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).
74 lines
1.8 KiB
Go
74 lines
1.8 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 main
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import (
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"fmt"
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"net/rpc"
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"os"
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"path/filepath"
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"github.com/appc/cni/pkg/skel"
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"github.com/appc/cni/pkg/types"
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)
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const socketPath = "/run/cni/dhcp.sock"
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func main() {
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if len(os.Args) > 1 && os.Args[1] == "daemon" {
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runDaemon()
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} else {
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skel.PluginMain(cmdAdd, cmdDel)
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}
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}
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func cmdAdd(args *skel.CmdArgs) error {
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result := types.Result{}
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if err := rpcCall("DHCP.Allocate", args, &result); err != nil {
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return err
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}
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return result.Print()
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}
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func cmdDel(args *skel.CmdArgs) error {
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result := struct{}{}
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if err := rpcCall("DHCP.Release", args, &result); err != nil {
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return fmt.Errorf("error dialing DHCP daemon: %v", err)
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}
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return nil
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}
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func rpcCall(method string, args *skel.CmdArgs, result interface{}) error {
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client, err := rpc.DialHTTP("unix", socketPath)
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if err != nil {
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return fmt.Errorf("error dialing DHCP daemon: %v", err)
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}
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// The daemon may be running under a different working dir
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// so make sure the netns path is absolute.
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netns, err := filepath.Abs(args.Netns)
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if err != nil {
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return fmt.Errorf("failed to make %q an absolute path: %v", args.Netns, err)
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}
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args.Netns = netns
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err = client.Call(method, args, result)
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if err != nil {
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return fmt.Errorf("error calling %v: %v", method, err)
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}
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return nil
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}
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