@logistically/events-nestjs
Version:
NestJS integration for @logistically/events v3 - Event-driven architecture with Redis Streams
103 lines (102 loc) • 4.76 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);
};
var AutoEventHandlerService_1;
Object.defineProperty(exports, "__esModule", { value: true });
exports.AutoEventHandlerService = void 0;
const common_1 = require("@nestjs/common");
const event_system_service_1 = require("./event-system.service");
const auto_event_handler_decorator_1 = require("../decorators/auto-event-handler.decorator");
let AutoEventHandlerService = AutoEventHandlerService_1 = class AutoEventHandlerService {
constructor(eventSystemService) {
this.eventSystemService = eventSystemService;
this.logger = new common_1.Logger(AutoEventHandlerService_1.name);
this.consumer = null;
AutoEventHandlerService_1.instance = this;
}
static getInstance() {
return AutoEventHandlerService_1.instance;
}
async onModuleInit() {
await this.initializeConsumer();
}
async initializeConsumer() {
try {
// Wait for the event system to be ready
let attempts = 0;
const maxAttempts = 10;
while (attempts < maxAttempts) {
try {
const eventSystem = this.eventSystemService.getEventSystem();
this.consumer = eventSystem.consumer;
this.logger.log('Auto event handler service initialized successfully');
return;
}
catch (error) {
attempts++;
if (attempts >= maxAttempts) {
throw error;
}
// Wait 100ms before retrying
await new Promise(resolve => setTimeout(resolve, 100));
}
}
}
catch (error) {
this.logger.error('Failed to initialize auto event handler service', error);
}
}
/**
* Register event handlers from a service instance using AutoEventHandler decorators
*/
async registerEventHandlers(instance) {
if (!this.consumer) {
this.logger.warn('Consumer not initialized, skipping handler registration');
return;
}
const prototype = Object.getPrototypeOf(instance);
const methodNames = Object.getOwnPropertyNames(prototype).filter(name => name !== 'constructor' && typeof prototype[name] === 'function');
let registeredCount = 0;
for (const methodName of methodNames) {
const metadata = (0, auto_event_handler_decorator_1.getAutoEventHandlerMetadata)(instance, methodName);
if (metadata) {
await this.registerHandler(instance, methodName, metadata);
registeredCount++;
}
}
if (registeredCount > 0) {
this.logger.log(`Registered ${registeredCount} auto event handlers from ${instance.constructor.name}`);
}
}
async registerHandler(instance, methodName, metadata) {
const eventType = metadata.eventType;
const handler = instance[methodName].bind(instance);
try {
await this.consumer.subscribe(eventType, async (event) => {
try {
await handler(event.body);
}
catch (error) {
this.logger.error(`Error handling event ${eventType} in ${instance.constructor.name}.${methodName}:`, error);
}
});
this.logger.log(`Registered auto event handler: ${instance.constructor.name}.${methodName} for ${eventType}`);
}
catch (error) {
this.logger.error(`Failed to register auto handler for ${eventType}:`, error);
}
}
};
exports.AutoEventHandlerService = AutoEventHandlerService;
AutoEventHandlerService.instance = null;
exports.AutoEventHandlerService = AutoEventHandlerService = AutoEventHandlerService_1 = __decorate([
(0, common_1.Injectable)(),
__metadata("design:paramtypes", [event_system_service_1.EventSystemService])
], AutoEventHandlerService);