mirror of https://github.com/docker/docs.git
41 lines
1.0 KiB
Go
41 lines
1.0 KiB
Go
package fs
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"path/filepath"
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"strconv"
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"strings"
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)
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var (
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ErrNotSupportStat = errors.New("stats are not supported for subsystem")
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ErrNotValidFormat = errors.New("line is not a valid key value format")
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)
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// Parses a cgroup param and returns as name, value
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// i.e. "io_service_bytes 1234" will return as io_service_bytes, 1234
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func getCgroupParamKeyValue(t string) (string, float64, error) {
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parts := strings.Fields(t)
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switch len(parts) {
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case 2:
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value, err := strconv.ParseFloat(parts[1], 64)
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if err != nil {
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return "", 0.0, fmt.Errorf("Unable to convert param value to float: %s", err)
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}
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return parts[0], value, nil
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default:
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return "", 0.0, ErrNotValidFormat
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}
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}
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// Gets a single float64 value from the specified cgroup file.
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func getCgroupParamFloat64(cgroupPath, cgroupFile string) (float64, error) {
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contents, err := ioutil.ReadFile(filepath.Join(cgroupPath, cgroupFile))
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if err != nil {
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return -1.0, err
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}
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return strconv.ParseFloat(strings.TrimSpace(string(contents)), 64)
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}
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