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
|
package libpod
import (
"context"
"fmt"
"os"
"time"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/libpod/events"
"github.com/containers/podman/v3/libpod/logs"
"github.com/hpcloud/tail/watch"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// Log is a runtime function that can read one or more container logs.
func (r *Runtime) Log(ctx context.Context, containers []*Container, options *logs.LogOptions, logChannel chan *logs.LogLine) error {
for _, ctr := range containers {
if err := ctr.ReadLog(ctx, options, logChannel); err != nil {
return err
}
}
return nil
}
// ReadLog reads a containers log based on the input options and returns log lines over a channel.
func (c *Container) ReadLog(ctx context.Context, options *logs.LogOptions, logChannel chan *logs.LogLine) error {
switch c.LogDriver() {
case define.NoLogging:
return errors.Wrapf(define.ErrNoLogs, "this container is using the 'none' log driver, cannot read logs")
case define.JournaldLogging:
return c.readFromJournal(ctx, options, logChannel)
case define.JSONLogging:
// TODO provide a separate implementation of this when Conmon
// has support.
fallthrough
case define.KubernetesLogging, "":
return c.readFromLogFile(ctx, options, logChannel)
default:
return errors.Wrapf(define.ErrInternal, "unrecognized log driver %q, cannot read logs", c.LogDriver())
}
}
func (c *Container) readFromLogFile(ctx context.Context, options *logs.LogOptions, logChannel chan *logs.LogLine) error {
t, tailLog, err := logs.GetLogFile(c.LogPath(), options)
if err != nil {
// If the log file does not exist, this is not fatal.
if os.IsNotExist(errors.Cause(err)) {
return nil
}
return errors.Wrapf(err, "unable to read log file %s for %s ", c.ID(), c.LogPath())
}
options.WaitGroup.Add(1)
if len(tailLog) > 0 {
for _, nll := range tailLog {
nll.CID = c.ID()
nll.CName = c.Name()
if nll.Since(options.Since) && nll.Until(options.Until) {
logChannel <- nll
}
}
}
go func() {
defer options.WaitGroup.Done()
var partial string
for line := range t.Lines {
select {
case <-ctx.Done():
// the consumer has cancelled
return
default:
// fallthrough
}
nll, err := logs.NewLogLine(line.Text)
if err != nil {
logrus.Errorf("Error getting new log line: %v", err)
continue
}
if nll.Partial() {
partial += nll.Msg
continue
} else if !nll.Partial() && len(partial) > 0 {
nll.Msg = partial + nll.Msg
partial = ""
}
nll.CID = c.ID()
nll.CName = c.Name()
if nll.Since(options.Since) && nll.Until(options.Until) {
logChannel <- nll
}
}
}()
// Check if container is still running or paused
if options.Follow {
// If the container isn't running or if we encountered an error
// getting its state, instruct the logger to read the file
// until EOF.
state, err := c.State()
if err != nil || state != define.ContainerStateRunning {
// Make sure to wait at least for the poll duration
// before stopping the file logger (see #10675).
time.Sleep(watch.POLL_DURATION)
tailError := t.StopAtEOF()
if tailError != nil && fmt.Sprintf("%v", tailError) != "tail: stop at eof" {
logrus.Errorf("Error stopping logger: %v", tailError)
}
if err != nil && errors.Cause(err) != define.ErrNoSuchCtr {
logrus.Errorf("Error getting container state: %v", err)
}
return nil
}
// The container is running, so we need to wait until the container exited
go func() {
eventChannel := make(chan *events.Event)
eventOptions := events.ReadOptions{
EventChannel: eventChannel,
Filters: []string{"event=died", "container=" + c.ID()},
Stream: true,
}
go func() {
if err := c.runtime.Events(ctx, eventOptions); err != nil {
logrus.Errorf("Error waiting for container to exit: %v", err)
}
}()
// Now wait for the died event and signal to finish
// reading the log until EOF.
<-eventChannel
// Make sure to wait at least for the poll duration
// before stopping the file logger (see #10675).
time.Sleep(watch.POLL_DURATION)
tailError := t.StopAtEOF()
if tailError != nil && fmt.Sprintf("%v", tailError) != "tail: stop at eof" {
logrus.Errorf("Error stopping logger: %v", tailError)
}
}()
}
return nil
}
|
