Add voice state caching

state/state_events.go

@@ -257,6 +257,18 @@ func (s *State) onEvent(iface interface{}) {
 		if err := s.Store.MyselfSet((*discord.User)(ev)); err != nil {
 			s.stateErr(err, "Failed to update myself from USER_UPDATE")
 		}
+
+	case *gateway.VoiceStateUpdateEvent:
+		vs := (*discord.VoiceState)(ev)
+		if vs.ChannelID == 0 {
+			if err := s.Store.VoiceStateRemove(vs.GuildID, vs.UserID); err != nil {
+				s.stateErr(err, "Failed to remove voice state from state")
+			}
+		} else {
+			if err := s.Store.VoiceStateSet(vs.GuildID, vs); err != nil {
+				s.stateErr(err, "Failed to update voice state in state")
+			}
+		}
 	}
 }
 

state/store.go

@@ -51,6 +51,8 @@ type StoreGetter interface {
 
 	Role(guildID, roleID discord.Snowflake) (*discord.Role, error)
 	Roles(guildID discord.Snowflake) ([]discord.Role, error)
+
+	VoiceState(guildID discord.Snowflake, userID discord.Snowflake) (*discord.VoiceState, error)
 }
 
 type StoreModifier interface {
@@ -78,6 +80,9 @@ type StoreModifier interface {
 
 	RoleSet(guildID discord.Snowflake, role *discord.Role) error
 	RoleRemove(guildID, roleID discord.Snowflake) error
+
+	VoiceStateSet(guildID discord.Snowflake, voiceState *discord.VoiceState) error
+	VoiceStateRemove(guildID discord.Snowflake, userID discord.Snowflake) error
 }
 
 // ErrStoreNotFound is an error that a store can use to return when something

state/store_default.go

@@ -22,6 +22,7 @@ type DefaultStore struct {
 	members   map[discord.Snowflake][]discord.Member   // guildID:members
 	presences map[discord.Snowflake][]discord.Presence // guildID:presences
 	messages  map[discord.Snowflake][]discord.Message  // channelID:messages
+	voiceStates map[discord.Snowflake][]discord.VoiceState // guildID:voiceStates
 
 	mut sync.Mutex
 }
@@ -664,3 +665,67 @@ func (s *DefaultStore) RoleRemove(guildID, roleID discord.Snowflake) error {
 
 	return ErrStoreNotFound
 }
+
+////
+
+func (s *DefaultStore) VoiceState(guildID, userID discord.Snowflake) (*discord.VoiceState, error) {
+	s.mut.Lock()
+	defer s.mut.Unlock()
+
+	states, ok := s.voiceStates[guildID]
+	if !ok {
+		return nil, ErrStoreNotFound
+	}
+
+	for _, vs := range states {
+		if vs.UserID == userID {
+			return &vs, nil
+		}
+	}
+
+	return nil, ErrStoreNotFound
+}
+
+func (s *DefaultStore) VoiceStateSet(guildID discord.Snowflake, voiceState *discord.VoiceState) error {
+	s.mut.Lock()
+	defer s.mut.Unlock()
+
+	states, ok := s.voiceStates[guildID]
+	if !ok {
+		return ErrStoreNotFound
+	}
+
+	for i, vs := range states {
+		if vs.UserID == voiceState.UserID {
+			states[i] = *voiceState
+			s.voiceStates[guildID] = states
+
+			return nil
+		}
+	}
+
+	states = append(states, *voiceState)
+	s.voiceStates[guildID] = states
+	return nil
+}
+
+func (s *DefaultStore) VoiceStateRemove(guildID, userID discord.Snowflake) error {
+	s.mut.Lock()
+	defer s.mut.Unlock()
+
+	states, ok := s.voiceStates[guildID]
+	if !ok {
+		return ErrStoreNotFound
+	}
+
+	for i, vs := range states {
+		if vs.UserID == userID {
+			states = append(states[:i], states[i+1:]...)
+			s.voiceStates[guildID] = states
+
+			return nil
+		}
+	}
+
+	return ErrStoreNotFound
+}

state/store_noop.go

@@ -109,7 +109,7 @@ func (NoopStore) MaxMessages() int {
 	return 100
 }
 
-func (NoopStore) MessageSet(message *discord.Message) error {
+func (NoopStore) MessageSet(*discord.Message) error {
 	return nil
 }
 
@@ -148,3 +148,15 @@ func (NoopStore) RoleSet(discord.Snowflake, *discord.Role) error {
 func (NoopStore) RoleRemove(_, _ discord.Snowflake) error {
 	return nil
 }
+
+func (NoopStore) VoiceState(_, _ discord.Snowflake) (*discord.VoiceState, error) {
+	return nil, ErrNotImplemented
+}
+
+func (NoopStore) VoiceStateSet(discord.Snowflake, *discord.VoiceState) error {
+	return ErrNotImplemented
+}
+
+func (NoopStore) VoiceStateRemove(_, _ discord.Snowflake) error {
+	return ErrNotImplemented
+}