replace servers.servers singleton with server.Manager

server/manager.go

@@ -0,0 +1,46 @@
+package server
+
+import (
+	"github.com/pterodactyl/wings/panelapi"
+)
+
+type Manager interface {
+	// Initialize fetches all servers assigned to this node from the API.
+	Initialize(serversPerPage int) error
+	GetAll() []*Server
+	Get(uuid string) *Server
+	Add(s *Server)
+	Remove(s *Server)
+}
+
+type manager struct {
+	servers Collection
+
+	panelClient panelapi.Client
+}
+
+// NewManager creates a new server manager.
+func NewManager(panelClient panelapi.Client) Manager {
+	return &manager{panelClient: panelClient}
+}
+
+func (m *manager) GetAll() []*Server {
+	return m.servers.items
+}
+
+func (m *manager) Get(uuid string) *Server {
+	return m.servers.Find(func(s *Server) bool {
+		return s.Id() == uuid
+	})
+}
+
+func (m *manager) Add(s *Server) {
+	s.manager = m
+	m.servers.Add(s)
+}
+
+func (m *manager) Remove(s *Server) {
+	m.servers.Remove(func(sf *Server) bool {
+		return sf.Id() == s.Id()
+	})
+}