Implemented MoQServer initialization with specified eventbases

Summary: Added updates to MoQServer and HQServer to allow to pass in a std::vector<folly::Eventbase*> param to start a quicserver on it.

Reviewed By: sharmafb

Differential Revision: D78365120

fbshipit-source-id: 52e4e7760b0cf0328508d09c238a093a564a0f73

Author: Sujay Patel

third-party/proxygen/src/proxygen/httpserver/samples/hq/HQServer.cpp

@@ -267,14 +267,20 @@ HQServer::HQServer(HQServerParams params,
   }
 }
 
-void HQServer::start() {
+void HQServer::start(std::vector<folly::EventBase*> evbs) {
   folly::SocketAddress localAddress;
   if (params_.localAddress) {
     localAddress = *params_.localAddress;
   } else {
     localAddress.setFromLocalPort(params_.port);
   }
-  server_->start(localAddress, params_.serverThreads);
+
+  if (evbs.empty()) {
+    server_->start(localAddress, params_.serverThreads);
+  } else {
+    server_->initialize(localAddress, evbs, true);
+    server_->start();
+  }
 }
 
 const folly::SocketAddress HQServer::getAddress() const {

third-party/proxygen/src/proxygen/httpserver/samples/hq/HQServer.h

@@ -37,7 +37,7 @@ class HQServer {
            std::unique_ptr<quic::QuicServerTransportFactory> factory);
 
   // Starts the QUIC transport in background thread
-  void start();
+  void start(std::vector<folly::EventBase*> evbs = {});
 
   // Returns the listening address of the server
   // NOTE: can block until the server has started