230 lines
6.0 KiB
Go
230 lines
6.0 KiB
Go
package container
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import (
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"encoding/json"
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"errors"
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"io"
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"strings"
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"sync"
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"time"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/cli/command/formatter"
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"github.com/docker/docker/client"
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"golang.org/x/net/context"
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)
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type stats struct {
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ostype string
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mu sync.Mutex
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cs []*formatter.ContainerStats
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}
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// daemonOSType is set once we have at least one stat for a container
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// from the daemon. It is used to ensure we print the right header based
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// on the daemon platform.
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var daemonOSType string
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func (s *stats) add(cs *formatter.ContainerStats) bool {
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s.mu.Lock()
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defer s.mu.Unlock()
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if _, exists := s.isKnownContainer(cs.Container); !exists {
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s.cs = append(s.cs, cs)
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return true
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}
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return false
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}
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func (s *stats) remove(id string) {
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s.mu.Lock()
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if i, exists := s.isKnownContainer(id); exists {
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s.cs = append(s.cs[:i], s.cs[i+1:]...)
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}
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s.mu.Unlock()
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}
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func (s *stats) isKnownContainer(cid string) (int, bool) {
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for i, c := range s.cs {
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if c.Container == cid {
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return i, true
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}
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}
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return -1, false
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}
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func collect(ctx context.Context, s *formatter.ContainerStats, cli client.APIClient, streamStats bool, waitFirst *sync.WaitGroup) {
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logrus.Debugf("collecting stats for %s", s.Container)
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var (
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getFirst bool
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previousCPU uint64
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previousSystem uint64
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u = make(chan error, 1)
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)
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defer func() {
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// if error happens and we get nothing of stats, release wait group whatever
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if !getFirst {
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getFirst = true
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waitFirst.Done()
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}
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}()
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response, err := cli.ContainerStats(ctx, s.Container, streamStats)
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if err != nil {
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s.SetError(err)
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return
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}
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defer response.Body.Close()
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dec := json.NewDecoder(response.Body)
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go func() {
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for {
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var (
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v *types.StatsJSON
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memPercent, cpuPercent float64
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blkRead, blkWrite uint64 // Only used on Linux
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mem, memLimit, memPerc float64
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pidsStatsCurrent uint64
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)
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if err := dec.Decode(&v); err != nil {
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dec = json.NewDecoder(io.MultiReader(dec.Buffered(), response.Body))
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u <- err
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if err == io.EOF {
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break
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}
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time.Sleep(100 * time.Millisecond)
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continue
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}
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daemonOSType = response.OSType
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if daemonOSType != "windows" {
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// MemoryStats.Limit will never be 0 unless the container is not running and we haven't
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// got any data from cgroup
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if v.MemoryStats.Limit != 0 {
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memPercent = float64(v.MemoryStats.Usage) / float64(v.MemoryStats.Limit) * 100.0
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}
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previousCPU = v.PreCPUStats.CPUUsage.TotalUsage
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previousSystem = v.PreCPUStats.SystemUsage
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cpuPercent = calculateCPUPercentUnix(previousCPU, previousSystem, v)
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blkRead, blkWrite = calculateBlockIO(v.BlkioStats)
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mem = float64(v.MemoryStats.Usage)
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memLimit = float64(v.MemoryStats.Limit)
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memPerc = memPercent
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pidsStatsCurrent = v.PidsStats.Current
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} else {
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cpuPercent = calculateCPUPercentWindows(v)
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blkRead = v.StorageStats.ReadSizeBytes
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blkWrite = v.StorageStats.WriteSizeBytes
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mem = float64(v.MemoryStats.PrivateWorkingSet)
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}
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netRx, netTx := calculateNetwork(v.Networks)
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s.SetStatistics(formatter.StatsEntry{
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Name: v.Name,
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ID: v.ID,
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CPUPercentage: cpuPercent,
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Memory: mem,
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MemoryPercentage: memPerc,
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MemoryLimit: memLimit,
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NetworkRx: netRx,
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NetworkTx: netTx,
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BlockRead: float64(blkRead),
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BlockWrite: float64(blkWrite),
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PidsCurrent: pidsStatsCurrent,
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})
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u <- nil
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if !streamStats {
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return
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}
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}
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}()
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for {
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select {
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case <-time.After(2 * time.Second):
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// zero out the values if we have not received an update within
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// the specified duration.
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s.SetErrorAndReset(errors.New("timeout waiting for stats"))
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// if this is the first stat you get, release WaitGroup
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if !getFirst {
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getFirst = true
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waitFirst.Done()
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}
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case err := <-u:
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s.SetError(err)
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if err == io.EOF {
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break
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}
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if err != nil {
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continue
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}
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// if this is the first stat you get, release WaitGroup
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if !getFirst {
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getFirst = true
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waitFirst.Done()
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}
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}
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if !streamStats {
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return
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}
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}
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}
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func calculateCPUPercentUnix(previousCPU, previousSystem uint64, v *types.StatsJSON) float64 {
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var (
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cpuPercent = 0.0
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// calculate the change for the cpu usage of the container in between readings
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cpuDelta = float64(v.CPUStats.CPUUsage.TotalUsage) - float64(previousCPU)
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// calculate the change for the entire system between readings
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systemDelta = float64(v.CPUStats.SystemUsage) - float64(previousSystem)
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onlineCPUs = float64(v.CPUStats.OnlineCPUs)
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)
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if onlineCPUs == 0.0 {
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onlineCPUs = float64(len(v.CPUStats.CPUUsage.PercpuUsage))
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}
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if systemDelta > 0.0 && cpuDelta > 0.0 {
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cpuPercent = (cpuDelta / systemDelta) * onlineCPUs * 100.0
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}
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return cpuPercent
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}
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func calculateCPUPercentWindows(v *types.StatsJSON) float64 {
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// Max number of 100ns intervals between the previous time read and now
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possIntervals := uint64(v.Read.Sub(v.PreRead).Nanoseconds()) // Start with number of ns intervals
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possIntervals /= 100 // Convert to number of 100ns intervals
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possIntervals *= uint64(v.NumProcs) // Multiple by the number of processors
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// Intervals used
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intervalsUsed := v.CPUStats.CPUUsage.TotalUsage - v.PreCPUStats.CPUUsage.TotalUsage
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// Percentage avoiding divide-by-zero
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if possIntervals > 0 {
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return float64(intervalsUsed) / float64(possIntervals) * 100.0
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}
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return 0.00
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}
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func calculateBlockIO(blkio types.BlkioStats) (blkRead uint64, blkWrite uint64) {
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for _, bioEntry := range blkio.IoServiceBytesRecursive {
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switch strings.ToLower(bioEntry.Op) {
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case "read":
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blkRead = blkRead + bioEntry.Value
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case "write":
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blkWrite = blkWrite + bioEntry.Value
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}
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}
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return
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}
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func calculateNetwork(network map[string]types.NetworkStats) (float64, float64) {
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var rx, tx float64
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for _, v := range network {
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rx += float64(v.RxBytes)
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tx += float64(v.TxBytes)
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}
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return rx, tx
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}
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