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measurer_linux.go
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measurer_linux.go
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package store
import (
"syscall"
"code.cloudfoundry.org/lager"
errorspkg "github.com/pkg/errors"
)
//go:generate counterfeiter . VolumeDriver
type VolumeDriver interface {
Volumes(logger lager.Logger) ([]string, error)
VolumeSize(lager.Logger, string) (int64, error)
}
type StoreMeasurer struct {
storePath string
volumeDriver VolumeDriver
}
func NewStoreMeasurer(storePath string, volumeDriver VolumeDriver) *StoreMeasurer {
return &StoreMeasurer{
storePath: storePath,
volumeDriver: volumeDriver,
}
}
func (s *StoreMeasurer) Usage(logger lager.Logger) (int64, error) {
logger = logger.Session("measuring-store", lager.Data{"storePath": s.storePath})
logger.Debug("starting")
defer logger.Debug("ending")
_, used, err := s.pathStats(s.storePath)
if err != nil {
return 0, errorspkg.Wrapf(err, "Invalid path %s", s.storePath)
}
logger.Debug("store-usage", lager.Data{"bytes": used})
return used, nil
}
func (s *StoreMeasurer) CacheUsage(logger lager.Logger, unusedVolumes []string) int64 {
var size int64
for _, volume := range unusedVolumes {
volumeSize, err := s.volumeDriver.VolumeSize(logger, volume)
if err != nil {
logger.Error("fetching-volume-size-failed", err, lager.Data{"volume": volume})
continue
}
size += volumeSize
}
return size
}
func (s *StoreMeasurer) pathStats(path string) (totalBytes, UsedBytes int64, err error) {
stats := syscall.Statfs_t{}
if err = syscall.Statfs(s.storePath, &stats); err != nil {
return 0, 0, errorspkg.Wrapf(err, "Invalid path %s", s.storePath)
}
bsize := uint64(stats.Bsize)
free := stats.Bfree * bsize
total := stats.Blocks * bsize
used := int64(total - free)
return int64(total), used, nil
}