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utils.go
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utils.go
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// Copyright 2014-2016 Amazon.com, Inc. or its affiliates. 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. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 stats
import (
"fmt"
"math"
"regexp"
"runtime"
"time"
"github.com/cihub/seelog"
docker "github.com/fsouza/go-dockerclient"
)
// networkStatsErrorPattern defines the pattern that is used to evaluate
// if there's an error reading network stats.
const networkStatsErrorPattern = "open /sys/class/net/veth.*: no such file or directory"
var numCores = uint64(runtime.NumCPU())
// nan32 returns a 32bit NaN.
func nan32() float32 {
return (float32)(math.NaN())
}
// dockerStatsToContainerStats returns a new object of the ContainerStats object from docker stats.
func dockerStatsToContainerStats(dockerStats *docker.Stats) (*ContainerStats, error) {
// The length of PercpuUsage represents the number of cores in an instance.
if len(dockerStats.CPUStats.CPUUsage.PercpuUsage) == 0 {
seelog.Debug("Invalid container statistics reported, invalid stats payload from docker")
return nil, fmt.Errorf("Invalid container statistics reported")
}
cpuUsage := dockerStats.CPUStats.CPUUsage.TotalUsage / numCores
return &ContainerStats{
cpuUsage: cpuUsage,
memoryUsage: dockerStats.MemoryStats.Usage,
timestamp: dockerStats.Read,
}, nil
}
// parseNanoTime returns the time object from a string formatted with RFC3339Nano layout.
func parseNanoTime(value string) time.Time {
ts, _ := time.Parse(time.RFC3339Nano, value)
return ts
}
// isNetworkStatsError returns if the error indicates that files in /sys/class/net
// could not be opened.
func isNetworkStatsError(err error) bool {
matched, mErr := regexp.MatchString(networkStatsErrorPattern, err.Error())
if mErr != nil {
seelog.Debugf("Error matching string: %v", mErr)
return false
}
return matched
}