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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
package ethlog
import (
"fmt"
"io"
"log"
"os"
"sync"
)
type LogSystem interface {
GetLogLevel() LogLevel
SetLogLevel(i LogLevel)
Println(v ...interface{})
Printf(format string, v ...interface{})
}
type logMessage struct {
LogLevel LogLevel
format bool
msg string
}
func newPrintlnLogMessage(level LogLevel, tag string, v ...interface{}) *logMessage {
return &logMessage{level, false, fmt.Sprintf("[%s] %s", tag, fmt.Sprint(v...))}
}
func newPrintfLogMessage(level LogLevel, tag string, format string, v ...interface{}) *logMessage {
return &logMessage{level, true, fmt.Sprintf("[%s] %s", tag, fmt.Sprintf(format, v...))}
}
func (msg *logMessage) send(logger LogSystem) {
if msg.format {
logger.Printf(msg.msg)
} else {
logger.Println(msg.msg)
}
}
var logMessages chan (*logMessage)
var logSystems []LogSystem
var quit chan bool
var drained chan bool
var shutdown chan bool
var mutex = sync.Mutex{}
type LogLevel uint8
const (
Silence LogLevel = iota
ErrorLevel
WarnLevel
InfoLevel
DebugLevel
DebugDetailLevel
)
// log messages are dispatched to log writers
func start() {
out:
for {
select {
case <-quit:
break out
case msg := <-logMessages:
for _, logSystem := range logSystems {
if logSystem.GetLogLevel() >= msg.LogLevel {
msg.send(logSystem)
}
}
case drained <- true:
default:
drained <- true // this blocks until a message is sent to the queu
}
}
close(shutdown)
}
func Reset() {
mutex.Lock()
defer mutex.Unlock()
if logSystems != nil {
quit <- true
select {
case <-drained:
}
<-shutdown
}
logSystems = nil
}
// waits until log messages are drained (dispatched to log writers)
func Flush() {
mutex.Lock()
defer mutex.Unlock()
if logSystems != nil {
<-drained
}
}
type Logger struct {
tag string
}
func NewLogger(tag string) *Logger {
return &Logger{tag}
}
func AddLogSystem(logSystem LogSystem) {
mutex.Lock()
defer mutex.Unlock()
if logSystems == nil {
logMessages = make(chan *logMessage)
quit = make(chan bool)
drained = make(chan bool, 1)
shutdown = make(chan bool, 1)
go start()
}
logSystems = append(logSystems, logSystem)
}
func send(msg *logMessage) {
select {
case <-drained:
}
logMessages <- msg
}
func (logger *Logger) sendln(level LogLevel, v ...interface{}) {
if logSystems != nil {
send(newPrintlnLogMessage(level, logger.tag, v...))
}
}
func (logger *Logger) sendf(level LogLevel, format string, v ...interface{}) {
if logSystems != nil {
send(newPrintfLogMessage(level, logger.tag, format, v...))
}
}
func (logger *Logger) Errorln(v ...interface{}) {
logger.sendln(ErrorLevel, v...)
}
func (logger *Logger) Warnln(v ...interface{}) {
logger.sendln(WarnLevel, v...)
}
func (logger *Logger) Infoln(v ...interface{}) {
logger.sendln(InfoLevel, v...)
}
func (logger *Logger) Debugln(v ...interface{}) {
logger.sendln(DebugLevel, v...)
}
func (logger *Logger) DebugDetailln(v ...interface{}) {
logger.sendln(DebugDetailLevel, v...)
}
func (logger *Logger) Errorf(format string, v ...interface{}) {
logger.sendf(ErrorLevel, format, v...)
}
func (logger *Logger) Warnf(format string, v ...interface{}) {
logger.sendf(WarnLevel, format, v...)
}
func (logger *Logger) Infof(format string, v ...interface{}) {
logger.sendf(InfoLevel, format, v...)
}
func (logger *Logger) Debugf(format string, v ...interface{}) {
logger.sendf(DebugLevel, format, v...)
}
func (logger *Logger) DebugDetailf(format string, v ...interface{}) {
logger.sendf(DebugDetailLevel, format, v...)
}
func (logger *Logger) Fatalln(v ...interface{}) {
logger.sendln(ErrorLevel, v...)
Flush()
os.Exit(0)
}
func (logger *Logger) Fatalf(format string, v ...interface{}) {
logger.sendf(ErrorLevel, format, v...)
Flush()
os.Exit(0)
}
type StdLogSystem struct {
logger *log.Logger
level LogLevel
}
func (t *StdLogSystem) Println(v ...interface{}) {
t.logger.Println(v...)
}
func (t *StdLogSystem) Printf(format string, v ...interface{}) {
t.logger.Printf(format, v...)
}
func (t *StdLogSystem) SetLogLevel(i LogLevel) {
t.level = i
}
func (t *StdLogSystem) GetLogLevel() LogLevel {
return t.level
}
func NewStdLogSystem(writer io.Writer, flags int, level LogLevel) *StdLogSystem {
logger := log.New(writer, "", flags)
return &StdLogSystem{logger, level}
}
|
