b88f173c43
This takes some of the machinery from CNI and from the rkt networking code, and turns it into a library that can be linked into go apps. Included is an example command-line application that uses the library, called `cnitool`. Other headline changes: * Plugin exec'ing is factored out The motivation here is to factor out the protocol for invoking plugins. To that end, a generalisation of the code from api.go and pkg/plugin/ipam.go goes into pkg/invoke/exec.go. * Move argument-handling and conf-loading into public API The fact that the arguments get turned into an environment for the plugin is incidental to the API; so, provide a way of supplying them as a struct or saying "just use the same arguments as I got" (the latter is for IPAM plugins).
86 lines
2.1 KiB
Go
86 lines
2.1 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package libcni
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"sort"
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)
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func ConfFromBytes(bytes []byte) (*NetworkConfig, error) {
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conf := &NetworkConfig{Bytes: bytes}
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if err := json.Unmarshal(bytes, &conf.Network); err != nil {
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return nil, fmt.Errorf("error parsing configuration: %s", err)
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}
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return conf, nil
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}
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func ConfFromFile(filename string) (*NetworkConfig, error) {
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bytes, err := ioutil.ReadFile(filename)
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if err != nil {
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return nil, fmt.Errorf("error reading %s: %s", filename, err)
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}
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return ConfFromBytes(bytes)
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}
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func ConfFiles(dir string) ([]string, error) {
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// In part, adapted from rkt/networking/podenv.go#listFiles
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files, err := ioutil.ReadDir(dir)
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switch {
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case err == nil: // break
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case os.IsNotExist(err):
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return nil, nil
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default:
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return nil, err
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}
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confFiles := []string{}
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for _, f := range files {
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if f.IsDir() {
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continue
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}
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if filepath.Ext(f.Name()) == ".conf" {
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confFiles = append(confFiles, filepath.Join(dir, f.Name()))
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}
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}
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return confFiles, nil
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}
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func LoadConf(dir, name string) (*NetworkConfig, error) {
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files, err := ConfFiles(dir)
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switch {
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case err != nil:
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return nil, err
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case len(files) == 0:
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return nil, fmt.Errorf("no net configurations found")
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}
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sort.Strings(files)
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for _, confFile := range files {
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conf, err := ConfFromFile(confFile)
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if err != nil {
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return nil, err
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}
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if conf.Network.Name == name {
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return conf, nil
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}
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}
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return nil, fmt.Errorf(`no net configuration with name "%s" in %s`, name, dir)
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}
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