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UI: Prevent writing endlessly repeating log entries

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Limits similar log entries (determined by a simple hash function that
sums the characters) to certain number of lines in a row.  When a
different log entry occurs, it resets the repeat check and logs how many
times the last message was repeated.
This commit is contained in:
jp9000 2015-09-07 11:20:48 -07:00
parent 9d940249bb
commit c23c0f4615
1 changed files with 51 additions and 0 deletions
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51
obs/obs-app.cpp
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@ -21,6 +21,7 @@
#include <chrono>
#include <ratio>
#include <sstream>
#include <mutex>
#include <util/bmem.h>
#include <util/dstr.h>
#include <util/platform.h>
@ -237,6 +238,53 @@ static inline void LogStringChunk(fstream &logFile, char *str)
LogString(logFile, timeString.c_str(), str);
}
#define MAX_REPEATED_LINES 30
#define MAX_CHAR_VARIATION (255 * 3)
static inline int sum_chars(const char *str)
{
int val = 0;
for (; *str != 0; str++)
val += *str;
return val;
}
static inline bool too_many_repeated_entries(fstream &logFile, const char *msg,
const char *output_str)
{
static mutex log_mutex;
static const char *last_msg_ptr = nullptr;
static int last_char_sum = 0;
static char cmp_str[4096];
static int rep_count = 0;
int new_sum = sum_chars(output_str);
lock_guard<mutex> guard(log_mutex);
if (last_msg_ptr == msg) {
int diff = std::abs(new_sum - last_char_sum);
if (diff < MAX_CHAR_VARIATION) {
return (rep_count++ >= MAX_REPEATED_LINES);
}
}
if (rep_count > MAX_REPEATED_LINES) {
logFile << CurrentTimeString() <<
": Last log entry repeated for " <<
to_string(rep_count - MAX_REPEATED_LINES) <<
" more lines" << endl;
}
last_msg_ptr = msg;
strcpy(cmp_str, output_str);
last_char_sum = new_sum;
rep_count = 0;
return false;
}
static void do_log(int log_level, const char *msg, va_list args, void *param)
{
fstream &logFile = *static_cast<fstream*>(param);
@ -256,6 +304,9 @@ static void do_log(int log_level, const char *msg, va_list args, void *param)
def_log_handler(log_level, msg, args2, nullptr);
#endif
if (too_many_repeated_entries(logFile, msg, str))
return;
if (log_level <= LOG_INFO)
LogStringChunk(logFile, str);