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// Copyright 2015 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 invoke
import (
"fmt"
"os"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/version"
)
func ExecPluginWithResult(pluginPath string, netconf []byte, args CNIArgs) (types.Result, error) {
return defaultPluginExec.WithResult(pluginPath, netconf, args)
}
func ExecPluginWithoutResult(pluginPath string, netconf []byte, args CNIArgs) error {
return defaultPluginExec.WithoutResult(pluginPath, netconf, args)
}
func GetVersionInfo(pluginPath string) (version.PluginInfo, error) {
return defaultPluginExec.GetVersionInfo(pluginPath)
}
var defaultPluginExec = &PluginExec{
RawExec: &RawExec{Stderr: os.Stderr},
VersionDecoder: &version.PluginDecoder{},
}
type PluginExec struct {
RawExec interface {
ExecPlugin(pluginPath string, stdinData []byte, environ []string) ([]byte, error)
}
VersionDecoder interface {
Decode(jsonBytes []byte) (version.PluginInfo, error)
}
}
func (e *PluginExec) WithResult(pluginPath string, netconf []byte, args CNIArgs) (types.Result, error) {
stdoutBytes, err := e.RawExec.ExecPlugin(pluginPath, netconf, args.AsEnv())
if err != nil {
return nil, err
}
// Plugin must return result in same version as specified in netconf
versionDecoder := &version.ConfigDecoder{}
confVersion, err := versionDecoder.Decode(netconf)
if err != nil {
return nil, err
}
return version.NewResult(confVersion, stdoutBytes)
}
func (e *PluginExec) WithoutResult(pluginPath string, netconf []byte, args CNIArgs) error {
_, err := e.RawExec.ExecPlugin(pluginPath, netconf, args.AsEnv())
return err
}
// GetVersionInfo returns the version information available about the plugin.
// For recent-enough plugins, it uses the information returned by the VERSION
// command. For older plugins which do not recognize that command, it reports
// version 0.1.0
func (e *PluginExec) GetVersionInfo(pluginPath string) (version.PluginInfo, error) {
args := &Args{
Command: "VERSION",
// set fake values required by plugins built against an older version of skel
NetNS: "dummy",
IfName: "dummy",
Path: "dummy",
}
stdin := []byte(fmt.Sprintf(`{"cniVersion":%q}`, version.Current()))
stdoutBytes, err := e.RawExec.ExecPlugin(pluginPath, stdin, args.AsEnv())
if err != nil {
if err.Error() == "unknown CNI_COMMAND: VERSION" {
return version.PluginSupports("0.1.0"), nil
}
return nil, err
}
return e.VersionDecoder.Decode(stdoutBytes)
}
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