@ceramicnetwork/core/lib/pubsub/outstanding-queries.js

Typescript implementation of the Ceramic protocol

import { PriorityQueue } from '@datastructures-js/priority-queue';
export class Query {
    constructor(timestamp, streamID, queryID) {
        this.timestamp = timestamp;
        this.streamID = streamID;
        this.queryID = queryID;
    }
}
const compareQueryTimestamps = (a, b) => {
    if (a.timestamp > b.timestamp) {
        return 1;
    }
    if (a.timestamp < b.timestamp) {
        return -1;
    }
    return -1;
};
export class OutstandingQueries {
    constructor() {
        this.queryQueue = new PriorityQueue(compareQueryTimestamps);
        this.queryMap = new Map();
        this._minutesThreshold = 1;
    }
    add(id, query) {
        this._cleanUpExpiredQueries();
        if (this.queryMap.get(id) == undefined) {
            this.queryMap.set(id, query);
            this.queryQueue.enqueue(query);
        }
        else {
            this.remove(query);
            this.queryMap.set(id, query);
            this.queryQueue.enqueue(query);
        }
    }
    remove(topQuery) {
        this.queryMap.delete(topQuery.queryID);
        this.queryQueue.dequeue();
    }
    _isExpired(query) {
        const diffMs = Date.now() - query?.timestamp;
        const differenceInMinutes = Math.floor(diffMs / 1000 / 60);
        return differenceInMinutes > this._minutesThreshold;
    }
    _cleanUpExpiredQueries() {
        while (this._isExpired(this.queryQueue.front())) {
            this.remove(this.queryQueue.front());
        }
    }
}
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