Basic functionality for access counters and real-time statistics
were built-into DeleGate/9.2.0.
It is applied not only to access count from clients but also to
general counts including Referers, errors, and more, in future.
So far, the following counters have been implemented.
count for each requested URL on origin/proxy HTTP DeleGate
count for each Referer URL on origin/proxy HTTP DeleGate
count for each transferred file on origin FTP DeleGate
count for each error or rejection in SMTP DeleGate
count for each session of FTP, SMTP, NNTP DeleGate
count for each packet incoming to DNS DeleGate
This built-in counter is intended to be used to show real-time
statistics of DeleGate servers too.
It will be convenient to be able to get statistics in real-time
and without keeping a large volume of log files.
Counters are enabled with the
as follows in the simplest.
A SSI tag "COUNTER" is introduced to show values in counters.
The simplest example is the access counter of the SHTML page including
<!--#echo var=COUNTER -->
There are three types of counters based on (client's) IP address;
the first one is incremented on every hit, the second one is incremented
excluding repetitive hit by the same IP address, and the third one is
incremented excluding repetitive hit by one of last ten IP addresses.
Each counter is represented with
%T, %U, and %V respectively in a
format string given by the fmt="formatString" attribute.
Yet another count is "network count" which is represented as "%N"
in the format string.
It is introduced to be a metrics of the coverage or distribution of
(client's) IP addresses on the address space.
It is not a counter incremented on each hit, but the
number of bits in a bit map of network addresses.
In the current implementation, the width of the network mask is 10 bits,
therefore the logical maximum number of "%N" is 1024.
The map of networks can be shown with "%M" as follows.
In the map, each true bit is marked with 'X' while false
bit is marked with '-'.
The recent ten networks are marked with a digit from
'0' to '9'.
The recent ten IP addresses can be shown with "%L" as follows.
<!--#echo var=COUNTER fmt="%L" -->
LAST[ 0] 22C00091 34.D
This table of recent 10 addresses is managed in the LRU order, that is
the entry of the least recentry hit is pushed out from the table.