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package compat
import (
"encoding/json"
"fmt"
"net/http"
"time"
"github.com/containers/common/pkg/cgroups"
"github.com/containers/podman/v4/libpod"
"github.com/containers/podman/v4/libpod/define"
"github.com/containers/podman/v4/pkg/api/handlers/utils"
api "github.com/containers/podman/v4/pkg/api/types"
"github.com/containers/storage/pkg/system"
docker "github.com/docker/docker/api/types"
"github.com/gorilla/schema"
runccgroups "github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/sirupsen/logrus"
)
const DefaultStatsPeriod = 5 * time.Second
func StatsContainer(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
decoder := r.Context().Value(api.DecoderKey).(*schema.Decoder)
query := struct {
Stream bool `schema:"stream"`
OneShot bool `schema:"one-shot"` // added schema for one shot
}{
Stream: true,
}
if err := decoder.Decode(&query, r.URL.Query()); err != nil {
utils.Error(w, http.StatusBadRequest, fmt.Errorf("failed to parse parameters for %s: %w", r.URL.String(), err))
return
}
if query.Stream && query.OneShot { // mismatch. one-shot can only be passed with stream=false
utils.Error(w, http.StatusBadRequest, define.ErrInvalidArg)
return
}
name := utils.GetName(r)
ctnr, err := runtime.LookupContainer(name)
if err != nil {
utils.ContainerNotFound(w, name, err)
return
}
stats, err := ctnr.GetContainerStats(nil)
if err != nil {
utils.InternalServerError(w, fmt.Errorf("failed to obtain Container %s stats: %w", name, err))
return
}
coder := json.NewEncoder(w)
// Write header and content type.
w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "application/json")
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
// Set up JSON encoder for streaming.
coder.SetEscapeHTML(true)
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{},
}
}
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: "",
}
cfg := ctnr.Config()
memoryLimit := cgroupStat.MemoryStats.Usage.Limit
if cfg.Spec.Linux != nil && cfg.Spec.Linux.Resources != nil && cfg.Spec.Linux.Resources.Memory != nil && *cfg.Spec.Linux.Resources.Memory.Limit > 0 {
memoryLimit = uint64(*cfg.Spec.Linux.Resources.Memory.Limit)
}
memInfo, err := system.ReadMemInfo()
if err != nil {
logrus.Errorf("Unable to get cgroup stats: %v", err)
return
}
// cap the memory limit to the available memory.
if memInfo.MemTotal > 0 && memoryLimit > uint64(memInfo.MemTotal) {
memoryLimit = uint64(memInfo.MemTotal)
}
systemUsage, _ := cgroups.GetSystemCPUUsage()
s := StatsJSON{
Stats: Stats{
Read: time.Now(),
PreRead: preRead,
PidsStats: docker.PidsStats{
Current: cgroupStat.PidsStats.Current,
Limit: 0,
},
BlkioStats: docker.BlkioStats{
IoServiceBytesRecursive: toBlkioStatEntry(cgroupStat.BlkioStats.IoServiceBytesRecursive),
IoServicedRecursive: nil,
IoQueuedRecursive: nil,
IoServiceTimeRecursive: nil,
IoWaitTimeRecursive: nil,
IoMergedRecursive: nil,
IoTimeRecursive: nil,
SectorsRecursive: nil,
},
CPUStats: CPUStats{
CPUUsage: docker.CPUUsage{
TotalUsage: cgroupStat.CpuStats.CpuUsage.TotalUsage,
PercpuUsage: cgroupStat.CpuStats.CpuUsage.PercpuUsage,
UsageInKernelmode: cgroupStat.CpuStats.CpuUsage.UsageInKernelmode,
UsageInUsermode: cgroupStat.CpuStats.CpuUsage.TotalUsage - cgroupStat.CpuStats.CpuUsage.UsageInKernelmode,
},
CPU: stats.CPU,
SystemUsage: systemUsage,
OnlineCPUs: uint32(len(cgroupStat.CpuStats.CpuUsage.PercpuUsage)),
ThrottlingData: docker.ThrottlingData{
Periods: 0,
ThrottledPeriods: 0,
ThrottledTime: 0,
},
},
PreCPUStats: preCPUStats,
MemoryStats: docker.MemoryStats{
Usage: cgroupStat.MemoryStats.Usage.Usage,
MaxUsage: cgroupStat.MemoryStats.Usage.MaxUsage,
Stats: nil,
Failcnt: 0,
Limit: memoryLimit,
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 || query.OneShot {
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 []runccgroups.BlkioStatEntry) []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
}
|
