e3ab15417c
This adds an Exists() interface to detect when the container is dead. Before reporting an update error we check is Exists() is true. Some documentation was added as well.
99 lines
2.8 KiB
Go
99 lines
2.8 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package raw
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import (
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"fmt"
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"github.com/docker/libcontainer/cgroups"
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"github.com/golang/glog"
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"github.com/google/cadvisor/container"
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"github.com/google/cadvisor/info"
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)
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type cgroupSubsystems struct {
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// Cgroup subsystem mounts.
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// e.g.: "/sys/fs/cgroup/cpu" -> ["cpu", "cpuacct"]
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mounts []cgroups.Mount
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// Cgroup subsystem to their mount location.
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// e.g.: "cpu" -> "/sys/fs/cgroup/cpu"
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mountPoints map[string]string
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}
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type rawFactory struct {
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// Factory for machine information.
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machineInfoFactory info.MachineInfoFactory
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cgroupSubsystems *cgroupSubsystems
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}
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func (self *rawFactory) String() string {
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return "raw"
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}
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func (self *rawFactory) NewContainerHandler(name string) (container.ContainerHandler, error) {
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return newRawContainerHandler(name, self.cgroupSubsystems, self.machineInfoFactory)
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}
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// The raw factory can handle any container.
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func (self *rawFactory) CanHandle(name string) (bool, error) {
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return true, nil
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}
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func Register(machineInfoFactory info.MachineInfoFactory) error {
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// Get all cgroup mounts.
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allCgroups, err := cgroups.GetCgroupMounts()
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if err != nil {
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return err
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}
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if len(allCgroups) == 0 {
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return fmt.Errorf("failed to find cgroup mounts for the raw factory")
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}
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// Trim the mounts to only the subsystems we care about.
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supportedCgroups := make([]cgroups.Mount, 0, len(allCgroups))
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mountPoints := make(map[string]string, len(allCgroups))
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for _, mount := range allCgroups {
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for _, subsystem := range mount.Subsystems {
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if _, ok := supportedSubsystems[subsystem]; ok {
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supportedCgroups = append(supportedCgroups, mount)
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mountPoints[subsystem] = mount.Mountpoint
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}
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}
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}
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if len(supportedCgroups) == 0 {
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return fmt.Errorf("failed to find supported cgroup mounts for the raw factory")
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}
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glog.Infof("Registering Raw factory")
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factory := &rawFactory{
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machineInfoFactory: machineInfoFactory,
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cgroupSubsystems: &cgroupSubsystems{
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mounts: supportedCgroups,
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mountPoints: mountPoints,
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},
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}
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container.RegisterContainerHandlerFactory(factory)
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return nil
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}
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// Cgroup subsystems we support listing (should be the minimal set we need stats from).
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var supportedSubsystems map[string]struct{} = map[string]struct{}{
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"cpu": {},
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"cpuacct": {},
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"memory": {},
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"cpuset": {},
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}
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