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moby--moby/daemon/stats_collector.go
John Howard 340e5233b2 Windows: stats support
Signed-off-by: John Howard <jhoward@microsoft.com>
2016-09-16 11:56:15 -07:00

132 lines
3.5 KiB
Go

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