ovsdb-idl: log error in client when db schema does not exist on server

A common error scenario with OVN is to attempt to use ovn-nbctl when
the OVN databases have not been created in ovsdb-server:
   1. ovn-nbctl sends "get_schema" request for OVN db to ovsdb-server.
   2. ovsdb-server fails to find requested db, sends error response
      to ovn-nbctl.
   3. ovn-nbctl receives the error response in ovsdb_idl_run(), but
      takes no specific action.
   4. ovn-nbctl hangs forever in IDL_S_SCHEMA_REQUESTED state (assuming
      a timeout wasn't requested on the command line).

Add a log message to inform the user of this situation.

Signed-off-by: Lance Richardson <lrichard@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

diff --git a/lib/ovsdb-idl.c b/lib/ovsdb-idl.c
index 7e84138..4cb1c81 100644 (file)
--- a/lib/ovsdb-idl.c
+++ b/lib/ovsdb-idl.c
@@ -453,6 +453,14 @@ ovsdb_idl_run(struct ovsdb_idl *idl)
                 ovsdb_idl_send_monitor_request(idl);
                 idl->state = IDL_S_MONITOR_REQUESTED;
             }
+        } else if (msg->type == JSONRPC_ERROR
+                   && idl->state == IDL_S_SCHEMA_REQUESTED
+                   && idl->request_id
+                   && json_equal(idl->request_id, msg->id)) {
+                json_destroy(idl->request_id);
+                idl->request_id = NULL;
+                VLOG_ERR("%s: requested schema not found",
+                         jsonrpc_session_get_name(idl->session));
         } else if ((msg->type == JSONRPC_ERROR
                     || msg->type == JSONRPC_REPLY)
                    && ovsdb_idl_txn_process_reply(idl, msg)) {