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events.go
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events.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"os"
"sync"
"time"
"github.com/opencontainers/runc/libcontainer"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/intelrdt"
"github.com/opencontainers/runc/types"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
var eventsCommand = cli.Command{
Name: "events",
Usage: "display container events such as OOM notifications, cpu, memory, and IO usage statistics",
ArgsUsage: `<container-id>
Where "<container-id>" is the name for the instance of the container.`,
Description: `The events command displays information about the container. By default the
information is displayed once every 5 seconds.`,
Flags: []cli.Flag{
cli.DurationFlag{Name: "interval", Value: 5 * time.Second, Usage: "set the stats collection interval"},
cli.BoolFlag{Name: "stats", Usage: "display the container's stats then exit"},
},
Action: func(context *cli.Context) error {
if err := checkArgs(context, 1, exactArgs); err != nil {
return err
}
container, err := getContainer(context)
if err != nil {
return err
}
duration := context.Duration("interval")
if duration <= 0 {
return errors.New("duration interval must be greater than 0")
}
status, err := container.Status()
if err != nil {
return err
}
if status == libcontainer.Stopped {
return fmt.Errorf("container with id %s is not running", container.ID())
}
var (
stats = make(chan *libcontainer.Stats, 1)
events = make(chan *types.Event, 1024)
group = &sync.WaitGroup{}
)
group.Add(1)
go func() {
defer group.Done()
enc := json.NewEncoder(os.Stdout)
for e := range events {
if err := enc.Encode(e); err != nil {
logrus.Error(err)
}
}
}()
if context.Bool("stats") {
s, err := container.Stats()
if err != nil {
return err
}
events <- &types.Event{Type: "stats", ID: container.ID(), Data: convertLibcontainerStats(s)}
close(events)
group.Wait()
return nil
}
go func() {
for range time.Tick(context.Duration("interval")) {
s, err := container.Stats()
if err != nil {
logrus.Error(err)
continue
}
stats <- s
}
}()
n, err := container.NotifyOOM()
if err != nil {
return err
}
for {
select {
case _, ok := <-n:
if ok {
// this means an oom event was received, if it is !ok then
// the channel was closed because the container stopped and
// the cgroups no longer exist.
events <- &types.Event{Type: "oom", ID: container.ID()}
} else {
n = nil
}
case s := <-stats:
events <- &types.Event{Type: "stats", ID: container.ID(), Data: convertLibcontainerStats(s)}
}
if n == nil {
close(events)
break
}
}
group.Wait()
return nil
},
}
func convertLibcontainerStats(ls *libcontainer.Stats) *types.Stats {
cg := ls.CgroupStats
if cg == nil {
return nil
}
var s types.Stats
s.Pids.Current = cg.PidsStats.Current
s.Pids.Limit = cg.PidsStats.Limit
s.CPU.Usage.Kernel = cg.CpuStats.CpuUsage.UsageInKernelmode
s.CPU.Usage.User = cg.CpuStats.CpuUsage.UsageInUsermode
s.CPU.Usage.Total = cg.CpuStats.CpuUsage.TotalUsage
s.CPU.Usage.Percpu = cg.CpuStats.CpuUsage.PercpuUsage
s.CPU.Usage.PercpuKernel = cg.CpuStats.CpuUsage.PercpuUsageInKernelmode
s.CPU.Usage.PercpuUser = cg.CpuStats.CpuUsage.PercpuUsageInUsermode
s.CPU.Throttling.Periods = cg.CpuStats.ThrottlingData.Periods
s.CPU.Throttling.ThrottledPeriods = cg.CpuStats.ThrottlingData.ThrottledPeriods
s.CPU.Throttling.ThrottledTime = cg.CpuStats.ThrottlingData.ThrottledTime
s.CPUSet = types.CPUSet(cg.CPUSetStats)
s.Memory.Cache = cg.MemoryStats.Cache
s.Memory.Kernel = convertMemoryEntry(cg.MemoryStats.KernelUsage)
s.Memory.KernelTCP = convertMemoryEntry(cg.MemoryStats.KernelTCPUsage)
s.Memory.Swap = convertMemoryEntry(cg.MemoryStats.SwapUsage)
s.Memory.Usage = convertMemoryEntry(cg.MemoryStats.Usage)
s.Memory.Raw = cg.MemoryStats.Stats
s.Blkio.IoServiceBytesRecursive = convertBlkioEntry(cg.BlkioStats.IoServiceBytesRecursive)
s.Blkio.IoServicedRecursive = convertBlkioEntry(cg.BlkioStats.IoServicedRecursive)
s.Blkio.IoQueuedRecursive = convertBlkioEntry(cg.BlkioStats.IoQueuedRecursive)
s.Blkio.IoServiceTimeRecursive = convertBlkioEntry(cg.BlkioStats.IoServiceTimeRecursive)
s.Blkio.IoWaitTimeRecursive = convertBlkioEntry(cg.BlkioStats.IoWaitTimeRecursive)
s.Blkio.IoMergedRecursive = convertBlkioEntry(cg.BlkioStats.IoMergedRecursive)
s.Blkio.IoTimeRecursive = convertBlkioEntry(cg.BlkioStats.IoTimeRecursive)
s.Blkio.SectorsRecursive = convertBlkioEntry(cg.BlkioStats.SectorsRecursive)
s.Hugetlb = make(map[string]types.Hugetlb)
for k, v := range cg.HugetlbStats {
s.Hugetlb[k] = convertHugtlb(v)
}
if is := ls.IntelRdtStats; is != nil {
if intelrdt.IsCATEnabled() {
s.IntelRdt.L3CacheInfo = convertL3CacheInfo(is.L3CacheInfo)
s.IntelRdt.L3CacheSchemaRoot = is.L3CacheSchemaRoot
s.IntelRdt.L3CacheSchema = is.L3CacheSchema
}
if intelrdt.IsMBAEnabled() {
s.IntelRdt.MemBwInfo = convertMemBwInfo(is.MemBwInfo)
s.IntelRdt.MemBwSchemaRoot = is.MemBwSchemaRoot
s.IntelRdt.MemBwSchema = is.MemBwSchema
}
if intelrdt.IsMBMEnabled() {
s.IntelRdt.MBMStats = is.MBMStats
}
if intelrdt.IsCMTEnabled() {
s.IntelRdt.CMTStats = is.CMTStats
}
}
s.NetworkInterfaces = ls.Interfaces
return &s
}
func convertHugtlb(c cgroups.HugetlbStats) types.Hugetlb {
return types.Hugetlb{
Usage: c.Usage,
Max: c.MaxUsage,
Failcnt: c.Failcnt,
}
}
func convertMemoryEntry(c cgroups.MemoryData) types.MemoryEntry {
return types.MemoryEntry{
Limit: c.Limit,
Usage: c.Usage,
Max: c.MaxUsage,
Failcnt: c.Failcnt,
}
}
func convertBlkioEntry(c []cgroups.BlkioStatEntry) []types.BlkioEntry {
var out []types.BlkioEntry
for _, e := range c {
out = append(out, types.BlkioEntry(e))
}
return out
}
func convertL3CacheInfo(i *intelrdt.L3CacheInfo) *types.L3CacheInfo {
ci := types.L3CacheInfo(*i)
return &ci
}
func convertMemBwInfo(i *intelrdt.MemBwInfo) *types.MemBwInfo {
mi := types.MemBwInfo(*i)
return &mi
}