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Added another lock to protect broker stats

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Added another lock to the metrics struct to synchronize accesses to the
broker stats. There's a possible race condition if stats are updated at
the same time they are being logged.
This commit is contained in:
Cecylia Bocovich 2019-12-02 13:22:05 -05:00
parent 42e16021c4
commit 06298eec73
2 changed files with 14 additions and 1 deletions
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5
broker/metrics.go
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@ -39,6 +39,9 @@ type Metrics struct {
proxyIdleCount uint
clientDeniedCount uint
clientProxyMatchCount uint
//synchronization for access to snowflake metrics
lock sync.Mutex
}
func (s CountryStats) Display() string {
@ -161,6 +164,7 @@ func (m *Metrics) logMetrics() {
}
func (m *Metrics) printMetrics() {
m.lock.Lock()
m.logger.Println("snowflake-stats-end", time.Now().UTC().Format("2006-01-02 15:04:05"), fmt.Sprintf("(%d s)", int(metricsResolution.Seconds())))
m.logger.Println("snowflake-ips", m.countryStats.Display())
m.logger.Println("snowflake-ips-total", len(m.countryStats.standalone)+
@ -171,6 +175,7 @@ func (m *Metrics) printMetrics() {
m.logger.Println("snowflake-idle-count", binCount(m.proxyIdleCount))
m.logger.Println("client-denied-count", binCount(m.clientDeniedCount))
m.logger.Println("client-snowflake-match-count", binCount(m.clientProxyMatchCount))
m.lock.Unlock()
}
// Restores all metrics to original values