trackEvent working with real contracts & events

This commit is contained in:
Iuri Matias 2019-08-09 16:03:15 -04:00
parent 33698532ec
commit 3e8a6a244d
3 changed files with 66 additions and 10 deletions

View File

@ -1,11 +1,14 @@
const { fromEvent, interval, ReplaySubject } = require('rxjs'); const { fromEvent, interval, ReplaySubject } = require('rxjs');
const { throttle, filter } = require('rxjs/operators'); const { throttle, filter } = require('rxjs/operators');
const loki = require('lokijs') const loki = require('lokijs')
const Events = require('events')
class EventSyncer { class EventSyncer {
constructor(events) { constructor(web3) {
this.events = events; // this.events = events;
this.events = new Events;
this.web3 = web3;
} }
init(cb) { init(cb) {
@ -41,7 +44,8 @@ class EventSyncer {
cb(); cb();
} }
trackEvent(eventName, filterConditions) { // trackEvent(eventName, filterConditions) {
trackEvent(contractInstance, eventName, filterConditions) {
// let eventKey = eventName + "-from0x123"; // let eventKey = eventName + "-from0x123";
let eventKey = eventName; let eventKey = eventName;
@ -62,18 +66,30 @@ class EventSyncer {
sub.next(previous) sub.next(previous)
} }
let contractObserver = fromEvent(this.events, eventName) let contractObserver = fromEvent(this.events, "event-" + eventName)
contractObserver.pipe(filter((x) => x.id > lastEvent.id)).pipe(filter(filterConditions)).subscribe((e) => {
// TODO: this should be moved to a 'smart' module
// for e.g, it should start fromBlock, from the latest known block (which means it should store block info)
// it should be able to do events X at the time to avoid slow downs as well as the 10k limit
contractInstance.events[eventName].apply(contractInstance.events[eventName], [{fromBlock: 0}, (err, event) => {
// let eventObject = event.returnValues;
// eventObject.id = event.id;
this.events.emit("event-" + eventName, event);
}])
// contractObserver.pipe(filter((x) => x.id > lastEvent.id)).pipe(filter(filterConditions)).subscribe((e) => {
contractObserver.pipe().subscribe((e) => {
console.dir("------- syncing event"); console.dir("------- syncing event");
e.eventKey = eventKey e.eventKey = eventKey
console.dir(e); // console.dir(e);
if (children.find({ 'id': e.id }).length > 0) { if (children.find({ 'id': e.id }).length > 0) {
console.dir("event already synced: " + e.id) console.dir("event already synced: " + e.id)
} else { } else {
children.insert(e) // TODO: would be nice if trackEvent was smart enough to understand the type of returnValues and do the needed conversions
children.insert(e.returnValues)
tracked.updateWhere(((x) => x.eventName === eventName), ((x) => x.id = e.id)) tracked.updateWhere(((x) => x.eventName === eventName), ((x) => x.id = e.id))
this.events.emit("updateDB") this.events.emit("updateDB")
sub.next(e) sub.next(e.returnValues)
} }
console.dir("-------"); console.dir("-------");
}) })

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@ -0,0 +1,12 @@
const EventSyncer = require('./eventSyncer.js')
const eventSyncer = new EventSyncer(web3);
eventSyncer.init(() => {});
// eventSyncer.trackEvent('contractEvent', ((x) => x.from === "0x123")).pipe(map(x => x.rating), myscan, mymap).subscribe((v) => {
// console.dir("current average is " + v)
// })
// return Event

View File

@ -1,7 +1,18 @@
const { map, scan } = require('rxjs/operators');
const Web3 = require('web3'); const Web3 = require('web3');
let web3 = new Web3("ws://localhost:8545"); let web3 = new Web3("ws://localhost:8545");
let myscan = scan((acc, curr) => {
acc.push(curr);
if (acc.length > 4) {
acc.shift();
}
return acc;
}, [])
let mymap = map(arr => arr.reduce((acc, current) => acc + current, 0) / arr.length)
async function deployContract() { async function deployContract() {
let accounts = await web3.eth.getAccounts(); let accounts = await web3.eth.getAccounts();
@ -74,10 +85,27 @@ async function run() {
// RatingContract.events.getPastEvents('Rating', {fromBlock: 1}) // RatingContract.events.getPastEvents('Rating', {fromBlock: 1})
RatingContract.events.Rating({fromBlock: 1}, (err, event) => { RatingContract.events.Rating({fromBlock: 1}, (err, event) => {
console.dir("new event") // console.dir("new event")
console.dir(event) // console.dir(event)
}) })
const EventSyncer = require('../src/eventSyncer.js')
const eventSyncer = new EventSyncer(web3);
eventSyncer.init(() => {
eventSyncer.trackEvent(RatingContract, 'Rating', ((x) => true)).pipe(map(x => parseInt(x.rating)), myscan, mymap).subscribe((v) => {
// eventSyncer.trackEvent(RatingContract, 'Rating', ((x) => true)).pipe(map(x => x.rating)).subscribe((v) => {
console.dir("value is ")
console.dir(v)
});
});
// await RatingContract.methods.doRating(1, 5).send({from: accounts[0]})
// await RatingContract.methods.doRating(1, 3).send({from: accounts[0]})
// await RatingContract.methods.doRating(1, 1).send({from: accounts[0]})
// await RatingContract.methods.doRating(1, 5).send({from: accounts[0]})
} }
run() run()