Move dummy authority.z fetch out of update_router_descriptor_downloads

To make sure that a server learns if its IP has changed, the server
sometimes launches authority.z descriptor fetches from
update_router_descriptor_downloads.  That's nice, but we're moving
towards a situation where update_router_descriptor_downloads doesn't
always get called.  So this patch breaks the authority.z
check-and-fetch into a new function.

This function also renames last_routerdesc_download to a more
appropriate last_descriptor_download, and adds a new
update_all_descriptor_downloads() function.

(For now, this is unnecessary, since servers don't actually use
microdescriptors.  But that could change, or bridges could start
using microdescriptors, and then we'll be glad this is refactored
nicely.)

1 files changed, 1 insertions, 0 deletions

diff --git a/src/or/routerlist.h b/src/or/routerlist.h
index 940e206365..a613c34b88 100644
--- a/src/or/routerlist.h
+++ b/src/or/routerlist.h
@@ -144,6 +144,7 @@ int any_trusted_dir_is_v1_authority(void);
 void update_consensus_router_descriptor_downloads(time_t now, int is_vote,
                                                   networkstatus_t *consensus);
 void update_router_descriptor_downloads(time_t now);
+void update_all_descriptor_downloads(time_t now);
 void update_extrainfo_downloads(time_t now);
 int router_have_minimum_dir_info(void);
 void router_dir_info_changed(void);