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only filter conditions if one is given; namespace events to avoid conflicts

This commit is contained in:
Iuri Matias 2019-08-19 14:24:17 -04:00
parent f05a04fbc1
commit 3c4ceabeca
1 changed files with 24 additions and 14 deletions
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38
src/eventSyncer.js
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@ -3,6 +3,10 @@ const { throttle, filter } = require('rxjs/operators');
const loki = require('lokijs')
const Events = require('events')
function randomString() {
return Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15);
}
class EventSyncer {
constructor(web3) {
@ -48,6 +52,7 @@ class EventSyncer {
trackEvent(contractInstance, eventName, filterConditions) {
// let eventKey = eventName + "-from0x123";
let eventKey = eventName;
let namespace = randomString()
let tracked = this.db.getCollection('tracked')
let lastEvent = tracked.find({ "eventName": eventName })[0]
@ -66,29 +71,31 @@ class EventSyncer {
sub.next(previous)
}
let contractObserver = fromEvent(this.events, "event-" + eventName)
let contractObserver = fromEvent(this.events, "event-" + eventName + "-" + namespace)
// 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], [(filterConditions || {fromBlock: 0}), (err, event) => {
let propsToFilter = [];
for (let prop in filterConditions.filter) {
if (Object.keys(event.returnValues).indexOf(prop) >= 0) {
propsToFilter.push(prop)
if (filterConditions) {
let propsToFilter = [];
for (let prop in filterConditions.filter) {
if (Object.keys(event.returnValues).indexOf(prop) >= 0) {
propsToFilter.push(prop)
}
}
if (propsToFilter.length === 0) {
return this.events.emit("event-" + eventName + "-" + namespace, event);
}
}
if (propsToFilter.length === 0) {
return this.events.emit("event-" + eventName, event);
}
for (let prop of propsToFilter) {
if (filterConditions.filter[prop] !== event.returnValues[prop]) {
return;
for (let prop of propsToFilter) {
if (filterConditions.filter[prop] !== event.returnValues[prop]) {
return;
}
}
}
this.events.emit("event-" + eventName, event);
this.events.emit("event-" + eventName + "-" + namespace, event);
}])
// contractObserver.pipe(filter((x) => x.id > lastEvent.id)).pipe(filter(filterConditions)).subscribe((e) => {
@ -100,12 +107,15 @@ class EventSyncer {
console.dir("event already synced: " + e.id)
} else {
// TODO: would be nice if trackEvent was smart enough to understand the type of returnValues and do the needed conversions
if (e.returnValues['$loki']) { // was already saved / synced
console.dir("already synced")
return sub.next(e.returnValues)
}
children.insert(e.returnValues)
tracked.updateWhere(((x) => x.eventName === eventName), ((x) => x.id = e.id))
this.events.emit("updateDB")
sub.next(e.returnValues)
}
console.dir("-------");
})
return sub;