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api.go
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api.go
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// Copyright 2019 Authors of Cilium
//
// 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 api
import (
"context"
"fmt"
"github.com/cilium/cilium/pkg/client"
"github.com/cilium/cilium/pkg/lock"
"github.com/cilium/cilium/plugins/cilium-cni/types"
"github.com/containernetworking/cni/pkg/skel"
cniTypesVer "github.com/containernetworking/cni/pkg/types/current"
"github.com/sirupsen/logrus"
)
var (
chainingPlugins = map[string]ChainingPlugin{}
mutex lock.RWMutex
)
// PluginContext is the context given to chaining plugins
type PluginContext struct {
Logger *logrus.Entry
Args *skel.CmdArgs
CniArgs types.ArgsSpec
NetConf *types.NetConf
Client *client.Client
}
// ChainingPlugin is the interface each chaining plugin must implement
type ChainingPlugin interface {
// Add is called on CNI ADD. It is given the plugin context from the
// previous plugin. It must return a CNI result or an error.
Add(ctx context.Context, pluginContext PluginContext) (res *cniTypesVer.Result, err error)
// ImplementsAdd returns true if the chaining plugin implements its own
// add logic
ImplementsAdd() bool
// Delete is called on CNI DELETE. It is given the plugin context from
// the previous plugin.
Delete(ctx context.Context, pluginContext PluginContext) (err error)
// ImplementsDelete returns true if the chaining plugin implements its
// own delete logic
ImplementsDelete() bool
}
// Register is called by chaining plugins to register themselves. After
// Register(), the plugin can be found with Lookup().
func Register(name string, p ChainingPlugin) error {
mutex.Lock()
defer mutex.Unlock()
if _, ok := chainingPlugins[name]; ok {
return fmt.Errorf("chaining plugin with name %s already exists", name)
}
chainingPlugins[name] = p
return nil
}
// Lookup searches for a chaining plugin with a given name and returns it
func Lookup(name string) ChainingPlugin {
mutex.RLock()
defer mutex.RUnlock()
return chainingPlugins[name]
}