feat(events): listener Docker events (F-002) — auto-refresh daftar + panel Aktivitas beranda hidup

internal/docker/events.go

@@ -0,0 +1,71 @@
+package docker
+
+import (
+	"context"
+	"time"
+
+	"github.com/docker/docker/api/types/events"
+	"github.com/docker/docker/api/types/filters"
+)
+
+// Event — ringkasan event Docker untuk daftar auto-refresh & feed aktivitas.
+type Event struct {
+	At     time.Time
+	Type   string // container | image | volume | network
+	Action string // start | stop | die | destroy | pull | …
+	Actor  string // nama (atau ID pendek bila nama tidak ada)
+}
+
+// activityTypes — jenis event yang relevan untuk tia (buang noise daemon/plugin).
+var activityTypes = []string{"container", "image", "volume", "network"}
+
+// StreamEvents membuka stream event (follow) dari daemon; channel ditutup
+// saat ctx dibatalkan atau koneksi putus. Buffer 64: saat konsumen lambat,
+// event di-drop (UI tetap responsif; daftar disinkronkan ulang oleh refresh).
+func (c *Client) StreamEvents(ctx context.Context) <-chan Event {
+	args := filters.NewArgs()
+	for _, t := range activityTypes {
+		args.Add("type", t)
+	}
+	msgCh, errCh := c.cli.Events(ctx, events.ListOptions{Filters: args})
+
+	out := make(chan Event, 64)
+	go func() {
+		defer close(out)
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case m, ok := <-msgCh:
+				if !ok {
+					return
+				}
+				actor := m.Actor.Attributes["name"]
+				if actor == "" {
+					// Volume: Actor.ID = nama volume penuh — jangan dipotong.
+					// Image: Actor.ID = sha256 (64 hex) → tampilkan 12 char.
+					actor = m.Actor.ID
+					if len(actor) == 64 {
+						actor = trimID(actor)
+					} else if len(actor) > 40 {
+						actor = actor[:40]
+					}
+				}
+				at := time.Unix(0, m.TimeNano)
+				if m.TimeNano == 0 {
+					at = time.Unix(m.Time, 0)
+				}
+				select {
+				case out <- Event{At: at, Type: string(m.Type), Action: string(m.Action), Actor: actor}:
+				default:
+				}
+			case <-errCh:
+				if ctx.Err() != nil {
+					return
+				}
+				return // koneksi putus → channel ditutup; app akan mencoba lagi
+			}
+		}
+	}()
+	return out
+}