133 lines
3.5 KiB
Go
133 lines
3.5 KiB
Go
![]() |
// +build !solaris
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package daemon
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import (
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"bufio"
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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/container"
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"github.com/docker/docker/pkg/pubsub"
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)
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type statsSupervisor interface {
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// GetContainerStats collects all the stats related to a container
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GetContainerStats(container *container.Container) (*types.StatsJSON, error)
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}
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// newStatsCollector returns a new statsCollector that collections
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// stats for a registered container at the specified interval.
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// The collector allows non-running containers to be added
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// and will start processing stats when they are started.
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func (daemon *Daemon) newStatsCollector(interval time.Duration) *statsCollector {
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s := &statsCollector{
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interval: interval,
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supervisor: daemon,
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publishers: make(map[*container.Container]*pubsub.Publisher),
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bufReader: bufio.NewReaderSize(nil, 128),
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}
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platformNewStatsCollector(s)
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go s.run()
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return s
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}
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// statsCollector manages and provides container resource stats
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type statsCollector struct {
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m sync.Mutex
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supervisor statsSupervisor
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interval time.Duration
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publishers map[*container.Container]*pubsub.Publisher
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bufReader *bufio.Reader
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// The following fields are not set on Windows currently.
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clockTicksPerSecond uint64
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machineMemory uint64
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}
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// collect registers the container with the collector and adds it to
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// the event loop for collection on the specified interval returning
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// a channel for the subscriber to receive on.
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func (s *statsCollector) collect(c *container.Container) chan interface{} {
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s.m.Lock()
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defer s.m.Unlock()
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publisher, exists := s.publishers[c]
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if !exists {
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publisher = pubsub.NewPublisher(100*time.Millisecond, 1024)
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s.publishers[c] = publisher
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}
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return publisher.Subscribe()
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}
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// stopCollection closes the channels for all subscribers and removes
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// the container from metrics collection.
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func (s *statsCollector) stopCollection(c *container.Container) {
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s.m.Lock()
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if publisher, exists := s.publishers[c]; exists {
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publisher.Close()
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delete(s.publishers, c)
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}
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s.m.Unlock()
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}
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// unsubscribe removes a specific subscriber from receiving updates for a container's stats.
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func (s *statsCollector) unsubscribe(c *container.Container, ch chan interface{}) {
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s.m.Lock()
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publisher := s.publishers[c]
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if publisher != nil {
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publisher.Evict(ch)
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if publisher.Len() == 0 {
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delete(s.publishers, c)
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}
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}
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s.m.Unlock()
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}
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func (s *statsCollector) run() {
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type publishersPair struct {
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container *container.Container
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publisher *pubsub.Publisher
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}
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// we cannot determine the capacity here.
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// it will grow enough in first iteration
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var pairs []publishersPair
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for range time.Tick(s.interval) {
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// it does not make sense in the first iteration,
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// but saves allocations in further iterations
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pairs = pairs[:0]
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s.m.Lock()
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for container, publisher := range s.publishers {
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// copy pointers here to release the lock ASAP
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pairs = append(pairs, publishersPair{container, publisher})
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}
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s.m.Unlock()
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if len(pairs) == 0 {
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continue
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}
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systemUsage, err := s.getSystemCPUUsage()
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if err != nil {
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logrus.Errorf("collecting system cpu usage: %v", err)
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continue
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}
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for _, pair := range pairs {
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stats, err := s.supervisor.GetContainerStats(pair.container)
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if err != nil {
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if _, ok := err.(errNotRunning); !ok {
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logrus.Errorf("collecting stats for %s: %v", pair.container.ID, err)
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}
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continue
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}
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// FIXME: move to containerd on Linux (not Windows)
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stats.CPUStats.SystemUsage = systemUsage
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pair.publisher.Publish(*stats)
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}
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}
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}
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