chore: add script for email stress test

apps/mail-bridge/env.ts

@@ -68,6 +68,14 @@ export const env = createEnv({
         fwd: z.array(z.string())
       })
     ),
+    MAILBRIDGE_TRANSACTIONAL_CREDENTIALS: stringToJSON.pipe(
+      z.object({
+        apiUrl: z.string().url(),
+        apiKey: z.string().min(1),
+        sendAsName: z.string().min(1),
+        sendAsEmail: z.string().email()
+      })
+    ),
     MAILBRIDGE_POSTAL_SERVERS_DNS_ROOT_URL: z.string().min(1),
     MAILBRIDGE_LOCAL_MODE: z
       .string()

apps/mail-bridge/package.json

@@ -8,7 +8,8 @@
     "start": "node --import ./.output/tracing.js .output/app.js",
     "build": "tsup",
     "check": "tsc --noEmit",
-    "mock:incoming-mail": "tsx ./scripts/mock-incoming.ts"
+    "mock:incoming-mail": "tsx ./scripts/mock-incoming.ts",
+    "stress:email": "tsx ./scripts/email-stress-test.ts"
   },
   "exports": {
     "./trpc": {

apps/mail-bridge/scripts/email-stress-test.ts

@@ -0,0 +1,253 @@
+import {
+  cancel,
+  group,
+  intro,
+  outro,
+  select,
+  text,
+  log,
+  spinner
+} from '@clack/prompts';
+import { nanoIdToken } from '@u22n/utils/zodSchemas';
+import { env } from '../env';
+import { z } from 'zod';
+
+const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
+
+type EmailData = {
+  to: string[];
+  cc: string[];
+  from: string;
+  sender: string;
+  subject: string;
+  plain_body: string;
+  html_body: string;
+  attachments: unknown[];
+  headers: Record<string, string>;
+};
+
+type PostalResponse =
+  | {
+      status: 'success';
+      time: number;
+      flags: unknown;
+      data: {
+        message_id: string;
+        messages: Record<
+          string,
+          {
+            id: number;
+            token: string;
+          }
+        >;
+      };
+    }
+  | {
+      status: 'parameter-error';
+      time: number;
+      flags: unknown;
+      data: {
+        message: string;
+      };
+    };
+
+async function sendEmail(emailData: EmailData): Promise<PostalResponse> {
+  const config = env.MAILBRIDGE_TRANSACTIONAL_CREDENTIALS;
+  const sendMailPostalResponse = (await fetch(
+    `${config.apiUrl}/api/v1/send/message`,
+    {
+      method: 'POST',
+      headers: {
+        'X-Server-API-Key': `${config.apiKey}`,
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify(emailData)
+    }
+  )
+    .then((res) => res.json())
+    .catch((e: Error) => {
+      log.error(`🚨 error sending email ${e.message}`);
+      return {
+        status: 'parameter-error',
+        time: Date.now(),
+        flags: {},
+        data: { message_id: 'console', messages: {} }
+      };
+    })) as PostalResponse;
+
+  return sendMailPostalResponse;
+}
+
+const { start, stop } = spinner();
+
+const sendIndividualEmails = async (
+  email: string,
+  amount: number,
+  interval: number,
+  testIdentifier: string
+) => {
+  for (let i = 0; i < amount; i++) {
+    const uniqueId = Date.now() + i;
+    const subject = `Test Email ${i + 1} (ID: ${uniqueId}, testId: ${testIdentifier})`;
+    const content = `This is a test email (${i + 1} of ${amount}).`;
+
+    const emailData = {
+      to: [email],
+      cc: [],
+      from: `${env.MAILBRIDGE_TRANSACTIONAL_CREDENTIALS.sendAsName} <${env.MAILBRIDGE_TRANSACTIONAL_CREDENTIALS.sendAsEmail}>`,
+      sender: env.MAILBRIDGE_TRANSACTIONAL_CREDENTIALS.sendAsEmail,
+      subject,
+      plain_body: content,
+      html_body: `<p>${content}</p>`,
+      attachments: [],
+      headers: {}
+    };
+
+    try {
+      const response = await sendEmail(emailData);
+
+      if (response.status === 'success') {
+        log.info(
+          `Email ${i + 1} sent successfully: ${JSON.stringify(response.data)}`
+        );
+      } else {
+        log.error(
+          `Error sending email ${i + 1}: ${JSON.stringify(response.data)}`
+        );
+      }
+    } catch (error) {
+      log.error(
+        `Unexpected error sending email ${i + 1}: ${error instanceof Error ? error.message : 'Unknown error'}`
+      );
+    }
+
+    if (i < amount - 1) {
+      start(`Waiting ${interval} seconds before sending next email...`);
+      await sleep(interval * 1000);
+      stop(`Sending Email ${i + 1} of ${amount}`);
+    }
+  }
+};
+
+const sendReplyChain = async (
+  email: string,
+  amount: number,
+  interval: number,
+  testIdentifier: string
+) => {
+  let previousMessageId: string | undefined;
+
+  for (let i = 0; i < amount; i++) {
+    const subject =
+      i === 0
+        ? `Initial Email (Hash: ${testIdentifier})`
+        : `Re: Initial Email (Hash: ${testIdentifier})`;
+    const content = `This is ${i === 0 ? 'the initial email' : `a reply (${i} of ${amount - 1})`}.`;
+
+    const emailData: EmailData = {
+      to: [email],
+      cc: [],
+      from: `${env.MAILBRIDGE_TRANSACTIONAL_CREDENTIALS.sendAsName} <${env.MAILBRIDGE_TRANSACTIONAL_CREDENTIALS.sendAsEmail}>`,
+      sender: env.MAILBRIDGE_TRANSACTIONAL_CREDENTIALS.sendAsEmail,
+      subject,
+      plain_body: content,
+      html_body: `<p>${content}</p>`,
+      attachments: [],
+      headers: previousMessageId ? { 'In-Reply-To': previousMessageId } : {}
+    };
+
+    try {
+      const response = await sendEmail(emailData);
+
+      if (response.status === 'success') {
+        log.info(
+          `Email ${i + 1} sent successfully: ${JSON.stringify(response.data)}`
+        );
+        previousMessageId = response.data.message_id;
+      } else {
+        log.error(
+          `Error sending email ${i + 1}: ${JSON.stringify(response.data)}`
+        );
+      }
+    } catch (error) {
+      log.error(
+        `Unexpected error sending email ${i + 1}: ${error instanceof Error ? error.message : 'Unknown error'}`
+      );
+    }
+
+    if (i < amount - 1) {
+      start(`Waiting ${interval} seconds before sending next email...`);
+      await sleep(interval * 1000);
+      stop(`Sending Email ${i + 1} of ${amount}`);
+    }
+  }
+};
+
+intro('Stress Test Email');
+
+const params = await group(
+  {
+    email: () =>
+      text({
+        message: 'Enter the email address to send to',
+        validate: (value) => {
+          if (!z.string().email().safeParse(value).success) {
+            return 'Email is not valid';
+          }
+        }
+      }),
+    amount: () =>
+      text({
+        message: 'Enter the amount of emails to send',
+        validate: (value) => {
+          if (!z.coerce.number().int().min(1).safeParse(value).success) {
+            return 'Amount must be a positive integer';
+          }
+          if (Number(value) > 50) {
+            return 'Amount must be less than 50';
+          }
+        },
+        initialValue: '10'
+      }),
+    interval: () =>
+      text({
+        message: 'Enter the interval between emails in seconds',
+        validate: (value) => {
+          if (!z.coerce.number().int().min(1).safeParse(value).success) {
+            return 'Interval must be a positive integer';
+          }
+          if (Number(value) > 60) {
+            return 'Interval must be less than 60';
+          }
+        },
+        initialValue: '1'
+      }),
+    mode: () =>
+      select({
+        message: 'Select the mode',
+        options: [
+          { value: 'individual', label: 'Individual' },
+          { value: 'reply-chain', label: 'Reply Chain' }
+        ],
+        initialValue: 'individual'
+      })
+  },
+  {
+    onCancel: () => {
+      cancel('Cancelled');
+      process.exit(0);
+    }
+  }
+);
+
+const sendFunction =
+  params.mode === 'individual' ? sendIndividualEmails : sendReplyChain;
+
+await sendFunction(
+  params.email,
+  Number(params.amount),
+  Number(params.interval),
+  nanoIdToken(6)
+);
+
+outro('Emails sent');

package.json

@@ -44,7 +44,8 @@
     "db:drop": "dotenv -e .env.local -- turbo run db:drop",
     "start:all:r": "infisical run --env=remote -- turbo run start",
     "dev:r": "infisical run --env=remote -- turbo run dev",
-    "dev:spaces": "infisical run --env=spacesremote -- turbo run dev",
+    "stress:email": "dotenv -e .env.local -- pnpm --dir apps/mail-bridge stress:email",
+    "stress:email:r": "infisical run --env=remote -- pnpm --dir apps/mail-bridge stress:email",
     "db:push:r": "infisical run --env=remote -- pnpm --dir packages/database db:push",
     "db:studio:r": "infisical run --env=remote -- turbo run db:studio",
     "db:generate:r": "infisical run --env=remote -- turbo run db:generate",