[client, management] Add new network concept (#3047)

---------

Co-authored-by: Pascal Fischer <32096965+pascal-fischer@users.noreply.github.com>
Co-authored-by: bcmmbaga <bethuelmbaga12@gmail.com>
Co-authored-by: Maycon Santos <mlsmaycon@gmail.com>
Co-authored-by: Zoltan Papp <zoltan.pmail@gmail.com>

client/internal/peerstore/store.go

@@ -0,0 +1,87 @@
+package peerstore
+
+import (
+	"net"
+	"sync"
+
+	"golang.org/x/exp/maps"
+
+	"github.com/netbirdio/netbird/client/internal/peer"
+)
+
+// Store is a thread-safe store for peer connections.
+type Store struct {
+	peerConns   map[string]*peer.Conn
+	peerConnsMu sync.RWMutex
+}
+
+func NewConnStore() *Store {
+	return &Store{
+		peerConns: make(map[string]*peer.Conn),
+	}
+}
+
+func (s *Store) AddPeerConn(pubKey string, conn *peer.Conn) bool {
+	s.peerConnsMu.Lock()
+	defer s.peerConnsMu.Unlock()
+
+	_, ok := s.peerConns[pubKey]
+	if ok {
+		return false
+	}
+
+	s.peerConns[pubKey] = conn
+	return true
+}
+
+func (s *Store) Remove(pubKey string) (*peer.Conn, bool) {
+	s.peerConnsMu.Lock()
+	defer s.peerConnsMu.Unlock()
+
+	p, ok := s.peerConns[pubKey]
+	if !ok {
+		return nil, false
+	}
+	delete(s.peerConns, pubKey)
+	return p, true
+}
+
+func (s *Store) AllowedIPs(pubKey string) (string, bool) {
+	s.peerConnsMu.RLock()
+	defer s.peerConnsMu.RUnlock()
+
+	p, ok := s.peerConns[pubKey]
+	if !ok {
+		return "", false
+	}
+	return p.WgConfig().AllowedIps, true
+}
+
+func (s *Store) AllowedIP(pubKey string) (net.IP, bool) {
+	s.peerConnsMu.RLock()
+	defer s.peerConnsMu.RUnlock()
+
+	p, ok := s.peerConns[pubKey]
+	if !ok {
+		return nil, false
+	}
+	return p.AllowedIP(), true
+}
+
+func (s *Store) PeerConn(pubKey string) (*peer.Conn, bool) {
+	s.peerConnsMu.RLock()
+	defer s.peerConnsMu.RUnlock()
+
+	p, ok := s.peerConns[pubKey]
+	if !ok {
+		return nil, false
+	}
+	return p, true
+}
+
+func (s *Store) PeersPubKey() []string {
+	s.peerConnsMu.RLock()
+	defer s.peerConnsMu.RUnlock()
+
+	return maps.Keys(s.peerConns)
+}