Golang APIClient.ContainerStats方法代碼示例

func (s *containerStats) Collect(ctx context.Context, cli client.APIClient, streamStats bool, waitFirst *sync.WaitGroup) {
	logrus.Debugf("collecting stats for %s", s.Name)
	var (
		getFirst       bool
		previousCPU    uint64
		previousSystem uint64
		u              = make(chan error, 1)
	)

	defer func() {
		// if error happens and we get nothing of stats, release wait group whatever
		if !getFirst {
			getFirst = true
			waitFirst.Done()
		}
	}()

	responseBody, err := cli.ContainerStats(ctx, s.Name, streamStats)
	if err != nil {
		s.mu.Lock()
		s.err = err
		s.mu.Unlock()
		return
	}
	defer responseBody.Close()

	dec := json.NewDecoder(responseBody)
	go func() {
		for {
			var v *types.StatsJSON

			if err := dec.Decode(&v); err != nil {
				dec = json.NewDecoder(io.MultiReader(dec.Buffered(), responseBody))
				u <- err
				if err == io.EOF {
					break
				}
				time.Sleep(100 * time.Millisecond)
				continue
			}

			var memPercent = 0.0
			var cpuPercent = 0.0

			// MemoryStats.Limit will never be 0 unless the container is not running and we haven't
			// got any data from cgroup
			if v.MemoryStats.Limit != 0 {
				memPercent = float64(v.MemoryStats.Usage) / float64(v.MemoryStats.Limit) * 100.0
			}

			previousCPU = v.PreCPUStats.CPUUsage.TotalUsage
			previousSystem = v.PreCPUStats.SystemUsage
			cpuPercent = calculateCPUPercent(previousCPU, previousSystem, v)
			blkRead, blkWrite := calculateBlockIO(v.BlkioStats)
			s.mu.Lock()
			s.CPUPercentage = cpuPercent
			s.Memory = float64(v.MemoryStats.Usage)
			s.MemoryLimit = float64(v.MemoryStats.Limit)
			s.MemoryPercentage = memPercent
			s.NetworkRx, s.NetworkTx = calculateNetwork(v.Networks)
			s.BlockRead = float64(blkRead)
			s.BlockWrite = float64(blkWrite)
			s.PidsCurrent = v.PidsStats.Current
			s.mu.Unlock()
			u <- nil
			if !streamStats {
				return
			}
		}
	}()
	for {
		select {
		case <-time.After(2 * time.Second):
			// zero out the values if we have not received an update within
			// the specified duration.
			s.mu.Lock()
			s.CPUPercentage = 0
			s.Memory = 0
			s.MemoryPercentage = 0
			s.MemoryLimit = 0
			s.NetworkRx = 0
			s.NetworkTx = 0
			s.BlockRead = 0
			s.BlockWrite = 0
			s.PidsCurrent = 0
			s.err = errors.New("timeout waiting for stats")
			s.mu.Unlock()
			// if this is the first stat you get, release WaitGroup
			if !getFirst {
				getFirst = true
				waitFirst.Done()
			}
		case err := <-u:
			if err != nil {
				s.mu.Lock()
				s.err = err
				s.mu.Unlock()
				continue
			}
			s.err = nil
//.........這裏部分代碼省略.........

func collect(ctx context.Context, s *formatter.ContainerStats, cli client.APIClient, streamStats bool, waitFirst *sync.WaitGroup) {
	logrus.Debugf("collecting stats for %s", s.Container)
	var (
		getFirst       bool
		previousCPU    uint64
		previousSystem uint64
		u              = make(chan error, 1)
	)

	defer func() {
		// if error happens and we get nothing of stats, release wait group whatever
		if !getFirst {
			getFirst = true
			waitFirst.Done()
		}
	}()

	response, err := cli.ContainerStats(ctx, s.Container, streamStats)
	if err != nil {
		s.SetError(err)
		return
	}
	defer response.Body.Close()

	dec := json.NewDecoder(response.Body)
	go func() {
		for {
			var (
				v                      *types.StatsJSON
				memPercent, cpuPercent float64
				blkRead, blkWrite      uint64 // Only used on Linux
				mem, memLimit, memPerc float64
				pidsStatsCurrent       uint64
			)

			if err := dec.Decode(&v); err != nil {
				dec = json.NewDecoder(io.MultiReader(dec.Buffered(), response.Body))
				u <- err
				if err == io.EOF {
					break
				}
				time.Sleep(100 * time.Millisecond)
				continue
			}

			daemonOSType = response.OSType

			if daemonOSType != "windows" {
				// MemoryStats.Limit will never be 0 unless the container is not running and we haven't
				// got any data from cgroup
				if v.MemoryStats.Limit != 0 {
					memPercent = float64(v.MemoryStats.Usage) / float64(v.MemoryStats.Limit) * 100.0
				}
				previousCPU = v.PreCPUStats.CPUUsage.TotalUsage
				previousSystem = v.PreCPUStats.SystemUsage
				cpuPercent = calculateCPUPercentUnix(previousCPU, previousSystem, v)
				blkRead, blkWrite = calculateBlockIO(v.BlkioStats)
				mem = float64(v.MemoryStats.Usage)
				memLimit = float64(v.MemoryStats.Limit)
				memPerc = memPercent
				pidsStatsCurrent = v.PidsStats.Current
			} else {
				cpuPercent = calculateCPUPercentWindows(v)
				blkRead = v.StorageStats.ReadSizeBytes
				blkWrite = v.StorageStats.WriteSizeBytes
				mem = float64(v.MemoryStats.PrivateWorkingSet)
			}
			netRx, netTx := calculateNetwork(v.Networks)
			s.SetStatistics(formatter.StatsEntry{
				Name:             v.Name,
				ID:               v.ID,
				CPUPercentage:    cpuPercent,
				Memory:           mem,
				MemoryPercentage: memPerc,
				MemoryLimit:      memLimit,
				NetworkRx:        netRx,
				NetworkTx:        netTx,
				BlockRead:        float64(blkRead),
				BlockWrite:       float64(blkWrite),
				PidsCurrent:      pidsStatsCurrent,
			})
			u <- nil
			if !streamStats {
				return
			}
		}
	}()
	for {
		select {
		case <-time.After(2 * time.Second):
			// zero out the values if we have not received an update within
			// the specified duration.
			s.SetErrorAndReset(errors.New("timeout waiting for stats"))
			// if this is the first stat you get, release WaitGroup
			if !getFirst {
				getFirst = true
				waitFirst.Done()
			}
		case err := <-u:
			if err != nil {
//.........這裏部分代碼省略.........