1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
// +build systemd
package events
import (
"context"
"encoding/json"
"strconv"
"time"
"github.com/containers/podman/v2/pkg/util"
"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 Network:
m["PODMAN_ID"] = ee.ID
m["PODMAN_NETWORK_NAME"] = ee.Network
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")
}
var untilTime time.Time
if len(options.Until) > 0 {
untilTime, err = util.ParseInputTime(options.Until)
if err != nil {
return err
}
}
j, err := sdjournal.NewJournal()
if err != nil {
return err
}
defer func() {
if err := j.Close(); err != nil {
logrus.Errorf("Unable to close journal :%v", 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 !options.Stream || (len(options.Until) > 0 && time.Now().After(untilTime)) {
break
}
t := sdjournal.IndefiniteWait
if len(options.Until) > 0 {
t = time.Until(untilTime)
}
_ = j.Wait(t)
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 Network:
newEvent.ID = entry.Fields["PODMAN_ID"]
newEvent.Network = entry.Fields["PODMAN_NETWORK_NAME"]
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()
}
|
