control: Add GETINFO support for dumping microdesc consensus

- Allows control port to read microdesc consensus using:
GETINFO dir/status-vote/microdesc/consensus

add: Helper function `getinfo_helper_current_consensus`
test: check if GETINFO commands return expected consensus data.

Resolves 31684.

2 files changed, 7 insertions, 4 deletions

diff --git a/src/feature/nodelist/networkstatus.c b/src/feature/nodelist/networkstatus.c
index 496bafb865..b4b98301b0 100644
--- a/src/feature/nodelist/networkstatus.c
+++ b/src/feature/nodelist/networkstatus.c
@@ -216,10 +216,10 @@ networkstatus_reset_download_failures(void)
 }
 
 /** Return the filename used to cache the consensus of a given flavor */
-static char *
-networkstatus_get_cache_fname(int flav,
-                              const char *flavorname,
-                              int unverified_consensus)
+MOCK_IMPL(char *,
+networkstatus_get_cache_fname,(int flav,
+                               const char *flavorname,
+                               int unverified_consensus))
 {
   char buf[128];
   const char *prefix;
diff --git a/src/feature/nodelist/networkstatus.h b/src/feature/nodelist/networkstatus.h
index 600fd7fbd5..e2c6ba611a 100644
--- a/src/feature/nodelist/networkstatus.h
+++ b/src/feature/nodelist/networkstatus.h
@@ -16,6 +16,9 @@
 
 void networkstatus_reset_warnings(void);
 void networkstatus_reset_download_failures(void);
+MOCK_DECL(char *,networkstatus_get_cache_fname,(int flav,
+                                                const char *flavorname,
+                                                int unverified_consensus));
 tor_mmap_t *networkstatus_map_cached_consensus(const char *flavorname);
 int router_reload_consensus_networkstatus(void);
 void routerstatus_free_(routerstatus_t *rs);