gtp.c

   1 #define DEBUG
   2 #include <assert.h>
   3 #include <ctype.h>
   4 #include <math.h>
   5 #include <stdarg.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10
  11 #include "board.h"
  12 #include "debug.h"
  13 #include "engine.h"
  14 #include "fbook.h"
  15 #include "gtp.h"
  16 #include "mq.h"
  17 #include "uct/uct.h"
  18 #include "version.h"
  19 #include "timeinfo.h"
  20
  21 #define NO_REPLY (-2)
  22
  23 /* Sleep 5 seconds after a game ends to give time to kill the program. */
  24 #define GAME_OVER_SLEEP 5
  25
  26 void
  27 gtp_prefix(char prefix, int id)
  28 {
  29         if (id == NO_REPLY) return;
  30         if (id >= 0)
  31                 printf("%c%d ", prefix, id);
  32         else
  33                 printf("%c ", prefix);
  34 }
  35
  36 void
  37 gtp_flush(void)
  38 {
  39         putchar('\n');
  40         fflush(stdout);
  41 }
  42
  43 void
  44 gtp_output(char prefix, int id, va_list params)
  45 {
  46         if (id == NO_REPLY) return;
  47         gtp_prefix(prefix, id);
  48         char *s;
  49         while ((s = va_arg(params, char *))) {
  50                 fputs(s, stdout);
  51         }
  52         putchar('\n');
  53         gtp_flush();
  54 }
  55
  56 void
  57 gtp_reply(int id, ...)
  58 {
  59         va_list params;
  60         va_start(params, id);
  61         gtp_output('=', id, params);
  62         va_end(params);
  63 }
  64
  65 void
  66 gtp_error(int id, ...)
  67 {
  68         va_list params;
  69         va_start(params, id);
  70         gtp_output('?', id, params);
  71         va_end(params);
  72 }
  73
  74 /* List of known gtp commands. The internal command pachi-genmoves is not exported,
  75  * it should only be used between master and slaves of the distributed engine. */
  76 static char *known_commands =
  77         "protocol_version\n"
  78         "echo\n"
  79         "name\n"
  80         "version\n"
  81         "list_commands\n"
  82         "known_command\n"
  83         "quit\n"
  84         "boardsize\n"
  85         "clear_board\n"
  86         "kgs-game_over\n"
  87         "komi\n"
  88         "kgs-rules\n"
  89         "play\n"
  90         "genmove\n"
  91         "kgs-genmove_cleanup\n"
  92         "pachi-genmoves\n"
  93         "pachi-genmoves_cleanup\n"
  94         "set_free_handicap\n"
  95         "place_free_handicap\n"
  96         "fixed_handicap\n"
  97         "final_score\n"
  98         "final_status_list\n"
  99         "undo\n"
 100         "pachi-evaluate\n"
 101         "pachi-result\n"
 102         "pachi-gentbook\n"
 103         "pachi-dumptbook\n"
 104         "kgs-chat\n"
 105         "time_left\n"
 106         "time_settings\n"
 107         "kgs-time_settings";
 108
 109
 110 /* Return true if cmd is a valid gtp command. */
 111 bool
 112 gtp_is_valid(char *cmd)
 113 {
 114         if (!cmd || !*cmd) return false;
 115         char *s = strcasestr(known_commands, cmd);
 116         if (!s) return false;
 117         if (s != known_commands && s[-1] != '\n') return false;
 118
 119         int len = strlen(cmd);
 120         return s[len] == '\0' || s[len] == '\n';
 121 }
 122
 123 /* XXX: THIS IS TOTALLY INSECURE!!!!
 124  * Even basic input checking is missing. */
 125
 126 enum parse_code
 127 gtp_parse(struct board *board, struct engine *engine, struct time_info *ti, char *buf)
 128 {
 129 #define next_tok(to_) \
 130         to_ = next; \
 131         next = next + strcspn(next, " \t\r\n"); \
 132         if (*next) { \
 133                 *next = 0; next++; \
 134                 next += strspn(next, " \t\r\n"); \
 135         }
 136
 137         if (strchr(buf, '#'))
 138                 *strchr(buf, '#') = 0;
 139
 140         char *cmd, *next = buf;
 141         next_tok(cmd);
 142
 143         int id = -1;
 144         if (isdigit(*cmd)) {
 145                 id = atoi(cmd);
 146                 next_tok(cmd);
 147         }
 148
 149         if (!*cmd)
 150                 return P_OK;
 151
 152         if (!strcasecmp(cmd, "protocol_version")) {
 153                 gtp_reply(id, "2", NULL);
 154                 return P_OK;
 155
 156         } else if (!strcasecmp(cmd, "name")) {
 157                 /* KGS hack */
 158                 gtp_reply(id, "Pachi ", engine->name, NULL);
 159                 return P_OK;
 160
 161         } else if (!strcasecmp(cmd, "echo")) {
 162                 gtp_reply(id, next, NULL);
 163                 return P_OK;
 164
 165         } else if (!strcasecmp(cmd, "version")) {
 166                 gtp_reply(id, PACHI_VERSION, ": ", engine->comment, NULL);
 167                 return P_OK;
 168
 169         } else if (!strcasecmp(cmd, "list_commands")) {
 170                 gtp_reply(id, known_commands, NULL);
 171                 return P_OK;
 172
 173         } else if (!strcasecmp(cmd, "known_command")) {
 174                 char *arg;
 175                 next_tok(arg);
 176                 if (gtp_is_valid(arg)) {
 177                         gtp_reply(id, "true", NULL);
 178                 } else {
 179                         gtp_reply(id, "false", NULL);
 180                 }
 181                 return P_OK;
 182         }
 183
 184         if (engine->notify && gtp_is_valid(cmd)) {
 185                 char *reply;
 186                 enum parse_code c = engine->notify(engine, board, id, cmd, next, &reply);
 187                 if (c == P_NOREPLY) {
 188                         id = NO_REPLY;
 189                 } else if (c == P_DONE_OK) {
 190                         gtp_reply(id, reply, NULL);
 191                         return P_OK;
 192                 } else if (c == P_DONE_ERROR) {
 193                         gtp_error(id, reply, NULL);
 194                         /* This is an internal error for the engine, but
 195                          * it is still OK from main's point of view. */
 196                         return P_OK;
 197                 } else if (c != P_OK) {
 198                         return c;
 199                 }
 200         }
 201
 202         if (!strcasecmp(cmd, "quit")) {
 203                 gtp_reply(id, NULL);
 204                 exit(0);
 205
 206         } else if (!strcasecmp(cmd, "boardsize")) {
 207                 char *arg;
 208                 next_tok(arg);
 209                 int size = atoi(arg);
 210                 if (size < 1 || size > BOARD_MAX_SIZE) {
 211                         gtp_error(id, "illegal board size", NULL);
 212                         return P_OK;
 213                 }
 214                 board_resize(board, size);
 215                 board_clear(board);
 216                 gtp_reply(id, NULL);
 217                 return P_ENGINE_RESET;
 218
 219         } else if (!strcasecmp(cmd, "clear_board")) {
 220                 board_clear(board);
 221                 if (DEBUGL(1) && debug_boardprint)
 222                         board_print(board, stderr);
 223                 gtp_reply(id, NULL);
 224                 return P_ENGINE_RESET;
 225
 226         } else if (!strcasecmp(cmd, "kgs-game_over")) {
 227                 /* The game may not be really over, just adjourned.
 228                  * Do not clear the board to avoid illegal moves
 229                  * if the game is resumed immediately after. KGS
 230                  * may start directly with genmove on resumption. */
 231                 if (DEBUGL(1)) {
 232                         fprintf(stderr, "game is over\n");
 233                         fflush(stderr);
 234                 }
 235                 /* Sleep before replying, so that kgs doesn't
 236                  * start another game immediately. */
 237                 sleep(GAME_OVER_SLEEP);
 238                 gtp_reply(id, NULL);
 239
 240         } else if (!strcasecmp(cmd, "komi")) {
 241                 char *arg;
 242                 next_tok(arg);
 243                 sscanf(arg, PRIfloating, &board->komi);
 244
 245                 if (DEBUGL(1) && debug_boardprint)
 246                         board_print(board, stderr);
 247                 gtp_reply(id, NULL);
 248
 249         } else if (!strcasecmp(cmd, "kgs-rules")) {
 250                 char *arg;
 251                 next_tok(arg);
 252                 if (!strcasecmp(arg, "japanese")) {
 253                         board->rules = RULES_JAPANESE;
 254                 } else if (!strcasecmp(arg, "chinese")) {
 255                         board->rules = RULES_CHINESE;
 256                 } else if (!strcasecmp(arg, "aga")) {
 257                         board->rules = RULES_AGA;
 258                 } else if (!strcasecmp(arg, "new_zealand")) {
 259                         board->rules = RULES_NEW_ZEALAND;
 260                 } else {
 261                         gtp_error(id, "unknown rules", NULL);
 262                         return P_OK;
 263                 }
 264                 gtp_reply(id, NULL);
 265
 266         } else if (!strcasecmp(cmd, "play")) {
 267                 struct move m;
 268
 269                 char *arg;
 270                 next_tok(arg);
 271                 m.color = str2stone(arg);
 272                 next_tok(arg);
 273                 coord_t *c = str2coord(arg, board_size(board));
 274                 m.coord = *c; coord_done(c);
 275                 char *reply = NULL;
 276
 277                 if (DEBUGL(1))
 278                         fprintf(stderr, "got move %d,%d,%d\n", m.color, coord_x(m.coord, board), coord_y(m.coord, board));
 279
 280                 // This is where kgs starts the timer, not at genmove!
 281                 time_start_timer(&ti[stone_other(m.color)]);
 282
 283                 if (engine->notify_play)
 284                         reply = engine->notify_play(engine, board, &m);
 285                 if (board_play(board, &m) < 0) {
 286                         if (DEBUGL(0)) {
 287                                 fprintf(stderr, "! ILLEGAL MOVE %d,%d,%d\n", m.color, coord_x(m.coord, board), coord_y(m.coord, board));
 288                                 board_print(board, stderr);
 289                         }
 290                         gtp_error(id, "illegal move", NULL);
 291                 } else {
 292                         if (DEBUGL(1) && debug_boardprint)
 293                                 board_print_custom(board, stderr, engine->printhook);
 294                         gtp_reply(id, reply, NULL);
 295                 }
 296
 297         } else if (!strcasecmp(cmd, "genmove") || !strcasecmp(cmd, "kgs-genmove_cleanup")) {
 298                 char *arg;
 299                 next_tok(arg);
 300                 enum stone color = str2stone(arg);
 301                 coord_t *c = NULL;
 302
 303                 if (!ti[color].len.t.timer_start) {
 304                         /* First game move. */
 305                         time_start_timer(&ti[color]);
 306                 }
 307
 308                 coord_t cf = pass;
 309                 if (board->fbook)
 310                         cf = fbook_check(board);
 311                 if (!is_pass(cf)) {
 312                         c = coord_copy(cf);
 313                 } else {
 314                         c = engine->genmove(engine, board, &ti[color], color, !strcasecmp(cmd, "kgs-genmove_cleanup"));
 315                 }
 316                 struct move m = { *c, color };
 317                 if (board_play(board, &m) < 0) {
 318                         fprintf(stderr, "Attempted to generate an illegal move: [%s, %s]\n", coord2sstr(m.coord, board), stone2str(m.color));
 319                         abort();
 320                 }
 321                 char *str = coord2str(*c, board);
 322                 if (DEBUGL(1))
 323                         fprintf(stderr, "playing move %s\n", str);
 324                 if (DEBUGL(1) && debug_boardprint) {
 325                         board_print_custom(board, stderr, engine->printhook);
 326                 }
 327                 gtp_reply(id, str, NULL);
 328                 free(str); coord_done(c);
 329
 330                 /* Account for spent time. If our GTP peer keeps our clock, this will
 331                  * be overriden by next time_left GTP command properly. */
 332                 /* (XXX: Except if we pass to byoyomi and the peer doesn't, but that
 333                  * should be absolutely rare situation and we will just spend a little
 334                  * less time than we could on next few moves.) */
 335                 if (ti[color].period != TT_NULL && ti[color].dim == TD_WALLTIME)
 336                         time_sub(&ti[color], time_now() - ti[color].len.t.timer_start, true);
 337
 338         } else if (!strcasecmp(cmd, "pachi-genmoves") || !strcasecmp(cmd, "pachi-genmoves_cleanup")) {
 339                 char *arg;
 340                 next_tok(arg);
 341                 enum stone color = str2stone(arg);
 342                 void *stats;
 343                 int stats_size;
 344
 345                 char *reply = engine->genmoves(engine, board, &ti[color], color, next,
 346                                                !strcasecmp(cmd, "pachi-genmoves_cleanup"),
 347                                                &stats, &stats_size);
 348                 if (!reply) {
 349                         gtp_error(id, "genmoves error", NULL);
 350                         return P_OK;
 351                 }
 352                 if (DEBUGL(3))
 353                         fprintf(stderr, "proposing moves %s\n", reply);
 354                 if (DEBUGL(4) && debug_boardprint)
 355                         board_print_custom(board, stderr, engine->printhook);
 356                 gtp_reply(id, reply, NULL);
 357                 if (stats_size > 0) {
 358                         double start = time_now();
 359                         fwrite(stats, 1, stats_size, stdout);
 360                         fflush(stdout);
 361                         if (DEBUGVV(2))
 362                                 fprintf(stderr, "sent reply %d bytes in %.4fms\n",
 363                                         stats_size, (time_now() - start)*1000);
 364                 }
 365
 366         } else if (!strcasecmp(cmd, "set_free_handicap")) {
 367                 struct move m;
 368                 m.color = S_BLACK;
 369
 370                 char *arg;
 371                 next_tok(arg);
 372                 do {
 373                         coord_t *c = str2coord(arg, board_size(board));
 374                         m.coord = *c; coord_done(c);
 375                         if (DEBUGL(1))
 376                                 fprintf(stderr, "setting handicap %d,%d\n", coord_x(m.coord, board), coord_y(m.coord, board));
 377
 378                         if (board_play(board, &m) < 0) {
 379                                 if (DEBUGL(0))
 380                                         fprintf(stderr, "! ILLEGAL MOVE %d,%d,%d\n", m.color, coord_x(m.coord, board), coord_y(m.coord, board));
 381                                 gtp_error(id, "illegal move", NULL);
 382                         }
 383                         board->handicap++;
 384                         next_tok(arg);
 385                 } while (*arg);
 386                 if (DEBUGL(1) && debug_boardprint)
 387                         board_print(board, stderr);
 388                 gtp_reply(id, NULL);
 389
 390         /* TODO: Engine should choose free handicap; however, it tends to take
 391          * overly long to think it all out, and unless it's clever its
 392          * handicap stones won't be of much help. ;-) */
 393         } else if (!strcasecmp(cmd, "place_free_handicap")
 394                   || !strcasecmp(cmd, "fixed_handicap")) {
 395                 char *arg;
 396                 next_tok(arg);
 397                 int stones = atoi(arg);
 398
 399                 gtp_prefix('=', id);
 400                 board_handicap(board, stones, id == NO_REPLY ? NULL : stdout);
 401                 if (DEBUGL(1) && debug_boardprint)
 402                         board_print(board, stderr);
 403                 if (id == NO_REPLY) return P_OK;
 404                 putchar('\n');
 405                 gtp_flush();
 406
 407         } else if (!strcasecmp(cmd, "final_score")) {
 408                 struct move_queue q = { .moves = 0 };
 409                 if (engine->dead_group_list)
 410                         engine->dead_group_list(engine, board, &q);
 411                 floating_t score = board_official_score(board, &q);
 412                 char str[64];
 413                 if (DEBUGL(1))
 414                         fprintf(stderr, "counted score %.1f\n", score);
 415                 if (score == 0) {
 416                         gtp_reply(id, "0", NULL);
 417                 } else if (score > 0) {
 418                         snprintf(str, 64, "W+%.1f", score);
 419                         gtp_reply(id, str, NULL);
 420                 } else {
 421                         snprintf(str, 64, "B+%.1f", -score);
 422                         gtp_reply(id, str, NULL);
 423                 }
 424
 425         /* XXX: This is a huge hack. */
 426         } else if (!strcasecmp(cmd, "final_status_list")) {
 427                 if (id == NO_REPLY) return P_OK;
 428                 char *arg;
 429                 next_tok(arg);
 430                 struct move_queue q = { .moves = 0 };
 431                 if (engine->dead_group_list)
 432                         engine->dead_group_list(engine, board, &q);
 433                 /* else we return empty list - i.e. engine not supporting
 434                  * this assumes all stones alive at the game end. */
 435                 if (!strcasecmp(arg, "dead")) {
 436                         gtp_prefix('=', id);
 437                         for (unsigned int i = 0; i < q.moves; i++) {
 438                                 foreach_in_group(board, q.move[i]) {
 439                                         printf("%s ", coord2sstr(c, board));
 440                                 } foreach_in_group_end;
 441                                 putchar('\n');
 442                         }
 443                         if (!q.moves)
 444                                 putchar('\n');
 445                         gtp_flush();
 446                 } else if (!strcasecmp(arg, "seki") || !strcasecmp(arg, "alive")) {
 447                         gtp_prefix('=', id);
 448                         bool printed_group = false;
 449                         foreach_point(board) { // foreach_group, effectively
 450                                 group_t g = group_at(board, c);
 451                                 if (!g || g != c) continue;
 452
 453                                 for (unsigned int i = 0; i < q.moves; i++) {
 454                                         if (q.move[i] == g)
 455                                                 goto next_group;
 456                                 }
 457                                 foreach_in_group(board, g) {
 458                                         printf("%s ", coord2sstr(c, board));
 459                                 } foreach_in_group_end;
 460                                 putchar('\n');
 461                                 printed_group = true;
 462 next_group:;
 463                         } foreach_point_end;
 464                         if (!printed_group)
 465                                 putchar('\n');
 466                         gtp_flush();
 467                 } else {
 468                         gtp_error(id, "illegal status specifier", NULL);
 469                 }
 470
 471         } else if (!strcasecmp(cmd, "undo")) {
 472                 if (board_undo(board) < 0) {
 473                         if (DEBUGL(1)) {
 474                                 fprintf(stderr, "undo on non-pass move %s\n", coord2sstr(board->last_move.coord, board));
 475                                 board_print(board, stderr);
 476                         }
 477                         gtp_error(id, "cannot undo", NULL);
 478                         return P_OK;
 479                 }
 480                 char *reply = NULL;
 481                 if (engine->undo)
 482                         reply = engine->undo(engine, board);
 483                 if (DEBUGL(1) && debug_boardprint)
 484                         board_print(board, stderr);
 485                 gtp_reply(id, reply, NULL);
 486
 487         /* Custom commands for handling the tree opening tbook */
 488         } else if (!strcasecmp(cmd, "pachi-gentbook")) {
 489                 /* Board must be initialized properly, as if for genmove;
 490                  * makes sense only as 'uct_gentbook b'. */
 491                 char *arg;
 492                 next_tok(arg);
 493                 enum stone color = str2stone(arg);
 494                 if (uct_gentbook(engine, board, &ti[color], color))
 495                         gtp_reply(id, NULL);
 496                 else
 497                         gtp_error(id, "error generating tbook", NULL);
 498
 499         } else if (!strcasecmp(cmd, "pachi-dumptbook")) {
 500                 char *arg;
 501                 next_tok(arg);
 502                 enum stone color = str2stone(arg);
 503                 uct_dumptbook(engine, board, color);
 504                 gtp_reply(id, NULL);
 505
 506         } else if (!strcasecmp(cmd, "pachi-evaluate")) {
 507                 char *arg;
 508                 next_tok(arg);
 509                 enum stone color = str2stone(arg);
 510
 511                 if (!engine->evaluate) {
 512                         gtp_error(id, "pachi-evaluate not supported by engine", NULL);
 513                 } else {
 514                         gtp_prefix('=', id);
 515                         floating_t vals[board->flen];
 516                         engine->evaluate(engine, board, &ti[color], vals, color);
 517                         for (int i = 0; i < board->flen; i++) {
 518                                 if (!board_coord_in_symmetry(board, board->f[i])
 519                                     || isnan(vals[i]) || vals[i] < 0.001)
 520                                         continue;
 521                                 printf("%s %.3f\n", coord2sstr(board->f[i], board), (double) vals[i]);
 522                         }
 523                         gtp_flush();
 524                 }
 525
 526         } else if (!strcasecmp(cmd, "pachi-result")) {
 527                 /* More detailed result of the last genmove. */
 528                 /* For UCT, the output format is: = color move playouts winrate dynkomi */
 529                 char *reply = NULL;
 530                 if (engine->result)
 531                         reply = engine->result(engine, board);
 532                 if (reply)
 533                         gtp_reply(id, reply, NULL);
 534                 else
 535                         gtp_error(id, "unknown pachi-result command", NULL);
 536
 537         } else if (!strcasecmp(cmd, "kgs-chat")) {
 538                 char *loc;
 539                 next_tok(loc);
 540                 char *src;
 541                 next_tok(src);
 542                 char *msg;
 543                 next_tok(msg);
 544                 char *reply = NULL;
 545                 if (engine->chat)
 546                         reply = engine->chat(engine, board, msg);
 547                 if (reply)
 548                         gtp_reply(id, reply, NULL);
 549                 else
 550                         gtp_error(id, "unknown kgs-chat command", NULL);
 551
 552         } else if (!strcasecmp(cmd, "time_left")) {
 553                 char *arg;
 554                 next_tok(arg);
 555                 enum stone color = str2stone(arg);
 556                 next_tok(arg);
 557                 int time = atoi(arg);
 558                 next_tok(arg);
 559                 int stones = atoi(arg);
 560                 if (!ti[color].ignore_gtp) {
 561                         time_left(&ti[color], time, stones);
 562                 } else {
 563                         if (DEBUGL(2)) fprintf(stderr, "ignored time info\n");
 564                 }
 565
 566                 gtp_reply(id, NULL);
 567
 568         } else if (!strcasecmp(cmd, "time_settings") || !strcasecmp(cmd, "kgs-time_settings")) {
 569                 char *time_system;
 570                 char *arg;
 571                 if (!strcasecmp(cmd, "kgs-time_settings")) {
 572                         next_tok(time_system);
 573                 } else {
 574                         time_system = "canadian";
 575                 }
 576
 577                 int main_time = 0, byoyomi_time = 0, byoyomi_stones = 0, byoyomi_periods = 0;
 578                 if (!strcasecmp(time_system, "none")) {
 579                         main_time = -1;
 580                 } else if (!strcasecmp(time_system, "absolute")) {
 581                         next_tok(arg);
 582                         main_time = atoi(arg);
 583                 } else if (!strcasecmp(time_system, "byoyomi")) {
 584                         next_tok(arg);
 585                         main_time = atoi(arg);
 586                         next_tok(arg);
 587                         byoyomi_time = atoi(arg);
 588                         next_tok(arg);
 589                         byoyomi_periods = atoi(arg);
 590                 } else if (!strcasecmp(time_system, "canadian")) {
 591                         next_tok(arg);
 592                         main_time = atoi(arg);
 593                         next_tok(arg);
 594                         byoyomi_time = atoi(arg);
 595                         next_tok(arg);
 596                         byoyomi_stones = atoi(arg);
 597                 }
 598
 599                 if (DEBUGL(1))
 600                         fprintf(stderr, "time_settings %d %d/%d*%d\n",
 601                                 main_time, byoyomi_time, byoyomi_stones, byoyomi_periods);
 602                 if (!ti[S_BLACK].ignore_gtp) {
 603                         time_settings(&ti[S_BLACK], main_time, byoyomi_time, byoyomi_stones, byoyomi_periods);
 604                         ti[S_WHITE] = ti[S_BLACK];
 605                 } else {
 606                         if (DEBUGL(1)) fprintf(stderr, "ignored time info\n");
 607                 }
 608
 609                 gtp_reply(id, NULL);
 610
 611         } else {
 612                 gtp_error(id, "unknown command", NULL);
 613                 return P_UNKNOWN_COMMAND;
 614         }
 615         return P_OK;
 616
 617 #undef next_tok
 618 }