fix:(sks): Add queue between kafka and lambda

lib/lambda/delayedEmailProcessor.ts

@@ -0,0 +1,300 @@
+import { SQSEvent } from "aws-lambda";
+import { SESClient, SendEmailCommand, SendEmailCommandInput } from "@aws-sdk/client-ses";
+import { EmailAddresses, KafkaRecord, Events } from "shared-types";
+import { decodeBase64WithUtf8, getSecret } from "shared-utils";
+import { getEmailTemplates, getAllStateUsers } from "libs/email";
+import * as os from "libs/opensearch-lib";
+import { EMAIL_CONFIG, getCpocEmail, getSrtEmails } from "libs/email/content/email-components";
+import { htmlToText, HtmlToTextOptions } from "html-to-text";
+import pLimit from "p-limit";
+import { getOsNamespace } from "libs/utils";
+
+interface ProcessEmailConfig {
+  emailAddressLookupSecretName: string;
+  applicationEndpointUrl: string;
+  osDomain: string;
+  indexNamespace?: string;
+  region: string;
+  DLQ_URL: string;
+  userPoolId: string;
+  configurationSetName: string;
+  isDev: boolean;
+}
+
+/**
+ * Main SQS handler: parse each SQS message to get the original Kafka payload,
+ * then do OpenSearch lookups and send emails.
+ */
+export const handler = async (event: SQSEvent) => {
+  const requiredEnvVars = [
+    "emailAddressLookupSecretName",
+    "applicationEndpointUrl",
+    "osDomain",
+    "region",
+    "DLQ_URL",
+    "userPoolId",
+    "isDev",
+    "configurationSetName",
+  ] as const;
+
+  const missing = requiredEnvVars.filter((e) => !process.env[e]);
+  if (missing.length > 0) {
+    throw new Error(`Missing environment variables: ${missing.join(", ")}`);
+  }
+
+  const emailConfig: ProcessEmailConfig = {
+    emailAddressLookupSecretName: process.env.emailAddressLookupSecretName!,
+    applicationEndpointUrl: process.env.applicationEndpointUrl!,
+    osDomain: `https://${process.env.osDomain!}`,
+    indexNamespace: process.env.indexNamespace,
+    region: process.env.region!,
+    DLQ_URL: process.env.DLQ_URL!,
+    userPoolId: process.env.userPoolId!,
+    configurationSetName: process.env.configurationSetName!,
+    isDev: process.env.isDev === "true",
+  };
+
+  for (const sqsRecord of event.Records) {
+    try {
+      const kafkaRecord = JSON.parse(sqsRecord.body) as KafkaRecord;
+
+      const { key, value } = kafkaRecord; // sanity check
+      if (!key || !value) {
+        console.log("No key/value present. Possibly a tombstone or invalid data.");
+        continue;
+      }
+
+      await processRecord(kafkaRecord, emailConfig);
+    } catch (error) {
+      console.error("Error processing SQS record:", error);
+      throw error; // Let Lambda handle retries / DLQ
+    }
+  }
+};
+
+/**
+ * Takes a KafkaRecord, decodes data, and triggers the actual
+ * "processAndSendEmails" function.
+ */
+async function processRecord(kafkaRecord: KafkaRecord, config: ProcessEmailConfig) {
+  console.log("Processing record from SQS => KafkaRecord:", JSON.stringify(kafkaRecord, null, 2));
+
+  const { key, value, timestamp } = kafkaRecord;
+  const id: string = decodeBase64WithUtf8(key); // decode the key
+
+  if (!value) {
+    console.log("Tombstone detected, nothing to do.");
+    return;
+  }
+
+  const recordBody = JSON.parse(decodeBase64WithUtf8(value));
+
+  // Example check: only process if origin is "mako"
+  if (recordBody.origin !== "mako") {
+    console.log("Kafka event is not of 'mako' origin. Skipping.");
+    return;
+  }
+
+  // Combine the original fields for passing to the next step
+  const eventObj = {
+    ...recordBody,
+    timestamp,
+  };
+
+  try {
+    await processAndSendEmails(eventObj as Events[keyof Events], id, config);
+  } catch (error) {
+    console.error("Error in processAndSendEmails:", error);
+    throw error;
+  }
+}
+
+/**
+ * Main email processing function:
+ * 1. Retrieves the relevant email templates
+ * 2. Loads user data & secrets
+ * 3. Queries OpenSearch for the item
+ * 4. Renders & sends emails with concurrency limiting
+ */
+export async function processAndSendEmails(
+  record: Events[keyof Events],
+  id: string,
+  config: ProcessEmailConfig,
+) {
+  const templates = await getEmailTemplates(record);
+  if (!templates) {
+    console.log(`No email templates for event '${record.event}'. Skipping.`);
+    return;
+  }
+
+  const territory = id.slice(0, 2);
+  const allStateUsers = await getAllStateUsers({
+    userPoolId: config.userPoolId,
+    state: territory,
+  });
+
+  const secretString = await getSecret(config.emailAddressLookupSecretName);
+  const emails: EmailAddresses = JSON.parse(secretString);
+
+  // Retrieve package from OpenSearch
+  const item = await os.getItem(config.osDomain, getOsNamespace("main"), id);
+  if (!item?.found || !item?._source) {
+    console.log(`OpenSearch item not found for id: ${id}. Skipping.`);
+    return;
+  }
+
+  const cpocEmail = getCpocEmail(item);
+  const srtEmails = getSrtEmails(item);
+
+  // Gather variables to pass into templates
+  const templateVariables = {
+    ...record,
+    id,
+    territory,
+    applicationEndpointUrl: config.applicationEndpointUrl,
+    emails: {
+      ...emails,
+      cpocEmail,
+      srtEmails,
+    },
+    allStateUsersEmails: allStateUsers.map((user) => user.formattedEmailAddress),
+  };
+
+  console.log("Template variables:", JSON.stringify(templateVariables, null, 2));
+
+  // Concurrency limit for sending
+  const limit = pLimit(5);
+
+  const sendTasks = templates.map((tmpl) =>
+    limit(async () => {
+      const filledTemplate = await tmpl(templateVariables);
+      validateEmailTemplate(filledTemplate);
+      const params = createEmailParams(
+        filledTemplate,
+        emails.sourceEmail,
+        config.applicationEndpointUrl,
+        config.isDev,
+        config.configurationSetName,
+      );
+      return sendEmail(params, config.region);
+    }),
+  );
+
+  try {
+    await Promise.all(sendTasks);
+    console.log("All emails sent successfully for id:", id);
+  } catch (err) {
+    console.error("Email sending failed:", err);
+    throw err;
+  }
+}
+
+/**
+ * Ensure the template has the necessary fields before sending.
+ */
+export function validateEmailTemplate(tmpl: {
+  to: string[];
+  subject: string;
+  body: string;
+  cc?: string[];
+}) {
+  const requiredFields: (keyof typeof tmpl)[] = ["to", "subject", "body"];
+  const missing = requiredFields.filter((f) => !tmpl[f]);
+  if (missing.length > 0) {
+    throw new Error(`Email template missing fields: ${missing.join(", ")}`);
+  }
+}
+
+/**
+ * Create the SES params. Optionally add BCC in dev.
+ */
+export function createEmailParams(
+  filledTemplate: {
+    to: string[];
+    subject: string;
+    body: string;
+    cc?: string[];
+  },
+  sourceEmail: string,
+  baseUrl: string,
+  isDev: boolean,
+  configurationSetName?: string,
+): SendEmailCommandInput {
+  return {
+    Destination: {
+      ToAddresses: filledTemplate.to,
+      CcAddresses: filledTemplate.cc || [],
+      BccAddresses: isDev ? [`Dev BCC <${EMAIL_CONFIG.DEV_EMAIL}>`] : [],
+    },
+    Message: {
+      Body: {
+        Html: {
+          Data: filledTemplate.body,
+          Charset: "UTF-8",
+        },
+        Text: {
+          Data: htmlToText(filledTemplate.body, htmlToTextOptions(baseUrl)),
+          Charset: "UTF-8",
+        },
+      },
+      Subject: {
+        Data: filledTemplate.subject,
+        Charset: "UTF-8",
+      },
+    },
+    Source: sourceEmail,
+    ConfigurationSetName: configurationSetName,
+  };
+}
+
+/**
+ * Send the email via AWS SES.
+ */
+export async function sendEmail(params: SendEmailCommandInput, region: string) {
+  const sesClient = new SESClient({ region });
+  const command = new SendEmailCommand(params);
+  const result = await sesClient.send(command);
+  console.log("SES send result:", result);
+  return result;
+}
+
+/**
+ * Options for converting HTML to text
+ */
+export function htmlToTextOptions(baseUrl: string): HtmlToTextOptions {
+  return {
+    wordwrap: 80,
+    preserveNewlines: true,
+    selectors: [
+      {
+        selector: "h1",
+        options: { uppercase: true, leadingLineBreaks: 2, trailingLineBreaks: 1 },
+      },
+      {
+        selector: "img",
+        options: { ignoreHref: true, src: true },
+      },
+      {
+        selector: "p",
+        options: { leadingLineBreaks: 1, trailingLineBreaks: 1 },
+      },
+      {
+        selector: "a",
+        options: {
+          linkBrackets: ["[", "]"],
+          baseUrl,
+          hideLinkHrefIfSameAsText: true,
+        },
+      },
+    ],
+    limits: {
+      maxInputLength: 50000,
+      ellipsis: "...",
+      maxBaseElements: 1000,
+    },
+    longWordSplit: {
+      forceWrapOnLimit: false,
+      wrapCharacters: ["-", "/"],
+    },
+  };
+}