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michael |
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/* Ignore handling. |
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* |
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* IRC Services is copyright (c) 1996-2009 Andrew Church. |
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* E-mail: <achurch@achurch.org> |
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* Parts written by Andrew Kempe and others. |
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* This program is free but copyrighted software; see the file GPL.txt for |
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* details. |
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*/ |
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#include "services.h" |
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/*************************************************************************/ |
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/* ignore_init: Initialize ignore-related fields of a new User structure. */ |
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void ignore_init(User *u) |
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{ |
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u->ignore = 0; |
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u->lastcmd = time_msec(); |
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u->lastcmd_s = time(NULL); |
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} |
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/*************************************************************************/ |
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/* ignore_update: Update the user's ignore level. The "ignore level" is a |
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* measure of how much time Services has spent processing |
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* this user's commands, and is calculated as a decaying |
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* average of the fraction of time spent on the user's |
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* commands over the total time Services has been running-- |
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* more specifically, the average over time of a function |
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* whose value is 1 when Services is executing a command |
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* from the user and 0 at all other times. The rate of |
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* decay of the average, and hence the rate of response to |
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* new commands, is dependent on the IgnoreDecay |
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* configuration setting: the average decays by half every |
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* IgnoreDecay milliseconds (note that the value is given as |
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* seconds in the configuration file). |
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* The `msec' parameter to this function is the length |
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* of time taken by the most recent command (which caused |
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* this update). `msec' may be specified as zero to update |
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* the user's ignore level at any time. |
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*/ |
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void ignore_update(User *u, uint32 msec) |
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{ |
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time_t now; |
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uint32 now_msec; |
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if (!IgnoreDecay) { |
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/* Ignore code disabled, just return */ |
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return; |
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} |
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now = time(NULL); |
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now_msec = time_msec(); |
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if (now - u->lastcmd_s > 1000000) { |
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/* Millisecond counter may have overflowed, just reset to 0 */ |
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u->ignore = 0; |
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} else { |
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double zerolen = (now_msec - msec) - u->lastcmd; |
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if (zerolen > 0) |
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u->ignore *= pow(2, -(zerolen / IgnoreDecay)); |
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} |
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if (msec) { |
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double factor; |
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while (msec > IgnoreDecay) { |
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u->ignore = u->ignore*0.5 + 0.5; |
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msec -= IgnoreDecay; |
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} |
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factor = pow(2, -((double)msec / IgnoreDecay)); |
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u->ignore = u->ignore*factor + (1-factor); |
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} |
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u->lastcmd = now_msec; |
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u->lastcmd_s = now; |
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} |
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/*************************************************************************/ |
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/* |
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* Local variables: |
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* c-file-style: "stroustrup" |
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* c-file-offsets: ((case-label . *) (statement-case-intro . *)) |
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* indent-tabs-mode: nil |
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* End: |
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* |
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* vim: expandtab shiftwidth=4: |
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*/ |
