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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.
/*
Noop plugin is a CNI plugin designed for use as a test-double.
When calling, set the CNI_ARGS env var equal to the path of a file containing
the JSON encoding of a Debug.
*/
package main
import (
"errors"
"fmt"
"os"
"strings"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/version"
noop_debug "github.com/containernetworking/cni/plugins/test/noop/debug"
)
// parse extra args i.e. FOO=BAR;ABC=123
func parseExtraArgs(args string) (map[string]string, error) {
m := make(map[string]string)
items := strings.Split(args, ";")
for _, item := range items {
kv := strings.Split(item, "=")
if len(kv) != 2 {
return nil, fmt.Errorf("CNI_ARGS invalid key/value pair: %s\n", kv)
}
m[kv[0]] = kv[1]
}
return m, nil
}
func debugBehavior(args *skel.CmdArgs, command string) error {
extraArgs, err := parseExtraArgs(args.Args)
if err != nil {
return err
}
debugFilePath, ok := extraArgs["DEBUG"]
if !ok {
fmt.Printf(`{}`)
os.Stderr.WriteString("CNI_ARGS empty, no debug behavior\n")
return nil
}
debug, err := noop_debug.ReadDebug(debugFilePath)
if err != nil {
return err
}
debug.CmdArgs = *args
debug.Command = command
if debug.ReportResult == "" {
debug.ReportResult = fmt.Sprintf(` { "result": %q }`, noop_debug.EmptyReportResultMessage)
}
err = debug.WriteDebug(debugFilePath)
if err != nil {
return err
}
os.Stderr.WriteString(debug.ReportStderr)
if debug.ReportError != "" {
return errors.New(debug.ReportError)
} else {
os.Stdout.WriteString(debug.ReportResult)
}
return nil
}
func debugGetSupportedVersions() []string {
vers := []string{"0.-42.0", "0.1.0", "0.2.0"}
cniArgs := os.Getenv("CNI_ARGS")
if cniArgs == "" {
return vers
}
extraArgs, err := parseExtraArgs(cniArgs)
if err != nil {
panic("test setup error: invalid CNI_ARGS format")
}
debugFilePath, ok := extraArgs["DEBUG"]
if !ok {
panic("test setup error: missing DEBUG in CNI_ARGS")
}
debug, err := noop_debug.ReadDebug(debugFilePath)
if err != nil {
panic("test setup error: unable to read debug file: " + err.Error())
}
if debug.ReportVersionSupport == nil {
return vers
}
return debug.ReportVersionSupport
}
func cmdAdd(args *skel.CmdArgs) error {
return debugBehavior(args, "ADD")
}
func cmdDel(args *skel.CmdArgs) error {
return debugBehavior(args, "DEL")
}
func main() {
supportedVersions := debugGetSupportedVersions()
skel.PluginMain(cmdAdd, cmdDel, version.PluginSupports(supportedVersions...))
}
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