@push.rocks/smartdata
Version:
An advanced library for NoSQL data organization and manipulation using TypeScript with support for MongoDB, data validation, collections, and custom data types.
260 lines • 24.4 kB
JavaScript
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import * as plugins from './smartdata.plugins.js';
import { SmartdataDb } from './smartdata.classes.db.js';
import { managed, setDefaultManagerForDoc } from './smartdata.classes.collection.js';
import { SmartDataDbDoc, svDb, unI } from './smartdata.classes.doc.js';
import { SmartdataDbWatcher } from './smartdata.classes.watcher.js';
export let DistributedClass = class DistributedClass extends SmartDataDbDoc {
};
__decorate([
unI(),
__metadata("design:type", String)
], DistributedClass.prototype, "id", void 0);
__decorate([
svDb(),
__metadata("design:type", Object)
], DistributedClass.prototype, "data", void 0);
DistributedClass = __decorate([
managed()
], DistributedClass);
/**
* This file implements a distributed coordinator according to the @pushrocks/taskbuffer standard.
* you should not set up this yourself. Instead, there is a factory on the SmartdataDb class
* that will take care of setting this up.
*/
export class SmartdataDistributedCoordinator extends plugins.taskbuffer.distributedCoordination
.AbstractDistributedCoordinator {
constructor(dbArg) {
super();
this.asyncExecutionStack = new plugins.lik.AsyncExecutionStack();
this.id = plugins.smartunique.uni('distributedInstance');
this.startHeartbeat = async () => {
while (this.ownInstance.data.status !== 'stopped') {
await this.sendHeartbeat();
await plugins.smartdelay.delayForRandom(5000, 10000);
}
};
this.db = dbArg;
setDefaultManagerForDoc(this, DistributedClass);
this.readyPromise = this.db.statusConnectedDeferred.promise;
}
// smartdata specific stuff
async start() {
await this.init();
}
async stop() {
await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
if (this.distributedWatcher) {
await this.distributedWatcher.close();
}
if (this.ownInstance?.data.elected) {
this.ownInstance.data.elected = false;
}
if (this.ownInstance?.data.status === 'stopped') {
console.log(`stopping a distributed instance that has not been started yet.`);
}
this.ownInstance.data.status = 'stopped';
await this.ownInstance.save();
console.log(`stopped ${this.ownInstance.id}`);
});
}
async sendHeartbeat() {
await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
if (this.ownInstance.data.status === 'stopped') {
console.log(`aborted sending heartbeat because status is stopped`);
return;
}
await this.ownInstance.updateFromDb();
this.ownInstance.data.lastUpdated = Date.now();
await this.ownInstance.save();
console.log(`sent heartbeat for ${this.ownInstance.id}`);
const allInstances = DistributedClass.getInstances({});
});
if (this.ownInstance.data.status === 'stopped') {
console.log(`aborted sending heartbeat because status is stopped`);
return;
}
const eligibleLeader = await this.getEligibleLeader();
// not awaiting here because we don't want to block the heartbeat
this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
if (!eligibleLeader && this.ownInstance.data.status === 'settled') {
this.checkAndMaybeLead();
}
});
}
async init() {
await this.readyPromise;
if (!this.ownInstance) {
await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
this.ownInstance = new DistributedClass();
this.ownInstance.id = this.id;
this.ownInstance.data = {
elected: false,
lastUpdated: Date.now(),
status: 'initializing',
taskRequests: [],
taskRequestResults: [],
};
await this.ownInstance.save();
});
}
else {
console.warn(`distributed instance already initialized`);
}
// lets enable the heartbeat
this.startHeartbeat();
// lets do a leader check
await this.checkAndMaybeLead();
return this.ownInstance;
}
async getEligibleLeader() {
return this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
const allInstances = await DistributedClass.getInstances({});
let leaders = allInstances.filter((instanceArg) => instanceArg.data.elected === true);
const eligibleLeader = leaders.find((leader) => leader.data.lastUpdated >=
Date.now() - plugins.smarttime.getMilliSecondsFromUnits({ seconds: 20 }));
return eligibleLeader;
});
}
// --> leader election
async checkAndMaybeLead() {
await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
this.ownInstance.data.status = 'initializing';
this.ownInstance.save();
});
if (await this.getEligibleLeader()) {
await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
await this.ownInstance.updateFromDb();
this.ownInstance.data.status = 'settled';
await this.ownInstance.save();
console.log(`${this.ownInstance.id} settled as follower`);
});
return;
}
else if ((await DistributedClass.getInstances({})).find((instanceArg) => {
instanceArg.data.status === 'bidding' &&
instanceArg.data.biddingStartTime <= Date.now() - 4000 &&
instanceArg.data.biddingStartTime >= Date.now() - 30000;
})) {
console.log('too late to the bidding party... waiting for next round.');
return;
}
else {
await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
await this.ownInstance.updateFromDb();
this.ownInstance.data.status = 'bidding';
this.ownInstance.data.biddingStartTime = Date.now();
this.ownInstance.data.biddingShortcode = plugins.smartunique.shortId();
await this.ownInstance.save();
console.log('bidding code stored.');
});
console.log(`bidding for leadership...`);
await plugins.smartdelay.delayFor(plugins.smarttime.getMilliSecondsFromUnits({ seconds: 5 }));
await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
let biddingInstances = await DistributedClass.getInstances({});
biddingInstances = biddingInstances.filter((instanceArg) => instanceArg.data.status === 'bidding' &&
instanceArg.data.lastUpdated >=
Date.now() - plugins.smarttime.getMilliSecondsFromUnits({ seconds: 10 }));
console.log(`found ${biddingInstances.length} bidding instances...`);
this.ownInstance.data.elected = true;
for (const biddingInstance of biddingInstances) {
if (biddingInstance.data.biddingShortcode < this.ownInstance.data.biddingShortcode) {
this.ownInstance.data.elected = false;
}
}
await plugins.smartdelay.delayFor(5000);
console.log(`settling with status elected = ${this.ownInstance.data.elected}`);
this.ownInstance.data.status = 'settled';
await this.ownInstance.save();
});
if (this.ownInstance.data.elected) {
this.leadFunction();
}
}
}
/**
* when it has been determined
* that this instance is leading
* the leading is implemented here
*/
async leadFunction() {
this.distributedWatcher = await DistributedClass.watch({});
const currentTaskRequests = [];
this.distributedWatcher.changeSubject.subscribe({
next: async (distributedDoc) => {
if (!distributedDoc) {
console.log(`registered deletion of instance...`);
return;
}
console.log(distributedDoc);
console.log(`registered change for ${distributedDoc.id}`);
distributedDoc;
},
});
while (this.ownInstance.data.status !== 'stopped' && this.ownInstance.data.elected) {
const allInstances = await DistributedClass.getInstances({});
for (const instance of allInstances) {
if (instance.data.status === 'stopped') {
await instance.delete();
}
;
}
await plugins.smartdelay.delayFor(10000);
}
}
// abstract implemented methods
async fireDistributedTaskRequest(taskRequestArg) {
await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
if (!this.ownInstance) {
console.error('instance need to be started first...');
return;
}
await this.ownInstance.updateFromDb();
this.ownInstance.data.taskRequests.push(taskRequestArg);
await this.ownInstance.save();
});
await plugins.smartdelay.delayFor(10000);
const result = await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
await this.ownInstance.updateFromDb();
const taskRequestResult = this.ownInstance.data.taskRequestResults.find((resultItem) => {
return resultItem.requestResponseId === taskRequestArg.requestResponseId;
});
return taskRequestResult;
});
if (!result) {
console.warn('no result found for task request...');
return null;
}
return result;
}
async updateDistributedTaskRequest(infoBasisArg) {
await this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
const existingInfoBasis = this.ownInstance.data.taskRequests.find((infoBasisItem) => {
return (infoBasisItem.taskName === infoBasisArg.taskName &&
infoBasisItem.taskExecutionTime === infoBasisArg.taskExecutionTime);
});
if (!existingInfoBasis) {
console.warn('trying to update a non existing task request... aborting!');
return;
}
Object.assign(existingInfoBasis, infoBasisArg);
await this.ownInstance.save();
plugins.smartdelay.delayFor(60000).then(() => {
this.asyncExecutionStack.getExclusiveExecutionSlot(async () => {
const indexToRemove = this.ownInstance.data.taskRequests.indexOf(existingInfoBasis);
this.ownInstance.data.taskRequests.splice(indexToRemove, indexToRemove);
await this.ownInstance.save();
});
});
});
}
}
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