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factory.go
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factory.go
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// Copyright 2017 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 crio
import (
"fmt"
"path"
"regexp"
"strings"
"github.com/google/cadvisor/container"
"github.com/google/cadvisor/container/libcontainer"
"github.com/google/cadvisor/fs"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/watcher"
"k8s.io/klog/v2"
)
// The namespace under which crio aliases are unique.
const CrioNamespace = "crio"
// Regexp that identifies CRI-O cgroups
var crioCgroupRegexp = regexp.MustCompile(`([a-z0-9]{64})`)
type storageDriver string
const (
// TODO add full set of supported drivers in future..
overlayStorageDriver storageDriver = "overlay"
overlay2StorageDriver storageDriver = "overlay2"
)
type crioFactory struct {
machineInfoFactory info.MachineInfoFactory
storageDriver storageDriver
storageDir string
// Information about the mounted cgroup subsystems.
cgroupSubsystems libcontainer.CgroupSubsystems
// Information about mounted filesystems.
fsInfo fs.FsInfo
includedMetrics container.MetricSet
client CrioClient
}
func (f *crioFactory) String() string {
return CrioNamespace
}
func (f *crioFactory) NewContainerHandler(name string, inHostNamespace bool) (handler container.ContainerHandler, err error) {
client, err := Client()
if err != nil {
return
}
// TODO are there any env vars we need to white list, if so, do it here...
metadataEnvs := []string{}
handler, err = newCrioContainerHandler(
client,
name,
f.machineInfoFactory,
f.fsInfo,
f.storageDriver,
f.storageDir,
&f.cgroupSubsystems,
inHostNamespace,
metadataEnvs,
f.includedMetrics,
)
return
}
// Returns the CRIO ID from the full container name.
func ContainerNameToCrioId(name string) string {
id := path.Base(name)
if matches := crioCgroupRegexp.FindStringSubmatch(id); matches != nil {
return matches[1]
}
return id
}
// isContainerName returns true if the cgroup with associated name
// corresponds to a crio container.
func isContainerName(name string) bool {
// always ignore .mount cgroup even if associated with crio and delegate to systemd
if strings.HasSuffix(name, ".mount") {
return false
}
return crioCgroupRegexp.MatchString(path.Base(name))
}
// crio handles all containers under /crio
func (f *crioFactory) CanHandleAndAccept(name string) (bool, bool, error) {
if strings.HasPrefix(path.Base(name), "crio-conmon") {
// TODO(runcom): should we include crio-conmon cgroups?
return false, false, nil
}
if !strings.HasPrefix(path.Base(name), CrioNamespace) {
return false, false, nil
}
// if the container is not associated with CRI-O, we can't handle it or accept it.
if !isContainerName(name) {
return false, false, nil
}
return true, true, nil
}
func (f *crioFactory) DebugInfo() map[string][]string {
return map[string][]string{}
}
// Register root container before running this function!
func Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo, includedMetrics container.MetricSet) error {
client, err := Client()
if err != nil {
return err
}
info, err := client.Info()
if err != nil {
return err
}
// TODO determine crio version so we can work differently w/ future versions if needed
cgroupSubsystems, err := libcontainer.GetCgroupSubsystems(includedMetrics)
if err != nil {
return fmt.Errorf("failed to get cgroup subsystems: %v", err)
}
klog.V(1).Infof("Registering CRI-O factory")
f := &crioFactory{
client: client,
cgroupSubsystems: cgroupSubsystems,
fsInfo: fsInfo,
machineInfoFactory: factory,
storageDriver: storageDriver(info.StorageDriver),
storageDir: info.StorageRoot,
includedMetrics: includedMetrics,
}
container.RegisterContainerHandlerFactory(f, []watcher.ContainerWatchSource{watcher.Raw})
return nil
}