forked from traefik/traefik
-
Notifications
You must be signed in to change notification settings - Fork 0
/
log.go
145 lines (115 loc) · 2.67 KB
/
log.go
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
package log
import (
"context"
"fmt"
"io"
"os"
"github.com/sirupsen/logrus"
)
type contextKey int
const (
loggerKey contextKey = iota
)
// Logger the Traefik logger
type Logger interface {
logrus.FieldLogger
WriterLevel(logrus.Level) *io.PipeWriter
}
var (
mainLogger Logger
logFilePath string
logFile *os.File
)
func init() {
mainLogger = logrus.StandardLogger()
logrus.SetOutput(os.Stdout)
}
// SetLogger sets the logger.
func SetLogger(l Logger) {
mainLogger = l
}
// SetOutput sets the standard logger output.
func SetOutput(out io.Writer) {
logrus.SetOutput(out)
}
// SetFormatter sets the standard logger formatter.
func SetFormatter(formatter logrus.Formatter) {
logrus.SetFormatter(formatter)
}
// SetLevel sets the standard logger level.
func SetLevel(level logrus.Level) {
logrus.SetLevel(level)
}
// GetLevel returns the standard logger level.
func GetLevel() logrus.Level {
return logrus.GetLevel()
}
// Str adds a string field
func Str(key, value string) func(logrus.Fields) {
return func(fields logrus.Fields) {
fields[key] = value
}
}
// With Adds fields
func With(ctx context.Context, opts ...func(logrus.Fields)) context.Context {
logger := FromContext(ctx)
fields := make(logrus.Fields)
for _, opt := range opts {
opt(fields)
}
logger = logger.WithFields(fields)
return context.WithValue(ctx, loggerKey, logger)
}
// FromContext Gets the logger from context
func FromContext(ctx context.Context) Logger {
if ctx == nil {
panic("nil context")
}
logger, ok := ctx.Value(loggerKey).(Logger)
if !ok {
logger = mainLogger
}
return logger
}
// WithoutContext Gets the main logger
func WithoutContext() Logger {
return mainLogger
}
// OpenFile opens the log file using the specified path
func OpenFile(path string) error {
logFilePath = path
var err error
logFile, err = os.OpenFile(logFilePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
return err
}
SetOutput(logFile)
return nil
}
// CloseFile closes the log and sets the Output to stdout
func CloseFile() error {
logrus.SetOutput(os.Stdout)
if logFile != nil {
return logFile.Close()
}
return nil
}
// RotateFile closes and reopens the log file to allow for rotation
// by an external source. If the log isn't backed by a file then
// it does nothing.
func RotateFile() error {
logger := FromContext(context.Background())
if logFile == nil && logFilePath == "" {
logger.Debug("Traefik log is not writing to a file, ignoring rotate request")
return nil
}
if logFile != nil {
defer func(f *os.File) {
_ = f.Close()
}(logFile)
}
if err := OpenFile(logFilePath); err != nil {
return fmt.Errorf("error opening log file: %s", err)
}
return nil
}