package compat import ( "encoding/json" "net/http" "time" "github.com/containers/podman/v3/libpod" "github.com/containers/podman/v3/libpod/define" "github.com/containers/podman/v3/pkg/api/handlers/utils" "github.com/containers/podman/v3/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 }