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package daemon
import (
"context"
"errors"
"fmt"
"time"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/go-units"
)
// ContainerTop handles `docker top` client requests.
// Future considerations:
// -- Windows users are far more familiar with CPU% total.
// Further, users on Windows rarely see user/kernel CPU stats split.
// The kernel returns everything in terms of 100ns. To obtain
// CPU%, we could do something like docker stats does which takes two
// samples, subtract the difference and do the maths. Unfortunately this
// would slow the stat call down and require two kernel calls. So instead,
// we do something similar to linux and display the CPU as combined HH:MM:SS.mmm.
// -- Perhaps we could add an argument to display "raw" stats
// -- "Memory" is an extremely overloaded term in Windows. Hence we do what
// task manager does and use the private working set as the memory counter.
// We could return more info for those who really understand how memory
// management works in Windows if we introduced a "raw" stats (above).
func (daemon *Daemon) ContainerTop(name string, psArgs string) (*containertypes.ContainerTopOKBody, error) {
// It's not at all an equivalent to linux 'ps' on Windows
if psArgs != "" {
return nil, errors.New("Windows does not support arguments to top")
}
container, err := daemon.GetContainer(name)
if err != nil {
return nil, err
}
if !container.IsRunning() {
return nil, errNotRunning(container.ID)
}
if container.IsRestarting() {
return nil, errContainerIsRestarting(container.ID)
}
s, err := daemon.containerd.Summary(context.Background(), container.ID)
if err != nil {
return nil, err
}
procList := &containertypes.ContainerTopOKBody{}
procList.Titles = []string{"Name", "PID", "CPU", "Private Working Set"}
for _, j := range s {
d := time.Duration((j.KernelTime100ns + j.UserTime100ns) * 100) // Combined time in nanoseconds
procList.Processes = append(procList.Processes, []string{
j.ImageName,
fmt.Sprint(j.ProcessId),
fmt.Sprintf("%02d:%02d:%02d.%03d", int(d.Hours()), int(d.Minutes())%60, int(d.Seconds())%60, int(d.Nanoseconds()/1000000)%1000),
units.HumanSize(float64(j.MemoryWorkingSetPrivateBytes))})
}
return procList, nil
}
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