update to latest micro, optimize flatten

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.github/dependabot.yml

@@ -0,0 +1,19 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+
+  # Maintain dependencies for Golang
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/renovate.json

@@ -1,20 +0,0 @@
-{
-  "extends": [
-    "config:base"
-  ],
-  "postUpdateOptions": ["gomodTidy"],
-  "packageRules": [
-    {
-      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
-      "automerge": true
-    },
-    {
-      "groupName": "all deps",
-      "separateMajorMinor": true,
-      "groupSlug": "all",
-      "packagePatterns": [
-        "*"
-      ]
-    }
-  ]
-}

.github/stale.sh

@@ -1,13 +0,0 @@
-#!/bin/bash -ex
-
-export PATH=$PATH:$(pwd)/bin
-export GO111MODULE=on
-export GOBIN=$(pwd)/bin
-
-#go get github.com/rvflash/goup@v0.4.1
-
-#goup -v ./...
-#go get github.com/psampaz/go-mod-outdated@v0.6.0
-go list -u -m -mod=mod -json all | go-mod-outdated -update -direct -ci || true
-
-#go list -u -m -json all | go-mod-outdated -update

.github/workflows/autoapprove.yml

@@ -0,0 +1,20 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        uses: hmarr/auto-approve-action@v3
+        if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/automerge.yml

@@ -0,0 +1,21 @@
+name: "automerge"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.actor == 'vtolstov'
+    steps:
+      - name: merge
+        id: merge
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/build.yml

@@ -3,19 +3,20 @@ on:
  push:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,78 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "codeql"
+
+on:
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+  push:
+    branches: [ master, v3 ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master, v3 ]
+  schedule:
+    - cron: '34 1 * * 0'
+
+jobs:
+  analyze:
+    name: analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: setup
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.17
+    # Initializes the CodeQL tools for scanning.
+    - name: init
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: analyze
+      uses: github/codeql-action/analyze@v2

.github/workflows/dependabot-automerge.yml

@@ -0,0 +1,27 @@
+name: "dependabot-automerge"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]'
+    steps:
+      - name: metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1.3.6
+        with:
+          github-token: "${{ secrets.TOKEN }}"
+      - name: merge
+        id: merge
+        if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/pr.yml

@@ -3,19 +3,20 @@ on:
   pull_request:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

README.md

@@ -0,0 +1 @@
+# micro-codec-segmentio

go.mod

@@ -1,11 +1,16 @@
-module github.com/unistack-org/micro-codec-segmentio/v3
+module go.unistack.org/micro-codec-segmentio/v3
 
-go 1.16
-
-//	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c
+go 1.19
 
 require (
-	github.com/segmentio/encoding v0.2.17
-	github.com/unistack-org/micro/v3 v3.3.13
-	google.golang.org/protobuf v1.26.0
+	github.com/segmentio/encoding v0.4.0
+	go.unistack.org/micro-proto/v3 v3.4.1
+	go.unistack.org/micro/v3 v3.10.88
+	google.golang.org/protobuf v1.34.2
+)
+
+require (
+	github.com/google/go-cmp v0.5.7 // indirect
+	github.com/segmentio/asm v1.2.0 // indirect
+	golang.org/x/sys v0.25.0 // indirect
 )

go.sum

@@ -1,28 +1,172 @@
-github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
-github.com/ef-ds/deque v1.0.4/go.mod h1:gXDnTC3yqvBcHbq2lcExjtAcVrOnJCbMcZXmuj8Z4tg=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
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+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
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json/codec_test.go

@@ -0,0 +1,38 @@
+package json
+
+import (
+	"bytes"
+	"testing"
+
+	"go.unistack.org/micro/v3/codec"
+)
+
+func TestFrame(t *testing.T) {
+	s := &codec.Frame{Data: []byte("test")}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
+func TestFrameFlatten(t *testing.T) {
+	s := &struct {
+		One  string
+		Name *codec.Frame `json:"name" codec:"flatten"`
+	}{
+		One:  "xx",
+		Name: &codec.Frame{Data: []byte("test")},
+	}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}

json/json.go

@@ -1,29 +1,36 @@
 // Package json provides a json codec
-package json
+package json // import "go.unistack.org/micro-codec-segmentio/v3/json"
 
 import (
-	"io"
-	"io/ioutil"
-
 	"github.com/segmentio/encoding/json"
-	"github.com/unistack-org/micro/v3/codec"
+	pb "go.unistack.org/micro-proto/v3/codec"
+	"go.unistack.org/micro/v3/codec"
+	rutil "go.unistack.org/micro/v3/util/reflect"
 )
 
 var (
-	JsonMarshaler = &Marshaler{}
+	DefaultMarshalOptions = JsonMarshalOptions{
+		EscapeHTML:  true,
+		SortMapKeys: true,
+	}
 
-	JsonUnmarshaler = &Unmarshaler{
+	DefaultUnmarshalOptions = JsonUnmarshalOptions{
 		ZeroCopy: true,
 	}
 )
 
-type Marshaler struct {
+var (
+	_ codec.Codec   = (*jsonCodec)()
+	_ codec.CodecV2 = (*jsonCodecV2)()
+)
+
+type JsonMarshalOptions struct {
 	EscapeHTML      bool
 	SortMapKeys     bool
 	TrustRawMessage bool
 }
 
-type Unmarshaler struct {
+type JsonUnmarshalOptions struct {
 	DisallowUnknownFields                bool
 	DontCopyNumber                       bool
 	DontCopyRawMessage                   bool
@@ -34,123 +41,224 @@ type Unmarshaler struct {
 }
 
 type jsonCodec struct {
+	opts        codec.Options
 	encodeFlags json.AppendFlags
 	decodeFlags json.ParseFlags
 }
 
-func (c *jsonCodec) Marshal(b interface{}) ([]byte, error) {
-	switch m := b.(type) {
-	case nil:
+type jsonCodecV2 struct {
+	opts        codec.Options
+	encodeFlags json.AppendFlags
+	decodeFlags json.ParseFlags
+}
+
+func getMarshalFlags(o JsonMarshalOptions) json.AppendFlags {
+	var encodeFlags json.AppendFlags
+
+	if o.EscapeHTML {
+		encodeFlags |= json.EscapeHTML
+	}
+
+	if o.SortMapKeys {
+		encodeFlags |= json.SortMapKeys
+	}
+
+	if o.TrustRawMessage {
+		encodeFlags |= json.TrustRawMessage
+	}
+
+	return encodeFlags
+}
+
+func getUnmarshalFlags(o JsonUnmarshalOptions) json.ParseFlags {
+	var decodeFlags json.ParseFlags
+
+	if o.DisallowUnknownFields {
+		decodeFlags |= json.DisallowUnknownFields
+	}
+
+	if o.DontCopyNumber {
+		decodeFlags |= json.DontCopyNumber
+	}
+
+	if o.DontCopyRawMessage {
+		decodeFlags |= json.DontCopyRawMessage
+	}
+
+	if o.DontCopyString {
+		decodeFlags |= json.DontCopyString
+	}
+
+	if o.DontMatchCaseInsensitiveStructFields {
+		decodeFlags |= json.DontMatchCaseInsensitiveStructFields
+	}
+
+	if o.UseNumber {
+		decodeFlags |= json.UseNumber
+	}
+
+	if o.ZeroCopy {
+		decodeFlags |= json.ZeroCopy
+	}
+
+	return decodeFlags
+}
+
+func (c *jsonCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
+	if v == nil {
 		return nil, nil
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if options.Flatten {
+		if nv, err := rutil.StructFieldByTag(v, options.TagName, "flatten"); err == nil {
+			v = nv
+		}
+	}
+
+	switch m := v.(type) {
 	case *codec.Frame:
 		return m.Data, nil
+	case *pb.Frame:
+		return m.Data, nil
+	}
+
+	marshalOptions := DefaultMarshalOptions
+	if options.Context != nil {
+		if f, ok := options.Context.Value(marshalOptionsKey{}).(JsonMarshalOptions); ok {
+			marshalOptions = f
+		}
 	}
 
 	var err error
 	var buf []byte
-	buf, err = json.Append(buf, b, c.encodeFlags)
+	buf, err = json.Append(buf, v, getMarshalFlags(marshalOptions))
 	return buf, err
 }
 
-func (c *jsonCodec) Unmarshal(b []byte, v interface{}) error {
-	if b == nil {
+func (c *jsonCodec) Unmarshal(b []byte, v interface{}, opts ...codec.Option) error {
+	if len(b) == 0 || v == nil {
 		return nil
 	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if options.Flatten {
+		if nv, err := rutil.StructFieldByTag(v, options.TagName, "flatten"); err == nil {
+			v = nv
+		}
+	}
+
 	switch m := v.(type) {
-	case nil:
-		return nil
 	case *codec.Frame:
 		m.Data = b
 		return nil
+	case *pb.Frame:
+		m.Data = b
+		return nil
 	}
 
-	_, err := json.Parse(b, v, c.decodeFlags)
-	return err
-}
-
-func (c *jsonCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.MessageType) error {
-	return nil
-}
-
-func (c *jsonCodec) ReadBody(conn io.Reader, b interface{}) error {
-	switch m := b.(type) {
-	case nil:
-		return nil
-	case *codec.Frame:
-		buf, err := ioutil.ReadAll(conn)
-		if err != nil {
-			return err
+	unmarshalOptions := DefaultUnmarshalOptions
+	if options.Context != nil {
+		if f, ok := options.Context.Value(unmarshalOptionsKey{}).(JsonUnmarshalOptions); ok {
+			unmarshalOptions = f
 		}
-		m.Data = buf
-		return nil
 	}
 
-	err := json.NewDecoder(conn).Decode(b)
-	if err == io.EOF {
-		return nil
-	}
+	_, err := json.Parse(b, v, getUnmarshalFlags(unmarshalOptions))
 	return err
 }
 
-func (c *jsonCodec) Write(conn io.Writer, m *codec.Message, b interface{}) error {
-	switch m := b.(type) {
-	case nil:
-		return nil
-	case *codec.Frame:
-		_, err := conn.Write(m.Data)
-		return err
-	}
-
-	return json.NewEncoder(conn).Encode(b)
-}
-
 func (c *jsonCodec) String() string {
 	return "json"
 }
 
-func NewCodec() codec.Codec {
-	var encodeFlags json.AppendFlags
-	var decodeFlags json.ParseFlags
-
-	if JsonMarshaler.EscapeHTML {
-		encodeFlags |= json.EscapeHTML
+func (c *jsonCodecV2) Marshal(b []byte, v interface{}, opts ...codec.Option) ([]byte, error) {
+	if v == nil {
+		return nil, nil
 	}
 
-	if JsonMarshaler.SortMapKeys {
-		encodeFlags |= json.SortMapKeys
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
 	}
 
-	if JsonMarshaler.TrustRawMessage {
-		encodeFlags |= json.TrustRawMessage
+	if options.Flatten {
+		if nv, err := rutil.StructFieldByTag(v, options.TagName, "flatten"); err == nil {
+			v = nv
+		}
 	}
 
-	if JsonUnmarshaler.DisallowUnknownFields {
-		decodeFlags |= json.DisallowUnknownFields
+	switch m := v.(type) {
+	case *codec.Frame:
+		return m.Data, nil
+	case *pb.Frame:
+		return m.Data, nil
 	}
 
-	if JsonUnmarshaler.DontCopyNumber {
-		decodeFlags |= json.DontCopyNumber
+	marshalOptions := DefaultMarshalOptions
+	if options.Context != nil {
+		if f, ok := options.Context.Value(marshalOptionsKey{}).(JsonMarshalOptions); ok {
+			marshalOptions = f
+		}
 	}
 
-	if JsonUnmarshaler.DontCopyRawMessage {
-		decodeFlags |= json.DontCopyRawMessage
-	}
-
-	if JsonUnmarshaler.DontCopyString {
-		decodeFlags |= json.DontCopyString
-	}
-
-	if JsonUnmarshaler.DontMatchCaseInsensitiveStructFields {
-		decodeFlags |= json.DontMatchCaseInsensitiveStructFields
-	}
-
-	if JsonUnmarshaler.UseNumber {
-		decodeFlags |= json.UseNumber
-	}
-
-	if JsonUnmarshaler.ZeroCopy {
-		decodeFlags |= json.ZeroCopy
-	}
-
-	return &jsonCodec{encodeFlags: encodeFlags, decodeFlags: decodeFlags}
+	var err error
+	b, err = json.Append(b, v, getMarshalFlags(marshalOptions))
+	return b, err
+}
+
+func (c *jsonCodecV2) Unmarshal(b []byte, v interface{}, opts ...codec.Option) error {
+	if len(b) == 0 || v == nil {
+		return nil
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if options.Flatten {
+		if nv, err := rutil.StructFieldByTag(v, options.TagName, "flatten"); err == nil {
+			v = nv
+		}
+	}
+
+	switch m := v.(type) {
+	case *codec.Frame:
+		m.Data = b
+		return nil
+	case *pb.Frame:
+		m.Data = b
+		return nil
+	}
+
+	unmarshalOptions := DefaultUnmarshalOptions
+	if options.Context != nil {
+		if f, ok := options.Context.Value(unmarshalOptionsKey{}).(JsonUnmarshalOptions); ok {
+			unmarshalOptions = f
+		}
+	}
+
+	_, err := json.Parse(b, v, getUnmarshalFlags(unmarshalOptions))
+	return err
+}
+
+func (c *jsonCodecV2) String() string {
+	return "json"
+}
+
+func NewCodec(opts ...codec.Option) *jsonCodec {
+	return &jsonCodec{opts: codec.NewOptions(opts...)}
+}
+
+func NewCodecV2(opts ...codec.Option) *jsonCodecV2 {
+	return &jsonCodecV2{opts: codec.NewOptions(opts...)}
 }

json/options.go

@@ -0,0 +1,17 @@
+package json
+
+import (
+	codec "go.unistack.org/micro/v3/codec"
+)
+
+type unmarshalOptionsKey struct{}
+
+func UnmarshalOptions(o JsonUnmarshalOptions) codec.Option {
+	return codec.SetOption(unmarshalOptionsKey{}, o)
+}
+
+type marshalOptionsKey struct{}
+
+func MarshalOptions(o JsonMarshalOptions) codec.Option {
+	return codec.SetOption(marshalOptionsKey{}, o)
+}

proto/codec_test.go

@@ -0,0 +1,38 @@
+package proto
+
+import (
+	"bytes"
+	"testing"
+
+	"go.unistack.org/micro/v3/codec"
+)
+
+func TestFrame(t *testing.T) {
+	s := &codec.Frame{Data: []byte("test")}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
+func TestFrameFlatten(t *testing.T) {
+	s := &struct {
+		One  string
+		Name *codec.Frame `json:"name" codec:"flatten"`
+	}{
+		One:  "xx",
+		Name: &codec.Frame{Data: []byte("test")},
+	}
+
+	buf, err := NewCodec(codec.Flatten(true)).Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}

proto/proto.go

@@ -1,96 +1,92 @@
 // Package proto provides a proto codec
-package proto
+package proto // import "go.unistack.org/micro-codec-segmentio/v3/proto"
 
 import (
-	"io"
-	"io/ioutil"
-
 	"github.com/segmentio/encoding/proto"
-	"github.com/unistack-org/micro/v3/codec"
+	pb "go.unistack.org/micro-proto/v3/codec"
+	"go.unistack.org/micro/v3/codec"
+	rutil "go.unistack.org/micro/v3/util/reflect"
 	newproto "google.golang.org/protobuf/proto"
 )
 
-type protoCodec struct{}
+type protoCodec struct {
+	opts codec.Options
+}
 
-func (c *protoCodec) Marshal(v interface{}) ([]byte, error) {
-	switch m := v.(type) {
-	case nil:
+var _ codec.Codec = &protoCodec{}
+
+func (c *protoCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
+	if v == nil {
 		return nil, nil
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if options.Flatten {
+		if nv, nerr := rutil.StructFieldByTag(v, options.TagName, "flatten"); nerr == nil {
+			v = nv
+		}
+	}
+
+	switch m := v.(type) {
 	case *codec.Frame:
 		return m.Data, nil
-	case newproto.Message, proto.Message:
-		return proto.Marshal(m)
+	case *pb.Frame:
+		return m.Data, nil
+	}
+
+	switch m := v.(type) {
+	case proto.Message:
+		return proto.Marshal(m)
+	case newproto.Message:
+		return proto.Marshal(m)
+	default:
+		return nil, codec.ErrInvalidMessage
 	}
-	return nil, codec.ErrInvalidMessage
 }
 
-func (c *protoCodec) Unmarshal(d []byte, v interface{}) error {
-	var err error
-	if d == nil {
+func (c *protoCodec) Unmarshal(d []byte, v interface{}, opts ...codec.Option) error {
+	if v == nil || len(d) == 0 {
 		return nil
 	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if options.Flatten {
+		if nv, nerr := rutil.StructFieldByTag(v, options.TagName, "flatten"); nerr == nil {
+			v = nv
+		}
+	}
+
 	switch m := v.(type) {
-	case nil:
-		return nil
 	case *codec.Frame:
 		m.Data = d
-	case newproto.Message, proto.Message:
-		err = proto.Unmarshal(d, m)
+		return nil
+	case *pb.Frame:
+		m.Data = d
+		return nil
+	}
+
+	switch m := v.(type) {
+	case proto.Message:
+		return proto.Unmarshal(d, m)
+	case newproto.Message:
+		return proto.Unmarshal(d, m)
 	default:
-		err = codec.ErrInvalidMessage
+		return codec.ErrInvalidMessage
 	}
-	return err
-}
-
-func (c *protoCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.MessageType) error {
-	return nil
-}
-
-func (c *protoCodec) ReadBody(conn io.Reader, b interface{}) error {
-	switch m := b.(type) {
-	case nil:
-		return nil
-	case *codec.Frame:
-		buf, err := ioutil.ReadAll(conn)
-		if err != nil {
-			return err
-		}
-		m.Data = buf
-		return nil
-	case newproto.Message, proto.Message:
-		buf, err := ioutil.ReadAll(conn)
-		if err != nil {
-			return err
-		} else if buf == nil {
-			return nil
-		}
-		return proto.Unmarshal(buf, m)
-	}
-	return codec.ErrInvalidMessage
-}
-
-func (c *protoCodec) Write(conn io.Writer, m *codec.Message, b interface{}) error {
-	switch m := b.(type) {
-	case nil:
-		return nil
-	case *codec.Frame:
-		_, err := conn.Write(m.Data)
-		return err
-	case newproto.Message, proto.Message:
-		buf, err := proto.Marshal(m)
-		if err != nil {
-			return err
-		}
-		_, err = conn.Write(buf)
-		return err
-	}
-	return codec.ErrInvalidMessage
 }
 
 func (c *protoCodec) String() string {
 	return "proto"
 }
 
-func NewCodec() codec.Codec {
-	return &protoCodec{}
+func NewCodec(opts ...codec.Option) *protoCodec {
+	return &protoCodec{opts: codec.NewOptions(opts...)}
 }