feat(encoding): experimental yaml v3 library support

.github/workflows/ci.yml

@@ -17,6 +17,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         go: ['1.14', '1.15', '1.16', '1.17']
+        tags: ['', 'viper_yaml3']
     env:
       GOFLAGS: -mod=readonly
 
@@ -30,11 +31,11 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Test
-        run: go test -race -v ./...
+        run: go test -race -tags '${{ matrix.tags }}' -v ./...
         if: runner.os != 'Windows'
 
       - name: Test (without race detector)
-        run: go test -v ./...
+        run: go test -tags '${{ matrix.tags }}' -v ./...
         if: runner.os == 'Windows'
 
   lint:

go.mod

@@ -17,6 +17,7 @@ require (
 	github.com/subosito/gotenv v1.2.0
 	gopkg.in/ini.v1 v1.66.2
 	gopkg.in/yaml.v2 v2.4.0
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
 
 require (
@@ -65,5 +66,4 @@ require (
 	google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa // indirect
 	google.golang.org/grpc v1.43.0 // indirect
 	google.golang.org/protobuf v1.27.1 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )

internal/encoding/yaml/codec.go

@@ -1,6 +1,6 @@
 package yaml
 
-import "gopkg.in/yaml.v2"
+// import "gopkg.in/yaml.v2"
 
 // Codec implements the encoding.Encoder and encoding.Decoder interfaces for YAML encoding.
 type Codec struct{}

internal/encoding/yaml/yaml2.go

@@ -0,0 +1,14 @@
+//go:build !viper_yaml3
+// +build !viper_yaml3
+
+package yaml
+
+import yamlv2 "gopkg.in/yaml.v2"
+
+var yaml = struct {
+	Marshal   func(in interface{}) (out []byte, err error)
+	Unmarshal func(in []byte, out interface{}) (err error)
+}{
+	Marshal:   yamlv2.Marshal,
+	Unmarshal: yamlv2.Unmarshal,
+}

internal/encoding/yaml/yaml3.go

@@ -0,0 +1,14 @@
+//go:build viper_yaml3
+// +build viper_yaml3
+
+package yaml
+
+import yamlv3 "gopkg.in/yaml.v3"
+
+var yaml = struct {
+	Marshal   func(in interface{}) (out []byte, err error)
+	Unmarshal func(in []byte, out interface{}) (err error)
+}{
+	Marshal:   yamlv3.Marshal,
+	Unmarshal: yamlv3.Unmarshal,
+}