Feature / Adopt externally accepted sockets into uWebSockets. (#1697)

* Adopt externally accepted sockets into uWebSockets.

* Integrate uSockets typo.

---------

Co-authored-by: markus <markus.kuehni@triviso.ch>

Author: markmaker

src/App.h

@@ -575,6 +575,12 @@ struct TemplatedApp {
         return std::move(*this);
     }
 
+    /* adopt an externally accepted socket */
+    TemplatedApp &&adoptSocket(LIBUS_SOCKET_DESCRIPTOR accepted_fd) {
+        httpContext->adoptAcceptedSocket(accepted_fd);
+        return std::move(*this);
+    }
+
     TemplatedApp &&run() {
         uWS::run();
         return std::move(*this);

src/HttpContext.h

@@ -482,6 +482,11 @@ struct HttpContext {
     us_listen_socket_t *listen(const char *path, int options) {
         return us_socket_context_listen_unix(SSL, getSocketContext(), path, options, sizeof(HttpResponseData<SSL>));
     }
+
+    /* Adopt an externally accepted socket into this HttpContext */
+    us_socket_t *adoptAcceptedSocket(LIBUS_SOCKET_DESCRIPTOR accepted_fd) {
+        return us_adopt_accepted_socket(SSL, getSocketContext(), accepted_fd, sizeof(HttpResponseData<SSL>), 0, 0);
+    }
 };
 
 }