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volume.go
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volume.go
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package client
import (
"io"
"sync"
"time"
"code.cloudfoundry.org/lager"
"github.com/concourse/baggageclaim"
"github.com/concourse/baggageclaim/volume"
)
type clientVolume struct {
// TODO: this would be much better off as an arg to each method
logger lager.Logger
handle string
path string
bcClient *client
releaseOnce sync.Once
heartbeating *sync.WaitGroup
release chan *time.Duration
}
func (cv *clientVolume) Handle() string {
return cv.handle
}
func (cv *clientVolume) Path() string {
return cv.path
}
func (cv *clientVolume) SizeInBytes() (int64, error) {
stats, err := cv.bcClient.getVolumeStatsResponse(cv.logger, cv.handle)
if err != nil {
return 0, err
}
return stats.SizeInBytes, nil
}
func (cv *clientVolume) Properties() (baggageclaim.VolumeProperties, error) {
vr, found, err := cv.bcClient.getVolumeResponse(cv.logger, cv.handle)
if err != nil {
return nil, err
}
if !found {
return nil, volume.ErrVolumeDoesNotExist
}
return vr.Properties, nil
}
func (cv *clientVolume) Expiration() (time.Duration, time.Time, error) {
vr, found, err := cv.bcClient.getVolumeResponse(cv.logger, cv.handle)
if err != nil {
return 0, time.Time{}, err
}
if !found {
return 0, time.Time{}, volume.ErrVolumeDoesNotExist
}
return time.Duration(vr.TTLInSeconds) * time.Second, vr.ExpiresAt, nil
}
func (cv *clientVolume) StreamIn(path string, tarStream io.Reader) error {
return cv.bcClient.streamIn(cv.logger, cv.handle, path, tarStream)
}
func (cv *clientVolume) StreamOut(path string) (io.ReadCloser, error) {
return cv.bcClient.streamOut(cv.logger, cv.handle, path)
}
func (cv *clientVolume) SetTTL(ttl time.Duration) error {
return cv.bcClient.setTTL(cv.logger, cv.handle, ttl)
}
func (cv *clientVolume) SetPrivileged(privileged bool) error {
return cv.bcClient.setPrivileged(cv.logger, cv.handle, privileged)
}
func (cv *clientVolume) Destroy() error {
return cv.bcClient.destroy(cv.logger, cv.handle)
}
func (cv *clientVolume) SetProperty(name string, value string) error {
return cv.bcClient.setProperty(cv.logger, cv.handle, name, value)
}
func (cv *clientVolume) Release(finalTTL *time.Duration) {
cv.releaseOnce.Do(func() {
cv.release <- finalTTL
cv.heartbeating.Wait()
})
return
}
func IntervalForTTL(ttl time.Duration) time.Duration {
interval := ttl / 2
if interval > time.Minute {
interval = time.Minute
}
return interval
}
func (cv *clientVolume) startHeartbeating(logger lager.Logger, ttl time.Duration) bool {
interval := IntervalForTTL(ttl)
if !cv.heartbeatTick(logger.Session("initial-heartbeat"), ttl) {
return false
}
cv.heartbeating.Add(1)
go cv.heartbeat(logger.Session("heartbeating"), ttl, time.NewTicker(interval))
return true
}
func (cv *clientVolume) heartbeat(logger lager.Logger, ttl time.Duration, pacemaker *time.Ticker) {
defer cv.heartbeating.Done()
defer pacemaker.Stop()
logger.Debug("start")
defer logger.Debug("done")
for {
select {
case <-pacemaker.C:
if !cv.heartbeatTick(logger.Session("tick"), ttl) {
return
}
case finalTTL := <-cv.release:
if finalTTL != nil {
cv.heartbeatTick(logger.Session("final"), *finalTTL)
}
return
}
}
}
func (cv *clientVolume) heartbeatTick(logger lager.Logger, ttl time.Duration) bool {
logger.Debug("start")
err := cv.SetTTL(ttl)
if err == baggageclaim.ErrVolumeNotFound {
logger.Info("volume-disappeared")
return false
}
if err != nil {
logger.Error("failed", err)
} else {
logger.Debug("done")
}
return true
}