forked from google/cadvisor
/
helpers.go
224 lines (192 loc) · 5.97 KB
/
helpers.go
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// Copyright 2016 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 common
import (
"fmt"
"io/ioutil"
"os"
"path"
"strconv"
"strings"
"time"
"github.com/google/cadvisor/container"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/utils"
"github.com/golang/glog"
)
func DebugInfo(watches map[string][]string) map[string][]string {
out := make(map[string][]string)
lines := make([]string, 0, len(watches))
for containerName, cgroupWatches := range watches {
lines = append(lines, fmt.Sprintf("%s:", containerName))
for _, cg := range cgroupWatches {
lines = append(lines, fmt.Sprintf("\t%s", cg))
}
}
out["Inotify watches"] = lines
return out
}
func GetSpec(cgroupPaths map[string]string, machineInfoFactory info.MachineInfoFactory, hasNetwork, hasFilesystem bool) (info.ContainerSpec, error) {
var spec info.ContainerSpec
// Assume unified hierarchy containers.
// Get the lowest creation time from all hierarchies as the container creation time.
now := time.Now()
lowestTime := now
for _, cgroupPath := range cgroupPaths {
// The modified time of the cgroup directory changes whenever a subcontainer is created.
// eg. /docker will have creation time matching the creation of latest docker container.
// Use clone_children as a workaround as it isn't usually modified. It is only likely changed
// immediately after creating a container.
cgroupPath = path.Join(cgroupPath, "cgroup.clone_children")
fi, err := os.Stat(cgroupPath)
if err == nil && fi.ModTime().Before(lowestTime) {
lowestTime = fi.ModTime()
}
}
if lowestTime != now {
spec.CreationTime = lowestTime
}
// Get machine info.
mi, err := machineInfoFactory.GetMachineInfo()
if err != nil {
return spec, err
}
// CPU.
cpuRoot, ok := cgroupPaths["cpu"]
if ok {
if utils.FileExists(cpuRoot) {
spec.HasCpu = true
spec.Cpu.Limit = readUInt64(cpuRoot, "cpu.shares")
spec.Cpu.Period = readUInt64(cpuRoot, "cpu.cfs_period_us")
quota := readString(cpuRoot, "cpu.cfs_quota_us")
if quota != "" && quota != "-1" {
val, err := strconv.ParseUint(quota, 10, 64)
if err != nil {
glog.Errorf("GetSpec: Failed to parse CPUQuota from %q: %s", path.Join(cpuRoot, "cpu.cfs_quota_us"), err)
}
spec.Cpu.Quota = val
}
}
}
// Cpu Mask.
// This will fail for non-unified hierarchies. We'll return the whole machine mask in that case.
cpusetRoot, ok := cgroupPaths["cpuset"]
if ok {
if utils.FileExists(cpusetRoot) {
spec.HasCpu = true
mask := readString(cpusetRoot, "cpuset.cpus")
spec.Cpu.Mask = utils.FixCpuMask(mask, mi.NumCores)
}
}
// Memory
memoryRoot, ok := cgroupPaths["memory"]
if ok {
if utils.FileExists(memoryRoot) {
spec.HasMemory = true
spec.Memory.Limit = readUInt64(memoryRoot, "memory.limit_in_bytes")
spec.Memory.SwapLimit = readUInt64(memoryRoot, "memory.memsw.limit_in_bytes")
}
}
spec.HasNetwork = hasNetwork
spec.HasFilesystem = hasFilesystem
if blkioRoot, ok := cgroupPaths["blkio"]; ok && utils.FileExists(blkioRoot) {
spec.HasDiskIo = true
}
return spec, nil
}
func readString(dirpath string, file string) string {
cgroupFile := path.Join(dirpath, file)
// Ignore non-existent files
if !utils.FileExists(cgroupFile) {
return ""
}
// Read
out, err := ioutil.ReadFile(cgroupFile)
if err != nil {
glog.Errorf("readString: Failed to read %q: %s", cgroupFile, err)
return ""
}
return strings.TrimSpace(string(out))
}
func readUInt64(dirpath string, file string) uint64 {
out := readString(dirpath, file)
if out == "" {
return 0
}
val, err := strconv.ParseUint(out, 10, 64)
if err != nil {
glog.Errorf("readUInt64: Failed to parse int %q from file %q: %s", out, path.Join(dirpath, file), err)
return 0
}
return val
}
// Lists all directories under "path" and outputs the results as children of "parent".
func ListDirectories(dirpath string, parent string, recursive bool, output map[string]struct{}) error {
// Ignore if this hierarchy does not exist.
if !utils.FileExists(dirpath) {
return nil
}
entries, err := ioutil.ReadDir(dirpath)
if err != nil {
return err
}
for _, entry := range entries {
// We only grab directories.
if entry.IsDir() {
name := path.Join(parent, entry.Name())
output[name] = struct{}{}
// List subcontainers if asked to.
if recursive {
err := ListDirectories(path.Join(dirpath, entry.Name()), name, true, output)
if err != nil {
return err
}
}
}
}
return nil
}
func MakeCgroupPaths(mountPoints map[string]string, name string) map[string]string {
cgroupPaths := make(map[string]string, len(mountPoints))
for key, val := range mountPoints {
cgroupPaths[key] = path.Join(val, name)
}
return cgroupPaths
}
func CgroupExists(cgroupPaths map[string]string) bool {
// If any cgroup exists, the container is still alive.
for _, cgroupPath := range cgroupPaths {
if utils.FileExists(cgroupPath) {
return true
}
}
return false
}
func ListContainers(name string, cgroupPaths map[string]string, listType container.ListType) ([]info.ContainerReference, error) {
containers := make(map[string]struct{})
for _, cgroupPath := range cgroupPaths {
err := ListDirectories(cgroupPath, name, listType == container.ListRecursive, containers)
if err != nil {
return nil, err
}
}
// Make into container references.
ret := make([]info.ContainerReference, 0, len(containers))
for cont := range containers {
ret = append(ret, info.ContainerReference{
Name: cont,
})
}
return ret, nil
}