node_modules: update (#344)

Co-authored-by: dawidd6 <9713907+dawidd6@users.noreply.github.com>

node_modules/nodemailer/dist/esm/smtp-pool/pool-resource.js

@@ -52,6 +52,8 @@ export default class PoolResource extends EventEmitter {
         this.messages = 0;
         this.available = true;
         this._failed = false;
+        this._sending = false;
+        this._idleTimer = false;
     }
     /**
      * Emits 'error' for the first failure only. A dead resource can report the same failure more
@@ -71,7 +73,9 @@ export default class PoolResource extends EventEmitter {
      * @param callback Callback function to run once the connection is established or failed
      */
     connect(callback) {
-        this.pool.getSocket(this.options, (err, socketOptions) => {
+        // the proxy handshake, if any, counts against connectionTimeout as well
+        const connectStartedAt = Date.now();
+        this.pool.getSocket(Object.assign({}, this.options, { connectStartedAt }), (err, socketOptions) => {
             if (err) {
                 // nothing was connected, so no 'close' event is coming that would free the
                 // slot this resource holds in the pool, report the failure the way a failed
@@ -93,7 +97,21 @@ export default class PoolResource extends EventEmitter {
                 options = Object.assign(assign(false, options), socketOptions);
             }
             this.connection = new SMTPConnection(options);
-            this.connection.on('error', err => {
+            this.connection._connectStartedAt = connectStartedAt;
+            this.connection.on('error', (err) => {
+                if (this._sending) {
+                    // the send callback gets the same error and decides what it means for the message
+                    return;
+                }
+                if (this._connected && errors.isTransientError(err)) {
+                    // the server ended a connection that had nothing in flight, usually after it
+                    // was idle for a while. The 'end' that follows closes this resource
+                    this.logger.info({
+                        tnx: 'pool',
+                        cid: this.id
+                    }, 'Connection #%s was closed by the server: %s', this.id, err.message);
+                    return;
+                }
                 this._fail(err);
                 if (returned) {
                     return;
@@ -171,9 +189,39 @@ export default class PoolResource extends EventEmitter {
         if (mail.data.requireTLSExtensionEnabled) {
             envelope.requireTLSExtensionEnabled = mail.data.requireTLSExtensionEnabled;
         }
-        this.connection.send(envelope, mail.message.createReadStream(), (err, info) => {
+        this._sending = true;
+        // a connection that sent messages before may have been dropped by the server in between
+        const reused = this.messages > 0;
+        const messageStream = mail.message.createReadStream();
+        this.connection.send(envelope, messageStream, (err, info) => {
+            this._sending = false;
             this.messages++;
             if (err) {
+                if (reused && messageStream.readableDidRead === false && errors.isTransientError(err)) {
+                    // Not a byte of the message was sent, so it can go out over another
+                    // connection. The pool requeues the message when this resource closes
+                    this.logger.info({
+                        tnx: 'pool',
+                        cid: this.id,
+                        messageId
+                    }, 'Connection #%s was closed by the server before message %s was sent: %s', this.id, messageId, err.message);
+                    this.connection.close();
+                    return;
+                }
+                if ((err.code === errors.EENVELOPE || err.code === errors.EMESSAGE) &&
+                    err.responseCode !== 421 &&
+                    !this.connection._destroyed) {
+                    // The server refused this message, the connection itself is fine. Reset the
+                    // session and keep using it instead of opening a new one
+                    this.connection.reset(resetErr => {
+                        if (resetErr) {
+                            this.connection.close();
+                            return;
+                        }
+                        this._release();
+                    });
+                    return callback(err);
+                }
                 this.connection.close();
                 this._fail(err);
                 return callback(err);
@@ -183,28 +231,69 @@ export default class PoolResource extends EventEmitter {
                 to: envelope.to
             };
             info.messageId = messageId;
-            setImmediate(() => {
-                if (this.messages >= this.options.maxMessages) {
-                    const err = new Error('Resource exhausted');
-                    err.code = errors.EMAXLIMIT;
-                    this.connection.close();
-                    this._fail(err);
-                }
-                else {
-                    this.pool._checkRateLimit(() => {
-                        this.available = true;
-                        this.emit('available');
-                    });
-                }
-            });
+            setImmediate(() => this._release());
             callback(null, info);
         });
     }
+    /**
+     * Makes the connection available for the next message, or closes it once it has sent
+     * maxMessages messages
+     *
+     * @internal
+     */
+    _release() {
+        if (this.messages >= this.options.maxMessages) {
+            const err = new Error('Resource exhausted');
+            err.code = errors.EMAXLIMIT;
+            this.connection.close();
+            this._fail(err);
+            return;
+        }
+        this.pool._checkRateLimit(() => {
+            this.available = true;
+            this._startIdleTimer();
+            this.emit('available');
+        });
+    }
+    /** @internal */
+    _startIdleTimer() {
+        if (!this.options.idleTimeout || this.options.idleTimeout < 0) {
+            return;
+        }
+        // one timer per connection, restarted every time the connection becomes available. A
+        // connection that is busy when it fires is simply not closed
+        if (this._idleTimer && typeof this._idleTimer.refresh === 'function') {
+            this._idleTimer.refresh();
+            return;
+        }
+        clearTimeout(this._idleTimer);
+        this._idleTimer = setTimeout(() => {
+            if (!this.available) {
+                return;
+            }
+            this.logger.debug({
+                tnx: 'pool',
+                cid: this.id
+            }, 'Closing connection #%s after it was idle for %sms', this.id, this.options.idleTimeout);
+            // not handed another message while it says goodbye
+            this.available = false;
+            this.connection.quit();
+        }, this.options.idleTimeout);
+        if (typeof this._idleTimer.unref === 'function') {
+            this._idleTimer.unref();
+        }
+    }
+    /** @internal */
+    _stopIdleTimer() {
+        clearTimeout(this._idleTimer);
+        this._idleTimer = false;
+    }
     /**
      * Closes the connection
      */
     close() {
         this._connected = false;
+        this._stopIdleTimer();
         if (this.auth && this.auth.oauth2) {
             this.auth.oauth2.removeAllListeners();
         }