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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types020
import (
"encoding/json"
"fmt"
"io"
"net"
"os"
"github.com/containernetworking/cni/pkg/types"
convert "github.com/containernetworking/cni/pkg/types/internal"
)
const ImplementedSpecVersion string = "0.2.0"
var supportedVersions = []string{"", "0.1.0", ImplementedSpecVersion}
// Register converters for all versions less than the implemented spec version
func init() {
convert.RegisterConverter("0.1.0", []string{ImplementedSpecVersion}, convertFrom010)
convert.RegisterConverter(ImplementedSpecVersion, []string{"0.1.0"}, convertTo010)
// Creator
convert.RegisterCreator(supportedVersions, NewResult)
}
// Compatibility types for CNI version 0.1.0 and 0.2.0
// NewResult creates a new Result object from JSON data. The JSON data
// must be compatible with the CNI versions implemented by this type.
func NewResult(data []byte) (types.Result, error) {
result := &Result{}
if err := json.Unmarshal(data, result); err != nil {
return nil, err
}
for _, v := range supportedVersions {
if result.CNIVersion == v {
if result.CNIVersion == "" {
result.CNIVersion = "0.1.0"
}
return result, nil
}
}
return nil, fmt.Errorf("result type supports %v but unmarshalled CNIVersion is %q",
supportedVersions, result.CNIVersion)
}
// GetResult converts the given Result object to the ImplementedSpecVersion
// and returns the concrete type or an error
func GetResult(r types.Result) (*Result, error) {
result020, err := convert.Convert(r, ImplementedSpecVersion)
if err != nil {
return nil, err
}
result, ok := result020.(*Result)
if !ok {
return nil, fmt.Errorf("failed to convert result")
}
return result, nil
}
func convertFrom010(from types.Result, toVersion string) (types.Result, error) {
if toVersion != "0.2.0" {
panic("only converts to version 0.2.0")
}
fromResult := from.(*Result)
return &Result{
CNIVersion: ImplementedSpecVersion,
IP4: fromResult.IP4.Copy(),
IP6: fromResult.IP6.Copy(),
DNS: *fromResult.DNS.Copy(),
}, nil
}
func convertTo010(from types.Result, toVersion string) (types.Result, error) {
if toVersion != "0.1.0" {
panic("only converts to version 0.1.0")
}
fromResult := from.(*Result)
return &Result{
CNIVersion: "0.1.0",
IP4: fromResult.IP4.Copy(),
IP6: fromResult.IP6.Copy(),
DNS: *fromResult.DNS.Copy(),
}, nil
}
// 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 r.CNIVersion
}
func (r *Result) GetAsVersion(version string) (types.Result, error) {
// If the creator of the result did not set the CNIVersion, assume it
// should be the highest spec version implemented by this Result
if r.CNIVersion == "" {
r.CNIVersion = ImplementedSpecVersion
}
return convert.Convert(r, version)
}
func (r *Result) Print() error {
return r.PrintTo(os.Stdout)
}
func (r *Result) PrintTo(writer io.Writer) error {
data, err := json.MarshalIndent(r, "", " ")
if err != nil {
return err
}
_, err = writer.Write(data)
return err
}
// IPConfig contains values necessary to configure an interface
type IPConfig struct {
IP net.IPNet
Gateway net.IP
Routes []types.Route
}
func (i *IPConfig) Copy() *IPConfig {
if i == nil {
return nil
}
var routes []types.Route
for _, fromRoute := range i.Routes {
routes = append(routes, *fromRoute.Copy())
}
return &IPConfig{
IP: i.IP,
Gateway: i.Gateway,
Routes: routes,
}
}
// net.IPNet is not JSON (un)marshallable so this duality is needed
// for our custom IPNet type
// JSON (un)marshallable types
type ipConfig struct {
IP types.IPNet `json:"ip"`
Gateway net.IP `json:"gateway,omitempty"`
Routes []types.Route `json:"routes,omitempty"`
}
func (c *IPConfig) MarshalJSON() ([]byte, error) {
ipc := ipConfig{
IP: types.IPNet(c.IP),
Gateway: c.Gateway,
Routes: c.Routes,
}
return json.Marshal(ipc)
}
func (c *IPConfig) UnmarshalJSON(data []byte) error {
ipc := ipConfig{}
if err := json.Unmarshal(data, &ipc); err != nil {
return err
}
c.IP = net.IPNet(ipc.IP)
c.Gateway = ipc.Gateway
c.Routes = ipc.Routes
return nil
}
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