Fix/con error (#27)

* Request and response packets are not aligned
* logger
* reconnet on error
* copy stream

Author: chenjunbiao

go.mod

@@ -3,6 +3,6 @@ module github.com/yomorun/yomo
 go 1.14
 
 require (
-	github.com/10cella/yomo-json-codec v0.2.4
+	github.com/10cella/yomo-json-codec v0.2.5
 	github.com/lucas-clemente/quic-go v0.17.1
 )

go.sum

@@ -21,6 +21,8 @@ github.com/10cella/yomo-json-codec v0.2.3 h1:IMcV7lR8cknbXFnNIU4JB6menKKGny0XXcI
 github.com/10cella/yomo-json-codec v0.2.3/go.mod h1:oApqc2PnZohrtlVJ3T1Knou9Ap9mcCJW1i3xiRtvF7c=
 github.com/10cella/yomo-json-codec v0.2.4 h1:bdOInT1MnBhXDsGBHx/fYn0CiXzKxrm5/kFjfJyYdrw=
 github.com/10cella/yomo-json-codec v0.2.4/go.mod h1:j4rl6bth7Bb6F8UC0SPN2XxlGGUsHGWO8LnrH5Q8RzI=
+github.com/10cella/yomo-json-codec v0.2.5 h1:XTWWFVkQENaLLBTxBdXyG61UneA8SQF/YdlnyHptV/o=
+github.com/10cella/yomo-json-codec v0.2.5/go.mod h1:j4rl6bth7Bb6F8UC0SPN2XxlGGUsHGWO8LnrH5Q8RzI=
 github.com/10cella/yomo-txtkv-codec v1.0.5 h1:rVdtBcsff3RG3BEq7AHq2WvNiGDF6IEKlTiplypfX+c=
 github.com/10cella/yomo-txtkv-codec v1.0.5/go.mod h1:nBfcD3qVq6kkSRHOgSUxK1+gMRoXI0obLF+b1eiyCtM=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=

pkg/util/log.go

@@ -0,0 +1,146 @@
+package util
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"reflect"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/yomorun/yomo/pkg/env"
+)
+
+type LogLevel uint8
+
+const (
+	LogLevelNothing LogLevel = iota
+	LogLevelError
+	LogLevelInfo
+	LogLevelDebug
+)
+
+const logEnv = "YOMO_LOG_LEVEL"
+
+type Logger interface {
+	SetLogLevel(LogLevel)
+	SetLogTimeFormat(format string)
+	WithPrefix(prefix string) Logger
+	Debug() bool
+
+	Errorf(format string, args ...interface{})
+	Infof(format string, args ...interface{})
+	Debugf(format string, args ...interface{})
+}
+
+var DefaultLogger Logger
+
+type defaultLogger struct {
+	prefix string
+
+	logLevel   LogLevel
+	timeFormat string
+}
+
+var _ Logger = &defaultLogger{}
+
+func (l *defaultLogger) SetLogLevel(level LogLevel) {
+	l.logLevel = level
+}
+
+func (l *defaultLogger) SetLogTimeFormat(format string) {
+	log.SetFlags(0)
+	l.timeFormat = format
+}
+
+func (l *defaultLogger) Debugf(format string, args ...interface{}) {
+	if l.logLevel == LogLevelDebug {
+		l.logMessage(format, args...)
+	}
+}
+
+func (l *defaultLogger) Infof(format string, args ...interface{}) {
+	if l.logLevel >= LogLevelInfo {
+		l.logMessage(format, args...)
+	}
+}
+
+func (l *defaultLogger) Errorf(format string, args ...interface{}) {
+	if l.logLevel >= LogLevelError {
+		l.logMessage(format, args...)
+	}
+}
+
+func (l *defaultLogger) logMessage(format string, args ...interface{}) {
+	var pre string
+
+	if len(l.timeFormat) > 0 {
+		pre = time.Now().Format(l.timeFormat) + " "
+	}
+	if len(l.prefix) > 0 {
+		pre += l.prefix + " "
+	}
+	log.Printf(pre+format, args...)
+}
+
+func (l *defaultLogger) WithPrefix(prefix string) Logger {
+	if len(l.prefix) > 0 {
+		prefix = l.prefix + " " + prefix
+	}
+	return &defaultLogger{
+		logLevel:   l.logLevel,
+		timeFormat: l.timeFormat,
+		prefix:     prefix,
+	}
+}
+
+func (l *defaultLogger) Debug() bool {
+	return l.logLevel == LogLevelDebug
+}
+
+func init() {
+	loadDefaultLogger()
+}
+
+var mux sync.Mutex
+
+func loadDefaultLogger() {
+	mux.Lock()
+	defer mux.Unlock()
+	if DefaultLogger == nil {
+		DefaultLogger = &defaultLogger{}
+		DefaultLogger.SetLogLevel(readLoggingEnv())
+	}
+}
+
+func readLoggingEnv() LogLevel {
+	lvl := strings.ToLower(env.GetString(logEnv, "info"))
+	switch lvl {
+	case "":
+		return LogLevelNothing
+	case "debug":
+		return LogLevelDebug
+	case "info":
+		return LogLevelInfo
+	case "error":
+		return LogLevelError
+	default:
+		fmt.Fprintln(os.Stderr, "invalid log level")
+		return LogLevelNothing
+	}
+}
+
+func GetLogger(prefix string) Logger {
+	if DefaultLogger == nil {
+		loadDefaultLogger()
+	}
+	return Logger.WithPrefix(DefaultLogger, prefix)
+}
+
+func GetLoggerOf(obj interface{}) Logger {
+	if DefaultLogger == nil {
+		loadDefaultLogger()
+	}
+	return Logger.WithPrefix(DefaultLogger, reflect.TypeOf(obj).Name())
+}