@ceramicnetwork/core/lib/pubsub/message-bus.js

Typescript implementation of the Ceramic protocol

import { buildQueryMessage, MsgType } from './pubsub-message.js';
import { Observable, Subject, Subscription, empty, pipe, } from 'rxjs';
import { filter, map, takeUntil, tap } from 'rxjs/operators';
import { OutstandingQueries, Query } from './outstanding-queries.js';
export const MAX_RESPONSE_INTERVAL = 300;
function betweenTimeout(betweenMs) {
    const stop = new Subject();
    let trigger = undefined;
    return pipe(tap(() => {
        if (trigger)
            clearTimeout(trigger);
        trigger = setTimeout(() => {
            stop.next(true);
        }, betweenMs);
    }), takeUntil(stop));
}
export class MessageBus extends Observable {
    constructor(pubsub, peerSyncDisabled) {
        super((subscriber) => {
            this.feed$.subscribe(subscriber);
        });
        this.pubsub = pubsub;
        this.peerSyncDisabled = peerSyncDisabled;
        this.outstandingQueries = new OutstandingQueries();
        this.feed$ = new Subject();
        this.pubsubSubscription = this.pubsub.subscribe(this.feed$);
    }
    get closed() {
        return this.feed$.isStopped;
    }
    next(message) {
        if (this.closed) {
            return Subscription.EMPTY;
        }
        else {
            return this.pubsub.next(message);
        }
    }
    queryNetwork(streamId) {
        if (this.peerSyncDisabled) {
            return empty();
        }
        const queryMessage = buildQueryMessage(streamId);
        this.next(queryMessage);
        const timeNow = Date.now();
        const query = new Query(timeNow, streamId, queryMessage.id);
        this.outstandingQueries.add(queryMessage.id, query);
        return this.pipe(filter((message) => message.typ === MsgType.RESPONSE && message.id === queryMessage.id), map((message) => message.tips.get(streamId.toString())), filter((tip) => !!tip), betweenTimeout(MAX_RESPONSE_INTERVAL));
    }
    unsubscribe() {
        this.pubsubSubscription.unsubscribe();
        this.feed$.complete();
    }
}
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