dcrouter/test/suite/smtpclient_performance/test.cperf-05.network-efficiency.ts

import { tap, expect } from '@git.zone/tstest/tapbundle';
import { startTestServer, stopTestServer, type ITestServer } from '../../helpers/server.loader.js';
import { createSmtpClient, createPooledSmtpClient } from '../../../ts/mail/delivery/smtpclient/index.js';
import { Email } from '../../../ts/mail/core/classes.email.js';

tap.test('setup - start SMTP server for network efficiency tests', async () => {
  // Just a placeholder to ensure server starts properly
});

tap.test('CPERF-05: network efficiency - connection reuse', async () => {
  const testServer = await startTestServer({
    secure: false,
    authOptional: true,
  });

  console.log('Testing connection reuse efficiency...');
  
  // Test 1: Individual connections (2 messages)
  console.log('Sending 2 messages with individual connections...');
  const individualStart = Date.now();
  
  for (let i = 0; i < 2; i++) {
    const client = createSmtpClient({
      host: 'localhost',
      port: 2525,
      secure: false,
      authOptional: true,
    });

    const email = new Email({
      from: 'sender@example.com',
      to: [`recipient${i}@example.com`],
      subject: `Test ${i}`,
      text: `Message ${i}`,
    });

    const result = await client.sendMail(email);
    expect(result.success).toBeTrue();
    await client.close();
  }
  
  const individualTime = Date.now() - individualStart;
  console.log(`Individual connections: 2 connections, ${individualTime}ms`);

  // Test 2: Connection reuse (2 messages)
  console.log('Sending 2 messages with connection reuse...');
  const reuseStart = Date.now();
  
  const reuseClient = createSmtpClient({
    host: 'localhost',
    port: 2525,
    secure: false,
    authOptional: true,
  });

  for (let i = 0; i < 2; i++) {
    const email = new Email({
      from: 'sender@example.com',
      to: [`reuse${i}@example.com`],
      subject: `Reuse ${i}`,
      text: `Message ${i}`,
    });

    const result = await reuseClient.sendMail(email);
    expect(result.success).toBeTrue();
  }
  
  await reuseClient.close();
  
  const reuseTime = Date.now() - reuseStart;
  console.log(`Connection reuse: 1 connection, ${reuseTime}ms`);
  
  // Connection reuse should complete reasonably quickly
  expect(reuseTime).toBeLessThan(5000); // Less than 5 seconds

  await stopTestServer(testServer);
});

tap.test('CPERF-05: network efficiency - message throughput', async () => {
  const testServer = await startTestServer({
    secure: false,
    authOptional: true,
  });

  console.log('Testing message throughput...');
  
  const client = createSmtpClient({
    host: 'localhost',
    port: 2525,
    secure: false,
    authOptional: true,
  });

  // Test with different message sizes
  const sizes = [1024, 10240]; // 1KB, 10KB
  let totalBytes = 0;
  const startTime = Date.now();

  for (const size of sizes) {
    const content = 'x'.repeat(size);
    const email = new Email({
      from: 'sender@example.com',
      to: ['recipient@example.com'],
      subject: `Test ${size} bytes`,
      text: content,
    });

    const result = await client.sendMail(email);
    expect(result.success).toBeTrue();
    totalBytes += size;
  }
  
  const elapsed = Date.now() - startTime;
  const throughput = (totalBytes / elapsed) * 1000; // bytes per second
  
  console.log(`Total bytes sent: ${totalBytes}`);
  console.log(`Time elapsed: ${elapsed}ms`);
  console.log(`Throughput: ${(throughput / 1024).toFixed(1)} KB/s`);
  
  // Should achieve reasonable throughput
  expect(throughput).toBeGreaterThan(512); // At least 512 bytes/s
  
  await client.close();
  await stopTestServer(testServer);
});

tap.test('CPERF-05: network efficiency - concurrent connections', async () => {
  const testServer = await startTestServer({
    secure: false,
    authOptional: true,
  });

  console.log('Testing concurrent connections...');

  // Create pooled client
  const poolClient = createPooledSmtpClient({
    host: 'localhost',
    port: 2525,
    secure: false,
    authOptional: true,
    maxConnections: 2,
  });

  // Send 4 emails concurrently
  const emails = Array(4).fill(null).map((_, i) => 
    new Email({
      from: 'sender@example.com',
      to: [`concurrent${i}@example.com`],
      subject: `Concurrent ${i}`,
      text: `Testing concurrent connections - message ${i}`,
    })
  );

  console.log('Sending 4 emails through connection pool...');
  const poolStart = Date.now();
  
  // Send emails concurrently
  const results = await Promise.all(
    emails.map(email => poolClient.sendMail(email))
  );
  
  results.forEach(result => expect(result.success).toBeTrue());
  
  const poolTime = Date.now() - poolStart;
  
  console.log(`Emails sent: 4`);
  console.log(`Total time: ${poolTime}ms`);
  console.log(`Average time per email: ${(poolTime / 4).toFixed(1)}ms`);
  
  // Pool should handle multiple emails efficiently
  expect(poolTime).toBeLessThan(10000); // Less than 10 seconds total
  
  await poolClient.close();
  await stopTestServer(testServer);
});

tap.test('cleanup - stop SMTP server', async () => {
  // Cleanup is handled in individual tests
});

tap.start();