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feat: add status subscription service
the shim ttrpc service now exposes a SubscribeStatus function which the manager subscribes to for receiving zeropod status updates, such as when checkpointing and restoring.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package manager | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "log/slog" | ||
| "net" | ||
| "os" | ||
| "path/filepath" | ||
|
|
||
| "github.com/containerd/ttrpc" | ||
| v1 "github.com/ctrox/zeropod/api/shim/v1" | ||
| "github.com/ctrox/zeropod/runc/task" | ||
| "github.com/fsnotify/fsnotify" | ||
| "google.golang.org/protobuf/types/known/emptypb" | ||
| ) | ||
|
|
||
| func StartSubscribers(ctx context.Context) error { | ||
| socks, err := os.ReadDir(task.ShimSocketPath) | ||
| if err != nil { | ||
| return fmt.Errorf("error listing file in shim socket path: %s", err) | ||
| } | ||
|
|
||
| for _, sock := range socks { | ||
| sock := sock | ||
| go func() { | ||
| if err := subscribe(ctx, filepath.Join(task.ShimSocketPath, sock.Name())); err != nil { | ||
| slog.Error("error subscribing", "sock", sock.Name(), "err", err) | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| go watchForShims(ctx) | ||
|
|
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| return nil | ||
| } | ||
|
|
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| func subscribe(ctx context.Context, sock string) error { | ||
| log := slog.With("sock", sock) | ||
| log.Info("subscribing to status events") | ||
|
|
||
| conn, err := net.Dial("unix", sock) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| shimClient := v1.NewShimClient(ttrpc.NewClient(conn)) | ||
| // not sure why but the emptypb needs to be set in order for the subscribe | ||
| // to be received | ||
| client, err := shimClient.SubscribeStatus(ctx, &v1.SubscribeStatusRequest{Empty: &emptypb.Empty{}}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for { | ||
| status, err := client.Recv() | ||
| if err != nil { | ||
| if err == io.EOF || errors.Is(err, ttrpc.ErrClosed) { | ||
| log.Info("subscribe closed") | ||
| } else { | ||
| log.Error("subscribe closed", "err", err) | ||
| } | ||
| break | ||
| } | ||
| slog.Info("received status", | ||
| "container", status.Name, "pod", status.PodName, | ||
| "namespace", status.PodNamespace, "phase", status.Phase) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
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||
| func watchForShims(ctx context.Context) error { | ||
| watcher, err := fsnotify.NewWatcher() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer watcher.Close() | ||
|
|
||
| if err := watcher.Add(task.ShimSocketPath); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for { | ||
| select { | ||
| case event := <-watcher.Events: | ||
| switch event.Op { | ||
| case fsnotify.Create: | ||
| if err := subscribe(ctx, event.Name); err != nil { | ||
| slog.Error("error subscribing", "sock", event.Name, "err", err) | ||
| } | ||
| } | ||
| case err := <-watcher.Errors: | ||
| slog.Error("watch error", "err", err) | ||
| case <-ctx.Done(): | ||
| return nil | ||
| } | ||
| } | ||
| } |
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