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moby--moby/pkg/cgroups/fs/freezer.go
Michael Crosby bce49dff0d Add freezer stats
This one is a problem because the most useful stat is a string and not a
float like verything else.  We may have to change the return type
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
2014-04-20 18:35:33 -07:00

62 lines
1.2 KiB
Go

package fs
import (
"fmt"
"github.com/dotcloud/docker/pkg/cgroups"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
)
type freezerGroup struct {
}
func (s *freezerGroup) Set(d *data) error {
// we just want to join this group even though we don't set anything
if _, err := d.join("freezer"); err != nil && err != cgroups.ErrNotFound {
return err
}
return nil
}
func (s *freezerGroup) Remove(d *data) error {
return removePath(d.path("freezer"))
}
func (s *freezerGroup) Stats(d *data) (map[string]float64, error) {
var (
paramData = make(map[string]float64)
params = []string{
"parent_freezing",
"self_freezing",
// comment out right now because this is string "state",
}
)
path, err := d.path("freezer")
if err != nil {
return nil, err
}
for _, param := range params {
f, err := os.Open(filepath.Join(path, fmt.Sprintf("freezer.%s", param)))
if err != nil {
return nil, err
}
defer f.Close()
data, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
v, err := strconv.ParseFloat(strings.TrimSuffix(string(data), "\n"), 64)
if err != nil {
return nil, err
}
paramData[param] = v
}
return paramData, nil
}