forked from aws/amazon-ecs-agent
/
utils.go
73 lines (63 loc) · 2.31 KB
/
utils.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
// Copyright 2014-2015 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 (
"math"
"regexp"
"time"
"github.com/docker/libcontainer"
)
// 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"
// nan32 returns a 32bit NaN.
func nan32() float32 {
return (float32)(math.NaN())
}
// toContainerStats returns a new object of the ContainerStats object from libcontainer stats.
func toContainerStats(containerStats libcontainer.ContainerStats) *ContainerStats {
// The length of PercpuUsage represents the number of cores in an instance.
numCores := uint64(len(containerStats.CgroupStats.CpuStats.CpuUsage.PercpuUsage))
cpuUsage := uint64(0)
if numCores > 0 {
cpuUsage = containerStats.CgroupStats.CpuStats.CpuUsage.TotalUsage / numCores
}
return &ContainerStats{
cpuUsage: cpuUsage,
memoryUsage: containerStats.CgroupStats.MemoryStats.Usage,
timestamp: time.Now(),
}
}
// createContainerStats returns a new object of the ContainerStats object.
func createContainerStats(cpuTime uint64, memBytes uint64, ts time.Time) *ContainerStats {
return &ContainerStats{
cpuUsage: cpuTime,
memoryUsage: memBytes,
timestamp: ts,
}
}
// 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 {
log.Debug("Error matching string", "err", mErr)
return false
}
return matched
}