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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 libcni
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
)
type NotFoundError struct {
Dir string
Name string
}
func (e NotFoundError) Error() string {
return fmt.Sprintf(`no net configuration with name "%s" in %s`, e.Name, e.Dir)
}
type NoConfigsFoundError struct {
Dir string
}
func (e NoConfigsFoundError) Error() string {
return fmt.Sprintf(`no net configurations found in %s`, e.Dir)
}
func ConfFromBytes(bytes []byte) (*NetworkConfig, error) {
conf := &NetworkConfig{Bytes: bytes}
if err := json.Unmarshal(bytes, &conf.Network); err != nil {
return nil, fmt.Errorf("error parsing configuration: %s", err)
}
if conf.Network.Type == "" {
return nil, fmt.Errorf("error parsing configuration: missing 'type'")
}
return conf, nil
}
func ConfFromFile(filename string) (*NetworkConfig, error) {
bytes, err := ioutil.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("error reading %s: %s", filename, err)
}
return ConfFromBytes(bytes)
}
func ConfListFromBytes(bytes []byte) (*NetworkConfigList, error) {
rawList := make(map[string]interface{})
if err := json.Unmarshal(bytes, &rawList); err != nil {
return nil, fmt.Errorf("error parsing configuration list: %s", err)
}
rawName, ok := rawList["name"]
if !ok {
return nil, fmt.Errorf("error parsing configuration list: no name")
}
name, ok := rawName.(string)
if !ok {
return nil, fmt.Errorf("error parsing configuration list: invalid name type %T", rawName)
}
var cniVersion string
rawVersion, ok := rawList["cniVersion"]
if ok {
cniVersion, ok = rawVersion.(string)
if !ok {
return nil, fmt.Errorf("error parsing configuration list: invalid cniVersion type %T", rawVersion)
}
}
disableCheck := false
if rawDisableCheck, ok := rawList["disableCheck"]; ok {
disableCheck, ok = rawDisableCheck.(bool)
if !ok {
return nil, fmt.Errorf("error parsing configuration list: invalid disableCheck type %T", rawDisableCheck)
}
}
list := &NetworkConfigList{
Name: name,
DisableCheck: disableCheck,
CNIVersion: cniVersion,
Bytes: bytes,
}
var plugins []interface{}
plug, ok := rawList["plugins"]
if !ok {
return nil, fmt.Errorf("error parsing configuration list: no 'plugins' key")
}
plugins, ok = plug.([]interface{})
if !ok {
return nil, fmt.Errorf("error parsing configuration list: invalid 'plugins' type %T", plug)
}
if len(plugins) == 0 {
return nil, fmt.Errorf("error parsing configuration list: no plugins in list")
}
for i, conf := range plugins {
newBytes, err := json.Marshal(conf)
if err != nil {
return nil, fmt.Errorf("failed to marshal plugin config %d: %v", i, err)
}
netConf, err := ConfFromBytes(newBytes)
if err != nil {
return nil, fmt.Errorf("failed to parse plugin config %d: %v", i, err)
}
list.Plugins = append(list.Plugins, netConf)
}
return list, nil
}
func ConfListFromFile(filename string) (*NetworkConfigList, error) {
bytes, err := ioutil.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("error reading %s: %s", filename, err)
}
return ConfListFromBytes(bytes)
}
func ConfFiles(dir string, extensions []string) ([]string, error) {
// In part, adapted from rkt/networking/podenv.go#listFiles
files, err := ioutil.ReadDir(dir)
switch {
case err == nil: // break
case os.IsNotExist(err):
return nil, nil
default:
return nil, err
}
confFiles := []string{}
for _, f := range files {
if f.IsDir() {
continue
}
fileExt := filepath.Ext(f.Name())
for _, ext := range extensions {
if fileExt == ext {
confFiles = append(confFiles, filepath.Join(dir, f.Name()))
}
}
}
return confFiles, nil
}
func LoadConf(dir, name string) (*NetworkConfig, error) {
files, err := ConfFiles(dir, []string{".conf", ".json"})
switch {
case err != nil:
return nil, err
case len(files) == 0:
return nil, NoConfigsFoundError{Dir: dir}
}
sort.Strings(files)
for _, confFile := range files {
conf, err := ConfFromFile(confFile)
if err != nil {
return nil, err
}
if conf.Network.Name == name {
return conf, nil
}
}
return nil, NotFoundError{dir, name}
}
func LoadConfList(dir, name string) (*NetworkConfigList, error) {
files, err := ConfFiles(dir, []string{".conflist"})
if err != nil {
return nil, err
}
sort.Strings(files)
for _, confFile := range files {
conf, err := ConfListFromFile(confFile)
if err != nil {
return nil, err
}
if conf.Name == name {
return conf, nil
}
}
// Try and load a network configuration file (instead of list)
// from the same name, then upconvert.
singleConf, err := LoadConf(dir, name)
if err != nil {
// A little extra logic so the error makes sense
if _, ok := err.(NoConfigsFoundError); len(files) != 0 && ok {
// Config lists found but no config files found
return nil, NotFoundError{dir, name}
}
return nil, err
}
return ConfListFromConf(singleConf)
}
func InjectConf(original *NetworkConfig, newValues map[string]interface{}) (*NetworkConfig, error) {
config := make(map[string]interface{})
err := json.Unmarshal(original.Bytes, &config)
if err != nil {
return nil, fmt.Errorf("unmarshal existing network bytes: %s", err)
}
for key, value := range newValues {
if key == "" {
return nil, fmt.Errorf("keys cannot be empty")
}
if value == nil {
return nil, fmt.Errorf("key '%s' value must not be nil", key)
}
config[key] = value
}
newBytes, err := json.Marshal(config)
if err != nil {
return nil, err
}
return ConfFromBytes(newBytes)
}
// ConfListFromConf "upconverts" a network config in to a NetworkConfigList,
// with the single network as the only entry in the list.
func ConfListFromConf(original *NetworkConfig) (*NetworkConfigList, error) {
// Re-deserialize the config's json, then make a raw map configlist.
// This may seem a bit strange, but it's to make the Bytes fields
// actually make sense. Otherwise, the generated json is littered with
// golang default values.
rawConfig := make(map[string]interface{})
if err := json.Unmarshal(original.Bytes, &rawConfig); err != nil {
return nil, err
}
rawConfigList := map[string]interface{}{
"name": original.Network.Name,
"cniVersion": original.Network.CNIVersion,
"plugins": []interface{}{rawConfig},
}
b, err := json.Marshal(rawConfigList)
if err != nil {
return nil, err
}
return ConfListFromBytes(b)
}
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