package daemon import ( "encoding/json" "io" "github.com/docker/docker/api/types" "github.com/docker/docker/daemon/execdriver" "github.com/docker/libcontainer" "github.com/docker/libcontainer/cgroups" ) func (daemon *Daemon) ContainerStats(name string, out io.Writer) error { updates, err := daemon.SubscribeToContainerStats(name) if err != nil { return err } enc := json.NewEncoder(out) for v := range updates { update := v.(*execdriver.ResourceStats) ss := convertToAPITypes(update.Stats) ss.MemoryStats.Limit = uint64(update.MemoryLimit) ss.Read = update.Read ss.CpuStats.SystemUsage = update.SystemUsage if err := enc.Encode(ss); err != nil { // TODO: handle the specific broken pipe daemon.UnsubscribeToContainerStats(name, updates) return err } } return nil } // convertToAPITypes converts the libcontainer.Stats to the api specific // structs. This is done to preserve API compatibility and versioning. func convertToAPITypes(ls *libcontainer.Stats) *types.Stats { s := &types.Stats{} if ls.Interfaces != nil { s.Network = types.Network{} for _, iface := range ls.Interfaces { s.Network.RxBytes += iface.RxBytes s.Network.RxPackets += iface.RxPackets s.Network.RxErrors += iface.RxErrors s.Network.RxDropped += iface.RxDropped s.Network.TxBytes += iface.TxBytes s.Network.TxPackets += iface.TxPackets s.Network.TxErrors += iface.TxErrors s.Network.TxDropped += iface.TxDropped } } cs := ls.CgroupStats if cs != nil { s.BlkioStats = types.BlkioStats{ IoServiceBytesRecursive: copyBlkioEntry(cs.BlkioStats.IoServiceBytesRecursive), IoServicedRecursive: copyBlkioEntry(cs.BlkioStats.IoServicedRecursive), IoQueuedRecursive: copyBlkioEntry(cs.BlkioStats.IoQueuedRecursive), IoServiceTimeRecursive: copyBlkioEntry(cs.BlkioStats.IoServiceTimeRecursive), IoWaitTimeRecursive: copyBlkioEntry(cs.BlkioStats.IoWaitTimeRecursive), IoMergedRecursive: copyBlkioEntry(cs.BlkioStats.IoMergedRecursive), IoTimeRecursive: copyBlkioEntry(cs.BlkioStats.IoTimeRecursive), SectorsRecursive: copyBlkioEntry(cs.BlkioStats.SectorsRecursive), } cpu := cs.CpuStats s.CpuStats = types.CpuStats{ CpuUsage: types.CpuUsage{ TotalUsage: cpu.CpuUsage.TotalUsage, PercpuUsage: cpu.CpuUsage.PercpuUsage, UsageInKernelmode: cpu.CpuUsage.UsageInKernelmode, UsageInUsermode: cpu.CpuUsage.UsageInUsermode, }, ThrottlingData: types.ThrottlingData{ Periods: cpu.ThrottlingData.Periods, ThrottledPeriods: cpu.ThrottlingData.ThrottledPeriods, ThrottledTime: cpu.ThrottlingData.ThrottledTime, }, } mem := cs.MemoryStats s.MemoryStats = types.MemoryStats{ Usage: mem.Usage, MaxUsage: mem.MaxUsage, Stats: mem.Stats, Failcnt: mem.Failcnt, } } return s } func copyBlkioEntry(entries []cgroups.BlkioStatEntry) []types.BlkioStatEntry { out := make([]types.BlkioStatEntry, len(entries)) for i, re := range entries { out[i] = types.BlkioStatEntry{ Major: re.Major, Minor: re.Minor, Op: re.Op, Value: re.Value, } } return out }