101 lines
2.4 KiB
Go
101 lines
2.4 KiB
Go
package supervisor
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import (
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"encoding/json"
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"io"
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"os"
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"path/filepath"
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"time"
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"github.com/Sirupsen/logrus"
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"github.com/docker/containerd/runtime"
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)
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type containerInfo struct {
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container runtime.Container
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}
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func setupEventLog(s *Supervisor, retainCount int) error {
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if err := readEventLog(s); err != nil {
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return err
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}
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logrus.WithField("count", len(s.eventLog)).Debug("containerd: read past events")
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events := s.Events(time.Time{}, false, "")
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return eventLogger(s, filepath.Join(s.config.StateDir, "events.log"), events, retainCount)
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}
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func eventLogger(s *Supervisor, path string, events chan Event, retainCount int) error {
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f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_APPEND|os.O_TRUNC, 0755)
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if err != nil {
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return err
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}
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go func() {
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var (
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count = len(s.eventLog)
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enc = json.NewEncoder(f)
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)
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for e := range events {
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// if we have a specified retain count make sure the truncate the event
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// log if it grows past the specified number of events to keep.
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if retainCount > 0 {
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if count > retainCount {
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logrus.Debug("truncating event log")
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// close the log file
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if f != nil {
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f.Close()
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}
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slice := retainCount - 1
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l := len(s.eventLog)
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if slice >= l {
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slice = l
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}
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s.eventLock.Lock()
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s.eventLog = s.eventLog[len(s.eventLog)-slice:]
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s.eventLock.Unlock()
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if f, err = os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_APPEND|os.O_TRUNC, 0755); err != nil {
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logrus.WithField("error", err).Error("containerd: open event to journal")
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continue
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}
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enc = json.NewEncoder(f)
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count = 0
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for _, le := range s.eventLog {
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if err := enc.Encode(le); err != nil {
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logrus.WithField("error", err).Error("containerd: write event to journal")
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}
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}
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}
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}
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s.eventLock.Lock()
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s.eventLog = append(s.eventLog, e)
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s.eventLock.Unlock()
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count++
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if err := enc.Encode(e); err != nil {
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logrus.WithField("error", err).Error("containerd: write event to journal")
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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 readEventLog(s *Supervisor) error {
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f, err := os.Open(filepath.Join(s.config.StateDir, "events.log"))
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if err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return err
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}
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defer f.Close()
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dec := json.NewDecoder(f)
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for {
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var e Event
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if err := dec.Decode(&e); err != nil {
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if err == io.EOF {
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break
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}
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return err
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}
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s.eventLog = append(s.eventLog, e)
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}
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return nil
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}
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