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// Copyright 2018 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package memory
import (
"io/ioutil"
"strconv"
"strings"
"github.com/shirou/gopsutil/mem"
)
// MemTotal returns the total amount of RAM on this system
var MemTotal func() (uint64, error)
// MemUsed returns the total used amount of RAM on this system
var MemUsed func() (uint64, error)
// MemTotalNormal returns the total amount of RAM on this system in non-container environment.
func MemTotalNormal() (uint64, error) {
v, err := mem.VirtualMemory()
return v.Total, err
}
// MemUsedNormal returns the total used amount of RAM on this system in non-container environment.
func MemUsedNormal() (uint64, error) {
v, err := mem.VirtualMemory()
return v.Used, err
}
const (
cGroupMemLimitPath = "/sys/fs/cgroup/memory/memory.limit_in_bytes"
cGroupMemUsagePath = "/sys/fs/cgroup/memory/memory.usage_in_bytes"
selfCGroupPath = "/proc/self/cgroup"
)
// MemTotalCGroup returns the total amount of RAM on this system in container environment.
func MemTotalCGroup() (uint64, error) {
return readUint(cGroupMemLimitPath)
}
// MemUsedCGroup returns the total used amount of RAM on this system in container environment.
func MemUsedCGroup() (uint64, error) {
return readUint(cGroupMemUsagePath)
}
func init() {
if inContainer() {
MemTotal = MemTotalCGroup
MemUsed = MemUsedCGroup
} else {
MemTotal = MemTotalNormal
MemUsed = MemUsedNormal
}
}
func inContainer() bool {
v, err := ioutil.ReadFile(selfCGroupPath)
if err != nil {
return false
}
if strings.Contains(string(v), "docker") ||
strings.Contains(string(v), "kubepods") ||
strings.Contains(string(v), "containerd") {
return true
}
return false
}
// refer to https://github.com/containerd/cgroups/blob/318312a373405e5e91134d8063d04d59768a1bff/utils.go#L251
func parseUint(s string, base, bitSize int) (uint64, error) {
v, err := strconv.ParseUint(s, base, bitSize)
if err != nil {
intValue, intErr := strconv.ParseInt(s, base, bitSize)
// 1. Handle negative values greater than MinInt64 (and)
// 2. Handle negative values lesser than MinInt64
if intErr == nil && intValue < 0 {
return 0, nil
} else if intErr != nil &&
intErr.(*strconv.NumError).Err == strconv.ErrRange &&
intValue < 0 {
return 0, nil
}
return 0, err
}
return v, nil
}
// refer to https://github.com/containerd/cgroups/blob/318312a373405e5e91134d8063d04d59768a1bff/utils.go#L243
func readUint(path string) (uint64, error) {
v, err := ioutil.ReadFile(path)
if err != nil {
return 0, err
}
return parseUint(strings.TrimSpace(string(v)), 10, 64)
}