mirror of https://github.com/k3s-io/k3s
135 lines
3.5 KiB
Go
135 lines
3.5 KiB
Go
// +build cgo,linux
|
|
|
|
/*
|
|
Copyright 2015 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 cadvisor
|
|
|
|
import (
|
|
"fmt"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
|
|
"github.com/golang/glog"
|
|
cadvisorFs "github.com/google/cadvisor/fs"
|
|
cadvisorHttp "github.com/google/cadvisor/http"
|
|
cadvisorApi "github.com/google/cadvisor/info/v1"
|
|
cadvisorApiV2 "github.com/google/cadvisor/info/v2"
|
|
"github.com/google/cadvisor/manager"
|
|
"github.com/google/cadvisor/storage/memory"
|
|
"github.com/google/cadvisor/utils/sysfs"
|
|
)
|
|
|
|
type cadvisorClient struct {
|
|
manager.Manager
|
|
}
|
|
|
|
var _ Interface = new(cadvisorClient)
|
|
|
|
// TODO(vmarmol): Make configurable.
|
|
// The number of stats to keep in memory.
|
|
const statsToCache = 60
|
|
|
|
// Creates a cAdvisor and exports its API on the specified port if port > 0.
|
|
func New(port uint) (Interface, error) {
|
|
sysFs, err := sysfs.NewRealSysFs()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Create and start the cAdvisor container manager.
|
|
m, err := manager.New(memory.New(statsToCache, nil), sysFs)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = m.Start()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
cadvisorClient := &cadvisorClient{
|
|
Manager: m,
|
|
}
|
|
|
|
// Export the HTTP endpoint if a port was specified.
|
|
if port > 0 {
|
|
err = cadvisorClient.exportHTTP(port)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return cadvisorClient, nil
|
|
}
|
|
|
|
func (self *cadvisorClient) exportHTTP(port uint) error {
|
|
mux := http.NewServeMux()
|
|
err := cadvisorHttp.RegisterHandlers(mux, self, "", "", "", "", "/metrics")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
serv := &http.Server{
|
|
Addr: fmt.Sprintf(":%d", port),
|
|
Handler: mux,
|
|
}
|
|
|
|
// TODO(vmarmol): Remove this when the cAdvisor port is once again free.
|
|
// If export failed, retry in the background until we are able to bind.
|
|
// This allows an existing cAdvisor to be killed before this one registers.
|
|
go func() {
|
|
defer util.HandleCrash()
|
|
|
|
err := serv.ListenAndServe()
|
|
for err != nil {
|
|
glog.Infof("Failed to register cAdvisor on port %d, retrying. Error: %v", port, err)
|
|
time.Sleep(time.Minute)
|
|
err = serv.ListenAndServe()
|
|
}
|
|
}()
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *cadvisorClient) ContainerInfo(name string, req *cadvisorApi.ContainerInfoRequest) (*cadvisorApi.ContainerInfo, error) {
|
|
return self.GetContainerInfo(name, req)
|
|
}
|
|
|
|
func (self *cadvisorClient) VersionInfo() (*cadvisorApi.VersionInfo, error) {
|
|
return self.GetVersionInfo()
|
|
}
|
|
|
|
func (self *cadvisorClient) MachineInfo() (*cadvisorApi.MachineInfo, error) {
|
|
return self.GetMachineInfo()
|
|
}
|
|
|
|
func (self *cadvisorClient) DockerImagesFsInfo() (cadvisorApiV2.FsInfo, error) {
|
|
res, err := self.GetFsInfo(cadvisorFs.LabelDockerImages)
|
|
if err != nil {
|
|
return cadvisorApiV2.FsInfo{}, err
|
|
}
|
|
if len(res) == 0 {
|
|
return cadvisorApiV2.FsInfo{}, fmt.Errorf("failed to find information for the filesystem containing Docker images")
|
|
}
|
|
// TODO(vmarmol): Handle this better when Docker has more than one image filesystem.
|
|
if len(res) > 1 {
|
|
glog.Warningf("More than one Docker images filesystem: %#v. Only using the first one", res)
|
|
}
|
|
|
|
return res[0], nil
|
|
}
|