@waku/rln/dist/contract/rln_contract.js

RLN (Rate Limiting Nullifier) implementation for Waku

import { Logger } from "@waku/utils";
import { hexToBytes } from "@waku/utils/bytes";
import { ethers } from "ethers";
import { MerkleRootTracker } from "../root_tracker.js";
import { BytesUtils } from "../utils/bytes.js";
import { RLNBaseContract } from "./rln_base_contract.js";
const log = new Logger("waku:rln:contract");
export class RLNContract extends RLNBaseContract {
    instance;
    merkleRootTracker;
    /**
     * Asynchronous initializer for RLNContract.
     * Allows injecting a mocked contract for testing purposes.
     */
    static async init(rlnInstance, options) {
        const rlnContract = new RLNContract(rlnInstance, options);
        return rlnContract;
    }
    constructor(rlnInstance, options) {
        super(options);
        this.instance = rlnInstance;
        const initialRoot = rlnInstance.zerokit.getMerkleRoot();
        this.merkleRootTracker = new MerkleRootTracker(5, initialRoot);
    }
    processEvents(events) {
        const toRemoveTable = new Map();
        const toInsertTable = new Map();
        events.forEach((evt) => {
            if (!evt.args) {
                return;
            }
            if (evt.event === "MembershipErased" ||
                evt.event === "MembershipExpired") {
                let index = evt.args.index;
                if (!index) {
                    return;
                }
                if (typeof index === "number" || typeof index === "string") {
                    index = ethers.BigNumber.from(index);
                }
                else {
                    log.error("Index is not a number or string", {
                        index,
                        event: evt
                    });
                    return;
                }
                const toRemoveVal = toRemoveTable.get(evt.blockNumber);
                if (toRemoveVal != undefined) {
                    toRemoveVal.push(index.toNumber());
                    toRemoveTable.set(evt.blockNumber, toRemoveVal);
                }
                else {
                    toRemoveTable.set(evt.blockNumber, [index.toNumber()]);
                }
            }
            else if (evt.event === "MembershipRegistered") {
                let eventsPerBlock = toInsertTable.get(evt.blockNumber);
                if (eventsPerBlock == undefined) {
                    eventsPerBlock = [];
                }
                eventsPerBlock.push(evt);
                toInsertTable.set(evt.blockNumber, eventsPerBlock);
            }
        });
        this.removeMembers(this.instance, toRemoveTable);
        this.insertMembers(this.instance, toInsertTable);
    }
    insertMembers(rlnInstance, toInsert) {
        toInsert.forEach((events, blockNumber) => {
            events.forEach((evt) => {
                if (!evt.args)
                    return;
                const _idCommitment = evt.args.idCommitment;
                let index = evt.args.index;
                if (!_idCommitment || !index) {
                    return;
                }
                if (typeof index === "number" || typeof index === "string") {
                    index = ethers.BigNumber.from(index);
                }
                const idCommitment = BytesUtils.zeroPadLE(hexToBytes(_idCommitment), 32);
                rlnInstance.zerokit.insertMember(idCommitment);
                const numericIndex = index.toNumber();
                this._members.set(numericIndex, {
                    index,
                    idCommitment: _idCommitment
                });
            });
            const currentRoot = rlnInstance.zerokit.getMerkleRoot();
            this.merkleRootTracker.pushRoot(blockNumber, currentRoot);
        });
    }
    removeMembers(rlnInstance, toRemove) {
        const removeDescending = new Map([...toRemove].reverse());
        removeDescending.forEach((indexes, blockNumber) => {
            indexes.forEach((index) => {
                if (this._members.has(index)) {
                    this._members.delete(index);
                    rlnInstance.zerokit.deleteMember(index);
                }
            });
            this.merkleRootTracker.backFill(blockNumber);
        });
    }
}
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