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plugin.go
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plugin.go
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// Copyright 2021 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 podman
import (
"fmt"
"github.com/opencontainers/runc/libcontainer/cgroups"
"k8s.io/klog/v2"
"github.com/google/cadvisor/container"
"github.com/google/cadvisor/container/docker"
dockerutil "github.com/google/cadvisor/container/docker/utils"
"github.com/google/cadvisor/container/libcontainer"
"github.com/google/cadvisor/devicemapper"
"github.com/google/cadvisor/fs"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/watcher"
"github.com/google/cadvisor/zfs"
)
func NewPlugin() container.Plugin {
return &plugin{}
}
type plugin struct{}
func (p *plugin) InitializeFSContext(context *fs.Context) error {
context.Podman = fs.PodmanContext{
Root: "",
Driver: "",
DriverStatus: map[string]string{},
}
return nil
}
func (p *plugin) Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo, includedMetrics container.MetricSet) (watcher.ContainerWatcher, error) {
return Register(factory, fsInfo, includedMetrics)
}
func Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo, metrics container.MetricSet) (watcher.ContainerWatcher, error) {
cgroupSubsystem, err := libcontainer.GetCgroupSubsystems(metrics)
if err != nil {
return nil, fmt.Errorf("failed to get cgroup subsystems: %v", err)
}
validatedInfo, err := docker.ValidateInfo(GetInfo, VersionString)
if err != nil {
return nil, fmt.Errorf("failed to validate Podman info: %v", err)
}
var (
thinPoolName string
thinPoolWatcher *devicemapper.ThinPoolWatcher
zfsWatcher *zfs.ZfsWatcher
)
if metrics.Has(container.DiskUsageMetrics) {
switch docker.StorageDriver(validatedInfo.Driver) {
case docker.DevicemapperStorageDriver:
thinPoolWatcher, err = docker.StartThinPoolWatcher(validatedInfo)
if err != nil {
klog.Errorf("devicemapper filesystem stats will not be reported: %v", err)
}
status, _ := docker.StatusFromDockerInfo(*validatedInfo)
thinPoolName = status.DriverStatus[dockerutil.DriverStatusPoolName]
case docker.ZfsStorageDriver:
zfsWatcher, err = docker.StartZfsWatcher(validatedInfo)
if err != nil {
klog.Errorf("zfs filesystem stats will not be reported: %v", err)
}
}
}
// Register Podman container handler factory.
klog.V(1).Info("Registering Podman factory")
f := &podmanFactory{
machineInfoFactory: factory,
storageDriver: docker.StorageDriver(validatedInfo.Driver),
storageDir: RootDir(),
cgroupSubsystem: cgroupSubsystem,
fsInfo: fsInfo,
metrics: metrics,
thinPoolName: thinPoolName,
thinPoolWatcher: thinPoolWatcher,
zfsWatcher: zfsWatcher,
}
container.RegisterContainerHandlerFactory(f, []watcher.ContainerWatchSource{watcher.Raw})
if !cgroups.IsCgroup2UnifiedMode() {
klog.Warning("Podman rootless containers not working with cgroups v1!")
}
return nil, nil
}