mirror of
https://github.com/n8n-io/n8n.git
synced 2024-09-21 07:17:38 -07:00
318 lines
9.5 KiB
TypeScript
318 lines
9.5 KiB
TypeScript
import * as localtunnel from 'localtunnel';
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import {
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TUNNEL_SUBDOMAIN_ENV,
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UserSettings,
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} from 'n8n-core';
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import { Command, flags } from '@oclif/command';
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const open = require('open');
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import * as Redis from 'ioredis';
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import * as config from '../config';
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import {
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ActiveExecutions,
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ActiveWorkflowRunner,
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CredentialsOverwrites,
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CredentialTypes,
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DatabaseType,
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Db,
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ExternalHooks,
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GenericHelpers,
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IExecutionsCurrentSummary,
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LoadNodesAndCredentials,
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NodeTypes,
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Server,
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TestWebhooks,
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} from '../src';
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import { IDataObject } from 'n8n-workflow';
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let activeWorkflowRunner: ActiveWorkflowRunner.ActiveWorkflowRunner | undefined;
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let processExistCode = 0;
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export class Start extends Command {
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static description = 'Starts n8n. Makes Web-UI available and starts active workflows';
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static examples = [
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`$ n8n start`,
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`$ n8n start --tunnel`,
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`$ n8n start -o`,
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`$ n8n start --tunnel -o`,
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];
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static flags = {
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help: flags.help({ char: 'h' }),
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open: flags.boolean({
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char: 'o',
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description: 'opens the UI automatically in browser',
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}),
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tunnel: flags.boolean({
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description: 'runs the webhooks via a hooks.n8n.cloud tunnel server. Use only for testing and development!',
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}),
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};
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/**
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* Opens the UI in browser
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*/
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static openBrowser() {
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const editorUrl = GenericHelpers.getBaseUrl();
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open(editorUrl, { wait: true })
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.catch((error: Error) => {
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console.log(`\nWas not able to open URL in browser. Please open manually by visiting:\n${editorUrl}\n`);
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});
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}
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/**
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* Stoppes the n8n in a graceful way.
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* Make for example sure that all the webhooks from third party services
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* get removed.
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*/
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static async stopProcess() {
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console.log(`\nStopping n8n...`);
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try {
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const externalHooks = ExternalHooks();
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await externalHooks.run('n8n.stop', []);
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setTimeout(() => {
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// In case that something goes wrong with shutdown we
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// kill after max. 30 seconds no matter what
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process.exit(processExistCode);
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}, 30000);
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const skipWebhookDeregistration = config.get('endpoints.skipWebhoooksDeregistrationOnShutdown') as boolean;
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const removePromises = [];
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if (activeWorkflowRunner !== undefined && skipWebhookDeregistration !== true) {
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removePromises.push(activeWorkflowRunner.removeAll());
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}
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// Remove all test webhooks
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const testWebhooks = TestWebhooks.getInstance();
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removePromises.push(testWebhooks.removeAll());
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await Promise.all(removePromises);
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// Wait for active workflow executions to finish
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const activeExecutionsInstance = ActiveExecutions.getInstance();
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let executingWorkflows = activeExecutionsInstance.getActiveExecutions() as IExecutionsCurrentSummary[];
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let count = 0;
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while (executingWorkflows.length !== 0) {
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if (count++ % 4 === 0) {
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console.log(`Waiting for ${executingWorkflows.length} active executions to finish...`);
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executingWorkflows.map(execution => {
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console.log(` - Execution ID ${execution.id}, workflow ID: ${execution.workflowId}`);
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});
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}
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await new Promise((resolve) => {
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setTimeout(resolve, 500);
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});
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executingWorkflows = activeExecutionsInstance.getActiveExecutions();
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}
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} catch (error) {
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console.error('There was an error shutting down n8n.', error);
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}
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process.exit(processExistCode);
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}
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async run() {
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// Make sure that n8n shuts down gracefully if possible
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process.on('SIGTERM', Start.stopProcess);
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process.on('SIGINT', Start.stopProcess);
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const { flags } = this.parse(Start);
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// Wrap that the process does not close but we can still use async
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await (async () => {
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try {
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// Start directly with the init of the database to improve startup time
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const startDbInitPromise = Db.init().catch((error: Error) => {
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console.error(`There was an error initializing DB: ${error.message}`);
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processExistCode = 1;
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// @ts-ignore
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process.emit('SIGINT');
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});
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// Make sure the settings exist
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const userSettings = await UserSettings.prepareUserSettings();
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// Load all node and credential types
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const loadNodesAndCredentials = LoadNodesAndCredentials();
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await loadNodesAndCredentials.init();
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// Load the credentials overwrites if any exist
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const credentialsOverwrites = CredentialsOverwrites();
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await credentialsOverwrites.init();
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// Load all external hooks
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const externalHooks = ExternalHooks();
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await externalHooks.init();
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// Add the found types to an instance other parts of the application can use
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const nodeTypes = NodeTypes();
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await nodeTypes.init(loadNodesAndCredentials.nodeTypes);
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const credentialTypes = CredentialTypes();
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await credentialTypes.init(loadNodesAndCredentials.credentialTypes);
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// Wait till the database is ready
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await startDbInitPromise;
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if (config.get('executions.mode') === 'queue') {
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const redisHost = config.get('queue.bull.redis.host');
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const redisPassword = config.get('queue.bull.redis.password');
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const redisPort = config.get('queue.bull.redis.port');
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const redisDB = config.get('queue.bull.redis.db');
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const redisConnectionTimeoutLimit = config.get('queue.bull.redis.timeoutThreshold');
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let lastTimer = 0, cumulativeTimeout = 0;
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const settings = {
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retryStrategy: (times: number): number | null => {
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const now = Date.now();
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if (now - lastTimer > 30000) {
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// Means we had no timeout at all or last timeout was temporary and we recovered
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lastTimer = now;
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cumulativeTimeout = 0;
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} else {
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cumulativeTimeout += now - lastTimer;
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lastTimer = now;
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if (cumulativeTimeout > redisConnectionTimeoutLimit) {
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console.error('Unable to connect to Redis after ' + redisConnectionTimeoutLimit + '. Exiting process.');
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process.exit(1);
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}
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}
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return 500;
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},
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} as IDataObject;
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if (redisHost) {
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settings.host = redisHost;
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}
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if (redisPassword) {
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settings.password = redisPassword;
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}
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if (redisPort) {
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settings.port = redisPort;
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}
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if (redisDB) {
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settings.db = redisDB;
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}
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// This connection is going to be our heartbeat
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// IORedis automatically pings redis and tries to reconnect
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// We will be using the retryStrategy above
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// to control how and when to exit.
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const redis = new Redis(settings);
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redis.on('error', (error) => {
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if (error.toString().includes('ECONNREFUSED') === true) {
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console.warn('Redis unavailable - trying to reconnect...');
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} else {
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console.warn('Error with Redis: ', error);
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}
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});
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}
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const dbType = await GenericHelpers.getConfigValue('database.type') as DatabaseType;
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if (dbType === 'sqlite') {
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const shouldRunVacuum = config.get('database.sqlite.executeVacuumOnStartup') as number;
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if (shouldRunVacuum) {
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Db.collections.Execution!.query('VACUUM;');
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}
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}
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if (flags.tunnel === true) {
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this.log('\nWaiting for tunnel ...');
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let tunnelSubdomain;
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if (process.env[TUNNEL_SUBDOMAIN_ENV] !== undefined && process.env[TUNNEL_SUBDOMAIN_ENV] !== '') {
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tunnelSubdomain = process.env[TUNNEL_SUBDOMAIN_ENV];
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} else if (userSettings.tunnelSubdomain !== undefined) {
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tunnelSubdomain = userSettings.tunnelSubdomain;
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}
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if (tunnelSubdomain === undefined) {
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// When no tunnel subdomain did exist yet create a new random one
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const availableCharacters = 'abcdefghijklmnopqrstuvwxyz0123456789';
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userSettings.tunnelSubdomain = Array.from({ length: 24 }).map(() => {
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return availableCharacters.charAt(Math.floor(Math.random() * availableCharacters.length));
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}).join('');
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await UserSettings.writeUserSettings(userSettings);
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}
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const tunnelSettings: localtunnel.TunnelConfig = {
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host: 'https://hooks.n8n.cloud',
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subdomain: tunnelSubdomain,
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};
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const port = config.get('port') as number;
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// @ts-ignore
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const webhookTunnel = await localtunnel(port, tunnelSettings);
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process.env.WEBHOOK_URL = webhookTunnel.url + '/';
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this.log(`Tunnel URL: ${process.env.WEBHOOK_URL}\n`);
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this.log('IMPORTANT! Do not share with anybody as it would give people access to your n8n instance!');
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}
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await Server.start();
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// Start to get active workflows and run their triggers
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activeWorkflowRunner = ActiveWorkflowRunner.getInstance();
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await activeWorkflowRunner.init();
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const editorUrl = GenericHelpers.getBaseUrl();
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this.log(`\nEditor is now accessible via:\n${editorUrl}`);
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// Allow to open n8n editor by pressing "o"
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if (Boolean(process.stdout.isTTY) && process.stdin.setRawMode) {
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process.stdin.setRawMode(true);
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process.stdin.resume();
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process.stdin.setEncoding('utf8');
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let inputText = '';
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if (flags.open === true) {
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Start.openBrowser();
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}
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this.log(`\nPress "o" to open in Browser.`);
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process.stdin.on('data', (key: string) => {
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if (key === 'o') {
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Start.openBrowser();
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inputText = '';
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} else if (key.charCodeAt(0) === 3) {
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// Ctrl + c got pressed
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Start.stopProcess();
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} else {
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// When anything else got pressed, record it and send it on enter into the child process
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if (key.charCodeAt(0) === 13) {
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// send to child process and print in terminal
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process.stdout.write('\n');
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inputText = '';
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} else {
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// record it and write into terminal
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inputText += key;
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process.stdout.write(key);
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}
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}
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});
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}
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} catch (error) {
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this.error(`There was an error: ${error.message}`);
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processExistCode = 1;
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// @ts-ignore
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process.emit('SIGINT');
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}
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})();
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}
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}
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