/** Consider our environment and decide if it's time
* to start/stop hibernating.
*/
void
consider_hibernation(time_t now)
{
int accounting_enabled = get_options()->AccountingMax != 0;
char buf[ISO_TIME_LEN+1];
/* If we're in 'exiting' mode, then we just shut down after the interval
* elapses. */
if (hibernate_state == HIBERNATE_STATE_EXITING) {
tor_assert(shutdown_time);
if (shutdown_time <= now) {
log_notice(LD_GENERAL, "Clean shutdown finished. Exiting.");
tor_cleanup();
exit(0);
}
return; /* if exiting soon, don't worry about bandwidth limits */
}
if (hibernate_state == HIBERNATE_STATE_DORMANT) {
/* We've been hibernating because of bandwidth accounting. */
tor_assert(hibernate_end_time);
if (hibernate_end_time > now && accounting_enabled) {
/* If we're hibernating, don't wake up until it's time, regardless of
* whether we're in a new interval. */
return ;
} else {
hibernate_end_time_elapsed(now);
}
}
/* Else, we aren't hibernating. See if it's time to start hibernating, or to
* go dormant. */
if (hibernate_state == HIBERNATE_STATE_LIVE) {
if (hibernate_soft_limit_reached()) {
log_notice(LD_ACCT,
"Bandwidth soft limit reached; commencing hibernation.");
hibernate_begin(HIBERNATE_STATE_LOWBANDWIDTH, now);
} else if (accounting_enabled && now < interval_wakeup_time) {
format_local_iso_time(buf,interval_wakeup_time);
log_notice(LD_ACCT,
"Commencing hibernation. We will wake up at %s local time.",
buf);
hibernate_go_dormant(now);
}
}
if (hibernate_state == HIBERNATE_STATE_LOWBANDWIDTH) {
if (!accounting_enabled) {
hibernate_end_time_elapsed(now);
} else if (hibernate_hard_limit_reached()) {
hibernate_go_dormant(now);
} else if (hibernate_end_time <= now) {
/* The hibernation period ended while we were still in lowbandwidth.*/
hibernate_end_time_elapsed(now);
}
}
}
/** If we aren't currently dormant, close all connections and become
* dormant. */
static void
hibernate_go_dormant(time_t now)
{
connection_t *conn;
if (hibernate_state == HIBERNATE_STATE_DORMANT)
return;
else if (hibernate_state == HIBERNATE_STATE_LOWBANDWIDTH)
hibernate_state = HIBERNATE_STATE_DORMANT;
else
hibernate_begin(HIBERNATE_STATE_DORMANT, now);
log_notice(LD_ACCT,"Going dormant. Blowing away remaining connections.");
/* Close all OR/AP/exit conns. Leave dir conns because we still want
* to be able to upload server descriptors so people know we're still
* running, and download directories so we can detect if we're obsolete.
* Leave control conns because we still want to be controllable.
*/
while ((conn = connection_get_by_type(CONN_TYPE_OR)) ||
(conn = connection_get_by_type(CONN_TYPE_AP)) ||
(conn = connection_get_by_type(CONN_TYPE_EXIT))) {
if (CONN_IS_EDGE(conn))
connection_edge_end(TO_EDGE_CONN(conn), END_STREAM_REASON_HIBERNATING);
log_info(LD_NET,"Closing conn type %d", conn->type);
if (conn->type == CONN_TYPE_AP) /* send socks failure if needed */
connection_mark_unattached_ap(TO_ENTRY_CONN(conn),
END_STREAM_REASON_HIBERNATING);
else if (conn->type == CONN_TYPE_OR) {
if (TO_OR_CONN(conn)->chan) {
channel_mark_for_close(TLS_CHAN_TO_BASE(TO_OR_CONN(conn)->chan));
} else {
connection_mark_for_close(conn);
}
} else
connection_mark_for_close(conn);
}
if (now < interval_wakeup_time)
hibernate_end_time = interval_wakeup_time;
else
hibernate_end_time = interval_end_time;
accounting_record_bandwidth_usage(now, get_or_state());
or_state_mark_dirty(get_or_state(),
get_options()->AvoidDiskWrites ? now+600 : 0);
}
/** A wrapper around hibernate_begin, for when we get SIGINT. */
void
hibernate_begin_shutdown(void)
{
hibernate_begin(HIBERNATE_STATE_EXITING, time(NULL));
}