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fsHandler.go
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/
fsHandler.go
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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Handler for Docker containers.
package common
import (
"fmt"
"sync"
"time"
"github.com/google/cadvisor/fs"
"github.com/golang/glog"
)
type FsHandler interface {
Start()
Usage() FsUsage
Stop()
}
type FsUsage struct {
BaseUsageBytes uint64
TotalUsageBytes uint64
InodeUsage uint64
}
type realFsHandler struct {
sync.RWMutex
lastUpdate time.Time
usage FsUsage
period time.Duration
minPeriod time.Duration
rootfs string
extraDir string
fsInfo fs.FsInfo
// Tells the container to stop.
stopChan chan struct{}
}
const (
longOp = time.Second
timeout = 2 * time.Minute
maxBackoffFactor = 20
)
const DefaultPeriod = time.Minute
var _ FsHandler = &realFsHandler{}
func NewFsHandler(period time.Duration, rootfs, extraDir string, fsInfo fs.FsInfo) FsHandler {
return &realFsHandler{
lastUpdate: time.Time{},
usage: FsUsage{},
period: period,
minPeriod: period,
rootfs: rootfs,
extraDir: extraDir,
fsInfo: fsInfo,
stopChan: make(chan struct{}, 1),
}
}
func (fh *realFsHandler) update() error {
var (
baseUsage, extraDirUsage, inodeUsage uint64
rootDiskErr, rootInodeErr, extraDiskErr error
)
// TODO(vishh): Add support for external mounts.
if fh.rootfs != "" {
baseUsage, rootDiskErr = fh.fsInfo.GetDirDiskUsage(fh.rootfs, timeout)
inodeUsage, rootInodeErr = fh.fsInfo.GetDirInodeUsage(fh.rootfs, timeout)
}
if fh.extraDir != "" {
extraDirUsage, extraDiskErr = fh.fsInfo.GetDirDiskUsage(fh.extraDir, timeout)
}
// Wait to handle errors until after all operartions are run.
// An error in one will not cause an early return, skipping others
fh.Lock()
defer fh.Unlock()
fh.lastUpdate = time.Now()
if rootDiskErr == nil && fh.rootfs != "" {
fh.usage.InodeUsage = inodeUsage
}
if rootInodeErr == nil && fh.rootfs != "" {
fh.usage.TotalUsageBytes = baseUsage + extraDirUsage
}
if extraDiskErr == nil && fh.extraDir != "" {
fh.usage.BaseUsageBytes = baseUsage
}
// Combine errors into a single error to return
if rootDiskErr != nil || rootInodeErr != nil || extraDiskErr != nil {
return fmt.Errorf("rootDiskErr: %v, rootInodeErr: %v, extraDiskErr: %v", rootDiskErr, rootInodeErr, extraDiskErr)
}
return nil
}
func (fh *realFsHandler) trackUsage() {
fh.update()
for {
select {
case <-fh.stopChan:
return
case <-time.After(fh.period):
start := time.Now()
if err := fh.update(); err != nil {
glog.Errorf("failed to collect filesystem stats - %v", err)
fh.period = fh.period * 2
if fh.period > maxBackoffFactor*fh.minPeriod {
fh.period = maxBackoffFactor * fh.minPeriod
}
} else {
fh.period = fh.minPeriod
}
duration := time.Since(start)
if duration > longOp {
glog.V(2).Infof("du and find on following dirs took %v: %v", duration, []string{fh.rootfs, fh.extraDir})
}
}
}
}
func (fh *realFsHandler) Start() {
go fh.trackUsage()
}
func (fh *realFsHandler) Stop() {
close(fh.stopChan)
}
func (fh *realFsHandler) Usage() FsUsage {
fh.RLock()
defer fh.RUnlock()
return fh.usage
}