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func run(ctx context.Context, manager Manager, initFunc Init, name string, config Config) error {
parseFlags()
if versionFlag {
fmt.Printf("%s:\n", filepath.Base(os.Args[0]))
fmt.Println(" Version: ", version.Version)
fmt.Println(" Revision:", version.Revision)
fmt.Println(" Go version:", version.GoVersion)
fmt.Println("")
return nil
}
if namespaceFlag == "" {
return fmt.Errorf("shim namespace cannot be empty")
}
setRuntime()
// 1, 接收系统信号
// smp := []os.Signal{unix.SIGTERM, unix.SIGINT, unix.SIGPIPE}
// smp = append(smp, unix.SIGCHLD)
signals, err := setupSignals(config)
if err != nil {
return err
}
// prctl(PR_SET_CHILD_SUBREAPER,1)
// 让当前进程像init进程一样来收养孤儿进程，称为subreaper进程
// 孤儿进程成会被祖先中距离最近的 supreaper 进程收养
if !config.NoSubreaper {
if err := subreaper(); err != nil {
return err
}
}
ttrpcAddress := os.Getenv(ttrpcAddressEnv)
publisher, err := NewPublisher(ttrpcAddress)
if err != nil {
return err
}
defer publisher.Close()
ctx = namespaces.WithNamespace(ctx, namespaceFlag)
ctx = context.WithValue(ctx, OptsKey{}, Opts{BundlePath: bundlePath, Debug: debugFlag})
ctx, sd := shutdown.WithShutdown(ctx)
defer sd.Shutdown()
// 初始化manager
// 这里的manager并不为nil
if manager == nil {
service, err := initFunc(ctx, id, publisher, sd.Shutdown)
if err != nil {
return err
}
plugin.Register(&plugin.Registration{
Type: plugin.TTRPCPlugin,
ID: "task",
Requires: []plugin.Type{
plugin.EventPlugin,
},
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
return taskService{service}, nil
},
})
manager = shimToManager{
shim: service,
name: name,
}
}
// Handle explicit actions
switch action {
case "delete":
logger := log.G(ctx).WithFields(logrus.Fields{
"pid": os.Getpid(),
"namespace": namespaceFlag,
})
go reap(ctx, logger, signals)
ss, err := manager.Stop(ctx, id)
if err != nil {
return err
}
data, err := proto.Marshal(&shimapi.DeleteResponse{
Pid: uint32(ss.Pid),
ExitStatus: uint32(ss.ExitStatus),
ExitedAt: protobuf.ToTimestamp(ss.ExitedAt),
})
if err != nil {
return err
}
if _, err := os.Stdout.Write(data); err != nil {
return err
}
return nil
case "start":
opts := StartOpts{
ContainerdBinary: containerdBinaryFlag,
Address: addressFlag,
TTRPCAddress: ttrpcAddress,
Debug: debugFlag,
}
// 启动 shim server，并返回 sock address
address, err := manager.Start(ctx, id, opts)
if err != nil {
return err
}
if _, err := os.Stdout.WriteString(address); err != nil {
return err
}
return nil
}
if !config.NoSetupLogger {
ctx, err = setLogger(ctx, id)
if err != nil {
return err
}
}
plugin.Register(&plugin.Registration{
Type: plugin.InternalPlugin,
ID: "shutdown",
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
return sd, nil
},
})
// Register event plugin
plugin.Register(&plugin.Registration{
Type: plugin.EventPlugin,
ID: "publisher",
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
return publisher, nil
},
})
var (
initialized = plugin.NewPluginSet()
ttrpcServices = []ttrpcService{}
ttrpcUnaryInterceptors = []ttrpc.UnaryServerInterceptor{}
)
plugins := plugin.Graph(func(*plugin.Registration) bool { return false })
for _, p := range plugins {
id := p.URI()
log.G(ctx).WithField("type", p.Type).Infof("loading plugin %q...", id)
initContext := plugin.NewContext(
ctx,
p,
initialized,
// NOTE: Root is empty since the shim does not support persistent storage,
// shim plugins should make use state directory for writing files to disk.
// The state directory will be destroyed when the shim if cleaned up or
// on reboot
"",
bundlePath,
)
initContext.Address = addressFlag
initContext.TTRPCAddress = ttrpcAddress
// load the plugin specific configuration if it is provided
//TODO: Read configuration passed into shim, or from state directory?
//if p.Config != nil {
// pc, err := config.Decode(p)
// if err != nil {
// return nil, err
// }
// initContext.Config = pc
//}
result := p.Init(initContext)
if err := initialized.Add(result); err != nil {
return fmt.Errorf("could not add plugin result to plugin set: %w", err)
}
instance, err := result.Instance()
if err != nil {
if plugin.IsSkipPlugin(err) {
log.G(ctx).WithError(err).WithField("type", p.Type).Infof("skip loading plugin %q...", id)
continue
}
return fmt.Errorf("failed to load plugin %s: %w", id, err)
}
if src, ok := instance.(ttrpcService); ok {
logrus.WithField("id", id).Debug("registering ttrpc service")
ttrpcServices = append(ttrpcServices, src)
}
if src, ok := instance.(ttrpcServerOptioner); ok {
ttrpcUnaryInterceptors = append(ttrpcUnaryInterceptors, src.UnaryInterceptor())
}
}
if len(ttrpcServices) == 0 {
return fmt.Errorf("required that ttrpc service")
}
unaryInterceptor := chainUnaryServerInterceptors(ttrpcUnaryInterceptors...)
server, err := newServer(ttrpc.WithUnaryServerInterceptor(unaryInterceptor))
if err != nil {
return fmt.Errorf("failed creating server: %w", err)
}
for _, srv := range ttrpcServices {
if err := srv.RegisterTTRPC(server); err != nil {
return fmt.Errorf("failed to register service: %w", err)
}
}
if err := serve(ctx, server, signals, sd.Shutdown); err != nil {
if err != shutdown.ErrShutdown {
return err
}
}
// NOTE: If the shim server is down(like oom killer), the address
// socket might be leaking.
if address, err := ReadAddress("address"); err == nil {
_ = RemoveSocket(address)
}
select {
case <-publisher.Done():
return nil
case <-time.After(5 * time.Second):
return errors.New("publisher not closed")
}
}
|
