-
Notifications
You must be signed in to change notification settings - Fork 1
/
log.go
123 lines (104 loc) · 2.21 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
package structlog
import (
"fmt"
"time"
"github.com/danstiner/structlog/messagetemplates"
)
func New(sink Sink) Logger {
return Logger{
Sink: sink,
}
}
type Fields map[string]interface{}
type Logger struct {
Fields Fields
Sink Sink
}
type Level int
const (
TraceLevel Level = iota
InfoLevel
ErrorLevel
PanicLevel
)
func (l Level) String() string {
switch l {
case TraceLevel:
return "TRACE"
case InfoLevel:
return "INFO"
case ErrorLevel:
return "ERROR"
case PanicLevel:
return "PANIC"
default:
panic(fmt.Sprintf("Unknown log level: %d", l))
}
}
type Sink interface {
Log(event Event)
}
type Event struct {
Fields Fields
Level Level
Message string
Template string
Timestamp time.Time
}
const ErrorKey = "error"
func (l *Logger) With(key string, value interface{}) Logger {
newFields := make(Fields, len(l.Fields)+1)
for k, v := range l.Fields {
newFields[k] = v
}
newFields[key] = value
return Logger{newFields, l.Sink}
}
func (l *Logger) WithFields(fields Fields) Logger {
newFields := make(Fields, len(l.Fields)+len(fields))
for k, v := range l.Fields {
newFields[k] = v
}
for k, v := range fields {
newFields[k] = v
}
return Logger{newFields, l.Sink}
}
func (l *Logger) WithError(err error) Logger {
return l.With(ErrorKey, err)
}
func (l *Logger) Trace(template string, values ...interface{}) {
l.Sink.Log(l.event(TraceLevel, template, values...))
}
func (l *Logger) Info(template string, values ...interface{}) {
l.Sink.Log(l.event(InfoLevel, template, values...))
}
func (l *Logger) Error(template string, values ...interface{}) {
l.Sink.Log(l.event(ErrorLevel, template, values...))
}
func (l *Logger) Panic(template string, values ...interface{}) {
event := l.event(PanicLevel, template, values...)
l.Sink.Log(event)
panic(event)
}
func (l *Logger) event(level Level, template string, values ...interface{}) Event {
timestamp := time.Now()
message, kvs, err := messagetemplates.Format(template, values...)
if err != nil {
panic(err)
}
fields := make(Fields, len(l.Fields)+len(kvs))
for k, v := range l.Fields {
fields[k] = v
}
for _, kv := range kvs {
fields[kv.Key] = kv.Value
}
return Event{
fields,
level,
message,
template,
timestamp,
}
}