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package generic
import (
"encoding/json"
"net/http"
"time"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/libpod/define"
"github.com/containers/libpod/pkg/api/handlers"
"github.com/containers/libpod/pkg/api/handlers/utils"
"github.com/containers/libpod/pkg/cgroups"
docker "github.com/docker/docker/api/types"
"github.com/gorilla/mux"
"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) {
// 200 no error
// 404 no such
// 500 internal
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 := mux.Vars(r)["name"]
ctnr, err := runtime.LookupContainer(name)
if err != nil {
utils.ContainerNotFound(w, name, err)
return
}
state, err := ctnr.State()
if err != nil {
utils.InternalServerError(w, err)
return
}
if state != define.ContainerStateRunning && !query.Stream {
utils.WriteJSON(w, http.StatusOK, &handlers.Stats{StatsJSON: docker.StatsJSON{
Name: ctnr.Name(),
ID: ctnr.ID(),
}})
return
}
var preRead time.Time
var preCPUStats docker.CPUStats
stats, err := ctnr.GetContainerStats(&libpod.ContainerStats{})
if err != nil {
utils.InternalServerError(w, errors.Wrapf(err, "Failed to obtain Container %s stats", name))
return
}
if query.Stream {
preRead = time.Now()
preCPUStats = docker.CPUStats{
CPUUsage: docker.CPUUsage{
TotalUsage: stats.CPUNano,
PercpuUsage: []uint64{uint64(stats.CPU)},
UsageInKernelmode: 0,
UsageInUsermode: 0,
},
SystemUsage: 0,
OnlineCPUs: 0,
ThrottlingData: docker.ThrottlingData{},
}
time.Sleep(DefaultStatsPeriod)
}
cgroupPath, _ := ctnr.CGroupPath()
cgroup, _ := cgroups.Load(cgroupPath)
for ok := true; ok; ok = query.Stream {
state, _ := ctnr.State()
if state != define.ContainerStateRunning {
time.Sleep(10 * time.Second)
continue
}
stats, _ := ctnr.GetContainerStats(stats)
cgroupStat, _ := cgroup.Stat()
inspect, _ := ctnr.Inspect(false)
net := make(map[string]docker.NetworkStats)
net[inspect.NetworkSettings.EndpointID] = 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: "",
}
s := handlers.Stats{StatsJSON: docker.StatsJSON{
Stats: docker.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: docker.CPUStats{
CPUUsage: docker.CPUUsage{
TotalUsage: cgroupStat.CPU.Usage.Total,
PercpuUsage: []uint64{uint64(stats.CPU)},
UsageInKernelmode: cgroupStat.CPU.Usage.Kernel,
UsageInUsermode: cgroupStat.CPU.Usage.Total - cgroupStat.CPU.Usage.Kernel,
},
SystemUsage: 0,
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,
}}
utils.WriteJSON(w, http.StatusOK, s)
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
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)
}
}
func toBlkioStatEntry(entries []cgroups.BlkIOEntry) []docker.BlkioStatEntry {
results := make([]docker.BlkioStatEntry, 0, 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
}
|
