78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
import { Actor } from './actor.js';
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import { Graph, Vertex } from './graph.js';
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import params from './params.js';
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class PostVertex extends Vertex {
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constructor(forum, authorId, postContent) {
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super();
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this.forum = forum;
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this.id = postContent.id;
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this.authorId = authorId;
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this.citations = postContent.citations;
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this.value = 0;
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}
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onValidate({ tokensMinted }) {
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this.value = params.initialPostValueFunction({ tokensMinted });
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this.forum.distributeReputation(this, this.value);
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}
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}
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/**
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* Purpose: Maintain a directed, acyclic, weighted graph of posts referencing other posts
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*/
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export class Forum extends Actor {
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constructor(bench, name, scene) {
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super(name, scene);
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this.bench = bench;
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this.posts = new Graph();
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}
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async addPost(authorId, postContent) {
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const post = new PostVertex(this, authorId, postContent);
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this.posts.addVertex(post.id, post);
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for (const { postId: citedPostId, weight } of postContent.citations) {
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this.posts.addEdge('citation', post.id, citedPostId, { weight });
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}
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}
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getPost(postId) {
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return this.posts.getVertexData(postId);
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}
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getPosts() {
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return this.posts.getVertices();
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}
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distributeReputation(post, amount, depth = 0) {
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console.log('distributeReputation', { post, amount, depth });
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// Add the given value to the current post
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post.value += amount;
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// Distribute a fraction of the added value among cited posts
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const distributeAmongCitations = amount * params.citationFraction;
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// Here we allow an arbitrary scale for the amount of the citations.
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// We normalize by dividing each by the total.
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const totalWeight = post.citations
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?.map(({ weight }) => weight)
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.reduce((acc, cur) => (acc += cur), 0);
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for (const {
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to: citedPostId,
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data: { weight },
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} of post.getEdges('citation', true)) {
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const citedPost = this.getPost(citedPostId);
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if (!citedPost) {
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throw new Error(
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`Post ${post.postId} cites unknown post ${citedPostId}`,
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);
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}
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this.distributeReputation(
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citedPost,
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(weight / totalWeight) * distributeAmongCitations,
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depth + 1,
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);
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}
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}
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}
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