diff --git a/go.mod b/go.mod
index a2a9e04c2..714f2934f 100644
--- a/go.mod
+++ b/go.mod
@@ -48,7 +48,9 @@ require (
 	google.golang.org/grpc v1.22.0
 	gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
 	gopkg.in/go-playground/validator.v9 v9.26.0
+	gopkg.in/yaml.v2 v2.2.2
 	honnef.co/go/tools v0.0.0-20190605142022-0a11fc526260 // indirect
+
 )
 
 replace (
diff --git a/go.sum b/go.sum
index f78aed5dd..b0075cdbd 100644
--- a/go.sum
+++ b/go.sum
@@ -112,6 +112,8 @@ github.com/tsuna/gohbase v0.0.0-20190201102810-d3184c1526df h1:jYiwqXfoRWU6pJMzC
 github.com/tsuna/gohbase v0.0.0-20190201102810-d3184c1526df/go.mod h1:3HfLQly3YNLGxNv/2YOfmz30vcjG9hbuME1GpxoLlGs=
 github.com/urfave/cli v1.20.0 h1:fDqGv3UG/4jbVl/QkFwEdddtEDjh/5Ov6X+0B/3bPaw=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -120,5 +122,7 @@ gopkg.in/go-playground/assert.v1 v1.2.1 h1:xoYuJVE7KT85PYWrN730RguIQO0ePzVRfFMXa
 gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
 gopkg.in/go-playground/validator.v9 v9.26.0 h1:2NPPsBpD0ZoxshmLWewQru8rWmbT5JqSzz9D1ZrAjYQ=
 gopkg.in/go-playground/validator.v9 v9.26.0/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190605142022-0a11fc526260/go.mod h1:JlmFZigtG9vBVR3QGIQ9g/Usz4BzH+Xm6Z8iHQWRYUw=
diff --git a/pkg/conf/paladin/value.go b/pkg/conf/paladin/value.go
index ee6dd3db2..bafb86b99 100644
--- a/pkg/conf/paladin/value.go
+++ b/pkg/conf/paladin/value.go
@@ -2,11 +2,13 @@ package paladin
 
 import (
 	"encoding"
+	"encoding/json"
 	"reflect"
 	"time"
 
 	"github.com/BurntSushi/toml"
 	"github.com/pkg/errors"
+	yaml "gopkg.in/yaml.v2"
 )
 
 // ErrNotExist value key not exist.
@@ -155,3 +157,20 @@ func (v *Value) UnmarshalTOML(dst interface{}) error {
 	}
 	return toml.Unmarshal([]byte(text), dst)
 }
+
+// UnmarshalJSON unmarhsal json to struct.
+func (v *Value) UnmarshalJSON(dst interface{}) error {
+	text, err := v.Raw()
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal([]byte(text), dst)
+}
+
+func (v *Value) UnmarshalYAML(dst interface{}) error {
+	text, err := v.Raw()
+	if err != nil {
+		return err
+	}
+	return yaml.Unmarshal([]byte(text), dst)
+}
diff --git a/pkg/log/pattern.go b/pkg/log/pattern.go
index 804151d39..6e9a515da 100644
--- a/pkg/log/pattern.go
+++ b/pkg/log/pattern.go
@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"io"
 	"path"
-	"runtime"
 	"strings"
 	"sync"
 	"time"
@@ -111,16 +110,16 @@ func keyFactory(key string) func(map[string]interface{}) string {
 	}
 }
 
-func longSource(map[string]interface{}) string {
-	if _, file, lineNo, ok := runtime.Caller(6); ok {
-		return fmt.Sprintf("%s:%d", file, lineNo)
+func longSource(d map[string]interface{}) string {
+	if fn, ok := d[_source].(string); ok {
+		return fn
 	}
 	return "unknown:0"
 }
 
-func shortSource(map[string]interface{}) string {
-	if _, file, lineNo, ok := runtime.Caller(6); ok {
-		return fmt.Sprintf("%s:%d", path.Base(file), lineNo)
+func shortSource(d map[string]interface{}) string {
+	if fn, ok := d[_source].(string); ok {
+		return path.Base(fn)
 	}
 	return "unknown:0"
 }