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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)
// check if the container has labels and add it to the output
if len(e.Attributes) > 0 {
for k, v := range e.Attributes {
humanFormat += fmt.Sprintf(", %s=%s", k, v)
}
}
humanFormat += ")"
case Network:
humanFormat = fmt.Sprintf("%s %s %s %s (container=%s, name=%s)", e.Time, e.Type, e.Status, e.ID, e.ID, e.Network)
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 Network.String():
return Network, 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 Build.String():
return Build, 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 NetworkConnect.String():
return NetworkConnect, nil
case NetworkDisconnect.String():
return NetworkDisconnect, 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, Poll: true})
}
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