98 lines
3.2 KiB
JavaScript
98 lines
3.2 KiB
JavaScript
const MerkleTree = require('fixed-merkle-tree')
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const { redisUrl, rpcUrl, minerMerkleTreeHeight, minerAddress } = require('../config')
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const { poseidonHash2 } = require('./utils')
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const { toBN } = require('web3-utils')
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const Redis = require('ioredis')
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const redis = new Redis(redisUrl)
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const Web3 = require('web3')
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const web3 = new Web3(rpcUrl)
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const contract = new web3.eth.Contract(require('../abis/mining.abi.json'), minerAddress)
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let tree, eventSubscription, blockSubscription
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// todo handle the situation when we have two rewards in one block
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async function fetchEvents(from = 0, to = 'latest') {
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const events = await contract.getPastEvents('NewAccount', {
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fromBlock: from,
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toBlock: to,
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})
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return events
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.sort((a, b) => a.returnValues.index - b.returnValues.index)
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.map(e => toBN(e.returnValues.commitment))
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}
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async function processNewEvent(err, event) {
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if (err) {
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throw new Error(`Event handler error: ${err}`)
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// console.error(err)
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// return
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}
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console.log('New account event', event.returnValues)
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const { commitment, index } = event.returnValues
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if (tree.elements().length === Number(index)) {
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tree.insert(toBN(commitment))
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await updateRedis()
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} else if (tree.elements().length === Number(index) + 1) {
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console.log('Replacing element', index)
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tree.update(index, toBN(commitment))
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await updateRedis()
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} else {
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console.log(`Invalid element index ${index}, rebuilding tree`)
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await rebuild()
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}
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}
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async function processNewBlock(err) {
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if (err) {
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throw new Error(`Event handler error: ${err}`)
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// console.error(err)
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// return
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}
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// what if updateRedis takes more than 15 sec?
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await updateRedis()
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}
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async function updateRedis() {
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const rootOnContract = await contract.methods.getLastAccountRoot().call()
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if (!tree.root().eq(toBN(rootOnContract))) {
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console.log(`Invalid tree root: ${tree.root()} != ${toBN(rootOnContract)}, rebuilding tree`)
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await rebuild()
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return
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}
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const rootInRedis = await redis.get('tree:root')
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if (!rootInRedis || !tree.root().eq(toBN(rootInRedis))) {
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const serializedTree = JSON.stringify(tree.serialize())
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await redis.set('tree:elements', serializedTree)
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await redis.set('tree:root', tree.root().toString())
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await redis.publish('treeUpdate', tree.root().toString())
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console.log('Updated tree in redis, new root:', tree.root().toString())
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} else {
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console.log('Tree in redis is up to date, skipping update')
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}
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}
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async function rebuild() {
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await eventSubscription.unsubscribe()
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await blockSubscription.unsubscribe()
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setTimeout(init, 3000)
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}
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async function init() {
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console.log('Initializing')
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const block = await web3.eth.getBlockNumber()
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const events = await fetchEvents(0, block)
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tree = new MerkleTree(minerMerkleTreeHeight, events, { hashFunction: poseidonHash2 })
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console.log(`Rebuilt tree with ${events.length} elements, root: ${tree.root()}`)
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eventSubscription = contract.events.NewAccount({ fromBlock: block + 1 }, processNewEvent)
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blockSubscription = web3.eth.subscribe('newBlockHeaders', processNewBlock)
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await updateRedis()
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}
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init()
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process.on('unhandledRejection', error => {
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console.error('Unhandled promise rejection', error)
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process.exit(1)
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})
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