diff options
Diffstat (limited to 'src/or')
| -rw-r--r-- | src/or/shared_random_state.c | 20 | ||||
| -rw-r--r-- | src/or/shared_random_state.h | 2 |
2 files changed, 22 insertions, 0 deletions
diff --git a/src/or/shared_random_state.c b/src/or/shared_random_state.c index 89d2e8d7f6..1fc1440d0d 100644 --- a/src/or/shared_random_state.c +++ b/src/or/shared_random_state.c @@ -156,6 +156,26 @@ get_start_time_of_current_round(time_t now) return curr_start; } +/** Return the start time of the current SR protocol run. For example, if the + * time is 23/06/2017 23:47:08 and a full SR protocol run is 24 hours, this + * function should return 23/06/2017 00:00:00. */ +time_t +sr_state_get_start_time_of_current_protocol_run(time_t now) +{ + int total_rounds = SHARED_RANDOM_N_ROUNDS * SHARED_RANDOM_N_PHASES; + int voting_interval = get_voting_interval(); + /* Find the time the current round started. */ + time_t beginning_of_current_round = get_start_time_of_current_round(now); + + /* Get current SR protocol round */ + int current_round = (now / voting_interval) % total_rounds; + + /* Get start time by subtracting the time elapsed from the beginning of the + protocol run */ + time_t time_elapsed_since_start_of_run = current_round * voting_interval; + return beginning_of_current_round - time_elapsed_since_start_of_run; +} + /* Return the time we should expire the state file created at <b>now</b>. * We expire the state file in the beginning of the next protocol run. */ STATIC time_t diff --git a/src/or/shared_random_state.h b/src/or/shared_random_state.h index 3526ad47d3..ae1c5ac219 100644 --- a/src/or/shared_random_state.h +++ b/src/or/shared_random_state.h @@ -121,6 +121,8 @@ int sr_state_is_initialized(void); void sr_state_save(void); void sr_state_free(void); +time_t sr_state_get_start_time_of_current_protocol_run(time_t now); + #ifdef SHARED_RANDOM_STATE_PRIVATE STATIC int disk_state_load_from_disk_impl(const char *fname); |