Add docker stats --no-stream show cpu usage

Signed-off-by: Lei Jitang <leijitang@huawei.com>

api/client/stats.go

@@ -46,7 +46,6 @@ func (s *containerStats) Collect(cli *DockerCli, streamStats bool) {
 	var (
 		previousCPU    uint64
 		previousSystem uint64
-		start          = true
 		dec            = json.NewDecoder(stream)
 		u              = make(chan error, 1)
 	)
@@ -61,10 +60,9 @@ func (s *containerStats) Collect(cli *DockerCli, streamStats bool) {
 				memPercent = float64(v.MemoryStats.Usage) / float64(v.MemoryStats.Limit) * 100.0
 				cpuPercent = 0.0
 			)
-			if !start {
-				cpuPercent = calculateCPUPercent(previousCPU, previousSystem, v)
-			}
-			start = false
+			previousCPU = v.PreCpuStats.CpuUsage.TotalUsage
+			previousSystem = v.PreCpuStats.SystemUsage
+			cpuPercent = calculateCPUPercent(previousCPU, previousSystem, v)
 			s.mu.Lock()
 			s.CPUPercentage = cpuPercent
 			s.Memory = float64(v.MemoryStats.Usage)
@@ -73,8 +71,6 @@ func (s *containerStats) Collect(cli *DockerCli, streamStats bool) {
 			s.NetworkRx = float64(v.Network.RxBytes)
 			s.NetworkTx = float64(v.Network.TxBytes)
 			s.mu.Unlock()
-			previousCPU = v.CpuStats.CpuUsage.TotalUsage
-			previousSystem = v.CpuStats.SystemUsage
 			u <- nil
 			if !streamStats {
 				return
@@ -151,7 +147,7 @@ func (cli *DockerCli) CmdStats(args ...string) error {
 	}
 	// do a quick pause so that any failed connections for containers that do not exist are able to be
 	// evicted before we display the initial or default values.
-	time.Sleep(500 * time.Millisecond)
+	time.Sleep(1500 * time.Millisecond)
 	var errs []string
 	for _, c := range cStats {
 		c.mu.Lock()

api/types/stats.go

@@ -84,6 +84,7 @@ type Network struct {
 type Stats struct {
 	Read        time.Time   `json:"read"`
 	Network     Network     `json:"network,omitempty"`
+	PreCpuStats CpuStats    `json:"precpu_stats,omitempty"`
 	CpuStats    CpuStats    `json:"cpu_stats,omitempty"`
 	MemoryStats MemoryStats `json:"memory_stats,omitempty"`
 	BlkioStats  BlkioStats  `json:"blkio_stats,omitempty"`