122 lines
2.9 KiB
Go
122 lines
2.9 KiB
Go
package containerd
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import (
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"os"
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"time"
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"github.com/Sirupsen/logrus"
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"github.com/opencontainers/runc/libcontainer"
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"github.com/rcrowley/go-metrics"
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)
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var (
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containerStartTimer = metrics.NewTimer()
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)
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// NewSupervisor returns an initialized Process supervisor.
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func NewSupervisor(stateDir string, concurrency int) (*Supervisor, error) {
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if err := os.MkdirAll(stateDir, 0755); err != nil {
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return nil, err
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}
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// register counters
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metrics.DefaultRegistry.Register("container-start-time", containerStartTimer)
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runtime, err := NewRuntime(stateDir)
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if err != nil {
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return nil, err
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}
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s := &Supervisor{
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stateDir: stateDir,
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containers: make(map[string]Container),
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runtime: runtime,
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}
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return s, nil
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}
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type Supervisor struct {
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// stateDir is the directory on the system to store container runtime state information.
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stateDir string
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containers map[string]Container
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runtime Runtime
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events chan Event
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}
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// Start is a non-blocking call that runs the supervisor for monitoring contianer processes and
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// executing new containers.
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//
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// This event loop is the only thing that is allowed to modify state of containers and processes.
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func (s *Supervisor) Start(events chan Event) error {
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if events == nil {
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return ErrEventChanNil
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}
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s.events = events
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go func() {
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for evt := range events {
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logrus.WithField("event", evt).Debug("containerd: processing event")
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switch e := evt.(type) {
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case *ExitEvent:
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logrus.WithFields(logrus.Fields{
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"pid": e.Pid,
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"status": e.Status,
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}).Debug("containerd: process exited")
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container, err := s.getContainerForPid(e.Pid)
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if err != nil {
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if err != errNoContainerForPid {
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logrus.WithField("error", err).Error("containerd: find container for pid")
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}
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continue
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}
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container.SetExited(e.Status)
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delete(s.containers, container.ID())
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if err := container.Delete(); err != nil {
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logrus.WithField("error", err).Error("containerd: deleting container")
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}
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case *CreateContainerEvent:
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start := time.Now()
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container, err := s.runtime.Create(e.ID, e.BundlePath)
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if err != nil {
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e.Err <- err
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continue
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}
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s.containers[e.ID] = container
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if err := container.Start(); err != nil {
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e.Err <- err
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continue
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}
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e.Err <- nil
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containerStartTimer.UpdateSince(start)
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}
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}
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}()
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return nil
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}
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func (s *Supervisor) getContainerForPid(pid int) (Container, error) {
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for _, container := range s.containers {
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cpid, err := container.Pid()
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if err != nil {
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if lerr, ok := err.(libcontainer.Error); ok {
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if lerr.Code() == libcontainer.ProcessNotExecuted {
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continue
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}
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}
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logrus.WithField("error", err).Error("containerd: get container pid")
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}
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if pid == cpid {
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return container, nil
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}
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}
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return nil, errNoContainerForPid
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}
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func (s *Supervisor) SendEvent(evt Event) {
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s.events <- evt
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}
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// Stop initiates a shutdown of the supervisor killing all processes under supervision.
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func (s *Supervisor) Stop() {
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}
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