sites-blog/app/services/venue.js

// venue.js
// Copyright (C) 2022 Digital Telepresence, LLC
// License: Apache-2.0

'use strict';

const fetch = require('node-fetch'); // jshint ignore:line

const CACHE_DURATION = 60 * 5;

const { SiteService, SiteError } = require('../../lib/site-lib');

class VenueService extends SiteService {

  constructor (dtp) {
    super(dtp, module.exports);
  }

  channelMiddleware ( ) {
    return async (req, res, next) => {
      try {
        if (!res.locals.site || !res.locals.site.shingChannelSlug) {
          return next();
        }
        res.locals.shingChannelFeed = await this.getChannelFeed(res.locals.site.shingChannelSlug, { allowCache: true });
        res.locals.shingChannelStatus = await this.getChannelStatus(res.locals.site.shingChannelSlug, { allowCache: true });
        this.log.debug('channel status', { status: res.locals.shingChannelStatus });
        return next();
      } catch (error) {
        this.log.error('failed to populate Shing.tv channel feed', { error });
        return next();
      }
    };
  }

  async getChannelFeed (channelSlug, options) {
    const { cache: cacheService } = this.dtp.services;
    const cacheKey = `venue:ch:${channelSlug}`;
    options = Object.assign({ allowCache: true }, options);

    let json;
    if (options.allowCache) {
      json = await cacheService.getObject(cacheKey);
      if (json) { return json; }
    }

    this.log.info('fetching Shing channel feed', { channelSlug });
    const response = await fetch(`https://shing.tv/channel/${channelSlug}/feed/json`);
    if (!response.ok) {
      throw new SiteError(500, 'Failed to fetch Shing channel feed');
    }

    json = await response.json();
    await cacheService.setObjectEx(cacheKey, CACHE_DURATION, json);

    return json;
  }

  async getChannelStatus (channelSlug, options) {
    const { cache: cacheService } = this.dtp.services;
    const cacheKey = `venue:ch:${channelSlug}:status`;
    options = Object.assign({ allowCache: true }, options);

    let json;
    if (options.allowCache) {
      json = await cacheService.getObject(cacheKey);
      if (json) { return json; }
    }

    this.log.info('fetching Shing channel status', { channelSlug });
    const response = await fetch(`https://shing.tv/channel/${channelSlug}/status`);
    if (!response.ok) {
      throw new SiteError(500, 'Failed to fetch Shing channel status');
    }

    json = await response.json();

    const { channel } = json;
    await cacheService.setObjectEx(cacheKey, 10, channel);

    return channel;
  }
}

module.exports = {
  slug: 'venue',
  name: 'venue',
  create: (dtp) => { return new VenueService(dtp); },
};