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Add method for checking if a string is (probably) a log message
When reading log output from QEMU/LXC we need to skip over any libvirt log messages. Currently the QEMU driver checks for a fixed string, but this is better done with a regex. Add a method virLogProbablyLogMessage to do a regex check Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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@ -1429,6 +1429,7 @@ virLogMessage;
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virLogParseDefaultPriority;
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virLogParseFilters;
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virLogParseOutputs;
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virLogProbablyLogMessage;
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virLogReset;
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virLogSetBufferSize;
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virLogSetDefaultPriority;
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@ -32,6 +32,7 @@
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#include <unistd.h>
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#include <signal.h>
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#include <execinfo.h>
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#include <regex.h>
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#if HAVE_SYSLOG_H
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# include <syslog.h>
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#endif
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@ -75,6 +76,17 @@ static char *virLogBuffer = NULL;
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static int virLogLen = 0;
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static int virLogStart = 0;
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static int virLogEnd = 0;
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static regex_t *virLogRegex = NULL;
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#define VIR_LOG_DATE_REGEX "[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]"
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#define VIR_LOG_TIME_REGEX "[0-9][0-9]:[0-9][0-9]:[0-9][0-9].[0-9][0-9][0-9]+[0-9][0-9][0-9][0-9]"
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#define VIR_LOG_PID_REGEX "[0-9]+"
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#define VIR_LOG_LEVEL_REGEX "debug|info|warning|error"
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#define VIR_LOG_REGEX \
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VIR_LOG_DATE_REGEX " " VIR_LOG_TIME_REGEX ": " \
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VIR_LOG_PID_REGEX ": " VIR_LOG_LEVEL_REGEX " : "
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/*
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* Filters are used to refine the rules on what to keep or drop
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@ -209,6 +221,12 @@ virLogOnceInit(void)
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virLogStart = 0;
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virLogEnd = 0;
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virLogDefaultPriority = VIR_LOG_DEFAULT;
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if (VIR_ALLOC(virLogRegex) >= 0) {
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if (regcomp(virLogRegex, VIR_LOG_REGEX, REG_EXTENDED) != 0)
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VIR_FREE(virLogRegex);
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}
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virLogUnlock();
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if (pbm)
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VIR_WARN("%s", pbm);
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@ -1587,3 +1605,19 @@ virLogSetFromEnv(void)
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if (debugEnv && *debugEnv)
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virLogParseOutputs(debugEnv);
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}
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/*
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* Returns a true value if the first line in @str is
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* probably a log message generated by the libvirt
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* logging layer
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*/
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bool virLogProbablyLogMessage(const char *str)
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{
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bool ret = false;
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if (!virLogRegex)
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return false;
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if (regexec(virLogRegex, str, 0, NULL, 0) == 0)
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ret = true;
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return ret;
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}
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@ -188,4 +188,7 @@ extern void virLogVMessage(virLogSource src,
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va_list vargs) ATTRIBUTE_FMT_PRINTF(7, 0);
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extern int virLogSetBufferSize(int size);
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extern void virLogEmergencyDumpAll(int signum);
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bool virLogProbablyLogMessage(const char *str);
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#endif
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