protofsm: add a Name() method to the env

This'll be used later to uniquely identify state machines for
routing/dispatch purposes.

Author: Roasbeef

protofsm/state_machine.go

@@ -53,6 +53,10 @@ type Environment interface {
 	// state machine.
 	CleanUp() error
 
+	// Name returns the name of the environment. This is used to uniquely
+	// identify the environment of related state machines.
+	Name() string
+
 	// TODO(roasbeef): also add checkpointing?
 }
 
@@ -223,6 +227,11 @@ func (s *StateMachine[Event, Env]) CanHandle(msg lnwire.Message) bool {
 	})
 }
 
+// Name returns the name of the state machine's environment.
+func (s *StateMachine[Event, Env]) Name() string {
+	return s.cfg.Env.Name()
+}
+
 // SendMessage attempts to send a wire message to the state machine. If the
 // message can be mapped using the default message mapper, then true is
 // returned indicating that the message was processed. Otherwise, false is

protofsm/state_machine_test.go

@@ -48,6 +48,10 @@ func (d *dummyEnv) CleanUp() error {
 	return args.Error(0)
 }
 
+func (d *dummyEnv) Name() string {
+	return "test"
+}
+
 type dummyStateStart struct {
 	canSend *atomic.Bool
 }