Added helper method to fetch machines by any nodekey + tests

machine.go

@@ -375,6 +375,19 @@ func (h *Headscale) GetMachineByNodeKey(
 	return &machine, nil
 }
 
+// GetMachineByAnyNodeKey finds a Machine by its current NodeKey or the old one, and returns the Machine struct.
+func (h *Headscale) GetMachineByAnyNodeKey(
+	nodeKey key.NodePublic, oldNodeKey key.NodePublic,
+) (*Machine, error) {
+	machine := Machine{}
+	if result := h.db.Preload("Namespace").First(&machine, "node_key = ? OR node_key = ?",
+		NodePublicKeyStripPrefix(nodeKey), NodePublicKeyStripPrefix(oldNodeKey)); result.Error != nil {
+		return nil, result.Error
+	}
+
+	return &machine, nil
+}
+
 // UpdateMachineFromDatabase takes a Machine struct pointer (typically already loaded from database
 // and updates it with the latest data from the database.
 func (h *Headscale) UpdateMachineFromDatabase(machine *Machine) error {

machine_test.go

@@ -11,6 +11,7 @@ import (
 	"gopkg.in/check.v1"
 	"inet.af/netaddr"
 	"tailscale.com/tailcfg"
+	"tailscale.com/types/key"
 )
 
 func (s *Suite) TestGetMachine(c *check.C) {
@@ -65,6 +66,63 @@ func (s *Suite) TestGetMachineByID(c *check.C) {
 	c.Assert(err, check.IsNil)
 }
 
+func (s *Suite) TestGetMachineByNodeKey(c *check.C) {
+	namespace, err := app.CreateNamespace("test")
+	c.Assert(err, check.IsNil)
+
+	pak, err := app.CreatePreAuthKey(namespace.Name, false, false, nil)
+	c.Assert(err, check.IsNil)
+
+	_, err = app.GetMachineByID(0)
+	c.Assert(err, check.NotNil)
+
+	nodeKey := key.NewNode()
+
+	machine := Machine{
+		ID:             0,
+		MachineKey:     "foo",
+		NodeKey:        NodePublicKeyStripPrefix(nodeKey.Public()),
+		DiscoKey:       "faa",
+		Hostname:       "testmachine",
+		NamespaceID:    namespace.ID,
+		RegisterMethod: RegisterMethodAuthKey,
+		AuthKeyID:      uint(pak.ID),
+	}
+	app.db.Save(&machine)
+
+	_, err = app.GetMachineByNodeKey(nodeKey.Public())
+	c.Assert(err, check.IsNil)
+}
+
+func (s *Suite) TestGetMachineByAnyNodeKey(c *check.C) {
+	namespace, err := app.CreateNamespace("test")
+	c.Assert(err, check.IsNil)
+
+	pak, err := app.CreatePreAuthKey(namespace.Name, false, false, nil)
+	c.Assert(err, check.IsNil)
+
+	_, err = app.GetMachineByID(0)
+	c.Assert(err, check.NotNil)
+
+	nodeKey := key.NewNode()
+	oldNodeKey := key.NewNode()
+
+	machine := Machine{
+		ID:             0,
+		MachineKey:     "foo",
+		NodeKey:        NodePublicKeyStripPrefix(nodeKey.Public()),
+		DiscoKey:       "faa",
+		Hostname:       "testmachine",
+		NamespaceID:    namespace.ID,
+		RegisterMethod: RegisterMethodAuthKey,
+		AuthKeyID:      uint(pak.ID),
+	}
+	app.db.Save(&machine)
+
+	_, err = app.GetMachineByAnyNodeKey(nodeKey.Public(), oldNodeKey.Public())
+	c.Assert(err, check.IsNil)
+}
+
 func (s *Suite) TestDeleteMachine(c *check.C) {
 	namespace, err := app.CreateNamespace("test")
 	c.Assert(err, check.IsNil)