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log.go
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log.go
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package longredis
import (
"bytes"
"fmt"
"io"
"log"
"os"
"sync"
"github.com/sirupsen/logrus"
)
var dfLogger Logger = &NilLogger{}
func SetDefaultLogger(l Logger) {
dfLogger = l
}
type Logger interface {
Log(level LogLevel, msg string, keyvals ...interface{})
}
type LogLevel struct {
val int
str string
}
func (l LogLevel) Less(il LogLevel) bool {
return l.val < il.val
}
func (l LogLevel) Val() int {
return l.val
}
func (l LogLevel) String() string {
return l.str
}
var (
LevelDebug = LogLevel{val: 1, str: "debug"}
LevelInfo = LogLevel{val: 2, str: "info"}
LevelWarn = LogLevel{val: 3, str: "warn"}
LevelError = LogLevel{val: 4, str: "error"}
)
func ParseLevel(level string) LogLevel {
switch level {
case "debug":
return LevelDebug
case "info":
return LevelInfo
case "warn":
return LevelWarn
case "error":
return LevelError
default:
Log(LevelWarn, fmt.Sprintf("parse level failed of [%s], using error as default level", level))
return LevelError
}
}
type NilLogger struct{}
func (l *NilLogger) Log(level LogLevel, msg string, keyvals ...interface{}) {}
func Log(level LogLevel, msg string, keyvals ...interface{}) {
dfLogger.Log(level, msg, keyvals...)
}
type kvPairs struct {
vals []interface{}
}
func (p *kvPairs) Add(k string, v interface{}) {
p.vals = append(p.vals, k, v)
}
func (p *kvPairs) Expand() []interface{} {
return p.vals
}
type stdLogger struct {
level LogLevel
log *log.Logger
pool *sync.Pool
}
// NewStdLogger 基本格式为 xx=xxx
func NewStdLogger(level LogLevel, w io.Writer) Logger {
if w == nil {
w = os.Stderr
}
logger := log.New(w, "[longredis]", 0)
return &stdLogger{
log: logger,
level: level,
pool: &sync.Pool{
New: func() interface{} {
return new(bytes.Buffer)
},
},
}
}
func (l *stdLogger) Log(level LogLevel, msg string, keyvals ...interface{}) {
if level.Less(l.level) {
return
}
if (len(keyvals) % 2) != 0 {
keyvals = append(keyvals, "KEYVALS UNPAIRED")
}
keyvals = append(keyvals, "_mod", "redis")
buf := l.pool.Get().(*bytes.Buffer)
buf.WriteString(level.String() + " " + msg)
for i := 0; i < len(keyvals); i += 2 {
_, _ = fmt.Fprintf(buf, " %s=%v", keyvals[i], keyvals[i+1])
}
_ = l.log.Output(4, buf.String()) //nolint:gomnd
buf.Reset()
l.pool.Put(buf)
return
}
func NewLogrusLogger(l logrus.Logger) Logger {
return &logrusLogger{logger: l}
}
type logrusLogger struct {
logger logrus.Logger
}
func (l *logrusLogger) Log(level LogLevel, msg string, keyvals ...interface{}) {
l.logger.WithFields(logrus.Fields{}).Log(l.parseLevel(level), msg)
return
}
func (l *logrusLogger) parseLevel(le LogLevel) logrus.Level {
level, err := logrus.ParseLevel(le.String())
if err != nil {
fmt.Printf("[longredis] parse level (%s) to logrus level fail : %s", le.String(), err)
return logrus.ErrorLevel
}
return level
}