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
|
// Package nest allows users to use a Logger interface to
// create another Logger interface.
package nest
import (
"fmt"
"github.com/go-log/log"
)
const (
// PreNest is a marker placed between the parent and child values
// when calling the wrapped Log method. For example:
//
// parent := SomeLogger()
// child := New(parent, "a", "b")
// child.Log("c", "d")
//
// will result in:
//
// parent.Log("a", "b", PreLog, "c", "d")
PreNest Marker = "pre-nest"
)
// Marker is a string synonym. The type difference allows underlying
// log implementations to distinguish between the PreNest marker and a
// "pre-nest" string literal.
type Marker string
// String returns a single space (regardless of the underlying marker
// string). This makes the output of parent loggers based on a
// fmt.Print style more readable, because fmt.Print only inserts space
// between two non-string operands.
func (m Marker) String() string {
return " "
}
type logger struct {
logger log.Logger
values []interface{}
}
func (logger *logger) Log(v ...interface{}) {
values := append(logger.values, PreNest)
logger.logger.Log(append(values, v...)...)
}
func (logger *logger) Logf(format string, v ...interface{}) {
logger.Log(fmt.Sprintf(format, v...))
}
func New(log log.Logger, v ...interface{}) *logger {
return &logger{
logger: log,
values: v,
}
}
func Newf(log log.Logger, format string, v ...interface{}) *logger {
return New(log, fmt.Sprintf(format, v...))
}
|
