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Introduce get_packet_lag()

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Jan Grashoefer 2024-12-09 19:19:29 +01:00
parent 6977c07a25
commit c2b17f9d30
3 changed files with 29 additions and 11 deletions
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20
scripts/base/utils/time.zeek
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@ -1,3 +1,4 @@
##! Time-related functions.
## Given an interval, returns a string representing the minutes and seconds
## in the interval (for example, "3m34s").
@ -6,3 +7,22 @@ function duration_to_mins_secs(dur: interval): string
local dur_count = double_to_count(interval_to_double(dur));
return fmt("%dm%ds", dur_count/60, dur_count%60);
}
## Time value representing the 0 timestamp.
const null_ts = double_to_time(0);
## Calculate the packet lag, i.e. the difference between wall clock and the
## timestamp of the currently processed packet. If Zeek is not processing a
## packet, the function returns a 0 interval value.
function get_packet_lag(): interval
{
# We use get_current_packet_ts() instead of network_time() here, because
# network time does not immediately fall back to wall clock if there is
# no packet. Instead, network time remains set to the last seen packet's
# timestamp for ``packet_source_inactivity_timeout``.
local pkt_ts = get_current_packet_ts();
if (pkt_ts == null_ts)
return 0 sec;
return current_time() - pkt_ts;
}