Merge remote-tracking branch 'upstream/master' into HEAD
[stockfish] / src / main.cpp
index fafefee2bc02bd0fb0d716749a45c9468e044a05..98cbfc978f45142b0ae8638491c478ceb2684939 100644 (file)
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <deque>
 #include <iostream>
+#include <stack>
+#include <thread>
 
 #include "bitboard.h"
 #include "endgame.h"
 #include "uci.h"
 #include "syzygy/tbprobe.h"
 
+#include <grpc/grpc.h>
+#include <grpc++/server.h>
+#include <grpc++/server_builder.h>
+#include "hashprobe.h"
+#include "hashprobe.grpc.pb.h"
+#include "tt.h"
+
+using grpc::Server;
+using grpc::ServerBuilder;
+using grpc::ServerContext;
+using grpc::Status;
+using grpc::StatusCode;
+using namespace hashprobe;
+
+Status HashProbeImpl::Probe(ServerContext* context,
+                            const HashProbeRequest* request,
+                           HashProbeResponse *response) {
+       Position pos;
+       StateInfo st;
+       pos.set(request->fen(), /*isChess960=*/false, &st, Threads.main());
+       if (!pos.pos_is_ok()) {
+               return Status(StatusCode::INVALID_ARGUMENT, "Invalid FEN");
+       }
+
+       bool invert = (pos.side_to_move() == BLACK);
+       StateListPtr setup_states = StateListPtr(new std::deque<StateInfo>(1));
+
+       ProbeMove(&pos, setup_states.get(), invert, response->mutable_root());
+
+       MoveList<LEGAL> moves(pos);
+       for (const ExtMove* em = moves.begin(); em != moves.end(); ++em) {
+               HashProbeLine *line = response->add_line();
+               FillMove(&pos, em->move, line->mutable_move());
+               setup_states->push_back(StateInfo());
+               pos.do_move(em->move, setup_states->back());
+               ProbeMove(&pos, setup_states.get(), !invert, line);
+               pos.undo_move(em->move);
+       }
+
+       return Status::OK;
+}
+
+void HashProbeImpl::FillMove(Position *pos, Move move, HashProbeMove* decoded) {
+       if (!is_ok(move)) return;
+
+       Square from = from_sq(move);
+       Square to = to_sq(move);
+
+       if (type_of(move) == CASTLING) {
+               to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
+       }
+
+       Piece moved_piece = pos->moved_piece(move);
+       std::string pretty;
+       if (type_of(move) == CASTLING) {
+               if (to > from) {
+                       pretty = "O-O";
+               } else {
+                       pretty = "O-O-O";
+               }
+       } else if (type_of(moved_piece) == PAWN) {
+               if (type_of(move) == ENPASSANT || pos->piece_on(to) != NO_PIECE) {
+                       // Capture.
+                       pretty = char('a' + file_of(from));
+                       pretty += "x";
+               }
+               pretty += UCI::square(to);
+               if (type_of(move) == PROMOTION) {
+                       pretty += "=";
+                       pretty += " PNBRQK"[promotion_type(move)];
+               }
+       } else {
+               pretty = " PNBRQK"[type_of(moved_piece)];
+               Bitboard attackers = pos->attackers_to(to) & pos->pieces(color_of(moved_piece), type_of(moved_piece));
+               if (more_than_one(attackers)) {
+                       // Remove all illegal moves to disambiguate.
+                       Bitboard att_copy = attackers;
+                       while (att_copy) {
+                               Square s = pop_lsb(&att_copy);
+                               Move m = make_move(s, to);
+                               if (!pos->pseudo_legal(m) || !pos->legal(m)) {
+                                       attackers &= ~SquareBB[s];
+                               }
+                       }
+               }
+               if (more_than_one(attackers)) {
+                       // Disambiguate by file if possible.
+                       Bitboard attackers_this_file = attackers & file_bb(file_of(from));
+                       if (attackers != attackers_this_file) {
+                               pretty += char('a' + file_of(from));
+                               attackers = attackers_this_file;
+                       }
+                       if (more_than_one(attackers)) {
+                               // Still ambiguous, so need to disambiguate by rank.
+                               pretty += char('1' + rank_of(from));
+                       }
+               }
+
+               if (type_of(move) == ENPASSANT || pos->piece_on(to) != NO_PIECE) {
+                       pretty += "x";
+               }
+
+               pretty += UCI::square(to);
+       }
+
+       if (pos->gives_check(move)) {
+               // Check if mate.
+               StateInfo si;
+               pos->do_move(move, si, true);
+               if (MoveList<LEGAL>(*pos).size() > 0) {
+                       pretty += "+";
+               } else {
+                       pretty += "#";
+               }
+               pos->undo_move(move);
+       }
+
+       decoded->set_pretty(pretty);
+}
+
+void HashProbeImpl::ProbeMove(Position* pos, std::deque<StateInfo>* setup_states, bool invert, HashProbeLine* response) {
+       bool found;
+       TTEntry *entry = TT.probe(pos->key(), found);
+       response->set_found(found);
+       if (found) {
+               Value value = entry->value();
+               Value eval = entry->eval();
+               Bound bound = entry->bound();
+
+               if (invert) {
+                       value = -value;
+                       eval = -eval;
+                       if (bound == BOUND_UPPER) {
+                               bound = BOUND_LOWER;
+                       } else if (bound == BOUND_LOWER) {
+                               bound = BOUND_UPPER;
+                       }
+               }
+
+               response->set_depth(entry->depth());
+               FillValue(eval, response->mutable_eval());
+               if (entry->depth() > DEPTH_NONE) {
+                       FillValue(value, response->mutable_value());
+               }
+               response->set_bound(HashProbeLine::ValueBound(bound));
+
+               // Follow the PV until we hit an illegal move.
+               std::stack<Move> pv;
+               std::set<Key> seen;
+               while (found && is_ok(entry->move()) &&
+                      pos->pseudo_legal(entry->move()) &&
+                      pos->legal(entry->move())) {
+                       FillMove(pos, entry->move(), response->add_pv());
+                       if (seen.count(pos->key())) break;
+                       pv.push(entry->move());
+                       seen.insert(pos->key());
+                       setup_states->push_back(StateInfo());
+                       pos->do_move(entry->move(), setup_states->back());
+                       entry = TT.probe(pos->key(), found);
+               }
+
+               // Unroll the PV back again, so the Position object remains unchanged.
+               while (!pv.empty()) {
+                       pos->undo_move(pv.top());
+                       pv.pop();
+               }
+       }
+}
+
+void HashProbeImpl::FillValue(Value value, HashProbeScore* score) {
+       if (abs(value) < VALUE_MATE - MAX_PLY) {
+               score->set_score_type(HashProbeScore::SCORE_CP);
+               score->set_score_cp(value * 100 / PawnValueEg);
+       } else {
+               score->set_score_type(HashProbeScore::SCORE_MATE);
+               score->set_score_mate((value > 0 ? VALUE_MATE - value + 1 : -VALUE_MATE - value) / 2);
+       }
+}
+
+HashProbeThread::HashProbeThread(const std::string &server_address) {
+       builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
+       builder.RegisterService(&service);
+       server = std::move(builder.BuildAndStart());
+       std::cout << "Server listening on " << server_address << std::endl;
+       std::thread([this]{ server->Wait(); }).detach();
+}
+
+void HashProbeThread::Shutdown() {
+       server->Shutdown();
+}
+
 namespace PSQT {
   void init();
 }