Add cniVersion to Result

Signed-off-by: Pengfei Ni <feiskyer@gmail.com>

pkg/types/020/types.go

@@ -23,9 +23,9 @@ import (
 	"github.com/containernetworking/cni/pkg/types"
 )
 
-const implementedSpecVersion string = "0.2.0"
+const ImplementedSpecVersion string = "0.2.0"
 
-var SupportedVersions = []string{"", "0.1.0", implementedSpecVersion}
+var SupportedVersions = []string{"", "0.1.0", ImplementedSpecVersion}
 
 // Compatibility types for CNI version 0.1.0 and 0.2.0
 
@@ -39,7 +39,7 @@ func NewResult(data []byte) (types.Result, error) {
 
 func GetResult(r types.Result) (*Result, error) {
 	// We expect version 0.1.0/0.2.0 results
-	result020, err := r.GetAsVersion(implementedSpecVersion)
+	result020, err := r.GetAsVersion(ImplementedSpecVersion)
 	if err != nil {
 		return nil, err
 	}
@@ -52,18 +52,20 @@ func GetResult(r types.Result) (*Result, error) {
 
 // Result is what gets returned from the plugin (via stdout) to the caller
 type Result struct {
+	CNIVersion string    `json:"cniVersion,omitempty"`
 	IP4        *IPConfig `json:"ip4,omitempty"`
 	IP6        *IPConfig `json:"ip6,omitempty"`
 	DNS        types.DNS `json:"dns,omitempty"`
 }
 
 func (r *Result) Version() string {
-	return implementedSpecVersion
+	return ImplementedSpecVersion
 }
 
 func (r *Result) GetAsVersion(version string) (types.Result, error) {
 	for _, supportedVersion := range SupportedVersions {
 		if version == supportedVersion {
+			r.CNIVersion = version
 			return r, nil
 		}
 	}

pkg/types/020/types_test.go

@@ -48,6 +48,7 @@ var _ = Describe("Ensures compatibility with the 0.1.0/0.2.0 spec", func() {
 
 		// Set every field of the struct to ensure source compatibility
 		res := types020.Result{
+			CNIVersion: types020.ImplementedSpecVersion,
 			IP4: &types020.IPConfig{
 				IP:      *ipv4,
 				Gateway: net.ParseIP("1.2.3.1"),
@@ -88,6 +89,7 @@ var _ = Describe("Ensures compatibility with the 0.1.0/0.2.0 spec", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		Expect(string(out)).To(Equal(`{
+    "cniVersion": "0.2.0",
     "ip4": {
         "ip": "1.2.3.30/24",
         "gateway": "1.2.3.1",

pkg/types/current/types.go

@@ -63,6 +63,7 @@ func convertFrom020(result types.Result) (*Result, error) {
 	}
 
 	newResult := &Result{
+		CNIVersion: implementedSpecVersion,
 		DNS:        oldResult.DNS,
 		Routes:     []*types.Route{},
 	}
@@ -117,6 +118,7 @@ func convertFrom030(result types.Result) (*Result, error) {
 	if !ok {
 		return nil, fmt.Errorf("failed to convert result")
 	}
+	newResult.CNIVersion = implementedSpecVersion
 	return newResult, nil
 }
 
@@ -134,6 +136,7 @@ func NewResultFromResult(result types.Result) (*Result, error) {
 
 // Result is what gets returned from the plugin (via stdout) to the caller
 type Result struct {
+	CNIVersion string         `json:"cniVersion,omitempty"`
 	Interfaces []*Interface   `json:"interfaces,omitempty"`
 	IPs        []*IPConfig    `json:"ips,omitempty"`
 	Routes     []*types.Route `json:"routes,omitempty"`
@@ -143,6 +146,7 @@ type Result struct {
 // Convert to the older 0.2.0 CNI spec Result type
 func (r *Result) convertTo020() (*types020.Result, error) {
 	oldResult := &types020.Result{
+		CNIVersion: types020.ImplementedSpecVersion,
 		DNS:        r.DNS,
 	}
 
@@ -195,6 +199,7 @@ func (r *Result) Version() string {
 func (r *Result) GetAsVersion(version string) (types.Result, error) {
 	switch version {
 	case "0.3.0", implementedSpecVersion:
+		r.CNIVersion = version
 		return r, nil
 	case types020.SupportedVersions[0], types020.SupportedVersions[1], types020.SupportedVersions[2]:
 		return r.convertTo020()

pkg/types/current/types_test.go

@@ -47,6 +47,7 @@ func testResult() *current.Result {
 
 	// Set every field of the struct to ensure source compatibility
 	return &current.Result{
+		CNIVersion: "0.3.1",
 		Interfaces: []*current.Interface{
 			{
 				Name:    "eth0",
@@ -103,6 +104,7 @@ var _ = Describe("Current types operations", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		Expect(string(out)).To(Equal(`{
+    "cniVersion": "0.3.1",
     "interfaces": [
         {
             "name": "eth0",
@@ -172,6 +174,7 @@ var _ = Describe("Current types operations", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		Expect(string(out)).To(Equal(`{
+    "cniVersion": "0.1.0",
     "ip4": {
         "ip": "1.2.3.30/24",
         "gateway": "1.2.3.1",