new node.js impl., removed old stuff

2026-02-12 17:03:00 -06:00
parent 4343aefb76
commit 16469de068
33 changed files with 2762 additions and 2731 deletions
--- a/email-worker-nodejs/delivery.ts
+++ b/email-worker-nodejs/delivery.ts
@@ -0,0 +1,154 @@
+/**
+ * SMTP / email delivery with nodemailer pooled transport
+ *
+ * Replaces both Python's SMTPPool and EmailDelivery classes.
+ * nodemailer handles connection pooling, keepalive, and reconnection natively.
+ *
+ * Removed: LMTP delivery path (never used in production).
+ */
+
+import { createTransport, type Transporter } from 'nodemailer';
+import { config } from '../config.js';
+import { log } from '../logger.js';
+
+// ---------------------------------------------------------------------------
+// Permanent error detection
+// ---------------------------------------------------------------------------
+const PERMANENT_INDICATORS = [
+  '550', '551', '553',
+  'mailbox not found', 'user unknown', 'no such user',
+  'recipient rejected', 'does not exist', 'invalid recipient',
+  'unknown user',
+];
+
+function isPermanentRecipientError(errorMsg: string): boolean {
+  const lower = errorMsg.toLowerCase();
+  return PERMANENT_INDICATORS.some((ind) => lower.includes(ind));
+}
+
+// ---------------------------------------------------------------------------
+// Delivery class
+// ---------------------------------------------------------------------------
+export class EmailDelivery {
+  private transport: Transporter;
+
+  constructor() {
+    this.transport = createTransport({
+      host: config.smtpHost,
+      port: config.smtpPort,
+      secure: config.smtpUseTls,
+      pool: true,
+      maxConnections: config.smtpPoolSize,
+      maxMessages: Infinity, // reuse connections indefinitely
+      tls: { rejectUnauthorized: false },
+      ...(config.smtpUser && config.smtpPass
+        ? { auth: { user: config.smtpUser, pass: config.smtpPass } }
+        : {}),
+    });
+
+    log(
+      `📡 SMTP pool initialized → ${config.smtpHost}:${config.smtpPort} ` +
+        `(max ${config.smtpPoolSize} connections)`,
+    );
+  }
+
+  /**
+   * Send raw email to ONE recipient via the local DMS.
+   *
+   * Returns: [success, errorMessage?, isPermanent]
+   */
+  async sendToRecipient(
+    fromAddr: string,
+    recipient: string,
+    rawMessage: Buffer,
+    workerName: string,
+    maxRetries = 2,
+  ): Promise<[boolean, string | null, boolean]> {
+    let lastError: string | null = null;
+
+    for (let attempt = 0; attempt <= maxRetries; attempt++) {
+      try {
+        await this.transport.sendMail({
+          envelope: { from: fromAddr, to: [recipient] },
+          raw: rawMessage,
+        });
+
+        log(`  ✓ ${recipient}: Delivered (SMTP)`, 'SUCCESS', workerName);
+        return [true, null, false];
+      } catch (err: any) {
+        const errorMsg = err.message ?? String(err);
+        const responseCode = err.responseCode ?? 0;
+
+        // Check for permanent errors (5xx)
+        if (
+          responseCode >= 550 ||
+          isPermanentRecipientError(errorMsg)
+        ) {
+          log(
+            `  ✗ ${recipient}: ${errorMsg} (permanent)`,
+            'ERROR',
+            workerName,
+          );
+          return [false, errorMsg, true];
+        }
+
+        // Connection-level errors → retry
+        if (
+          err.code === 'ECONNRESET' ||
+          err.code === 'ECONNREFUSED' ||
+          err.code === 'ETIMEDOUT' ||
+          errorMsg.toLowerCase().includes('disconnect') ||
+          errorMsg.toLowerCase().includes('closed') ||
+          errorMsg.toLowerCase().includes('connection')
+        ) {
+          log(
+            `  ⚠ ${recipient}: Connection error, retrying... ` +
+              `(attempt ${attempt + 1}/${maxRetries + 1})`,
+            'WARNING',
+            workerName,
+          );
+          lastError = errorMsg;
+          await sleep(300);
+          continue;
+        }
+
+        // Other SMTP errors
+        const isPerm = isPermanentRecipientError(errorMsg);
+        log(
+          `  ✗ ${recipient}: ${errorMsg} (${isPerm ? 'permanent' : 'temporary'})`,
+          'ERROR',
+          workerName,
+        );
+        return [false, errorMsg, isPerm];
+      }
+    }
+
+    // All retries exhausted
+    log(
+      `  ✗ ${recipient}: All retries failed - ${lastError}`,
+      'ERROR',
+      workerName,
+    );
+    return [false, lastError ?? 'Connection failed after retries', false];
+  }
+
+  /** Verify the transport is reachable (used during startup). */
+  async verify(): Promise<boolean> {
+    try {
+      await this.transport.verify();
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
+  /** Close all pooled connections. */
+  close(): void {
+    this.transport.close();
+  }
+}
+
+// ---------------------------------------------------------------------------
+function sleep(ms: number): Promise<void> {
+  return new Promise((r) => setTimeout(r, ms));
+}