forked from ehazlett/stellar
/
main.go
143 lines (119 loc) · 2.93 KB
/
main.go
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package main
import (
"encoding/json"
"fmt"
"net"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/types/current"
cniversion "github.com/containernetworking/cni/pkg/version"
"github.com/ehazlett/stellar/client"
"github.com/ehazlett/stellar/version"
)
type Net struct {
Name string `json:"name"`
CNIVersion string `json:"cniVersion"`
IPAM *IPAMConfig `json:"ipam"`
}
type IPAMConfig struct {
Name string
Type string `json:"type"`
NodeName string `json:"node_name"`
PeerAddr string `json:"peer_addr"`
}
func main() {
ver := version.BuildVersion()
skel.PluginMain(cmdAdd, cmdGet, cmdDel, cniversion.All, ver)
}
func cmdGet(args *skel.CmdArgs) error {
// TODO: implement
return fmt.Errorf("not implemented")
}
func loadConfig(bytes []byte, envArgs string) (*IPAMConfig, string, error) {
n := Net{}
if err := json.Unmarshal(bytes, &n); err != nil {
return nil, "", err
}
if n.IPAM == nil {
return nil, "", fmt.Errorf("IPAM config missing 'ipam' key")
}
if n.IPAM.NodeName == "" || n.IPAM.PeerAddr == "" {
return nil, "", fmt.Errorf("IPAM config must have node_name and peer_addr")
}
n.IPAM.Name = n.Name
return n.IPAM, n.CNIVersion, nil
}
func cmdAdd(args *skel.CmdArgs) error {
cfg, confVersion, err := loadConfig(args.StdinData, args.Args)
if err != nil {
return err
}
id := args.ContainerID
ip, subnet, err := allocateIP(id, cfg.NodeName, cfg.PeerAddr)
if err != nil {
return err
}
gw := ip.Mask(subnet.Mask)
gw[3]++
result := ¤t.Result{}
result.IPs = []*current.IPConfig{
{
Version: "4",
Address: net.IPNet{IP: ip, Mask: subnet.Mask},
Gateway: gw,
},
}
result.Routes = []*types.Route{
{
Dst: net.IPNet{IP: net.IP{0, 0, 0, 0}, Mask: net.IPv4Mask(0, 0, 0, 0)},
GW: gw,
},
}
return types.PrintResult(result, confVersion)
}
func cmdDel(args *skel.CmdArgs) error {
cfg, _, err := loadConfig(args.StdinData, args.Args)
if err != nil {
return err
}
id := args.ContainerID
if err := releaseIP(id, cfg.NodeName, cfg.PeerAddr); err != nil {
return err
}
return nil
}
func allocateIP(id, nodeName, peerAddr string) (net.IP, *net.IPNet, error) {
c, err := client.NewClient(peerAddr)
if err != nil {
return nil, nil, err
}
defer c.Close()
subnetCIDR, err := c.Network().GetSubnet(nodeName)
if err != nil {
return nil, nil, err
}
_, subnet, err := net.ParseCIDR(subnetCIDR)
if err != nil {
return nil, nil, err
}
ip, err := c.Network().AllocateIP(id, nodeName, subnetCIDR)
if err != nil {
return nil, nil, err
}
return ip, subnet, nil
}
func releaseIP(id, nodeName, peerAddr string) error {
c, err := client.NewClient(peerAddr)
if err != nil {
return err
}
defer c.Close()
ip, err := c.Network().GetIP(id, nodeName)
if err != nil {
return err
}
if _, err := c.Network().ReleaseIP(id, ip.String(), nodeName); err != nil {
return err
}
return nil
}