package events import ( "encoding/json" "fmt" "os" "time" "github.com/hpcloud/tail" "github.com/pkg/errors" ) // ErrNoJournaldLogging indicates that there is no journald logging // supported (requires libsystemd) var ErrNoJournaldLogging = errors.New("No support for journald logging") // String returns a string representation of EventerType func (et EventerType) String() string { switch et { case LogFile: return "file" case Journald: return "journald" case Null: return "none" default: return "invalid" } } // IsValidEventer checks if the given string is a valid eventer type. func IsValidEventer(eventer string) bool { switch eventer { case LogFile.String(): return true case Journald.String(): return true case Null.String(): return true default: return false } } // NewEvent creates a event struct and populates with // the given status and time. func NewEvent(status Status) Event { return Event{ Status: status, Time: time.Now(), } } // Recycle checks if the event log has reach a limit and if so // renames the current log and starts a new one. The remove bool // indicates the old log file should be deleted. func (e *Event) Recycle(path string, remove bool) error { return errors.New("not implemented") } // ToJSONString returns the event as a json'ified string func (e *Event) ToJSONString() (string, error) { b, err := json.Marshal(e) return string(b), err } // ToHumanReadable returns human readable event as a formatted string func (e *Event) ToHumanReadable() string { var humanFormat string switch e.Type { case Container, Pod: humanFormat = fmt.Sprintf("%s %s %s %s (image=%s, name=%s)", e.Time, e.Type, e.Status, e.ID, e.Image, e.Name) case Image: humanFormat = fmt.Sprintf("%s %s %s %s %s", e.Time, e.Type, e.Status, e.ID, e.Name) case System: humanFormat = fmt.Sprintf("%s %s %s", e.Time, e.Type, e.Status) case Volume: humanFormat = fmt.Sprintf("%s %s %s %s", e.Time, e.Type, e.Status, e.Name) } return humanFormat } // NewEventFromString takes stringified json and converts // it to an event func newEventFromJSONString(event string) (*Event, error) { e := Event{} if err := json.Unmarshal([]byte(event), &e); err != nil { return nil, err } return &e, nil } // ToString converts a Type to a string func (t Type) String() string { return string(t) } // ToString converts a status to a string func (s Status) String() string { return string(s) } // StringToType converts string to an EventType func StringToType(name string) (Type, error) { switch name { case Container.String(): return Container, nil case Image.String(): return Image, nil case Pod.String(): return Pod, nil case System.String(): return System, nil case Volume.String(): return Volume, nil case "": return "", ErrEventTypeBlank } return "", errors.Errorf("unknown event type %q", name) } // StringToStatus converts a string to an Event Status // TODO if we add more events, we might consider a go-generator to // create the switch statement func StringToStatus(name string) (Status, error) { switch name { case Attach.String(): return Attach, nil case Checkpoint.String(): return Checkpoint, nil case Cleanup.String(): return Cleanup, nil case Commit.String(): return Commit, nil case Create.String(): return Create, nil case Exec.String(): return Exec, nil case Exited.String(): return Exited, nil case Export.String(): return Export, nil case History.String(): return History, nil case Import.String(): return Import, nil case Init.String(): return Init, nil case Kill.String(): return Kill, nil case LoadFromArchive.String(): return LoadFromArchive, nil case Mount.String(): return Mount, nil case Pause.String(): return Pause, nil case Prune.String(): return Prune, nil case Pull.String(): return Pull, nil case Push.String(): return Push, nil case Refresh.String(): return Refresh, nil case Remove.String(): return Remove, nil case Renumber.String(): return Renumber, nil case Restart.String(): return Restart, nil case Restore.String(): return Restore, nil case Save.String(): return Save, nil case Start.String(): return Start, nil case Stop.String(): return Stop, nil case Sync.String(): return Sync, nil case Tag.String(): return Tag, nil case Unmount.String(): return Unmount, nil case Unpause.String(): return Unpause, nil case Untag.String(): return Untag, nil } return "", errors.Errorf("unknown event status %q", name) } func (e EventLogFile) getTail(options ReadOptions) (*tail.Tail, error) { reopen := true seek := tail.SeekInfo{Offset: 0, Whence: os.SEEK_END} if options.FromStart || !options.Stream { seek.Whence = 0 reopen = false } stream := options.Stream if len(options.Until) > 0 { stream = false } return tail.TailFile(e.options.LogFilePath, tail.Config{ReOpen: reopen, Follow: stream, Location: &seek, Logger: tail.DiscardingLogger}) }