9b5b221a57
is configurable via a flag and is set to 60 seconds by default. The storage driver test code has been refactored a bit to help test the new buffering feature and will be future proof. Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
74 lines
2.6 KiB
Go
74 lines
2.6 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cache
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import (
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"github.com/google/cadvisor/info"
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"github.com/google/cadvisor/storage"
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"github.com/google/cadvisor/storage/memory"
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)
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type cachedStorageDriver struct {
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maxNumStatsInCache int
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maxNumSamplesInCache int
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cache storage.StorageDriver
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backend storage.StorageDriver
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}
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func (self *cachedStorageDriver) AddStats(ref info.ContainerReference, stats *info.ContainerStats) error {
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err := self.cache.AddStats(ref, stats)
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if err != nil {
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return err
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}
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err = self.backend.AddStats(ref, stats)
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if err != nil {
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return err
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}
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return nil
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}
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func (self *cachedStorageDriver) RecentStats(containerName string, numStats int) ([]*info.ContainerStats, error) {
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if numStats <= self.maxNumStatsInCache {
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return self.cache.RecentStats(containerName, numStats)
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}
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return self.backend.RecentStats(containerName, numStats)
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}
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func (self *cachedStorageDriver) Percentiles(containerName string, cpuUsagePercentiles []int, memUsagePercentiles []int) (*info.ContainerStatsPercentiles, error) {
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return self.backend.Percentiles(containerName, cpuUsagePercentiles, memUsagePercentiles)
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}
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func (self *cachedStorageDriver) Samples(containerName string, numSamples int) ([]*info.ContainerStatsSample, error) {
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if numSamples <= self.maxNumSamplesInCache {
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return self.cache.Samples(containerName, numSamples)
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}
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return self.backend.Samples(containerName, numSamples)
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}
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func (self *cachedStorageDriver) Close() error {
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self.cache.Close()
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return self.backend.Close()
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}
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// TODO(vishh): Cache all samples for a given duration and do not cap the maximum number of samples. This is useful if we happen to change the housekeeping duration.
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func MemoryCache(maxNumSamplesInCache, maxNumStatsInCache int, driver storage.StorageDriver) storage.StorageDriver {
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return &cachedStorageDriver{
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maxNumStatsInCache: maxNumStatsInCache,
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maxNumSamplesInCache: maxNumSamplesInCache,
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cache: memory.New(maxNumSamplesInCache, maxNumStatsInCache),
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backend: driver,
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}
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}
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