ADDED: A new IPC API based on protobuf and nng

Details, documentation, and language bindings are works in
progress and will be evolving over the course of KiCad 9
development.

common/api/api_handler.cpp

@@ -0,0 +1,74 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2023 Jon Evans <[email protected]>
+ * Copyright (C) 2023 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <api/api_handler.h>
+
+using kiapi::common::ApiRequest, kiapi::common::ApiResponse, kiapi::common::ApiResponseStatus;
+
+
+API_RESULT API_HANDLER::Handle( ApiRequest& aMsg )
+{
+    ApiResponseStatus status;
+
+    if( !aMsg.has_message() )
+    {
+        status.set_status( ApiStatusCode::AS_BAD_REQUEST );
+        status.set_error_message( "request has no inner message" );
+        return tl::unexpected( status );
+    }
+
+    std::string typeName;
+
+    if( !google::protobuf::Any::ParseAnyTypeUrl( aMsg.message().type_url(), &typeName ) )
+    {
+        status.set_status( ApiStatusCode::AS_BAD_REQUEST );
+        status.set_error_message( "could not parse inner message type" );
+        return tl::unexpected( status );
+    }
+
+    auto it = m_handlers.find( typeName );
+
+    if( it != m_handlers.end() )
+    {
+        REQUEST_HANDLER& handler = it->second;
+        return handler( aMsg );
+    }
+
+    status.set_status( ApiStatusCode::AS_UNHANDLED );
+    // This response is used internally; no need for an error message
+    return tl::unexpected( status );
+}
+
+
+std::optional<KICAD_T> API_HANDLER::TypeNameFromAny( const google::protobuf::Any& aMessage )
+{
+    static const std::map<std::string, KICAD_T> s_types = {
+        { "type.googleapis.com/kiapi.board.types.Track", PCB_TRACE_T },
+        { "type.googleapis.com/kiapi.board.types.Arc", PCB_ARC_T },
+        { "type.googleapis.com/kiapi.board.types.Via", PCB_VIA_T },
+    };
+
+    auto it = s_types.find( aMessage.type_url() );
+
+    if( it != s_types.end() )
+        return it->second;
+
+    return std::nullopt;
+}