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ipam_delegator.go
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ipam_delegator.go
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// Copyright 2019 Antrea 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 ipam
import (
"context"
"os"
"path/filepath"
"github.com/containernetworking/cni/pkg/invoke"
"github.com/containernetworking/cni/pkg/types"
current "github.com/containernetworking/cni/pkg/types/100"
"k8s.io/klog/v2"
argtypes "antrea.io/antrea/pkg/agent/cniserver/types"
)
const (
ipamHostLocal = "host-local"
defaultCNIPath = "/opt/cni/bin"
)
type IPAMDelegator struct {
pluginType string
}
var (
// Declare these two functions as variable for test
execPluginWithResultFunc = invoke.ExecPluginWithResult
execPluginNoResultFunc = invoke.ExecPluginWithoutResult
)
func (d *IPAMDelegator) Add(args *invoke.Args, k8sArgs *argtypes.K8sArgs, networkConfig []byte) (bool, *IPAMResult, error) {
var success = false
defer func() {
if !success {
// Rollback to delete assigned network configuration for failed to execute Add operation
args.Command = "DEL"
if err := delegateNoResult(d.pluginType, networkConfig, args); err != nil {
klog.Errorf("Failed to roll back to delete configuration %s, %v", string(networkConfig), err)
}
}
}()
args.Command = "ADD"
r, err := delegateWithResult(d.pluginType, networkConfig, args)
if err != nil {
return true, nil, err
}
ipamResult, err := current.NewResultFromResult(r)
if err != nil {
return true, nil, err
}
success = true
// IPAM Delegator always owns the request
return true, &IPAMResult{Result: *ipamResult}, nil
}
func (d *IPAMDelegator) Del(args *invoke.Args, k8sArgs *argtypes.K8sArgs, networkConfig []byte) (bool, error) {
args.Command = "DEL"
if err := delegateNoResult(d.pluginType, networkConfig, args); err != nil {
return true, err
}
// IPAM Delegator always owns the request
return true, nil
}
func (d *IPAMDelegator) Check(args *invoke.Args, k8sArgs *argtypes.K8sArgs, networkConfig []byte) (bool, error) {
args.Command = "CHECK"
if err := delegateNoResult(d.pluginType, networkConfig, args); err != nil {
return true, err
}
return true, nil
}
var defaultExec invoke.Exec = &invoke.DefaultExec{
RawExec: &invoke.RawExec{Stderr: os.Stderr},
}
func delegateCommon(delegatePlugin string, exec invoke.Exec, cniPath string) (string, invoke.Exec, error) {
// The CNI searching paths passed from kubelet.
configuredPaths := filepath.SplitList(cniPath)
paths := make([]string, len(configuredPaths)+1)
// When Antrea agent runs as a Pod, the IPAM plugin is always installed in
// defaultCNIPath, but kubelet can be configured to use different paths to
// search for CNI plugins. So here we always add defaultCNIPath to the CNI
// plugin searching paths to make sure the IPAM plugin installed in the agent
// Pod can be found.
paths[0] = defaultCNIPath
copy(paths[1:], configuredPaths)
pluginPath, err := exec.FindInPath(delegatePlugin, paths)
if err != nil {
return "", nil, err
}
return pluginPath, exec, nil
}
func delegateWithResult(delegatePlugin string, networkConfig []byte, args *invoke.Args) (types.Result, error) {
ctx := context.TODO()
pluginPath, realExec, err := delegateCommon(delegatePlugin, defaultExec, args.Path)
if err != nil {
return nil, err
}
return execPluginWithResultFunc(ctx, pluginPath, networkConfig, args, realExec)
}
func delegateNoResult(delegatePlugin string, networkConfig []byte, args *invoke.Args) error {
ctx := context.TODO()
pluginPath, realExec, err := delegateCommon(delegatePlugin, defaultExec, args.Path)
if err != nil {
return err
}
return execPluginNoResultFunc(ctx, pluginPath, networkConfig, args, realExec)
}
func init() {
RegisterIPAMDriver(ipamHostLocal, &IPAMDelegator{pluginType: ipamHostLocal})
}