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Fix ntp collector thread safety (#1014)

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Make the ntp collector thread safe by wrapping a mutex lock around the
leapMidnight variable.

Signed-off-by: Ben Kochie <superq@gmail.com>
This commit is contained in:
Ben Kochie 2018-07-22 14:36:33 +02:00 committed by GitHub
parent 140b8b85c3
commit 23f95c8e04
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 1 deletions
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6
collector/ntp.go
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@ -18,6 +18,7 @@ package collector
import (
"fmt"
"net"
"sync"
"time"
"github.com/beevik/ntp"
@ -40,7 +41,8 @@ var (
ntpMaxDistance = kingpin.Flag("collector.ntp.max-distance", "Max accumulated distance to the root").Default("3.46608s").Duration()
ntpOffsetTolerance = kingpin.Flag("collector.ntp.local-offset-tolerance", "Offset between local clock and local ntpd time to tolerate").Default("1ms").Duration()
leapMidnight time.Time
leapMidnight time.Time
leapMidnightMutex = &sync.Mutex{}
)
type ntpCollector struct {
@ -143,6 +145,7 @@ func (c *ntpCollector) Update(ch chan<- prometheus.Metric) error {
// configuration from node_exporter user to the developer.
maxerr := *ntpOffsetTolerance
leapMidnightMutex.Lock()
if resp.Leap == ntp.LeapAddSecond || resp.Leap == ntp.LeapDelSecond {
// state of leapMidnight is cached as leap flag is dropped right after midnight
leapMidnight = resp.Time.Truncate(hour24).Add(hour24)
@ -151,6 +154,7 @@ func (c *ntpCollector) Update(ch chan<- prometheus.Metric) error {
// tolerate leap smearing
maxerr += time.Second
}
leapMidnightMutex.Unlock()
if resp.Validate() == nil && resp.RootDistance <= *ntpMaxDistance && resp.MinError <= maxerr {
ch <- c.sanity.mustNewConstMetric(1)