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 logger
import (
"fmt"
"os"
"strings"
"sync"
"time"
"src.userspace.com.au/logger/message"
"src.userspace.com.au/logger/writers/kv"
)
// Logger is a simple logger with optional structured.
type Logger struct {
debug bool
name string
fields map[string]string
writers []message.Writer
lock *sync.RWMutex
}
// New creates a new logger instance
func New(opts ...Option) (*Logger, error) {
l := &Logger{
debug: (os.Getenv("DEBUG") != ""),
fields: make(map[string]string),
lock: new(sync.RWMutex),
writers: []message.Writer{},
}
// Apply variadic options
for _, opt := range opts {
if err := opt(l); err != nil {
return nil, err
}
}
// Add default writer
if len(l.writers) == 0 {
kv, err := kv.New(kv.SetOutput(os.Stderr))
if err != nil {
return nil, err
}
l.writers = []message.Writer{kv}
}
return l, nil
}
// Log a message.
func (l *Logger) Log(args ...interface{}) *Logger {
return l.log(args...)
}
func (l *Logger) log(args ...interface{}) *Logger {
if len(args) == 0 {
return l
}
m := message.Message{
Name: l.name,
Time: time.Now(),
Content: toString(args...),
Fields: l.fields,
}
for _, w := range l.writers {
w.Write(m)
}
return l
}
// toString converts interface to string
func toString(args ...interface{}) string {
var buf strings.Builder
last := len(args)
for i, a := range args {
buf.WriteString(fmt.Sprint(a))
if i < last-1 {
buf.WriteByte(' ')
}
}
return buf.String()
}
// Info is an alias for Log.
func (l *Logger) Info(args ...interface{}) *Logger {
return l.log(args...)
}
// Debug logs a debug message.
func (l *Logger) Debug(args ...interface{}) *Logger {
if l.debug {
return l.log(args...)
}
return l
}
// IsDebug determines the debug status for a logger instance.
// Use this to conditionally execute blocks of code depending on the log verbosity.
func (l *Logger) IsDebug() bool { return l.debug }
// Field enables setting or changing the default fields for a logger instance.
func (l *Logger) Field(k string, v interface{}) *Logger {
l.lock.Lock()
defer l.lock.Unlock()
l.fields[k] = toString(v)
return l
}
// Fields enables setting or changing the default fields for a logger instance.
func (l *Logger) Fields(args ...interface{}) *Logger {
l.lock.Lock()
defer l.lock.Unlock()
if len(args)%2 != 0 {
args = append(args, "")
}
for i := 0; i < len(args); i += 2 {
l.fields[toString(args[i])] = toString(args[i+1])
}
return l
}
// FieldMap enables setting or changing the default fields for a logger instance.
func (l *Logger) FieldMap(f map[string]interface{}) *Logger {
l.lock.Lock()
defer l.lock.Unlock()
for k, v := range f {
l.fields[k] = toString(v)
}
return l
}
// Named creates a new instance of a logger with a new name.
func (l *Logger) Named(n string) *Logger {
nl := *l
if l.name != "" {
nl.name = l.name + "." + n
} else {
nl.name = n
}
return &nl
}
|
