修改死锁bug以及增加WriteTo接口 (#138)

1. 修改Set方法的死锁问题
2. 增加WriteTo方法，获取所有配置项

Author: ichiro999

archaius.go

@@ -5,6 +5,7 @@ package archaius
 import (
 	"errors"
 	"fmt"
+	"io"
 
 	filesource "github.com/go-chassis/go-archaius/source/file"
 
@@ -183,6 +184,11 @@ func UnmarshalConfig(obj interface{}) error {
 	return manager.Unmarshal(obj)
 }
 
+// WriteTo write the config to writer by yaml
+func WriteTo(w io.Writer) error {
+	return manager.Marshal(w)
+}
+
 // GetBool is gives the key value in the form of bool
 func GetBool(key string, defaultValue bool) bool {
 	b, err := GetValue(key).ToBool()

archaius_test.go

@@ -1,6 +1,7 @@
 package archaius_test
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"os"
@@ -227,6 +228,51 @@ infos_ptr:
 		assert.Equal(t, "123", p.MD["name"])
 	})
 }
+
+func TestMarshalConfig(t *testing.T) {
+	b := []byte(`
+info:
+  address: a
+metadata_str:
+  key01: "value01"
+metadata_int:
+  key01: 1
+metadata_struct:
+  key01: {address: "addr03",number: 1230}
+metadata_ptr:
+  key01: {address: "addr05",number: 1232}
+str_arr:
+  - "list01"
+int_arr:
+  - 1
+infos:
+  - address: "addr01"
+    users:
+      - name: "yourname"
+infos_ptr:
+  - number: 123
+    users:
+      - name: "yourname1"
+        age: 22
+`)
+	d, _ := os.Getwd()
+	filename1 := filepath.Join(d, "f4.yaml")
+	f1, err := os.Create(filename1)
+	assert.NoError(t, err)
+	err = archaius.Init(archaius.WithMemorySource())
+	assert.NoError(t, err)
+	defer f1.Close()
+	defer os.Remove(filename1)
+	_, err = io.WriteString(f1, string(b))
+	assert.NoError(t, err)
+	err = archaius.AddFile(filename1)
+	assert.NoError(t, err)
+	buf := bytes.NewBuffer(nil)
+	err = archaius.WriteTo(buf)
+	assert.NoError(t, err)
+	t.Logf("%s", buf.String())
+}
+
 func TestInitConfigCenter(t *testing.T) {
 	err := archaius.EnableRemoteSource("fake", nil)
 	assert.Error(t, err)

source/manager.go

@@ -24,6 +24,8 @@ package source
 import (
 	"errors"
 	"fmt"
+	"gopkg.in/yaml.v3"
+	"io"
 	"reflect"
 	"regexp"
 	"sync"
@@ -36,6 +38,7 @@ import (
 var (
 	ErrKeyNotExist = errors.New("key does not exist")
 	ErrIgnoreChange = errors.New("ignore key changed")
+	ErrWriterInvalid = errors.New("writer is invalid")
 )
 
 //const
@@ -82,7 +85,7 @@ func (m *Manager) Cleanup() error {
 //Set call set of all sources
 func (m *Manager) Set(k string, v interface{}) error {
 	m.sourceMapMux.RLock()
-	defer m.sourceMapMux.RLock()
+	defer m.sourceMapMux.RUnlock()
 	var err error
 	for _, s := range m.Sources {
 		err = s.Set(k, v)
@@ -128,6 +131,28 @@ func (m *Manager) Unmarshal(obj interface{}) error {
 	return m.unmarshal(rv, doNotConsiderTag)
 }
 
+// Marshal function is used to write all configuration by yaml
+func (m *Manager) Marshal(w io.Writer) error {
+	if w == nil {
+		openlog.Error("invalid writer")
+		return ErrWriterInvalid
+	}
+	allConfig := make(map[string]map[string]interface{})
+	for name, source := range m.Sources {
+		config, err :=  source.GetConfigurations()
+		if err != nil  {
+			openlog.Error("get source " + name + " error " + err.Error())
+			continue
+		}
+		if len(config) == 0 {
+			continue
+		}
+		allConfig[name] = config
+	}
+	encode := yaml.NewEncoder(w)
+	return encode.Encode(allConfig)
+}
+
 // AddSource adds a source to configurationManager
 func (m *Manager) AddSource(source ConfigSource) error {
 	if source == nil || source.GetSourceName() == "" {