paella-core/src/js/core/Data.js

Multistream HTML video player

import Plugin from 'paella-core/js/core/Plugin';
import { loadPluginsOfType } from 'paella-core/js/core/plugin_tools'
import PlayerResource from 'paella-core/js/core/PlayerResource';

export class DataPlugin extends Plugin {
    get type() { return "data"; }

    get context() { return this.config.context || []; }

    async read(/* context, key */) {
        throw Error(`DataPlugin.read() not implemented in data plugin '${this.name}'`);
    }

    async write(/* context, key, data */) {
        throw Error(`DataPlugin.write() not implemented in data plugin '${this.name}'`);
    }

    async remove(/* context, key */) {
        throw Error(`DataPlugin.remove() not implemented in data plugin '${this.name}'`);
    }
}

export default class Data extends PlayerResource {
    constructor(player) {
        super(player);

        this._dataPlugins = {}

        loadPluginsOfType(this.player, "data", async (plugin) => {
            plugin.context?.forEach(ctx => {
                this._dataPlugins[ctx] = this._dataPlugins[ctx] || [];
                this._dataPlugins[ctx].push(plugin);
            });
        })
    }

    getDataPlugin(context) {
        let plugin =  this._dataPlugins[context] &&
                      this._dataPlugins[context].length > 0 &&
                      this._dataPlugins[context][0];
        if (!plugin) {
            plugin = this._dataPlugins["default"] &&
                     this._dataPlugins["default"].length > 0 &&
                     this._dataPlugins["default"][0];
        }
        if (!plugin) {
            throw Error(`No data plugin found for context '${context}'`);
        }
        return plugin;
    }

    getDataPlugins(context) {
        let plugin =  this._dataPlugins[context] &&
                      this._dataPlugins[context].length > 0 &&
                      this._dataPlugins[context];
        if (!plugin) {
            plugin = this._dataPlugins["default"] &&
                     this._dataPlugins["default"].length > 0 &&
                     this._dataPlugins["default"];
        }
        if (!plugin) {
            throw Error(`No data plugin found for context '${context}'`);
        }
        return plugin;
    }

    async read(context, key) {
        const p = this.getDataPlugin(context);
        const result = await p.read(context, key);
        return result;
    }

    async write(context, key, data) {
        const p = this.getDataPlugins(context);
        if (Array.isArray(p)) {
            let result = null;
            for (let i = 0; i<p.length; ++i) {
                result = await p[i].write(context, key, data);
            }
            return result;
        }
        else if (p) {
            const result = await p.write(context, key, data);
            return result;
        }
        else {
            this.player.log.warn(`No such data plugin found for context '${context}'`);
        }
    }

    async remove(context, key) {
        const p = this.getDataPlugins(context);
        if (p.length>1) {
            let result = null;
            for (let i = 0; i<p.length; ++i) {
                result = await p[i].remove(context, key);
            }
            return result;
        }
        else {
            const result = await p.remove(context, key);
            return result;
        }
    }
}