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main.go
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main.go
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package main
import (
"flag"
"fmt"
"garden-external-networker/bindmount"
"garden-external-networker/cni"
"garden-external-networker/config"
"garden-external-networker/filelock"
"garden-external-networker/ipc"
"garden-external-networker/legacynet"
"garden-external-networker/manager"
"garden-external-networker/port_allocator"
"os"
"github.com/coreos/go-iptables/iptables"
"code.cloudfoundry.org/lager"
)
var (
action string
handle string
cfg config.Config
)
func parseArgs(allArgs []string) error {
var configFilePath string
flagSet := flag.NewFlagSet("", flag.ContinueOnError)
flagSet.StringVar(&action, "action", "", "")
flagSet.StringVar(&handle, "handle", "", "")
flagSet.StringVar(&configFilePath, "configFile", "", "")
err := flagSet.Parse(allArgs[1:])
if err != nil {
return err
}
if len(flagSet.Args()) > 0 {
return fmt.Errorf("unexpected extra args: %+v", flagSet.Args())
}
if handle == "" {
return fmt.Errorf("missing required flag 'handle'")
}
if configFilePath == "" {
return fmt.Errorf("missing required flag 'configFile'")
}
cfg, err = config.New(configFilePath)
if err != nil {
return err
}
if action == "" {
return fmt.Errorf("missing required flag 'action'")
}
return nil
}
func main() {
if err := mainWithError(); err != nil {
fmt.Fprintf(os.Stderr, "error: %s", err)
os.Exit(1)
}
}
func mainWithError() error {
logger := lager.NewLogger("garden-external-networker")
logger.RegisterSink(lager.NewWriterSink(os.Stderr, lager.INFO))
if len(os.Args) == 1 || os.Args[1] == "-h" || os.Args[1] == "--help" {
fmt.Fprintf(os.Stderr, "this is a plugin for Garden-runC. Don't run it directly.")
os.Exit(1)
}
err := parseArgs(os.Args)
if err != nil {
return fmt.Errorf("parse args: %s", err)
}
logger.Info("action", lager.Data{"action": action})
cniLoader := &cni.CNILoader{
PluginDir: cfg.CniPluginDir,
ConfigDir: cfg.CniConfigDir,
Logger: logger,
}
networks, err := cniLoader.GetNetworkConfigs()
if err != nil {
return fmt.Errorf("load cni config: %s", err)
}
cniController := &cni.CNIController{
Logger: logger,
CNIConfig: cniLoader.GetCNIConfig(),
NetworkConfigs: networks,
}
mounter := &bindmount.Mounter{}
ipt, err := iptables.New()
if err != nil {
return fmt.Errorf("initialize iptables package: %s", err)
}
locker := &filelock.Locker{Path: cfg.StateFilePath}
tracker := &port_allocator.Tracker{
Logger: logger,
StartPort: cfg.StartPort,
Capacity: cfg.TotalPorts,
}
serializer := &port_allocator.Serializer{}
portAllocator := &port_allocator.PortAllocator{
Tracker: tracker,
Serializer: serializer,
Locker: locker,
}
chainNamer := &legacynet.ChainNamer{MaxLength: 28}
netinProvider := &legacynet.NetIn{
ChainNamer: chainNamer,
IPTables: ipt,
}
netoutProvider := &legacynet.NetOut{
ChainNamer: chainNamer,
IPTables: ipt,
}
manager := &manager.Manager{
Logger: logger,
CNIController: cniController,
Mounter: mounter,
BindMountRoot: cfg.BindMountDir,
PortAllocator: portAllocator,
OverlayNetwork: cfg.OverlayNetwork,
NetInProvider: netinProvider,
NetOutProvider: netoutProvider,
}
mux := ipc.Mux{
Up: manager.Up,
Down: manager.Down,
NetOut: manager.NetOut,
NetIn: manager.NetIn,
}
return mux.Handle(action, handle, os.Stdin, os.Stdout)
}