/** Initialize the accounting subsystem. */
void
configure_accounting(time_t now)
{
/* Try to remember our recorded usage. */
if (!interval_start_time)
read_bandwidth_usage(); /* If we fail, we'll leave values at zero, and
* reset below.*/
if (!interval_start_time ||
start_of_accounting_period_after(interval_start_time) <= now) {
/* We didn't have recorded usage, or we don't have recorded usage
* for this interval. Start a new interval. */
log_info(LD_ACCT, "Starting new accounting interval.");
reset_accounting(now);
} else if (interval_start_time ==
start_of_accounting_period_containing(interval_start_time)) {
log_info(LD_ACCT, "Continuing accounting interval.");
/* We are in the interval we thought we were in. Do nothing.*/
interval_end_time = start_of_accounting_period_after(interval_start_time);
} else {
log_warn(LD_ACCT,
"Mismatched accounting interval; starting a fresh one.");
reset_accounting(now);
}
accounting_set_wakeup_time();
}
/** Initialize the accounting subsystem. */
void
configure_accounting(time_t now)
{
time_t s_now;
/* Try to remember our recorded usage. */
if (!interval_start_time)
read_bandwidth_usage(); /* If we fail, we'll leave values at zero, and
* reset below.*/
s_now = start_of_accounting_period_containing(now);
if (!interval_start_time) {
/* We didn't have recorded usage; Start a new interval. */
log_info(LD_ACCT, "Starting new accounting interval.");
reset_accounting(now);
} else if (s_now == interval_start_time) {
log_info(LD_ACCT, "Continuing accounting interval.");
/* We are in the interval we thought we were in. Do nothing.*/
interval_end_time = start_of_accounting_period_after(interval_start_time);
} else {
long duration =
length_of_accounting_period_containing(interval_start_time);
double delta = ((double)(s_now - interval_start_time)) / duration;
if (-0.50 <= delta && delta <= 0.50) {
/* The start of the period is now a little later or earlier than we
* remembered. That's fine; we might lose some bytes we could otherwise
* have written, but better to err on the side of obeying people's
* accounting settings. */
log_info(LD_ACCT, "Accounting interval moved by %.02f%%; "
"that's fine.", delta*100);
interval_end_time = start_of_accounting_period_after(now);
} else if (delta >= 0.99) {
/* This is the regular time-moved-forward case; don't be too noisy
* about it or people will complain */
log_info(LD_ACCT, "Accounting interval elapsed; starting a new one");
reset_accounting(now);
} else {
log_warn(LD_ACCT,
"Mismatched accounting interval: moved by %.02f%%. "
"Starting a fresh one.", delta*100);
reset_accounting(now);
}
}
accounting_set_wakeup_time();
}
/** Called at the start of a new accounting interval: reset our
* expected bandwidth usage based on what happened last time, set up
* the start and end of the interval, and clear byte/time totals.
*/
static void
reset_accounting(time_t now)
{
log_info(LD_ACCT, "Starting new accounting interval.");
update_expected_bandwidth();
interval_start_time = start_of_accounting_period_containing(now);
interval_end_time = start_of_accounting_period_after(interval_start_time);
n_bytes_read_in_interval = 0;
n_bytes_written_in_interval = 0;
n_seconds_active_in_interval = 0;
}