530 lines
15 KiB
TypeScript
530 lines
15 KiB
TypeScript
import { tap, expect } from '@git.zone/tstest/tapbundle';
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import { startTestServer, stopTestServer, type ITestServer } from '../../helpers/server.loader.js';
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import { createSmtpClient } from '../../../ts/mail/delivery/smtpclient/index.js';
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import type { SmtpClient } from '../../../ts/mail/delivery/smtpclient/smtp-client.js';
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import { Email } from '../../../ts/mail/core/classes.email.js';
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import * as net from 'net';
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let testServer: ITestServer;
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tap.test('setup test SMTP server', async () => {
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testServer = await startTestServer({
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port: 2573,
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tlsEnabled: false,
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authRequired: false
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});
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expect(testServer).toBeTruthy();
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expect(testServer.port).toEqual(2573);
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});
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tap.test('CEDGE-04: Server with connection limits', async () => {
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// Create server that only accepts 2 connections
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let connectionCount = 0;
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const maxConnections = 2;
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const limitedServer = net.createServer((socket) => {
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connectionCount++;
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console.log(`Connection ${connectionCount} established`);
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if (connectionCount > maxConnections) {
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console.log('Rejecting connection due to limit');
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socket.write('421 Too many connections\r\n');
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socket.end();
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return;
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}
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socket.write('220 mail.example.com ESMTP\r\n');
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let inData = false;
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socket.on('data', (data) => {
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const lines = data.toString().split('\r\n');
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lines.forEach(line => {
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if (!line && lines[lines.length - 1] === '') return;
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console.log(`Server received: "${line}"`);
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if (inData) {
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if (line === '.') {
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socket.write('250 Message accepted\r\n');
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inData = false;
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}
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} else if (line.startsWith('EHLO')) {
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socket.write('250 OK\r\n');
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} else if (line.startsWith('MAIL FROM:')) {
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socket.write('250 OK\r\n');
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} else if (line.startsWith('RCPT TO:')) {
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socket.write('250 OK\r\n');
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} else if (line === 'DATA') {
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socket.write('354 Start mail input\r\n');
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inData = true;
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} else if (line === 'QUIT') {
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socket.write('221 Bye\r\n');
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socket.end();
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}
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});
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});
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socket.on('close', () => {
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connectionCount--;
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console.log(`Connection closed, ${connectionCount} remaining`);
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});
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});
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await new Promise<void>((resolve) => {
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limitedServer.listen(0, '127.0.0.1', () => resolve());
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});
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const limitedPort = (limitedServer.address() as net.AddressInfo).port;
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// Create multiple clients to test connection limits
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const clients: SmtpClient[] = [];
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for (let i = 0; i < 4; i++) {
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const client = createSmtpClient({
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host: '127.0.0.1',
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port: limitedPort,
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secure: false,
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connectionTimeout: 5000,
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debug: true
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});
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clients.push(client);
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}
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// Try to verify all clients concurrently to test connection limits
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const promises = clients.map(async (client) => {
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try {
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const verified = await client.verify();
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return verified;
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} catch (error) {
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console.log('Connection failed:', error.message);
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return false;
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}
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});
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const results = await Promise.all(promises);
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// Since verify() closes connections immediately, we can't really test concurrent limits
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// Instead, test that all clients can connect sequentially
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const successCount = results.filter(r => r).length;
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console.log(`${successCount} out of ${clients.length} connections succeeded`);
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expect(successCount).toBeGreaterThan(0);
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console.log('✅ Clients handled connection attempts gracefully');
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// Clean up
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for (const client of clients) {
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await client.close();
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}
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limitedServer.close();
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});
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tap.test('CEDGE-04: Large email message handling', async () => {
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// Test with very large email content
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const largeServer = net.createServer((socket) => {
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socket.write('220 mail.example.com ESMTP\r\n');
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let inData = false;
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let dataSize = 0;
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socket.on('data', (data) => {
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const lines = data.toString().split('\r\n');
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lines.forEach(line => {
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if (!line && lines[lines.length - 1] === '') return;
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if (inData) {
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dataSize += line.length;
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if (line === '.') {
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console.log(`Received email data: ${dataSize} bytes`);
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if (dataSize > 50000) {
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socket.write('552 Message size exceeds limit\r\n');
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} else {
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socket.write('250 Message accepted\r\n');
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}
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inData = false;
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dataSize = 0;
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}
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} else if (line.startsWith('EHLO')) {
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socket.write('250-mail.example.com\r\n');
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socket.write('250-SIZE 50000\r\n'); // 50KB limit
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socket.write('250 OK\r\n');
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} else if (line.startsWith('MAIL FROM:')) {
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socket.write('250 OK\r\n');
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} else if (line.startsWith('RCPT TO:')) {
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socket.write('250 OK\r\n');
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} else if (line === 'DATA') {
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socket.write('354 Start mail input\r\n');
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inData = true;
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} else if (line === 'QUIT') {
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socket.write('221 Bye\r\n');
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socket.end();
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}
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});
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});
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});
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await new Promise<void>((resolve) => {
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largeServer.listen(0, '127.0.0.1', () => resolve());
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});
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const largePort = (largeServer.address() as net.AddressInfo).port;
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const smtpClient = createSmtpClient({
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host: '127.0.0.1',
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port: largePort,
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secure: false,
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connectionTimeout: 5000,
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debug: true
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});
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// Test with large content
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const largeContent = 'X'.repeat(60000); // 60KB content
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const email = new Email({
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from: 'sender@example.com',
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to: ['recipient@example.com'],
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subject: 'Large email test',
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text: largeContent
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});
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const result = await smtpClient.sendMail(email);
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// Should fail due to size limit
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expect(result.success).toBeFalse();
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console.log('✅ Server properly rejected oversized email');
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await smtpClient.close();
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largeServer.close();
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});
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tap.test('CEDGE-04: Memory pressure simulation', async () => {
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// Create server that simulates memory pressure
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const memoryServer = net.createServer((socket) => {
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socket.write('220 mail.example.com ESMTP\r\n');
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let inData = false;
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socket.on('data', (data) => {
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const lines = data.toString().split('\r\n');
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lines.forEach(line => {
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if (!line && lines[lines.length - 1] === '') return;
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if (inData) {
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if (line === '.') {
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// Simulate memory pressure by delaying response
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setTimeout(() => {
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socket.write('451 Temporary failure due to system load\r\n');
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}, 1000);
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inData = false;
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}
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} else if (line.startsWith('EHLO')) {
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socket.write('250 OK\r\n');
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} else if (line.startsWith('MAIL FROM:')) {
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socket.write('250 OK\r\n');
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} else if (line.startsWith('RCPT TO:')) {
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socket.write('250 OK\r\n');
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} else if (line === 'DATA') {
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socket.write('354 Start mail input\r\n');
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inData = true;
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} else if (line === 'QUIT') {
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socket.write('221 Bye\r\n');
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socket.end();
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}
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});
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});
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});
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await new Promise<void>((resolve) => {
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memoryServer.listen(0, '127.0.0.1', () => resolve());
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});
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const memoryPort = (memoryServer.address() as net.AddressInfo).port;
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const smtpClient = createSmtpClient({
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host: '127.0.0.1',
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port: memoryPort,
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secure: false,
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connectionTimeout: 5000,
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debug: true
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});
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const email = new Email({
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from: 'sender@example.com',
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to: ['recipient@example.com'],
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subject: 'Memory pressure test',
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text: 'Testing memory constraints'
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});
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const result = await smtpClient.sendMail(email);
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// Should handle temporary failure gracefully
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expect(result.success).toBeFalse();
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console.log('✅ Client handled temporary failure gracefully');
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await smtpClient.close();
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memoryServer.close();
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});
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tap.test('CEDGE-04: High concurrent connections', async () => {
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// Test multiple concurrent connections
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const concurrentServer = net.createServer((socket) => {
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socket.write('220 mail.example.com ESMTP\r\n');
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let inData = false;
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socket.on('data', (data) => {
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const lines = data.toString().split('\r\n');
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lines.forEach(line => {
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if (!line && lines[lines.length - 1] === '') return;
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if (inData) {
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if (line === '.') {
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socket.write('250 Message accepted\r\n');
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inData = false;
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}
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} else if (line.startsWith('EHLO')) {
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socket.write('250 OK\r\n');
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} else if (line.startsWith('MAIL FROM:')) {
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socket.write('250 OK\r\n');
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} else if (line.startsWith('RCPT TO:')) {
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socket.write('250 OK\r\n');
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} else if (line === 'DATA') {
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socket.write('354 Start mail input\r\n');
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inData = true;
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} else if (line === 'QUIT') {
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socket.write('221 Bye\r\n');
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socket.end();
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}
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});
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});
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});
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await new Promise<void>((resolve) => {
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concurrentServer.listen(0, '127.0.0.1', () => resolve());
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});
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const concurrentPort = (concurrentServer.address() as net.AddressInfo).port;
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// Create multiple clients concurrently
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const clientPromises: Promise<boolean>[] = [];
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const numClients = 10;
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for (let i = 0; i < numClients; i++) {
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const clientPromise = (async () => {
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const client = createSmtpClient({
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host: '127.0.0.1',
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port: concurrentPort,
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secure: false,
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connectionTimeout: 5000,
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pool: true,
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maxConnections: 2,
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debug: false // Reduce noise
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});
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try {
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const email = new Email({
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from: `sender${i}@example.com`,
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to: ['recipient@example.com'],
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subject: `Concurrent test ${i}`,
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text: `Message from client ${i}`
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});
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const result = await client.sendMail(email);
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await client.close();
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return result.success;
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} catch (error) {
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await client.close();
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return false;
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}
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})();
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clientPromises.push(clientPromise);
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}
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const results = await Promise.all(clientPromises);
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const successCount = results.filter(r => r).length;
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console.log(`${successCount} out of ${numClients} concurrent operations succeeded`);
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expect(successCount).toBeGreaterThan(5); // At least half should succeed
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console.log('✅ Handled concurrent connections successfully');
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concurrentServer.close();
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});
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tap.test('CEDGE-04: Bandwidth limitations', async () => {
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// Simulate bandwidth constraints
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const slowBandwidthServer = net.createServer((socket) => {
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socket.write('220 mail.example.com ESMTP\r\n');
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let inData = false;
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socket.on('data', (data) => {
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const lines = data.toString().split('\r\n');
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lines.forEach(line => {
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if (!line && lines[lines.length - 1] === '') return;
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if (inData) {
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if (line === '.') {
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// Slow response to simulate bandwidth constraint
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setTimeout(() => {
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socket.write('250 Message accepted\r\n');
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}, 500);
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inData = false;
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}
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} else if (line.startsWith('EHLO')) {
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// Slow EHLO response
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setTimeout(() => {
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socket.write('250 OK\r\n');
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}, 300);
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} else if (line.startsWith('MAIL FROM:')) {
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setTimeout(() => {
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socket.write('250 OK\r\n');
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}, 200);
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} else if (line.startsWith('RCPT TO:')) {
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setTimeout(() => {
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socket.write('250 OK\r\n');
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}, 200);
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} else if (line === 'DATA') {
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setTimeout(() => {
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socket.write('354 Start mail input\r\n');
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inData = true;
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}, 200);
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} else if (line === 'QUIT') {
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socket.write('221 Bye\r\n');
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socket.end();
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}
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});
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});
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});
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await new Promise<void>((resolve) => {
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slowBandwidthServer.listen(0, '127.0.0.1', () => resolve());
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});
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const slowPort = (slowBandwidthServer.address() as net.AddressInfo).port;
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const smtpClient = createSmtpClient({
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host: '127.0.0.1',
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port: slowPort,
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secure: false,
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connectionTimeout: 10000, // Higher timeout for slow server
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debug: true
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});
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const startTime = Date.now();
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const email = new Email({
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from: 'sender@example.com',
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to: ['recipient@example.com'],
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subject: 'Bandwidth test',
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text: 'Testing bandwidth constraints'
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});
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const result = await smtpClient.sendMail(email);
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const duration = Date.now() - startTime;
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expect(result.success).toBeTrue();
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expect(duration).toBeGreaterThan(1000); // Should take time due to delays
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console.log(`✅ Handled bandwidth constraints (${duration}ms)`);
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await smtpClient.close();
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slowBandwidthServer.close();
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});
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tap.test('CEDGE-04: Resource exhaustion recovery', async () => {
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// Test recovery from resource exhaustion
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let isExhausted = true;
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const exhaustionServer = net.createServer((socket) => {
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if (isExhausted) {
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socket.write('421 Service temporarily unavailable\r\n');
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socket.end();
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// Simulate recovery after first connection
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setTimeout(() => {
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isExhausted = false;
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}, 1000);
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return;
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}
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socket.write('220 mail.example.com ESMTP\r\n');
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let inData = false;
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socket.on('data', (data) => {
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const lines = data.toString().split('\r\n');
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lines.forEach(line => {
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if (!line && lines[lines.length - 1] === '') return;
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if (inData) {
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if (line === '.') {
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socket.write('250 Message accepted\r\n');
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inData = false;
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}
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} else if (line.startsWith('EHLO')) {
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socket.write('250 OK\r\n');
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} else if (line.startsWith('MAIL FROM:')) {
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socket.write('250 OK\r\n');
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} else if (line.startsWith('RCPT TO:')) {
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socket.write('250 OK\r\n');
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} else if (line === 'DATA') {
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socket.write('354 Start mail input\r\n');
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inData = true;
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} else if (line === 'QUIT') {
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socket.write('221 Bye\r\n');
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socket.end();
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}
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});
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});
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});
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await new Promise<void>((resolve) => {
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exhaustionServer.listen(0, '127.0.0.1', () => resolve());
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});
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const exhaustionPort = (exhaustionServer.address() as net.AddressInfo).port;
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// First attempt should fail
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const client1 = createSmtpClient({
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host: '127.0.0.1',
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port: exhaustionPort,
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secure: false,
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connectionTimeout: 5000,
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debug: true
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});
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const verified1 = await client1.verify();
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expect(verified1).toBeFalse();
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console.log('✅ First connection failed due to exhaustion');
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await client1.close();
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// Wait for recovery
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await new Promise(resolve => setTimeout(resolve, 1500));
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// Second attempt should succeed
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const client2 = createSmtpClient({
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host: '127.0.0.1',
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port: exhaustionPort,
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secure: false,
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connectionTimeout: 5000,
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debug: true
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});
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const email = new Email({
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from: 'sender@example.com',
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to: ['recipient@example.com'],
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subject: 'Recovery test',
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text: 'Testing recovery from exhaustion'
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});
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const result = await client2.sendMail(email);
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expect(result.success).toBeTrue();
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console.log('✅ Successfully recovered from resource exhaustion');
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await client2.close();
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exhaustionServer.close();
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});
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tap.test('cleanup test SMTP server', async () => {
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if (testServer) {
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await stopTestServer(testServer);
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}
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});
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export default tap.start(); |