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file_descriptor_metron_notifier.go
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/
file_descriptor_metron_notifier.go
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package metrics
import (
"io/ioutil"
"os"
"github.com/tedsuo/ifrit"
"code.cloudfoundry.org/clock"
loggingclient "code.cloudfoundry.org/diego-logging-client"
"code.cloudfoundry.org/lager"
)
const (
OpenFileDescriptorsMetric = "OpenFileDescriptors"
FileDescriptorUnits = "descriptors"
)
type FileDescriptorMetronNotifier struct {
Logger lager.Logger
metronClient loggingclient.IngressClient
ticker clock.Ticker
procFSPath string
}
func NewFileDescriptorMetronNotifier(logger lager.Logger, newTicker clock.Ticker, metronClient loggingclient.IngressClient, procPath string) ifrit.Runner {
return &FileDescriptorMetronNotifier{
Logger: logger,
metronClient: metronClient,
ticker: newTicker,
procFSPath: procPath,
}
}
func (notifier FileDescriptorMetronNotifier) Run(signals <-chan os.Signal, ready chan<- struct{}) error {
logger := notifier.Logger.Session("file-descriptor-notifier")
logger.Info("starting")
close(ready)
logger.Info("started")
defer logger.Info("finished")
for {
select {
case <-notifier.ticker.C():
nDescriptors, err := notifier.descriptorCount()
if err != nil {
logger.Error("failed-to-read-proc-filesystem", err)
continue
}
err = notifier.metronClient.SendMetric(OpenFileDescriptorsMetric, nDescriptors)
if err != nil {
logger.Error("error-sending-metric", err)
}
case <-signals:
return nil
}
}
}
func (notifier FileDescriptorMetronNotifier) descriptorCount() (int, error) {
descriptorInfos, err := ioutil.ReadDir(notifier.procFSPath)
if err != nil {
return 0, err
}
count := 0
for range descriptorInfos {
count++
}
return count, nil
}