first

backend/internal/sysinfo/sysinfo.go

@@ -0,0 +1,55 @@
+package sysinfo
+
+import (
+	"strings"
+	"sync"
+)
+
+type Snapshot struct {
+	Version       string `json:"version"`
+	Clients       string `json:"clients"`
+	MsgReceived   string `json:"msgReceived"`
+	MsgSent       string `json:"msgSent"`
+	MsgStored     string `json:"msgStored"`
+	Subscriptions string `json:"subscriptions"`
+}
+
+type Store struct {
+	mu   sync.RWMutex
+	data Snapshot
+}
+
+func NewStore() *Store {
+	return &Store{}
+}
+
+func (s *Store) Update(topic string, payload string) {
+	trimmed := strings.TrimSpace(payload)
+	if trimmed == "" {
+		return
+	}
+	key := strings.TrimPrefix(topic, "$SYS/broker/")
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	switch key {
+	case "version":
+		s.data.Version = trimmed
+	case "clients/connected":
+		s.data.Clients = trimmed
+	case "messages/received":
+		s.data.MsgReceived = trimmed
+	case "messages/sent":
+		s.data.MsgSent = trimmed
+	case "messages/stored":
+		s.data.MsgStored = trimmed
+	case "subscriptions/count":
+		s.data.Subscriptions = trimmed
+	}
+}
+
+func (s *Store) Snapshot() Snapshot {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return s.data
+}