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|
package compat
import (
"encoding/json"
"net/http"
"time"
"github.com/containers/podman/v2/libpod"
"github.com/containers/podman/v2/libpod/define"
"github.com/containers/podman/v2/pkg/api/handlers/utils"
"github.com/containers/podman/v2/pkg/cgroups"
docker "github.com/docker/docker/api/types"
"github.com/gorilla/schema"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const DefaultStatsPeriod = 5 * time.Second
func StatsContainer(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value("runtime").(*libpod.Runtime)
decoder := r.Context().Value("decoder").(*schema.Decoder)
query := struct {
Stream bool `schema:"stream"`
}{
Stream: true,
}
if err := decoder.Decode(&query, r.URL.Query()); err != nil {
utils.Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "Failed to parse parameters for %s", r.URL.String()))
return
}
name := utils.GetName(r)
ctnr, err := runtime.LookupContainer(name)
if err != nil {
utils.ContainerNotFound(w, name, err)
return
}
// If the container isn't running, then let's not bother and return
// immediately.
state, err := ctnr.State()
if err != nil {
utils.InternalServerError(w, err)
return
}
if state != define.ContainerStateRunning {
utils.Error(w, "Container not running and streaming requested", http.StatusConflict, define.ErrCtrStateInvalid)
return
}
stats, err := ctnr.GetContainerStats(&define.ContainerStats{})
if err != nil {
utils.InternalServerError(w, errors.Wrapf(err, "Failed to obtain Container %s stats", name))
return
}
var preRead time.Time
var preCPUStats CPUStats
if query.Stream {
preRead = time.Now()
systemUsage, _ := cgroups.GetSystemCPUUsage()
preCPUStats = CPUStats{
CPUUsage: docker.CPUUsage{
TotalUsage: stats.CPUNano,
PercpuUsage: stats.PerCPU,
UsageInKernelmode: stats.CPUSystemNano,
UsageInUsermode: stats.CPUNano - stats.CPUSystemNano,
},
CPU: stats.CPU,
SystemUsage: systemUsage,
OnlineCPUs: 0,
ThrottlingData: docker.ThrottlingData{},
}
}
// Write header and content type.
w.WriteHeader(http.StatusOK)
w.Header().Add("Content-Type", "application/json")
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
// Setup JSON encoder for streaming.
coder := json.NewEncoder(w)
coder.SetEscapeHTML(true)
streamLabel: // A label to flatten the scope
select {
case <-r.Context().Done():
logrus.Debugf("Client connection (container stats) cancelled")
default:
// Container stats
stats, err := ctnr.GetContainerStats(stats)
if err != nil {
logrus.Errorf("Unable to get container stats: %v", err)
return
}
inspect, err := ctnr.Inspect(false)
if err != nil {
logrus.Errorf("Unable to inspect container: %v", err)
return
}
// Cgroup stats
cgroupPath, err := ctnr.CGroupPath()
if err != nil {
logrus.Errorf("Unable to get cgroup path of container: %v", err)
return
}
cgroup, err := cgroups.Load(cgroupPath)
if err != nil {
logrus.Errorf("Unable to load cgroup: %v", err)
return
}
cgroupStat, err := cgroup.Stat()
if err != nil {
logrus.Errorf("Unable to get cgroup stats: %v", err)
return
}
// FIXME: network inspection does not yet work entirely
net := make(map[string]docker.NetworkStats)
networkName := inspect.NetworkSettings.EndpointID
if networkName == "" {
networkName = "network"
}
net[networkName] = docker.NetworkStats{
RxBytes: stats.NetInput,
RxPackets: 0,
RxErrors: 0,
RxDropped: 0,
TxBytes: stats.NetOutput,
TxPackets: 0,
TxErrors: 0,
TxDropped: 0,
EndpointID: inspect.NetworkSettings.EndpointID,
InstanceID: "",
}
systemUsage, _ := cgroups.GetSystemCPUUsage()
s := StatsJSON{
Stats: Stats{
Read: time.Now(),
PreRead: preRead,
PidsStats: docker.PidsStats{
Current: cgroupStat.Pids.Current,
Limit: 0,
},
BlkioStats: docker.BlkioStats{
IoServiceBytesRecursive: toBlkioStatEntry(cgroupStat.Blkio.IoServiceBytesRecursive),
IoServicedRecursive: nil,
IoQueuedRecursive: nil,
IoServiceTimeRecursive: nil,
IoWaitTimeRecursive: nil,
IoMergedRecursive: nil,
IoTimeRecursive: nil,
SectorsRecursive: nil,
},
CPUStats: CPUStats{
CPUUsage: docker.CPUUsage{
TotalUsage: cgroupStat.CPU.Usage.Total,
PercpuUsage: cgroupStat.CPU.Usage.PerCPU,
UsageInKernelmode: cgroupStat.CPU.Usage.Kernel,
UsageInUsermode: cgroupStat.CPU.Usage.Total - cgroupStat.CPU.Usage.Kernel,
},
CPU: stats.CPU,
SystemUsage: systemUsage,
OnlineCPUs: uint32(len(cgroupStat.CPU.Usage.PerCPU)),
ThrottlingData: docker.ThrottlingData{
Periods: 0,
ThrottledPeriods: 0,
ThrottledTime: 0,
},
},
PreCPUStats: preCPUStats,
MemoryStats: docker.MemoryStats{
Usage: cgroupStat.Memory.Usage.Usage,
MaxUsage: cgroupStat.Memory.Usage.Limit,
Stats: nil,
Failcnt: 0,
Limit: cgroupStat.Memory.Usage.Limit,
Commit: 0,
CommitPeak: 0,
PrivateWorkingSet: 0,
},
},
Name: stats.Name,
ID: stats.ContainerID,
Networks: net,
}
if err := coder.Encode(s); err != nil {
logrus.Errorf("Unable to encode stats: %v", err)
return
}
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
if !query.Stream {
return
}
preRead = s.Read
bits, err := json.Marshal(s.CPUStats)
if err != nil {
logrus.Errorf("Unable to marshal cpu stats: %q", err)
}
if err := json.Unmarshal(bits, &preCPUStats); err != nil {
logrus.Errorf("Unable to unmarshal previous stats: %q", err)
}
time.Sleep(DefaultStatsPeriod)
goto streamLabel
}
}
func toBlkioStatEntry(entries []cgroups.BlkIOEntry) []docker.BlkioStatEntry {
results := make([]docker.BlkioStatEntry, len(entries))
for i, e := range entries {
bits, err := json.Marshal(e)
if err != nil {
logrus.Errorf("unable to marshal blkio stats: %q", err)
}
if err := json.Unmarshal(bits, &results[i]); err != nil {
logrus.Errorf("unable to unmarshal blkio stats: %q", err)
}
}
return results
}
|
