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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 legacy_examples
// An ExampleRuntime is a small program that uses libcni to invoke a network plugin.
// It should call ADD and DELETE, verifying all intermediate steps
// and data structures.
type ExampleRuntime struct {
Example
NetConfs []string // The network configuration names to pass
}
// NetConfs are various versioned network configuration files. Examples should
// specify which version they expect
var NetConfs = map[string]string{
"unversioned": `{
"name": "default",
"type": "ptp",
"ipam": {
"type": "host-local",
"subnet": "10.1.2.0/24"
}
}`,
"0.1.0": `{
"cniVersion": "0.1.0",
"name": "default",
"type": "ptp",
"ipam": {
"type": "host-local",
"subnet": "10.1.2.0/24"
}
}`,
}
// V010_Runtime creates a simple ptp network configuration, then
// executes libcni against the currently-built plugins.
var V010_Runtime = ExampleRuntime{
NetConfs: []string{"unversioned", "0.1.0"},
Example: Example{
Name: "example_invoker_v010",
CNIRepoGitRef: "c0d34c69", //version with ns.Do
PluginSource: `package main
import (
"fmt"
"io/ioutil"
"net"
"os"
"github.com/containernetworking/cni/pkg/ns"
"github.com/containernetworking/cni/libcni"
)
func main(){
code := exec()
os.Exit(code)
}
func exec() int {
confBytes, err := ioutil.ReadAll(os.Stdin)
if err != nil {
fmt.Printf("could not read netconfig from stdin: %+v", err)
return 1
}
netConf, err := libcni.ConfFromBytes(confBytes)
if err != nil {
fmt.Printf("could not parse netconfig: %+v", err)
return 1
}
fmt.Printf("Parsed network configuration: %+v\n", netConf.Network)
if len(os.Args) == 1 {
fmt.Printf("Expect CNI plugin paths in argv")
return 1
}
targetNs, err := ns.NewNS()
if err != nil {
fmt.Printf("Could not create ns: %+v", err)
return 1
}
defer targetNs.Close()
ifName := "eth0"
runtimeConf := &libcni.RuntimeConf{
ContainerID: "some-container-id",
NetNS: targetNs.Path(),
IfName: ifName,
}
cniConfig := &libcni.CNIConfig{Path: os.Args[1:]}
result, err := cniConfig.AddNetwork(netConf, runtimeConf)
if err != nil {
fmt.Printf("AddNetwork failed: %+v", err)
return 2
}
fmt.Printf("AddNetwork result: %+v", result)
expectedIP := result.IP4.IP
err = targetNs.Do(func(ns.NetNS) error {
netif, err := net.InterfaceByName(ifName)
if err != nil {
return fmt.Errorf("could not retrieve interface: %v", err)
}
addrs, err := netif.Addrs()
if err != nil {
return fmt.Errorf("could not retrieve addresses, %+v", err)
}
found := false
for _, addr := range addrs {
if addr.String() == expectedIP.String() {
found = true
break
}
}
if !found {
return fmt.Errorf("Far-side link did not have expected address %s", expectedIP)
}
return nil
})
if err != nil {
fmt.Println(err)
return 4
}
err = cniConfig.DelNetwork(netConf, runtimeConf)
if err != nil {
fmt.Printf("DelNetwork failed: %v", err)
return 5
}
err = targetNs.Do(func(ns.NetNS) error {
_, err := net.InterfaceByName(ifName)
if err == nil {
return fmt.Errorf("interface was not deleted")
}
return nil
})
if err != nil {
fmt.Println(err)
return 6
}
return 0
}
`,
},
}
|
