Added JSON logging

Signed-off-by: Vishal Rana <[email protected]>

echo.go

@@ -267,8 +267,8 @@ func (e *Echo) SetLogOutput(w io.Writer) {
 	e.logger.SetOutput(w)
 }
 
-// SetLogLevel sets the log level for the logger. Default value `3` (ERROR).
-func (e *Echo) SetLogLevel(l uint8) {
+// SetLogLevel sets the log level for the logger. Default value ERROR.
+func (e *Echo) SetLogLevel(l glog.Lvl) {
 	e.logger.SetLevel(l)
 }
 

log/logger.go

@@ -1,23 +1,33 @@
 package log
 
-import "io"
+import (
+	"io"
+
+	"github.com/labstack/gommon/log"
+)
 
 type (
 	// Logger defines the logging interface.
 	Logger interface {
 		SetOutput(io.Writer)
-		SetLevel(uint8)
+		SetLevel(log.Lvl)
 		Print(...interface{})
 		Printf(string, ...interface{})
+		Printj(log.JSON)
 		Debug(...interface{})
 		Debugf(string, ...interface{})
+		Debugj(log.JSON)
 		Info(...interface{})
 		Infof(string, ...interface{})
+		Infoj(log.JSON)
 		Warn(...interface{})
 		Warnf(string, ...interface{})
+		Warnj(log.JSON)
 		Error(...interface{})
 		Errorf(string, ...interface{})
+		Errorj(log.JSON)
 		Fatal(...interface{})
+		Fatalj(log.JSON)
 		Fatalf(string, ...interface{})
 	}
 )

middleware/logger.go

@@ -2,7 +2,6 @@ package middleware
 
 import (
 	"bytes"
-	"fmt"
 	"io"
 	"net"
 	"os"
@@ -158,9 +157,8 @@ func LoggerWithConfig(config LoggerConfig) echo.MiddlewareFunc {
 					return w.Write([]byte(b))
 				case "tx_bytes":
 					return w.Write([]byte(strconv.FormatInt(res.Size(), 10)))
-				default:
-					return w.Write([]byte(fmt.Sprintf("[unknown tag %s]", tag)))
 				}
+				return 0, nil
 			})
 			if err == nil {
 				config.Output.Write(buf.Bytes())