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fix: replace binarySearchByDateEqualOrNearestGreater with findIndexInSortedArray \w midpoint match #1370

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fix: replace binarySearchByDateEqualOrNearestGreater with findIndexInSortedArray \w midpoint match #1370

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701183f
Enable midpoint matching in findIndexInSortedArray, use it instead of…
arnautov-anton Sep 19, 2024
544753a
Adjust related tests
arnautov-anton Sep 19, 2024
d009882
fix: hide search by midpoint behind a flag
MartinCupela Oct 21, 2024
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45 changes: 13 additions & 32 deletions src/utils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -310,12 +310,18 @@ export function formatMessage<StreamChatGenerics extends ExtendableGenerics = De

export const findIndexInSortedArray = <T, L>({
needle,
returnOnMidMatch,
sortedArray,
selectValueToCompare = (e) => e,
sortDirection = 'ascending',
}: {
needle: T;
sortedArray: readonly T[];
/**
* Returns the index of the midpoint if it matches the target value.
* Should be enabled only if the searched array cannot contain duplicates.
*/
returnOnMidMatch?: boolean;
/**
* In array of objects (like messages), pick a specific
* property to compare needle value to.
Expand Down Expand Up @@ -353,7 +359,7 @@ export const findIndexInSortedArray = <T, L>({

const comparableMiddle = selectValueToCompare(sortedArray[middle]);

// if (comparableNeedle === comparableMiddle) return middle;
if (returnOnMidMatch && comparableNeedle === comparableMiddle) return middle;

if (
(sortDirection === 'ascending' && comparableNeedle < comparableMiddle) ||
Expand Down Expand Up @@ -499,36 +505,6 @@ type MessagePaginationUpdatedParams<StreamChatGenerics extends ExtendableGeneric
messagePaginationOptions?: MessagePaginationOptions;
};

export function binarySearchByDateEqualOrNearestGreater(
array: {
created_at?: string;
}[],
targetDate: Date,
): number {
let left = 0;
let right = array.length - 1;

while (left <= right) {
const mid = Math.floor((left + right) / 2);
const midCreatedAt = array[mid].created_at;
if (!midCreatedAt) {
left += 1;
continue;
}
const midDate = new Date(midCreatedAt);

if (midDate.getTime() === targetDate.getTime()) {
return mid;
} else if (midDate.getTime() < targetDate.getTime()) {
left = mid + 1;
} else {
right = mid - 1;
}
}

return left;
}

const messagePaginationCreatedAtAround = <StreamChatGenerics extends ExtendableGenerics = DefaultGenerics>({
parentSet,
requestedPageSize,
Expand Down Expand Up @@ -580,7 +556,12 @@ const messagePaginationCreatedAtAround = <StreamChatGenerics extends ExtendableG
updateHasPrev = firstPageMsgIsFirstInSet;
updateHasNext = lastPageMsgIsLastInSet;
const midPointByCount = Math.floor(returnedPage.length / 2);
const midPointByCreationDate = binarySearchByDateEqualOrNearestGreater(returnedPage, createdAtAroundDate);
const midPointByCreationDate = findIndexInSortedArray<{ created_at: Date }, number>({
needle: { created_at: createdAtAroundDate },
sortedArray: returnedPage.map(formatMessage),
sortDirection: 'ascending',
selectValueToCompare: (message) => message.created_at.getTime(),
});

if (midPointByCreationDate !== -1) {
hasPrev = midPointByCount <= midPointByCreationDate;
Expand Down
6 changes: 5 additions & 1 deletion test/unit/channel.js
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Expand Up @@ -1275,9 +1275,13 @@ describe('Channel.query', async () => {
it('should update pagination for queried message set to prevent more pagination', async () => {
const client = await getClientWithUser();
const channel = client.channel('messaging', uuidv4());
const timestamp = new Date('2024-01-01T00:00:00.000Z').getTime();

const mockedChannelQueryResponse = {
...mockChannelQueryResponse,
messages: Array.from({ length: DEFAULT_QUERY_CHANNEL_MESSAGE_LIST_PAGE_SIZE - 1 }, generateMsg),
messages: Array.from({ length: DEFAULT_QUERY_CHANNEL_MESSAGE_LIST_PAGE_SIZE - 1 }, (_, index) =>
generateMsg({ created_at: new Date(timestamp + index * 1000).toISOString() }),
),
};
const mock = sinon.mock(client);
mock.expects('post').returns(Promise.resolve(mockedChannelQueryResponse));
Expand Down
138 changes: 105 additions & 33 deletions test/unit/channel_state.js
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Expand Up @@ -97,21 +97,39 @@ describe('ChannelState addMessagesSorted', function () {

it('add a message with same created_at', async function () {
const state = new ChannelState();

for (let i = 0; i < 10; i++) {
state.addMessagesSorted([generateMsg({ id: `${i}`, date: `2020-01-01T00:00:00.00${i}Z` })]);
const pairCount = 10;
const msgCount = pairCount * 2;

for (let i = 0; i < msgCount; i += 2) {
state.addMessagesSorted([
generateMsg({ id: `${i}`, date: `2020-01-01T00:00:00.0${i.toString().padStart(2, '0')}Z` }),
generateMsg({ id: `${i + 1}`, date: `2020-01-01T00:00:00.0${i.toString().padStart(2, '0')}Z` }),
]);
}

for (let i = 10; i < state.messages.length - 1; i++) {
for (let j = i + 1; i < state.messages.length - 1; j++)
expect(state.messages[i].created_at.getTime()).to.be.lessThan(state.messages[j].created_at.getTime());
for (let i = 0; i < msgCount; i += 2) {
expect(state.messages[i].created_at.getTime()).to.be.eq(state.messages[i + 1].created_at.getTime());
if (i + 2 < msgCount) {
expect(state.messages[i].created_at.getTime()).to.be.lessThan(
state.messages[i + 2].created_at.getTime(),
);
}
}

expect(state.messages).to.have.length(10);
state.addMessagesSorted([generateMsg({ id: 'id', date: `2020-01-01T00:00:00.007Z` })]);
expect(state.messages).to.have.length(11);
expect(state.messages[7].id).to.be.equal('7');
expect(state.messages[8].id).to.be.equal('id');
expect(state.messages).to.have.length(msgCount);
state.addMessagesSorted([generateMsg({ id: '1stAdded', date: `2020-01-01T00:00:00.014Z` })]);

expect(state.messages).to.have.length(msgCount + 1);
expect(state.messages[14].id).to.be.equal('14');
expect(state.messages[15].id).to.be.equal('15');
expect(state.messages[16].id).to.be.equal('1stAdded');
state.addMessagesSorted([generateMsg({ id: '2ndAdded', date: `2020-01-01T00:00:00.014Z` })]);

expect(state.messages).to.have.length(msgCount + 2);
expect(state.messages[14].id).to.be.equal('14');
expect(state.messages[15].id).to.be.equal('15');
expect(state.messages[16].id).to.be.equal('1stAdded');
expect(state.messages[17].id).to.be.equal('2ndAdded');
});

it('add lots of messages in order', async function () {
Expand Down Expand Up @@ -208,8 +226,22 @@ describe('ChannelState addMessagesSorted', function () {

it('should add messages to new message set', () => {
const state = new ChannelState();
state.addMessagesSorted([generateMsg({ id: '12' }), generateMsg({ id: '13' }), generateMsg({ id: '14' })]);
state.addMessagesSorted([generateMsg({ id: '0' }), generateMsg({ id: '1' })], false, false, true, 'new');

state.addMessagesSorted([
generateMsg({ id: '12', created_at: '2020-01-01T00:00:00.001Z' }),
generateMsg({ id: '13', created_at: '2020-01-01T00:00:00.002Z' }),
generateMsg({ id: '14', created_at: '2020-01-01T00:00:00.003Z' }),
]);
state.addMessagesSorted(
[
generateMsg({ id: '0', created_at: '2020-01-01T00:00:00.004Z' }),
generateMsg({ id: '1', created_at: '2020-01-01T00:00:00.005Z' }),
],
false,
false,
true,
'new',
);

expect(state.messages.length).to.be.equal(3);
expect(state.messages[0].id).to.be.equal('12');
Expand All @@ -223,7 +255,11 @@ describe('ChannelState addMessagesSorted', function () {
it('should add messages to current message set', () => {
const state = new ChannelState();
state.addMessagesSorted(
[generateMsg({ id: '12' }), generateMsg({ id: '13' }), generateMsg({ id: '14' })],
[
generateMsg({ id: '12', created_at: '2020-01-01T00:00:00.001Z' }),
generateMsg({ id: '13', created_at: '2020-01-01T00:00:00.002Z' }),
generateMsg({ id: '14', created_at: '2020-01-01T00:00:00.003Z' }),
],
false,
false,
true,
Expand All @@ -239,7 +275,11 @@ describe('ChannelState addMessagesSorted', function () {
it('should add messages to latest message set', () => {
const state = new ChannelState();
state.addMessagesSorted(
[generateMsg({ id: '12' }), generateMsg({ id: '13' }), generateMsg({ id: '14' })],
[
generateMsg({ id: '12', created_at: '2020-01-01T00:00:00.001Z' }),
generateMsg({ id: '13', created_at: '2020-01-01T00:00:00.002Z' }),
generateMsg({ id: '14', created_at: '2020-01-01T00:00:00.003Z' }),
],
false,
false,
true,
Expand All @@ -258,17 +298,37 @@ describe('ChannelState addMessagesSorted', function () {

it(`should add messages to latest message set when it's not currently active`, () => {
const state = new ChannelState();

state.addMessagesSorted(
[generateMsg({ id: '12' }), generateMsg({ id: '13' }), generateMsg({ id: '14' })],
[
generateMsg({ id: '12', created_at: '2020-01-01T00:00:00.001Z' }),
generateMsg({ id: '13', created_at: '2020-01-01T00:00:00.002Z' }),
generateMsg({ id: '14', created_at: '2020-01-01T00:00:00.003Z' }),
],
false,
false,
true,
'latest',
);
state.addMessagesSorted([generateMsg({ id: '0' }), generateMsg({ id: '1' })], false, false, true, 'new');
state.addMessagesSorted(
[
generateMsg({ id: '0', created_at: '2020-01-01T00:00:00.004Z' }),
generateMsg({ id: '1', created_at: '2020-01-01T00:00:00.005Z' }),
],
false,
false,
true,
'new',
);
state.messageSets[0].isCurrent = false;
state.messageSets[1].isCurrent = true;
state.addMessagesSorted([generateMsg({ id: '15' })], false, false, true, 'latest');
state.addMessagesSorted(
[generateMsg({ id: '15', created_at: '2020-01-01T00:00:00.006Z' })],
false,
false,
true,
'latest',
);

expect(state.latestMessages.length).to.be.equal(4);
expect(state.latestMessages[3].id).to.be.equal('15');
Expand Down Expand Up @@ -684,10 +744,10 @@ describe('deleteUserMessages', () => {
const user1 = generateUser();
const user2 = generateUser();

const m1u1 = generateMsg({ user: user1 });
const m2u1 = generateMsg({ user: user1 });
const m1u2 = generateMsg({ user: user2 });
const m2u2 = generateMsg({ user: user2 });
const m1u1 = generateMsg({ user: user1, created_at: '2020-01-01T00:00:00.001Z' });
const m2u1 = generateMsg({ user: user1, created_at: '2020-01-01T00:00:00.002Z' });
const m1u2 = generateMsg({ user: user2, created_at: '2020-01-01T00:00:00.003Z' });
const m2u2 = generateMsg({ user: user2, created_at: '2020-01-01T00:00:00.004Z' });

state.addMessagesSorted([m1u1, m2u1, m1u2, m2u2]);

Expand Down Expand Up @@ -719,10 +779,10 @@ describe('deleteUserMessages', () => {
const user1 = generateUser();
const user2 = generateUser();

const m1u1 = generateMsg({ user: user1 });
const m2u1 = generateMsg({ user: user1 });
const m1u2 = generateMsg({ user: user2 });
const m2u2 = generateMsg({ user: user2 });
const m1u1 = generateMsg({ user: user1, created_at: '2020-01-01T00:00:00.001Z' });
const m2u1 = generateMsg({ user: user1, created_at: '2020-01-01T00:00:00.002Z' });
const m1u2 = generateMsg({ user: user2, created_at: '2020-01-01T00:00:00.003Z' });
const m2u2 = generateMsg({ user: user2, created_at: '2020-01-01T00:00:00.004Z' });

state.addMessagesSorted([m1u1, m2u1, m1u2, m2u2]);
expect(state.messages).to.have.length(4);
Expand Down Expand Up @@ -755,10 +815,10 @@ describe('updateUserMessages', () => {
let user1 = generateUser();
const user2 = generateUser();

const m1u1 = generateMsg({ user: user1 });
const m2u1 = generateMsg({ user: user1 });
const m1u2 = generateMsg({ user: user2 });
const m2u2 = generateMsg({ user: user2 });
const m1u1 = generateMsg({ user: user1, created_at: '2020-01-01T00:00:00.001Z' });
const m2u1 = generateMsg({ user: user1, created_at: '2020-01-01T00:00:00.002Z' });
const m1u2 = generateMsg({ user: user2, created_at: '2020-01-01T00:00:00.003Z' });
const m2u2 = generateMsg({ user: user2, created_at: '2020-01-01T00:00:00.004Z' });

state.addMessagesSorted([m1u1, m2u1, m1u2, m2u2]);

Expand All @@ -785,7 +845,11 @@ describe('updateUserMessages', () => {
describe('latestMessages', () => {
it('should return latest messages - if they are the current message set', () => {
const state = new ChannelState();
const messages = [generateMsg({ id: '1' }), generateMsg({ id: '2' }), generateMsg({ id: '3' })];
const messages = [
generateMsg({ id: '1', created_at: '2020-01-01T00:00:00.001Z' }),
generateMsg({ id: '2', created_at: '2020-01-01T00:00:00.002Z' }),
generateMsg({ id: '3', created_at: '2020-01-01T00:00:00.003Z' }),
];
state.addMessagesSorted(messages);

expect(state.latestMessages.length).to.be.equal(messages.length);
Expand All @@ -796,7 +860,11 @@ describe('latestMessages', () => {

it('should return latest messages - if they are not the current message set', () => {
const state = new ChannelState();
const latestMessages = [generateMsg({ id: '1' }), generateMsg({ id: '2' }), generateMsg({ id: '3' })];
const latestMessages = [
generateMsg({ id: '1', created_at: '2020-01-01T00:00:00.001Z' }),
generateMsg({ id: '2', created_at: '2020-01-01T00:00:00.002Z' }),
generateMsg({ id: '3', created_at: '2020-01-01T00:00:00.003Z' }),
];
state.addMessagesSorted(latestMessages);
const newMessages = [generateMsg({ id: '0' })];
state.addMessagesSorted(newMessages, false, true, true, 'new');
Expand All @@ -811,7 +879,11 @@ describe('latestMessages', () => {

it('should return latest messages - if they are not the current message set and new messages received', () => {
const state = new ChannelState();
const latestMessages = [generateMsg({ id: '1' }), generateMsg({ id: '2' }), generateMsg({ id: '3' })];
const latestMessages = [
generateMsg({ id: '1', created_at: '2020-01-01T00:00:00.001Z' }),
generateMsg({ id: '2', created_at: '2020-01-01T00:00:00.002Z' }),
generateMsg({ id: '3', created_at: '2020-01-01T00:00:00.003Z' }),
];
state.addMessagesSorted(latestMessages);
const newMessages = [generateMsg({ id: '0' })];
state.addMessagesSorted(newMessages, false, true, true, 'new');
Expand Down
20 changes: 0 additions & 20 deletions test/unit/utils.js
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Expand Up @@ -2690,23 +2690,3 @@ describe('messageSetPagination', () => {
});
});
});

describe('', () => {
const messages = [
{ created_at: '2024-08-05T08:55:00.199808Z', id: '0' },
{ created_at: '2024-08-05T08:55:01.199808Z', id: '1' },
{ created_at: '2024-08-05T08:55:02.199808Z', id: '2' },
{ created_at: '2024-08-05T08:55:03.199808Z', id: '3' },
{ created_at: '2024-08-05T08:55:04.199808Z', id: '4' },
{ created_at: '2024-08-05T08:55:05.199808Z', id: '5' },
{ created_at: '2024-08-05T08:55:06.199808Z', id: '6' },
{ created_at: '2024-08-05T08:55:07.199808Z', id: '7' },
{ created_at: '2024-08-05T08:55:08.199808Z', id: '8' },
];
it('finds the nearest newer item', () => {
expect(binarySearchByDateEqualOrNearestGreater(messages, new Date('2024-08-05T08:55:02.299808Z'))).to.eql(3);
});
it('finds the nearest matching item', () => {
expect(binarySearchByDateEqualOrNearestGreater(messages, new Date('2024-08-05T08:55:07.199808Z'))).to.eql(7);
});
});
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Moved to utils.test.ts with additions.

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