n8n/dist/scaling/pubsub/subscriber.service.js

n8n Workflow Automation Tool

"use strict";
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;
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    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 __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Subscriber = void 0;
const debounce_1 = __importDefault(require("lodash/debounce"));
const n8n_core_1 = require("n8n-core");
const n8n_workflow_1 = require("n8n-workflow");
const typedi_1 = require("typedi");
const config_1 = __importDefault(require("../../config"));
const event_service_1 = require("../../events/event.service");
const logger_service_1 = require("../../logging/logger.service");
const redis_client_service_1 = require("../../services/redis-client.service");
let Subscriber = class Subscriber {
    constructor(logger, redisClientService, eventService, instanceSettings) {
        this.logger = logger;
        this.redisClientService = redisClientService;
        this.eventService = eventService;
        this.instanceSettings = instanceSettings;
        if (config_1.default.getEnv('executions.mode') !== 'queue')
            return;
        this.logger = this.logger.scoped(['scaling', 'pubsub']);
        this.client = this.redisClientService.createClient({ type: 'subscriber(n8n)' });
        const handlerFn = (msg) => {
            const eventName = 'command' in msg ? msg.command : msg.response;
            this.eventService.emit(eventName, msg.payload);
        };
        const debouncedHandlerFn = (0, debounce_1.default)(handlerFn, 300);
        this.client.on('message', (channel, str) => {
            const msg = this.parseMessage(str, channel);
            if (!msg)
                return;
            if (msg.debounce)
                debouncedHandlerFn(msg);
            else
                handlerFn(msg);
        });
    }
    getClient() {
        return this.client;
    }
    shutdown() {
        this.client.disconnect();
    }
    async subscribe(channel) {
        await this.client.subscribe(channel, (error) => {
            if (error) {
                this.logger.error(`Failed to subscribe to channel ${channel}`, { error });
                return;
            }
            this.logger.debug(`Subscribed to channel ${channel}`);
        });
    }
    parseMessage(str, channel) {
        const msg = (0, n8n_workflow_1.jsonParse)(str, {
            fallbackValue: null,
        });
        if (!msg) {
            this.logger.error(`Received malformed message via channel ${channel}`, {
                msg: str,
                channel,
            });
            return null;
        }
        const { hostId } = this.instanceSettings;
        if ('command' in msg &&
            !msg.selfSend &&
            (msg.senderId === hostId || (msg.targets && !msg.targets.includes(hostId)))) {
            return null;
        }
        const msgName = 'command' in msg ? msg.command : msg.response;
        this.logger.debug(`Received message ${msgName} via channel ${channel}`, {
            msg,
            channel,
        });
        return msg;
    }
};
exports.Subscriber = Subscriber;
exports.Subscriber = Subscriber = __decorate([
    (0, typedi_1.Service)(),
    __metadata("design:paramtypes", [logger_service_1.Logger,
        redis_client_service_1.RedisClientService,
        event_service_1.EventService,
        n8n_core_1.InstanceSettings])
], Subscriber);
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