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// +build linux
package libpod
import (
"strconv"
"strings"
"github.com/containers/psgo"
"github.com/pkg/errors"
)
// Top gathers statistics about the running processes in a container. It returns a
// []string for output
func (c *Container) Top(descriptors []string) ([]string, error) {
conStat, err := c.State()
if err != nil {
return nil, errors.Wrapf(err, "unable to look up state for %s", c.ID())
}
if conStat != ContainerStateRunning {
return nil, errors.Errorf("top can only be used on running containers")
}
return c.GetContainerPidInformation(descriptors)
}
// GetContainerPidInformation returns process-related data of all processes in
// the container. The output data can be controlled via the `descriptors`
// argument which expects format descriptors and supports all AIXformat
// descriptors of ps (1) plus some additional ones to for instance inspect the
// set of effective capabilities. Eeach element in the returned string slice
// is a tab-separated string.
//
// For more details, please refer to github.com/containers/psgo.
func (c *Container) GetContainerPidInformation(descriptors []string) ([]string, error) {
pid := strconv.Itoa(c.state.PID)
// TODO: psgo returns a [][]string to give users the ability to apply
// filters on the data. We need to change the API here and the
// varlink API to return a [][]string if we want to make use of
// filtering.
psgoOutput, err := psgo.JoinNamespaceAndProcessInfo(pid, descriptors)
if err != nil {
return nil, err
}
res := []string{}
for _, out := range psgoOutput {
res = append(res, strings.Join(out, "\t"))
}
return res, nil
}
// GetContainerPidInformationDescriptors returns a string slice of all supported
// format descriptors of GetContainerPidInformation.
func GetContainerPidInformationDescriptors() ([]string, error) {
return psgo.ListDescriptors(), nil
}
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