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memory.go
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memory.go
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// Copyright 2014 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.
package memory
import (
"fmt"
"sync"
"time"
"github.com/golang/glog"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/storage"
"github.com/google/cadvisor/utils"
)
// TODO(vmarmol): See about refactoring this class, we have an unecessary redirection of containerStorage and InMemoryStorage.
// containerStorage is used to store per-container information
type containerStorage struct {
ref info.ContainerReference
recentStats *utils.TimedStore
maxAge time.Duration
lock sync.RWMutex
}
func (self *containerStorage) AddStats(stats *info.ContainerStats) error {
self.lock.Lock()
defer self.lock.Unlock()
// Add the stat to storage.
self.recentStats.Add(stats.Timestamp, stats)
return nil
}
func (self *containerStorage) RecentStats(start, end time.Time, maxStats int) ([]*info.ContainerStats, error) {
self.lock.RLock()
defer self.lock.RUnlock()
result := self.recentStats.InTimeRange(start, end, maxStats)
converted := make([]*info.ContainerStats, len(result))
for i, el := range result {
converted[i] = el.(*info.ContainerStats)
}
return converted, nil
}
func newContainerStore(ref info.ContainerReference, maxAge time.Duration) *containerStorage {
return &containerStorage{
ref: ref,
recentStats: utils.NewTimedStore(maxAge, -1),
maxAge: maxAge,
}
}
type InMemoryStorage struct {
lock sync.RWMutex
containerStorageMap map[string]*containerStorage
maxAge time.Duration
backend storage.StorageDriver
}
func (self *InMemoryStorage) AddStats(ref info.ContainerReference, stats *info.ContainerStats) error {
var cstore *containerStorage
var ok bool
func() {
self.lock.Lock()
defer self.lock.Unlock()
if cstore, ok = self.containerStorageMap[ref.Name]; !ok {
cstore = newContainerStore(ref, self.maxAge)
self.containerStorageMap[ref.Name] = cstore
}
}()
if self.backend != nil {
// TODO(monnand): To deal with long delay write operations, we
// may want to start a pool of goroutines to do write
// operations.
if err := self.backend.AddStats(ref, stats); err != nil {
glog.Error(err)
}
}
return cstore.AddStats(stats)
}
func (self *InMemoryStorage) RecentStats(name string, start, end time.Time, maxStats int) ([]*info.ContainerStats, error) {
var cstore *containerStorage
var ok bool
err := func() error {
self.lock.RLock()
defer self.lock.RUnlock()
if cstore, ok = self.containerStorageMap[name]; !ok {
return fmt.Errorf("unable to find data for container %v", name)
}
return nil
}()
if err != nil {
return nil, err
}
return cstore.RecentStats(start, end, maxStats)
}
func (self *InMemoryStorage) Close() error {
self.lock.Lock()
self.containerStorageMap = make(map[string]*containerStorage, 32)
self.lock.Unlock()
return nil
}
func New(
maxAge time.Duration,
backend storage.StorageDriver,
) *InMemoryStorage {
ret := &InMemoryStorage{
containerStorageMap: make(map[string]*containerStorage, 32),
maxAge: maxAge,
backend: backend,
}
return ret
}