From 01c3f5108493130c61d98b08a72274ec905e8e0d Mon Sep 17 00:00:00 2001
From: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Date: Fri, 20 Nov 2020 15:28:04 -0800
Subject: [PATCH] feat: allow Middleware to be added at any time

`Arc` has thing kind-of-magic method called `make_mut` which can do an interior clone if there are immutable references.

This uses that to allow middleware to be registered on a server while it is already listening, without interfering with existing requests.
---
 src/server.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/server.rs b/src/server.rs
index 853d39e34..36b25ff24 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -179,8 +179,7 @@ impl<State: Clone + Send + Sync + 'static> Server<State> {
         M: Middleware<State>,
     {
         log::trace!("Adding middleware {}", middleware.name());
-        let m = Arc::get_mut(&mut self.middleware)
-            .expect("Registering middleware is not possible after the Server has started");
+        let m = Arc::make_mut(&mut self.middleware);
         m.push(Arc::new(middleware));
         self
     }