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// +build systemd
package events
import (
"context"
"encoding/json"
"strconv"
"time"
"github.com/coreos/go-systemd/v22/journal"
"github.com/coreos/go-systemd/v22/sdjournal"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// DefaultEventerType is journald when systemd is available
const DefaultEventerType = Journald
// EventJournalD is the journald implementation of an eventer
type EventJournalD struct {
options EventerOptions
}
// newEventJournalD creates a new journald Eventer
func newEventJournalD(options EventerOptions) (Eventer, error) {
return EventJournalD{options}, nil
}
// Write to journald
func (e EventJournalD) Write(ee Event) error {
m := make(map[string]string)
m["SYSLOG_IDENTIFIER"] = "podman"
m["PODMAN_EVENT"] = ee.Status.String()
m["PODMAN_TYPE"] = ee.Type.String()
m["PODMAN_TIME"] = ee.Time.Format(time.RFC3339Nano)
// Add specialized information based on the podman type
switch ee.Type {
case Image:
m["PODMAN_NAME"] = ee.Name
m["PODMAN_ID"] = ee.ID
case Container, Pod:
m["PODMAN_IMAGE"] = ee.Image
m["PODMAN_NAME"] = ee.Name
m["PODMAN_ID"] = ee.ID
if ee.ContainerExitCode != 0 {
m["PODMAN_EXIT_CODE"] = strconv.Itoa(ee.ContainerExitCode)
}
// If we have container labels, we need to convert them to a string so they
// can be recorded with the event
if len(ee.Details.Attributes) > 0 {
b, err := json.Marshal(ee.Details.Attributes)
if err != nil {
return err
}
m["PODMAN_LABELS"] = string(b)
}
case Volume:
m["PODMAN_NAME"] = ee.Name
}
return journal.Send(string(ee.ToHumanReadable()), journal.PriInfo, m)
}
// Read reads events from the journal and sends qualified events to the event channel
func (e EventJournalD) Read(ctx context.Context, options ReadOptions) error {
defer close(options.EventChannel)
eventOptions, err := generateEventOptions(options.Filters, options.Since, options.Until)
if err != nil {
return errors.Wrapf(err, "failed to generate event options")
}
j, err := sdjournal.NewJournal()
if err != nil {
return err
}
// match only podman journal entries
podmanJournal := sdjournal.Match{Field: "SYSLOG_IDENTIFIER", Value: "podman"}
if err := j.AddMatch(podmanJournal.String()); err != nil {
return errors.Wrap(err, "failed to add journal filter for event log")
}
if len(options.Since) == 0 && len(options.Until) == 0 && options.Stream {
if err := j.SeekTail(); err != nil {
return errors.Wrap(err, "failed to seek end of journal")
}
// After SeekTail calling Next moves to a random entry.
// To prevent this we have to call Previous first.
// see: https://bugs.freedesktop.org/show_bug.cgi?id=64614
if _, err := j.Previous(); err != nil {
return errors.Wrap(err, "failed to move journal cursor to previous entry")
}
}
// the api requires a next|prev before getting a cursor
if _, err := j.Next(); err != nil {
return errors.Wrap(err, "failed to move journal cursor to next entry")
}
prevCursor, err := j.GetCursor()
if err != nil {
return errors.Wrap(err, "failed to get journal cursor")
}
for {
select {
case <-ctx.Done():
// the consumer has cancelled
return nil
default:
// fallthrough
}
if _, err := j.Next(); err != nil {
return errors.Wrap(err, "failed to move journal cursor to next entry")
}
newCursor, err := j.GetCursor()
if err != nil {
return errors.Wrap(err, "failed to get journal cursor")
}
if prevCursor == newCursor {
if len(options.Until) > 0 || !options.Stream {
break
}
_ = j.Wait(sdjournal.IndefiniteWait)
continue
}
prevCursor = newCursor
entry, err := j.GetEntry()
if err != nil {
return errors.Wrap(err, "failed to read journal entry")
}
newEvent, err := newEventFromJournalEntry(entry)
if err != nil {
// We can't decode this event.
// Don't fail hard - that would make events unusable.
// Instead, log and continue.
if errors.Cause(err) != ErrEventTypeBlank {
logrus.Errorf("Unable to decode event: %v", err)
}
continue
}
include := true
for _, filter := range eventOptions {
include = include && filter(newEvent)
}
if include {
options.EventChannel <- newEvent
}
}
return nil
}
func newEventFromJournalEntry(entry *sdjournal.JournalEntry) (*Event, error) { //nolint
newEvent := Event{}
eventType, err := StringToType(entry.Fields["PODMAN_TYPE"])
if err != nil {
return nil, err
}
eventTime, err := time.Parse(time.RFC3339Nano, entry.Fields["PODMAN_TIME"])
if err != nil {
return nil, err
}
eventStatus, err := StringToStatus(entry.Fields["PODMAN_EVENT"])
if err != nil {
return nil, err
}
newEvent.Type = eventType
newEvent.Time = eventTime
newEvent.Status = eventStatus
newEvent.Name = entry.Fields["PODMAN_NAME"]
switch eventType {
case Container, Pod:
newEvent.ID = entry.Fields["PODMAN_ID"]
newEvent.Image = entry.Fields["PODMAN_IMAGE"]
if code, ok := entry.Fields["PODMAN_EXIT_CODE"]; ok {
intCode, err := strconv.Atoi(code)
if err != nil {
logrus.Errorf("Error parsing event exit code %s", code)
} else {
newEvent.ContainerExitCode = intCode
}
}
// we need to check for the presence of labels recorded to a container event
if stringLabels, ok := entry.Fields["PODMAN_LABELS"]; ok && len(stringLabels) > 0 {
labels := make(map[string]string, 0)
if err := json.Unmarshal([]byte(stringLabels), &labels); err != nil {
return nil, err
}
// if we have labels, add them to the event
if len(labels) > 0 {
newEvent.Details = Details{Attributes: labels}
}
}
case Image:
newEvent.ID = entry.Fields["PODMAN_ID"]
}
return &newEvent, nil
}
// String returns a string representation of the logger
func (e EventJournalD) String() string {
return Journald.String()
}
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