[evolution-data-server] [GTasks] Remember when timed query resulted in '400 Bad Request'

[Milan Crha <mcrha src gnome org>]

commit fb15aca9e2ad16e1fa58d799191fffdf03fe1e7c
Author: Milan Crha <mcrha redhat com>
Date:   Wed Oct 11 19:02:55 2017 +0200

    [GTasks] Remember when timed query resulted in '400 Bad Request'
    
    This way every synchronization with the server content is not done twice,
    once with time constraint and another time without it, because the first
    failed.

 .../backends/gtasks/e-cal-backend-gtasks.c         |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/calendar/backends/gtasks/e-cal-backend-gtasks.c 
b/src/calendar/backends/gtasks/e-cal-backend-gtasks.c
index b700d63..f8c4d2c 100644
--- a/src/calendar/backends/gtasks/e-cal-backend-gtasks.c
+++ b/src/calendar/backends/gtasks/e-cal-backend-gtasks.c
@@ -42,6 +42,7 @@ struct _ECalBackendGTasksPrivate {
        GDataTasksService *service;
        GDataTasksTasklist *tasklist;
        GHashTable *preloaded; /* gchar *uid ~> ECalComponent * */
+       gboolean bad_request_for_timed_query;
 };
 
 G_DEFINE_TYPE (ECalBackendGTasks, e_cal_backend_gtasks, E_TYPE_CAL_META_BACKEND)
@@ -580,7 +581,7 @@ ecb_gtasks_get_changes_sync (ECalMetaBackend *meta_backend,
        cal_cache = e_cal_meta_backend_ref_cache (meta_backend);
 
        if (!ecb_gtasks_check_data_version (cal_cache) ||
-           !last_sync_tag ||
+           !last_sync_tag || cbgtasks->priv->bad_request_for_timed_query ||
            !g_time_val_from_iso8601 (last_sync_tag, &last_updated)) {
                last_updated.tv_sec = 0;
        }
@@ -603,6 +604,10 @@ ecb_gtasks_get_changes_sync (ECalMetaBackend *meta_backend,
            g_error_matches (local_error, GDATA_SERVICE_ERROR, GDATA_SERVICE_ERROR_PROTOCOL_ERROR))) {
                g_clear_error (&local_error);
 
+               /* To not repeat with broken time format ad infinity;
+                  it changes only with updated libgdata, or change on the server. */
+               cbgtasks->priv->bad_request_for_timed_query = TRUE;
+
                gdata_query_set_updated_min (GDATA_QUERY (tasks_query), -1);
 
                feed = gdata_tasks_service_query_tasks (cbgtasks->priv->service, cbgtasks->priv->tasklist,
@@ -960,6 +965,7 @@ e_cal_backend_gtasks_init (ECalBackendGTasks *cbgtasks)
 {
        cbgtasks->priv = G_TYPE_INSTANCE_GET_PRIVATE (cbgtasks, E_TYPE_CAL_BACKEND_GTASKS, 
ECalBackendGTasksPrivate);
        cbgtasks->priv->preloaded = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
+       cbgtasks->priv->bad_request_for_timed_query = FALSE;
 }
 
 static void