State: Ready events now automatically reset the state

state/state_events.go

@@ -50,6 +50,13 @@ func (s *State) hookSession() {
 func (s *State) onEvent(iface interface{}) {
 	switch ev := iface.(type) {
 	case *gateway.ReadyEvent:
+		// Reset the store before proceeding.
+		if resetter, ok := s.Store.(StoreResetter); ok {
+			if err := resetter.Reset(); err != nil {
+				s.stateErr(err, "Failed to reset state on READY")
+			}
+		}
+
 		// Set Ready to the state
 		s.Ready = *ev
 

state/store.go

@@ -92,6 +92,12 @@ type StoreModifier interface {
 	VoiceStateRemove(guildID discord.GuildID, userID discord.UserID) error
 }
 
+// StoreResetter is used by the state to reset the store on every Ready event.
+type StoreResetter interface {
+	// Reset resets the store to a new valid instance.
+	Reset() error
+}
+
 // ErrStoreNotFound is an error that a store can use to return when something
 // isn't in the storage. There is no strict restrictions on what uses this (the
 // default one does, though), so be advised.