fix proto codec

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-#go get github.com/psampaz/go-mod-outdated@v0.6.0
-go list -u -m -mod=mod -json all | go-mod-outdated -update -direct -ci || true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-#go list -u -m -json all | go-mod-outdated -update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/codeql-analysis.yml

@@ -0,0 +1,75 @@
+# 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 ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  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 repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      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@v1
+
+    # 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: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.github/workflows/dependabot-automerge.yml

@@ -0,0 +1,66 @@
+name: "prautomerge"
+
+on:
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  Dependabot-Automerge:
+    runs-on: ubuntu-latest
+    # Contains workaround to execute if dependabot updates the PR by checking for the base branch in the linked PR
+    # The the github.event.workflow_run.event value is 'push' and not 'pull_request'
+    # dont work with multiple workflows when last returns success
+    if: >-
+      github.event.workflow_run.conclusion == 'success'
+      && github.actor == 'dependabot[bot]'
+      && github.event.sender.login == 'dependabot[bot]'
+      && github.event.sender.type == 'Bot'
+      && (github.event.workflow_run.event == 'pull_request'
+          || (github.event.workflow_run.event == 'push' && github.event.workflow_run.pull_requests[0].base.ref == github.event.repository.default_branch ))
+    steps:
+      - name: Approve Changes and Merge changes if label 'dependencies' is set
+        uses: actions/github-script@v5
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            console.log(context.payload.workflow_run);
+            
+            var labelNames = await github.paginate(
+              github.issues.listLabelsOnIssue,
+              {
+                repo: context.repo.repo,
+                owner: context.repo.owner,
+                issue_number: context.payload.workflow_run.pull_requests[0].number,
+              },
+              (response) => response.data.map(
+                (label) => label.name
+              )
+            );
+
+            console.log(labelNames);
+
+            if (labelNames.includes('dependencies')) {
+              console.log('Found label');
+
+              await github.pulls.createReview({
+                repo: context.repo.repo,
+                owner: context.repo.owner,
+                pull_number: context.payload.workflow_run.pull_requests[0].number,
+                event: 'APPROVE'
+              });
+              console.log('Approved PR');
+
+              await github.pulls.merge({
+                repo: context.repo.repo,
+                owner: context.repo.owner,
+                pull_number: context.payload.workflow_run.pull_requests[0].number,
+              });
+
+              console.log('Merged PR');
+            }

go.mod

@@ -2,10 +2,8 @@ module github.com/unistack-org/micro-codec-segmentio/v3
 
 go 1.16
 
-//	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c
-
 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 v0.2.21
+	github.com/unistack-org/micro/v3 v3.7.4
+	google.golang.org/protobuf v1.27.1
 )

go.sum

@@ -1,28 +1,31 @@
-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=
+github.com/golang-jwt/jwt/v4 v4.0.0/go.mod h1:/xlHOz8bRuivTWchD4jCa+NbatV+wEUSzwAxVc6locg=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
 github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
-github.com/klauspost/cpuid/v2 v2.0.5 h1:qnfhwbFriwDIX51QncuNU5mEMf+6KE3t7O8V2KQl3Dg=
-github.com/klauspost/cpuid/v2 v2.0.5/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
+github.com/klauspost/cpuid/v2 v2.0.6 h1:dQ5ueTiftKxp0gyjKSx5+8BtPWkyQbd95m8Gys/RarI=
+github.com/klauspost/cpuid/v2 v2.0.6/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
 github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
-github.com/segmentio/encoding v0.2.17 h1:cgfmPc44u1po1lz5bSgF00gLCROBjDNc7h+H7I20zpc=
-github.com/segmentio/encoding v0.2.17/go.mod h1:7E68jTSWMnNoYhHi1JbLd7NBSB6XfE4vzqhR88hDBQc=
+github.com/segmentio/asm v1.0.1 h1:g9VK62hXylgXI4yJV+dLTu/1j7kTxG9bkUSYBxL9dpg=
+github.com/segmentio/asm v1.0.1/go.mod h1:4EUJGaKsB8ImLUwOGORVsNd9vTRDeh44JGsY4aKp5I4=
+github.com/segmentio/encoding v0.2.21 h1:hlRQz3Pv+/mBj+jqr46TVqqv6AuTwvP5aAxQ0Usd4gY=
+github.com/segmentio/encoding v0.2.21/go.mod h1:kF1db1oBuYxMvLR3RXrZJchRdBKrS+1J/hL63p5hekI=
 github.com/silas/dag v0.0.0-20210121180416-41cf55125c34/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
-github.com/unistack-org/micro/v3 v3.3.13 h1:y4bDDkbwnjgOckrhFkC6D/o42tr75X33UbrB+Ko0M68=
-github.com/unistack-org/micro/v3 v3.3.13/go.mod h1:98hNcMXp/WyWJwLwCuwrhN1Jm7aCWaRNsMfRjK8Fq+Y=
-golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
+github.com/unistack-org/micro-proto v0.0.9 h1:KrWLS4FUX7UAWNAilQf70uad6ZPf/0EudeddCXllRVc=
+github.com/unistack-org/micro-proto v0.0.9/go.mod h1:Cckwmzd89gvS7ThxzZp9kQR/EOdksFQcsTAtDDyKwrg=
+github.com/unistack-org/micro/v3 v3.7.4 h1:nRk7f58v0VsiW7aKL0UQaFCQxFoursHQLoWdeZ1RYbg=
+github.com/unistack-org/micro/v3 v3.7.4/go.mod h1:78vy7ggElJD+ayx8ruhJsY+SkGUupfR32LXrg1UObvg=
+golang.org/x/net v0.0.0-20210510120150-4163338589ed/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
+google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

json/codec_test.go

@@ -0,0 +1,50 @@
+package json
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/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`)
+	}
+}
+
+func TestReadBody(t *testing.T) {
+	s := &struct {
+		Name string
+	}{}
+	c := NewCodec()
+	b := bytes.NewReader(nil)
+	err := c.ReadBody(b, s)
+	if err != nil {
+		t.Fatal(err)
+	}
+}

json/json.go

@@ -3,27 +3,36 @@ package json
 
 import (
 	"io"
-	"io/ioutil"
 
 	"github.com/segmentio/encoding/json"
 	"github.com/unistack-org/micro/v3/codec"
+	rutil "github.com/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{}
+
+const (
+	flattenTag = "flatten"
+)
+
+type JsonMarshalOptions struct {
 	EscapeHTML      bool
 	SortMapKeys     bool
 	TrustRawMessage bool
 }
 
-type Unmarshaler struct {
+type JsonUnmarshalOptions struct {
 	DisallowUnknownFields                bool
 	DontCopyNumber                       bool
 	DontCopyRawMessage                   bool
@@ -34,37 +43,121 @@ 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:
+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
-	case *codec.Frame:
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, err := rutil.StructFieldByTag(v, options.TagName, flattenTag); err == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
 		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
 	}
-	switch m := v.(type) {
-	case nil:
-		return nil
-	case *codec.Frame:
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, err := rutil.StructFieldByTag(v, options.TagName, flattenTag); err == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
 		m.Data = b
 		return nil
 	}
 
-	_, err := json.Parse(b, v, c.decodeFlags)
+	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
 }
 
@@ -72,85 +165,40 @@ func (c *jsonCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.Message
 	return nil
 }
 
-func (c *jsonCodec) ReadBody(conn io.Reader, b interface{}) error {
-	switch m := b.(type) {
-	case nil:
+func (c *jsonCodec) ReadBody(conn io.Reader, v interface{}) error {
+	if v == nil {
 		return nil
-	case *codec.Frame:
-		buf, err := ioutil.ReadAll(conn)
+	}
+
+	buf, err := io.ReadAll(conn)
 	if err != nil {
 		return err
+	} else if len(buf) == 0 {
+		return nil
 	}
-		m.Data = buf
+	return c.Unmarshal(buf, v)
+}
+
+func (c *jsonCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
+	if v == nil {
 		return nil
 	}
 
-	err := json.NewDecoder(conn).Decode(b)
-	if err == io.EOF {
-		return nil
-	}
+	buf, err := c.Marshal(v)
+	if err != nil {
 		return err
+	} else if len(buf) == 0 {
+		return codec.ErrInvalidMessage
 	}
 
-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)
+	_, err = conn.Write(buf)
 	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
-	}
-
-	if JsonMarshaler.SortMapKeys {
-		encodeFlags |= json.SortMapKeys
-	}
-
-	if JsonMarshaler.TrustRawMessage {
-		encodeFlags |= json.TrustRawMessage
-	}
-
-	if JsonUnmarshaler.DisallowUnknownFields {
-		decodeFlags |= json.DisallowUnknownFields
-	}
-
-	if JsonUnmarshaler.DontCopyNumber {
-		decodeFlags |= json.DontCopyNumber
-	}
-
-	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}
+func NewCodec(opts ...codec.Option) *jsonCodec {
+	return &jsonCodec{opts: codec.NewOptions(opts...)}
 }

json/options.go

@@ -0,0 +1,17 @@
+package json
+
+import (
+	codec "github.com/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 +1,51 @@
+package proto
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/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`)
+	}
+}
+
+func TestReadBody(t *testing.T) {
+	t.Skip("no proto generated")
+	s := &struct {
+		Name string
+	}{}
+	c := NewCodec()
+	b := bytes.NewReader(nil)
+	err := c.ReadBody(b, s)
+	if err != nil {
+		t.Fatal(err)
+	}
+}

proto/proto.go

@@ -3,94 +3,118 @@ package proto
 
 import (
 	"io"
-	"io/ioutil"
 
 	"github.com/segmentio/encoding/proto"
 	"github.com/unistack-org/micro/v3/codec"
+	rutil "github.com/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{}
+
+const (
+	flattenTag = "flatten"
+)
+
+func (c *protoCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
+	if v == nil {
 		return nil, nil
-	case *codec.Frame:
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, nerr := rutil.StructFieldByTag(v, options.TagName, flattenTag); nerr == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
 		return m.Data, nil
-	case newproto.Message, proto.Message:
+	}
+
+	switch m := v.(type) {
+	case proto.Message:
+		return proto.Marshal(m)
+	case newproto.Message:
 		return proto.Marshal(m)
 	}
+
 	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
 	}
-	switch m := v.(type) {
-	case nil:
-		return nil
-	case *codec.Frame:
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, nerr := rutil.StructFieldByTag(v, options.TagName, flattenTag); nerr == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
 		m.Data = d
-	case newproto.Message, proto.Message:
-		err = proto.Unmarshal(d, m)
-	default:
-		err = codec.ErrInvalidMessage
+		return nil
 	}
-	return err
+
+	switch m := v.(type) {
+	case proto.Message:
+		return proto.Unmarshal(d, m)
+	case newproto.Message:
+		return proto.Unmarshal(d, m)
+
+	}
+
+	return codec.ErrInvalidMessage
 }
 
 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:
+func (c *protoCodec) ReadBody(conn io.Reader, v interface{}) error {
+	if v == nil {
 		return nil
-	case *codec.Frame:
-		buf, err := ioutil.ReadAll(conn)
+	}
+	buf, err := io.ReadAll(conn)
 	if err != nil {
 		return err
-		}
-		m.Data = buf
+	} else if len(buf) == 0 {
 		return nil
-	case newproto.Message, proto.Message:
-		buf, err := ioutil.ReadAll(conn)
+	}
+	return c.Unmarshal(buf, v)
+}
+
+func (c *protoCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
+	if v == nil {
+		return nil
+	}
+
+	buf, err := c.Marshal(v)
 	if err != nil {
 		return err
-		} else if buf == nil {
-			return nil
-		}
-		return proto.Unmarshal(buf, m)
-	}
+	} else if len(buf) == 0 {
 		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...)}
 }