvent): boolean {
if (!panel.shouldShowEvent(ev)) return false;
public static canStartGroup = function (
panel: MessagePanel,
{ event: ev, shouldShow }: EventAndShouldShow,
): boolean {
if (!shouldShow) return false;

if (ev.isState() && groupedStateEvents.includes(ev.getType() as EventType)) {
return true;
Expand All @@ -1259,18 +1274,18 @@ class MainGrouper extends BaseGrouper {

public constructor(
public readonly panel: MessagePanel,
public readonly event: MatrixEvent,
public readonly firstEventAndShouldShow: EventAndShouldShow,
public readonly prevEvent: MatrixEvent | null,
public readonly lastShownEvent: MatrixEvent,
nextEvent: MatrixEvent,
nextEventTile: MatrixEvent,
public readonly lastShownEvent: MatrixEvent | undefined,
nextEvent: EventAndShouldShow | null,
nextEventTile: MatrixEvent | null,
) {
super(panel, event, prevEvent, lastShownEvent, nextEvent, nextEventTile);
this.events = [event];
super(panel, firstEventAndShouldShow, prevEvent, lastShownEvent, nextEvent, nextEventTile);
this.events = [firstEventAndShouldShow.event];
}

public shouldGroup(ev: MatrixEvent): boolean {
if (!this.panel.shouldShowEvent(ev)) {
public shouldGroup({ event: ev, shouldShow }: EventAndShouldShow): boolean {
if (!shouldShow) {
// absorb hidden events so that they do not break up streams of messages & redaction events being grouped
return true;
}
Expand All @@ -1289,13 +1304,13 @@ class MainGrouper extends BaseGrouper {
return false;
}

public add(ev: MatrixEvent): void {
public add({ event: ev, shouldShow }: EventAndShouldShow): void {
if (ev.getType() === EventType.RoomMember) {
// We can ignore any events that don't actually have a message to display
if (!hasText(ev, this.panel.showHiddenEvents)) return;
}
this.readMarker = this.readMarker || this.panel.readMarkerForEvent(ev.getId(), ev === this.lastShownEvent);
if (!this.panel.showHiddenEvents && !this.panel.shouldShowEvent(ev)) {
if (!this.panel.showHiddenEvents && !shouldShow) {
// absorb hidden events to not split the summary
return;
}
Expand Down Expand Up @@ -1399,6 +1414,10 @@ const groupers = [CreationGrouper, MainGrouper];
* event that is >start items through the list, and is shown.
*/
function findFirstShownAfter(start: number, events: EventAndShouldShow[]): MatrixEvent | null {
// Note: this could be done with something like:
// events.slice(i + 1).find((e) => e.shouldShow)?.event ?? null;
// but it is ~10% slower, and this is on the critical path.

for (let n = start + 1; n < events.length; n++) {
const { event, shouldShow } = events[n];
if (shouldShow) {
Expand Down
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