session client UPDATE allow manual context fill

... for new sessions.

Author: michalvasko

src/session_client.c

@@ -321,6 +321,12 @@ nc_client_get_schema_callback(void **user_data)
     return client_opts.schema_clb;
 }
 
+API void
+nc_client_set_new_session_context_autofill(int enabled)
+{
+    client_opts.auto_context_fill_disabled = !enabled;
+}
+
 struct module_info {
     char *name;
     char *revision;
@@ -1240,6 +1246,11 @@ nc_ctx_check_and_fill(struct nc_session *session)
 
     assert(session->opts.client.cpblts && session->ctx);
 
+    if (client_opts.auto_context_fill_disabled) {
+        VRB(session, "Context of the new session is left only with the default YANG modules.");
+        return 0;
+    }
+
     /* store the original user's callback, we will be switching between local search, get-schema and user callback */
     old_clb = ly_ctx_get_module_imp_clb(session->ctx, &old_data);
 

src/session_client.h

@@ -83,6 +83,16 @@ int nc_client_set_schema_callback(ly_module_imp_clb clb, void *user_data);
  */
 ly_module_imp_clb nc_client_get_schema_callback(void **user_data);
 
+/**
+ * @brief Enable/disable loading of all the YANG modules supported by
+ * the server when a new session is created. If disabled, it is expected
+ * that users update the context themselves and load the YANG modules
+ * that are planned to be used. Otherwise even basic RPCs may fail to be sent!
+ *
+ * @param[in] enabled Whether context autofill is enabled or disabled.
+ */
+void nc_client_set_new_session_context_autofill(int enabled);
+
 /**
  * @brief Use the provided thread-specific client's context in the current thread.
  *

src/session_p.h

@@ -145,6 +145,7 @@ struct nc_server_unix_opts {
 /* ACCESS unlocked */
 struct nc_client_opts {
     char *schema_searchpath;
+    int auto_context_fill_disabled;
     ly_module_imp_clb schema_clb;
     void *schema_clb_data;
     struct nc_keepalives ka;