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subspace
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move event syncing to its own module; use ReplaySubject instead of Subject

This commit is contained in:
Iuri Matias 2019-06-01 23:16:26 -04:00
parent 49958853e5
commit 17fbaab75c
2 changed files with 63 additions and 42 deletions
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54
src/eventSyncer.js Normal file
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@ -0,0 +1,54 @@
const { Observable, fromEvent, interval, Subject, ReplaySubject } = require('rxjs');
const { throttle, throttleTime, map, distinctUntilChanged, filter, average, reduce, count, scan } = require('rxjs/operators');
class EventSyncer {
constructor(db, events) {
this.db = db;
this.events = events;
}
trackEvent(eventName, filterConditions) {
let eventKey = eventName + "-from0x123";
let tracked = this.db.getCollection('tracked')
let lastEvent = tracked.find({ "eventName": eventName })[0]
if (!lastEvent || lastEvent.length <= 0) {
tracked.insert({ "eventName": eventName, id: 0 })
lastEvent = tracked.find({ "eventName": eventName })[0]
}
console.dir("last id was " + lastEvent.id)
let sub = new ReplaySubject();
let children = this.db.getCollection('children')
for (let previous of children.find({ 'eventKey': eventKey })) {
console.dir("checking previous event: " + previous.id)
sub.next(previous)
}
console.dir("after")
let contractObserver = fromEvent(this.events, eventName)
contractObserver.pipe(filter((x) => x.id > lastEvent.id)).pipe(filter(filterConditions)).subscribe((e) => {
console.dir("------- syncing event");
e.eventKey = eventKey
console.dir(e);
if (children.find({ 'id': e.id }).length > 0) {
console.dir("event already synced: " + e.id)
} else {
children.insert(e)
tracked.updateWhere(((x) => x.eventName === eventName), ((x) => x.id = e.id))
this.events.emit("updateDB")
sub.next(e)
}
console.dir("-------");
})
return sub;
}
}
module.exports = EventSyncer;

51
src/index.js
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@ -1,12 +1,12 @@
// var Web3 = require('web3')
const Events = require('events')
const events = new Events()
const Simulator = require('./simulator.js')
const simulator = new Simulator(events);
const { Observable, fromEvent, interval, Subject } = require('rxjs');
const { throttle, throttleTime, map, distinctUntilChanged, filter, average, reduce, count, scan } = require('rxjs/operators');
const Simulator = require('./simulator.js')
const EventSyncer = require('./eventSyncer.js')
var loki = require('lokijs')
//var db = new loki('loki.json', {autosave: true, autoload: true})
@ -18,6 +18,10 @@ var db = new loki('phoenix.db', {
})
//db.loadDatabase()
const events = new Events()
const simulator = new Simulator(events);
const eventSyncer = new EventSyncer(db, events);
function databaseInitialize() {
let children = db.getCollection('children')
if (!children) {
@ -47,43 +51,6 @@ function run() {
db.saveDatabase()
})
function trackEvent(eventName, filterConditions) {
let eventKey = eventName + "-from0x123";
let lastEvent = tracked.find({ "eventName": eventName })[0]
if (!lastEvent || lastEvent.length <= 0) {
tracked.insert({ "eventName": eventName, id: 0 })
lastEvent = tracked.find({ "eventName": eventName })[0]
}
console.dir("last id was " + lastEvent.id)
let sub = new Subject();
for (let previous of children.find({ 'eventKey': eventKey })) {
console.dir("checking previous event: " + previous.id)
sub.next(previous)
}
let contractObserver = fromEvent(events, eventName)
contractObserver.pipe(filter((x) => x.id > lastEvent.id)).pipe(filter(filterConditions)).subscribe((e) => {
console.dir("------- syncing event");
e.eventKey = eventKey
console.dir(e);
if (children.find({ 'id': e.id }).length > 0) {
console.dir("event already synced: " + e.id)
} else {
children.insert(e)
tracked.updateWhere(((x) => x.eventName === eventName), ((x) => x.id = e.id))
events.emit("updateDB")
sub.next(e)
}
console.dir("-------");
})
return sub;
}
let myscan = scan((acc, curr) => {
acc.push(curr);
if (acc.length > 4) {
@ -94,7 +61,7 @@ function run() {
let mymap = map(arr => arr.reduce((acc, current) => acc + current, 0) / arr.length)
trackEvent('contractEvent', ((x) => x.from === "0x123")).pipe(map(x => x.rating), myscan, mymap).subscribe((v) => {
eventSyncer.trackEvent('contractEvent', ((x) => x.from === "0x123")).pipe(map(x => x.rating), myscan, mymap).subscribe((v) => {
console.dir("current value is " + v)
})