fix: json thread safe

include/modules/sway/ipc/client.hpp

@@ -44,6 +44,7 @@ class Ipc {
   int              fd_event_;
   std::mutex       mutex_;
   std::mutex       mutex_event_;
+  std::mutex       mutex_parser_;
   util::JsonParser parser_;
 };
 

src/modules/sway/ipc/client.cpp

@@ -104,6 +104,7 @@ struct Ipc::ipc_response Ipc::recv(int fd) {
     }
     total += res;
   }
+  std::lock_guard<std::mutex> lock(mutex_parser_);
   auto parsed = parser_.parse(&payload.front());
   return {data32[0], data32[1], parsed};
 }