73 lines
2.2 KiB
TypeScript
73 lines
2.2 KiB
TypeScript
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/*
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Copyright 2025 New Vector Ltd.
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SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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Please see LICENSE in the repository root for full details.
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*/
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import {
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type CallMembership,
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isLivekitTransport,
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type LivekitTransport,
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type MatrixRTCSession,
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MatrixRTCSessionEvent,
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} from "matrix-js-sdk/lib/matrixrtc";
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import { fromEvent, map } from "rxjs";
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import { type ObservableScope } from "./ObservableScope";
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import { type Behavior } from "./Behavior";
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export const sessionBehaviors$ = (
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scope: ObservableScope,
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matrixRTCSession: MatrixRTCSession,
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): {
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memberships$: Behavior<CallMembership[]>;
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membershipsWithTransport$: Behavior<
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{ membership: CallMembership; transport?: LivekitTransport }[]
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>;
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transports$: Behavior<LivekitTransport[]>;
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} => {
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const memberships$ = scope.behavior(
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fromEvent(
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matrixRTCSession,
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MatrixRTCSessionEvent.MembershipsChanged,
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(_, memberships: CallMembership[]) => memberships,
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),
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);
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/**
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* Lists the transports used by ourselves, plus all other MatrixRTC session
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* members. For completeness this also lists the preferred transport and
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* whether we are in multi-SFU mode or sticky events mode (because
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* advertisedTransport$ wants to read them at the same time, and bundling data
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* together when it might change together is what you have to do in RxJS to
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* avoid reading inconsistent state or observing too many changes.)
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*/
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const membershipsWithTransport$: Behavior<
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{ membership: CallMembership; transport?: LivekitTransport }[]
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> = scope.behavior(
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memberships$.pipe(
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map((memberships) => {
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return memberships.map((membership) => {
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const oldestMembership = memberships[0] ?? membership;
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const transport = membership.getTransport(oldestMembership);
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return {
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membership,
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transport: isLivekitTransport(transport) ? transport : undefined,
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};
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});
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}),
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),
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);
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const transports$ = scope.behavior(
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membershipsWithTransport$.pipe(
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map((mts) => mts.flatMap(({ transport: t }) => (t ? [t] : []))),
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),
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);
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return {
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memberships$,
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membershipsWithTransport$,
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transports$,
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};
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};
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