mailserver: a056bcfd broke mail server restart

after proxying, we never restarted the mail server

also add note that restart has to reconfigure

src/routes/mailserver.js

@@ -2,7 +2,7 @@
 
 exports = module.exports = {
     proxy,
-    restart,
+    proxyAndRestart,
     queueProxy,
 
     setLocation,
@@ -21,12 +21,6 @@ const assert = require('assert'),
     services = require('../services.js'),
     url = require('url');
 
-// because of how the proxy middleware works, the http response is already sent by the time this function is called
-async function restart(req, res, next) {
-    await safe(mailServer.restart(), { debug });
-    next();
-}
-
 async function proxyToMailContainer(port, pathname, req, res, next) {
     const parsedUrl = url.parse(req.url, true /* parseQueryString */);
 
@@ -46,7 +40,7 @@ async function proxyToMailContainer(port, pathname, req, res, next) {
 
     req.clearTimeout(); // TODO: add timeout to mail server proxy logic instead of this
     mailserverProxy(req, res, function (error) {
-        if (!error) return; // response was already sent by proxy, do not proceed to connect-lastmile
+        if (!error) return next(); // note: response was already sent by proxy by this point
 
         if (error.code === 'ECONNREFUSED') return next(new HttpError(424, 'Unable to connect to mail server'));
         if (error.code === 'ECONNRESET') return next(new HttpError(424, 'Unable to query mail server'));
@@ -58,7 +52,22 @@ async function proxyToMailContainer(port, pathname, req, res, next) {
 async function proxy(req, res, next) {
     const pathname = req.path.split('/').pop();
 
-    proxyToMailContainer(3000, pathname, req, res, next);
+    proxyToMailContainer(3000, pathname, req, res, function (httpError) {
+        if (httpError) return next(httpError);
+
+        // for success, the proxy already sent the response. do not proceed to connect-lastmile which will result in double headers
+    });
+}
+
+async function proxyAndRestart(req, res, next) {
+    const pathname = req.path.split('/').pop();
+
+    proxyToMailContainer(3000, pathname, req, res, async function (httpError) {
+        if (httpError) return next(httpError);
+
+        // for success, the proxy already sent the response. do not proceed to connect-lastmile which will result in double headers
+        await safe(mailServer.restart(), { debug });
+    });
 }
 
 async function queueProxy(req, res, next) {