Fix /shutdown or ^C no longer causing server exit
[oweals/minetest.git] / src / client.h
1 /*
2 Minetest
3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef CLIENT_HEADER
21 #define CLIENT_HEADER
22
23 #include "network/connection.h"
24 #include "clientenvironment.h"
25 #include "irrlichttypes_extrabloated.h"
26 #include "threading/mutex.h"
27 #include <ostream>
28 #include <map>
29 #include <set>
30 #include <vector>
31 #include "clientobject.h"
32 #include "gamedef.h"
33 #include "inventorymanager.h"
34 #include "localplayer.h"
35 #include "hud.h"
36 #include "particles.h"
37 #include "mapnode.h"
38 #include "tileanimation.h"
39
40 struct MeshMakeData;
41 class MapBlockMesh;
42 class IWritableTextureSource;
43 class IWritableShaderSource;
44 class IWritableItemDefManager;
45 class IWritableNodeDefManager;
46 //class IWritableCraftDefManager;
47 class ClientMediaDownloader;
48 struct MapDrawControl;
49 class MtEventManager;
50 struct PointedThing;
51 class Database;
52 class Minimap;
53 struct MinimapMapblock;
54 class Camera;
55 class NetworkPacket;
56
57 struct QueuedMeshUpdate
58 {
59         v3s16 p;
60         MeshMakeData *data;
61         bool ack_block_to_server;
62
63         QueuedMeshUpdate();
64         ~QueuedMeshUpdate();
65 };
66
67 enum LocalClientState {
68         LC_Created,
69         LC_Init,
70         LC_Ready
71 };
72
73 /*
74         A thread-safe queue of mesh update tasks
75 */
76 class MeshUpdateQueue
77 {
78 public:
79         MeshUpdateQueue();
80
81         ~MeshUpdateQueue();
82
83         /*
84                 peer_id=0 adds with nobody to send to
85         */
86         void addBlock(v3s16 p, MeshMakeData *data,
87                         bool ack_block_to_server, bool urgent);
88
89         // Returned pointer must be deleted
90         // Returns NULL if queue is empty
91         QueuedMeshUpdate * pop();
92
93         u32 size()
94         {
95                 MutexAutoLock lock(m_mutex);
96                 return m_queue.size();
97         }
98
99 private:
100         std::vector<QueuedMeshUpdate*> m_queue;
101         std::set<v3s16> m_urgents;
102         Mutex m_mutex;
103 };
104
105 struct MeshUpdateResult
106 {
107         v3s16 p;
108         MapBlockMesh *mesh;
109         bool ack_block_to_server;
110
111         MeshUpdateResult():
112                 p(-1338,-1338,-1338),
113                 mesh(NULL),
114                 ack_block_to_server(false)
115         {
116         }
117 };
118
119 class MeshUpdateThread : public UpdateThread
120 {
121 private:
122         MeshUpdateQueue m_queue_in;
123
124 protected:
125         virtual void doUpdate();
126
127 public:
128
129         MeshUpdateThread() : UpdateThread("Mesh") {}
130
131         void enqueueUpdate(v3s16 p, MeshMakeData *data,
132                         bool ack_block_to_server, bool urgent);
133         MutexedQueue<MeshUpdateResult> m_queue_out;
134
135         v3s16 m_camera_offset;
136 };
137
138 enum ClientEventType
139 {
140         CE_NONE,
141         CE_PLAYER_DAMAGE,
142         CE_PLAYER_FORCE_MOVE,
143         CE_DEATHSCREEN,
144         CE_SHOW_FORMSPEC,
145         CE_SHOW_LOCAL_FORMSPEC,
146         CE_SPAWN_PARTICLE,
147         CE_ADD_PARTICLESPAWNER,
148         CE_DELETE_PARTICLESPAWNER,
149         CE_HUDADD,
150         CE_HUDRM,
151         CE_HUDCHANGE,
152         CE_SET_SKY,
153         CE_OVERRIDE_DAY_NIGHT_RATIO,
154 };
155
156 struct ClientEvent
157 {
158         ClientEventType type;
159         union{
160                 //struct{
161                 //} none;
162                 struct{
163                         u8 amount;
164                 } player_damage;
165                 struct{
166                         f32 pitch;
167                         f32 yaw;
168                 } player_force_move;
169                 struct{
170                         bool set_camera_point_target;
171                         f32 camera_point_target_x;
172                         f32 camera_point_target_y;
173                         f32 camera_point_target_z;
174                 } deathscreen;
175                 struct{
176                         std::string *formspec;
177                         std::string *formname;
178                 } show_formspec;
179                 //struct{
180                 //} textures_updated;
181                 struct{
182                         v3f *pos;
183                         v3f *vel;
184                         v3f *acc;
185                         f32 expirationtime;
186                         f32 size;
187                         bool collisiondetection;
188                         bool collision_removal;
189                         bool vertical;
190                         std::string *texture;
191                         struct TileAnimationParams animation;
192                         u8 glow;
193                 } spawn_particle;
194                 struct{
195                         u16 amount;
196                         f32 spawntime;
197                         v3f *minpos;
198                         v3f *maxpos;
199                         v3f *minvel;
200                         v3f *maxvel;
201                         v3f *minacc;
202                         v3f *maxacc;
203                         f32 minexptime;
204                         f32 maxexptime;
205                         f32 minsize;
206                         f32 maxsize;
207                         bool collisiondetection;
208                         bool collision_removal;
209                         u16 attached_id;
210                         bool vertical;
211                         std::string *texture;
212                         u32 id;
213                         struct TileAnimationParams animation;
214                         u8 glow;
215                 } add_particlespawner;
216                 struct{
217                         u32 id;
218                 } delete_particlespawner;
219                 struct{
220                         u32 id;
221                         u8 type;
222                         v2f *pos;
223                         std::string *name;
224                         v2f *scale;
225                         std::string *text;
226                         u32 number;
227                         u32 item;
228                         u32 dir;
229                         v2f *align;
230                         v2f *offset;
231                         v3f *world_pos;
232                         v2s32 * size;
233                 } hudadd;
234                 struct{
235                         u32 id;
236                 } hudrm;
237                 struct{
238                         u32 id;
239                         HudElementStat stat;
240                         v2f *v2fdata;
241                         std::string *sdata;
242                         u32 data;
243                         v3f *v3fdata;
244                         v2s32 * v2s32data;
245                 } hudchange;
246                 struct{
247                         video::SColor *bgcolor;
248                         std::string *type;
249                         std::vector<std::string> *params;
250                 } set_sky;
251                 struct{
252                         bool do_override;
253                         float ratio_f;
254                 } override_day_night_ratio;
255         };
256 };
257
258 /*
259         Packet counter
260 */
261
262 class PacketCounter
263 {
264 public:
265         PacketCounter()
266         {
267         }
268
269         void add(u16 command)
270         {
271                 std::map<u16, u16>::iterator n = m_packets.find(command);
272                 if(n == m_packets.end())
273                 {
274                         m_packets[command] = 1;
275                 }
276                 else
277                 {
278                         n->second++;
279                 }
280         }
281
282         void clear()
283         {
284                 for(std::map<u16, u16>::iterator
285                                 i = m_packets.begin();
286                                 i != m_packets.end(); ++i)
287                 {
288                         i->second = 0;
289                 }
290         }
291
292         void print(std::ostream &o)
293         {
294                 for(std::map<u16, u16>::iterator
295                                 i = m_packets.begin();
296                                 i != m_packets.end(); ++i)
297                 {
298                         o<<"cmd "<<i->first
299                                         <<" count "<<i->second
300                                         <<std::endl;
301                 }
302         }
303
304 private:
305         // command, count
306         std::map<u16, u16> m_packets;
307 };
308
309 class ClientScripting;
310 class GameUIFlags;
311
312 class Client : public con::PeerHandler, public InventoryManager, public IGameDef
313 {
314 public:
315         /*
316                 NOTE: Nothing is thread-safe here.
317         */
318
319         Client(
320                         IrrlichtDevice *device,
321                         const char *playername,
322                         std::string password,
323                         MapDrawControl &control,
324                         IWritableTextureSource *tsrc,
325                         IWritableShaderSource *shsrc,
326                         IWritableItemDefManager *itemdef,
327                         IWritableNodeDefManager *nodedef,
328                         ISoundManager *sound,
329                         MtEventManager *event,
330                         bool ipv6,
331                         GameUIFlags *game_ui_flags
332         );
333
334         ~Client();
335
336         void initMods();
337
338         /*
339          request all threads managed by client to be stopped
340          */
341         void Stop();
342
343
344         bool isShutdown();
345
346         /*
347                 The name of the local player should already be set when
348                 calling this, as it is sent in the initialization.
349         */
350         void connect(Address address,
351                         const std::string &address_name,
352                         bool is_local_server);
353
354         /*
355                 Stuff that references the environment is valid only as
356                 long as this is not called. (eg. Players)
357                 If this throws a PeerNotFoundException, the connection has
358                 timed out.
359         */
360         void step(float dtime);
361
362         /*
363          * Command Handlers
364          */
365
366         void handleCommand(NetworkPacket* pkt);
367
368         void handleCommand_Null(NetworkPacket* pkt) {};
369         void handleCommand_Deprecated(NetworkPacket* pkt);
370         void handleCommand_Hello(NetworkPacket* pkt);
371         void handleCommand_AuthAccept(NetworkPacket* pkt);
372         void handleCommand_AcceptSudoMode(NetworkPacket* pkt);
373         void handleCommand_DenySudoMode(NetworkPacket* pkt);
374         void handleCommand_InitLegacy(NetworkPacket* pkt);
375         void handleCommand_AccessDenied(NetworkPacket* pkt);
376         void handleCommand_RemoveNode(NetworkPacket* pkt);
377         void handleCommand_AddNode(NetworkPacket* pkt);
378         void handleCommand_BlockData(NetworkPacket* pkt);
379         void handleCommand_Inventory(NetworkPacket* pkt);
380         void handleCommand_TimeOfDay(NetworkPacket* pkt);
381         void handleCommand_ChatMessage(NetworkPacket* pkt);
382         void handleCommand_ActiveObjectRemoveAdd(NetworkPacket* pkt);
383         void handleCommand_ActiveObjectMessages(NetworkPacket* pkt);
384         void handleCommand_Movement(NetworkPacket* pkt);
385         void handleCommand_HP(NetworkPacket* pkt);
386         void handleCommand_Breath(NetworkPacket* pkt);
387         void handleCommand_MovePlayer(NetworkPacket* pkt);
388         void handleCommand_PlayerItem(NetworkPacket* pkt);
389         void handleCommand_DeathScreen(NetworkPacket* pkt);
390         void handleCommand_AnnounceMedia(NetworkPacket* pkt);
391         void handleCommand_Media(NetworkPacket* pkt);
392         void handleCommand_ToolDef(NetworkPacket* pkt);
393         void handleCommand_NodeDef(NetworkPacket* pkt);
394         void handleCommand_CraftItemDef(NetworkPacket* pkt);
395         void handleCommand_ItemDef(NetworkPacket* pkt);
396         void handleCommand_PlaySound(NetworkPacket* pkt);
397         void handleCommand_StopSound(NetworkPacket* pkt);
398         void handleCommand_Privileges(NetworkPacket* pkt);
399         void handleCommand_InventoryFormSpec(NetworkPacket* pkt);
400         void handleCommand_DetachedInventory(NetworkPacket* pkt);
401         void handleCommand_ShowFormSpec(NetworkPacket* pkt);
402         void handleCommand_SpawnParticle(NetworkPacket* pkt);
403         void handleCommand_AddParticleSpawner(NetworkPacket* pkt);
404         void handleCommand_DeleteParticleSpawner(NetworkPacket* pkt);
405         void handleCommand_HudAdd(NetworkPacket* pkt);
406         void handleCommand_HudRemove(NetworkPacket* pkt);
407         void handleCommand_HudChange(NetworkPacket* pkt);
408         void handleCommand_HudSetFlags(NetworkPacket* pkt);
409         void handleCommand_HudSetParam(NetworkPacket* pkt);
410         void handleCommand_HudSetSky(NetworkPacket* pkt);
411         void handleCommand_OverrideDayNightRatio(NetworkPacket* pkt);
412         void handleCommand_LocalPlayerAnimations(NetworkPacket* pkt);
413         void handleCommand_EyeOffset(NetworkPacket* pkt);
414         void handleCommand_SrpBytesSandB(NetworkPacket* pkt);
415
416         void ProcessData(NetworkPacket *pkt);
417
418         void Send(NetworkPacket* pkt);
419
420         void interact(u8 action, const PointedThing& pointed);
421
422         void sendNodemetaFields(v3s16 p, const std::string &formname,
423                 const StringMap &fields);
424         void sendInventoryFields(const std::string &formname,
425                 const StringMap &fields);
426         void sendInventoryAction(InventoryAction *a);
427         void sendChatMessage(const std::wstring &message);
428         void sendChangePassword(const std::string &oldpassword,
429                 const std::string &newpassword);
430         void sendDamage(u8 damage);
431         void sendBreath(u16 breath);
432         void sendRespawn();
433         void sendReady();
434
435         ClientEnvironment& getEnv() { return m_env; }
436         ITextureSource *tsrc() { return getTextureSource(); }
437         ISoundManager *sound() { return getSoundManager(); }
438         static const std::string &getBuiltinLuaPath();
439         static const std::string &getClientModsLuaPath();
440
441         virtual const std::vector<ModSpec> &getMods() const;
442         virtual const ModSpec* getModSpec(const std::string &modname) const;
443
444         // Causes urgent mesh updates (unlike Map::add/removeNodeWithEvent)
445         void removeNode(v3s16 p);
446         MapNode getNode(v3s16 p, bool *is_valid_position);
447         void addNode(v3s16 p, MapNode n, bool remove_metadata = true);
448
449         void setPlayerControl(PlayerControl &control);
450
451         void selectPlayerItem(u16 item);
452         u16 getPlayerItem() const
453         { return m_playeritem; }
454
455         // Returns true if the inventory of the local player has been
456         // updated from the server. If it is true, it is set to false.
457         bool getLocalInventoryUpdated();
458         // Copies the inventory of the local player to parameter
459         void getLocalInventory(Inventory &dst);
460
461         /* InventoryManager interface */
462         Inventory* getInventory(const InventoryLocation &loc);
463         void inventoryAction(InventoryAction *a);
464
465         const std::list<std::string> &getConnectedPlayerNames()
466         {
467                 return m_env.getPlayerNames();
468         }
469
470         float getAnimationTime();
471
472         int getCrackLevel();
473         void setCrack(int level, v3s16 pos);
474
475         u16 getHP();
476
477         bool checkPrivilege(const std::string &priv) const
478         { return (m_privileges.count(priv) != 0); }
479
480         bool getChatMessage(std::wstring &message);
481         void typeChatMessage(const std::wstring& message);
482
483         u64 getMapSeed(){ return m_map_seed; }
484
485         void addUpdateMeshTask(v3s16 blockpos, bool ack_to_server=false, bool urgent=false);
486         // Including blocks at appropriate edges
487         void addUpdateMeshTaskWithEdge(v3s16 blockpos, bool ack_to_server=false, bool urgent=false);
488         void addUpdateMeshTaskForNode(v3s16 nodepos, bool ack_to_server=false, bool urgent=false);
489
490         void updateCameraOffset(v3s16 camera_offset)
491         { m_mesh_update_thread.m_camera_offset = camera_offset; }
492
493         // Get event from queue. CE_NONE is returned if queue is empty.
494         ClientEvent getClientEvent();
495
496         bool accessDenied() const { return m_access_denied; }
497
498         bool reconnectRequested() const { return m_access_denied_reconnect; }
499
500         void setFatalError(const std::string &reason)
501         {
502                 m_access_denied = true;
503                 m_access_denied_reason = reason;
504         }
505
506         // Renaming accessDeniedReason to better name could be good as it's used to
507         // disconnect client when CSM failed.
508         const std::string &accessDeniedReason() const { return m_access_denied_reason; }
509
510         bool itemdefReceived()
511         { return m_itemdef_received; }
512         bool nodedefReceived()
513         { return m_nodedef_received; }
514         bool mediaReceived()
515         { return m_media_downloader == NULL; }
516
517         u8 getProtoVersion()
518         { return m_proto_ver; }
519
520         bool connectedToServer()
521         { return m_con.Connected(); }
522
523         float mediaReceiveProgress();
524
525         void afterContentReceived(IrrlichtDevice *device);
526
527         float getRTT();
528         float getCurRate();
529
530         Minimap* getMinimap() { return m_minimap; }
531         void setCamera(Camera* camera) { m_camera = camera; }
532
533         Camera* getCamera ()
534         { return m_camera; }
535
536         bool shouldShowMinimap() const;
537
538         // IGameDef interface
539         virtual IItemDefManager* getItemDefManager();
540         virtual INodeDefManager* getNodeDefManager();
541         virtual ICraftDefManager* getCraftDefManager();
542         ITextureSource* getTextureSource();
543         virtual IShaderSource* getShaderSource();
544         IShaderSource *shsrc() { return getShaderSource(); }
545         scene::ISceneManager* getSceneManager();
546         virtual u16 allocateUnknownNodeId(const std::string &name);
547         virtual ISoundManager* getSoundManager();
548         virtual MtEventManager* getEventManager();
549         virtual ParticleManager* getParticleManager();
550         bool checkLocalPrivilege(const std::string &priv)
551         { return checkPrivilege(priv); }
552         virtual scene::IAnimatedMesh* getMesh(const std::string &filename);
553
554         virtual std::string getModStoragePath() const;
555         virtual bool registerModStorage(ModMetadata *meta);
556         virtual void unregisterModStorage(const std::string &name);
557
558         // The following set of functions is used by ClientMediaDownloader
559         // Insert a media file appropriately into the appropriate manager
560         bool loadMedia(const std::string &data, const std::string &filename);
561         // Send a request for conventional media transfer
562         void request_media(const std::vector<std::string> &file_requests);
563         // Send a notification that no conventional media transfer is needed
564         void received_media();
565
566         LocalClientState getState() { return m_state; }
567
568         void makeScreenshot(IrrlichtDevice *device);
569
570         inline void pushToChatQueue(const std::wstring &input)
571         {
572                 m_chat_queue.push(input);
573         }
574
575         ClientScripting *getScript() { return m_script; }
576         const bool moddingEnabled() const { return m_modding_enabled; }
577
578         inline void pushToEventQueue(const ClientEvent &event)
579         {
580                 m_client_event_queue.push(event);
581         }
582
583         void showGameChat(const bool show = true);
584         void showGameHud(const bool show = true);
585         void showMinimap(const bool show = true);
586         void showProfiler(const bool show = true);
587         void showGameFog(const bool show = true);
588         void showGameDebug(const bool show = true);
589
590 private:
591
592         // Virtual methods from con::PeerHandler
593         void peerAdded(con::Peer *peer);
594         void deletingPeer(con::Peer *peer, bool timeout);
595
596         void initLocalMapSaving(const Address &address,
597                         const std::string &hostname,
598                         bool is_local_server);
599
600         void ReceiveAll();
601         void Receive();
602
603         void sendPlayerPos();
604         // Send the item number 'item' as player item to the server
605         void sendPlayerItem(u16 item);
606
607         void deleteAuthData();
608         // helper method shared with clientpackethandler
609         static AuthMechanism choseAuthMech(const u32 mechs);
610
611         void sendLegacyInit(const char* playerName, const char* playerPassword);
612         void sendInit(const std::string &playerName);
613         void startAuth(AuthMechanism chosen_auth_mechanism);
614         void sendDeletedBlocks(std::vector<v3s16> &blocks);
615         void sendGotBlocks(v3s16 block);
616         void sendRemovedSounds(std::vector<s32> &soundList);
617
618         // Helper function
619         inline std::string getPlayerName()
620         { return m_env.getLocalPlayer()->getName(); }
621
622         float m_packetcounter_timer;
623         float m_connection_reinit_timer;
624         float m_avg_rtt_timer;
625         float m_playerpos_send_timer;
626         float m_ignore_damage_timer; // Used after server moves player
627         IntervalLimiter m_map_timer_and_unload_interval;
628
629         IWritableTextureSource *m_tsrc;
630         IWritableShaderSource *m_shsrc;
631         IWritableItemDefManager *m_itemdef;
632         IWritableNodeDefManager *m_nodedef;
633         ISoundManager *m_sound;
634         MtEventManager *m_event;
635
636
637         MeshUpdateThread m_mesh_update_thread;
638         ClientEnvironment m_env;
639         ParticleManager m_particle_manager;
640         con::Connection m_con;
641         IrrlichtDevice *m_device;
642         Camera *m_camera;
643         Minimap *m_minimap;
644         bool m_minimap_disabled_by_server;
645         // Server serialization version
646         u8 m_server_ser_ver;
647
648         // Used version of the protocol with server
649         // Values smaller than 25 only mean they are smaller than 25,
650         // and aren't accurate. We simply just don't know, because
651         // the server didn't send the version back then.
652         // If 0, server init hasn't been received yet.
653         u8 m_proto_ver;
654
655         u16 m_playeritem;
656         bool m_inventory_updated;
657         Inventory *m_inventory_from_server;
658         float m_inventory_from_server_age;
659         PacketCounter m_packetcounter;
660         // Block mesh animation parameters
661         float m_animation_time;
662         int m_crack_level;
663         v3s16 m_crack_pos;
664         // 0 <= m_daynight_i < DAYNIGHT_CACHE_COUNT
665         //s32 m_daynight_i;
666         //u32 m_daynight_ratio;
667         std::queue<std::wstring> m_chat_queue;
668
669         // The authentication methods we can use to enter sudo mode (=change password)
670         u32 m_sudo_auth_methods;
671
672         // The seed returned by the server in TOCLIENT_INIT is stored here
673         u64 m_map_seed;
674
675         // Auth data
676         std::string m_playername;
677         std::string m_password;
678         // If set, this will be sent (and cleared) upon a TOCLIENT_ACCEPT_SUDO_MODE
679         std::string m_new_password;
680         // Usable by auth mechanisms.
681         AuthMechanism m_chosen_auth_mech;
682         void * m_auth_data;
683
684
685         bool m_access_denied;
686         bool m_access_denied_reconnect;
687         std::string m_access_denied_reason;
688         std::queue<ClientEvent> m_client_event_queue;
689         bool m_itemdef_received;
690         bool m_nodedef_received;
691         ClientMediaDownloader *m_media_downloader;
692
693         // time_of_day speed approximation for old protocol
694         bool m_time_of_day_set;
695         float m_last_time_of_day_f;
696         float m_time_of_day_update_timer;
697
698         // An interval for generally sending object positions and stuff
699         float m_recommended_send_interval;
700
701         // Sounds
702         float m_removed_sounds_check_timer;
703         // Mapping from server sound ids to our sound ids
704         UNORDERED_MAP<s32, int> m_sounds_server_to_client;
705         // And the other way!
706         UNORDERED_MAP<int, s32> m_sounds_client_to_server;
707         // And relations to objects
708         UNORDERED_MAP<int, u16> m_sounds_to_objects;
709
710         // Privileges
711         UNORDERED_SET<std::string> m_privileges;
712
713         // Detached inventories
714         // key = name
715         UNORDERED_MAP<std::string, Inventory*> m_detached_inventories;
716
717         // Storage for mesh data for creating multiple instances of the same mesh
718         StringMap m_mesh_data;
719
720         // own state
721         LocalClientState m_state;
722
723         // Used for saving server map to disk client-side
724         Database *m_localdb;
725         IntervalLimiter m_localdb_save_interval;
726         u16 m_cache_save_interval;
727
728         // TODO: Add callback to update these when g_settings changes
729         bool m_cache_smooth_lighting;
730         bool m_cache_enable_shaders;
731         bool m_cache_use_tangent_vertices;
732
733         ClientScripting *m_script;
734         bool m_modding_enabled;
735         UNORDERED_MAP<std::string, ModMetadata *> m_mod_storages;
736         float m_mod_storage_save_timer;
737         GameUIFlags *m_game_ui_flags;
738
739         DISABLE_CLASS_COPY(Client);
740 };
741
742 #endif // !CLIENT_HEADER