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Implements token bucket filter for rate limiting.

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This commit is contained in:
Ondrej Zajicek
2014-10-02 11:41:34 +02:00
parent dcde7ae597
commit 1123e70740
10 changed files with 85 additions and 42 deletions
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28
sysdep/unix/log.c
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@@ -32,9 +32,6 @@ static FILE *dbgf;
static list *current_log_list;
static char *current_syslog_name; /* NULL -> syslog closed */
static const bird_clock_t rate_limit_time = 5;
static const int rate_limit_count = 5;
#ifdef USE_PTHREADS
@@ -154,7 +151,6 @@ vlog(int class, const char *msg, va_list args)
}
/**
* log - log a message
* @msg: printf-like formatting string with message class information
@@ -180,31 +176,21 @@ log_msg(char *msg, ...)
}
void
log_rl(struct rate_limit *rl, char *msg, ...)
log_rl(struct tbf *f, char *msg, ...)
{
int last_hit = f->mark;
int class = 1;
va_list args;
bird_clock_t delta = now - rl->timestamp;
if ((0 <= delta) && (delta < rate_limit_time))
{
rl->count++;
}
else
{
rl->timestamp = now;
rl->count = 1;
}
if (rl->count > rate_limit_count)
/* Rate limiting is a bit tricky here as it also logs '...' during the first hit */
if (tbf_limit(f) && last_hit)
return;
va_start(args, msg);
if (*msg >= 1 && *msg <= 8)
class = *msg++;
vlog(class, msg, args);
if (rl->count == rate_limit_count)
vlog(class, "...", args);
va_start(args, msg);
vlog(class, (f->mark ? "..." : msg), args);
va_end(args);
}