git.sesse.net Git - remoteglot/blob - server/hash-lookup.js

   1 var grpc = require('grpc');
   2 var Chess = require('../www/js/chess.min.js').Chess;
   3
   4 var PROTO_PATH = __dirname + '/hashprobe.proto';
   5 var hashprobe_proto = grpc.load(PROTO_PATH).hashprobe;
   6
   7 // TODO: Make destination configurable.
   8 var client = new hashprobe_proto.HashProbe('localhost:50051', grpc.credentials.createInsecure());
   9
  10 var board = new Chess();
  11
  12 var handle_request = function(fen, response) {
  13         if (!board.validate_fen(fen).valid) {
  14                 response.writeHead(400, {});
  15                 response.end();
  16                 return;
  17         }
  18         client.probe({fen: fen}, function(err, probe_response) {
  19                 if (err) {
  20                         response.writeHead(500, {});
  21                         response.end();
  22                 } else {
  23                         handle_response(fen, response, probe_response);
  24                 }
  25         });
  26 }
  27 exports.handle_request = handle_request;
  28
  29 var handle_response = function(fen, response, probe_response) {
  30         var lines = {};
  31
  32         var root = translate_line(board, fen, probe_response['root']);
  33         for (var i = 0; i < probe_response['line'].length; ++i) {
  34                 var line = probe_response['line'][i];
  35                 var uci_move = line['move']['from_sq'] + line['move']['to_sq'] + line['move']['promotion'];
  36                 lines[uci_move] = translate_line(board, fen, line);
  37         }
  38
  39         var text = JSON.stringify({
  40                 root: root,
  41                 lines: lines
  42         });
  43         var headers = {
  44                 'Content-Type': 'text/json; charset=utf-8'
  45                 //'Content-Length': text.length
  46         };
  47         response.writeHead(200, headers);
  48         response.write(text);
  49         response.end();
  50 }
  51
  52 var translate_line = function(board, fen, line) {
  53         var r = {};
  54         board.load(fen);
  55         var toplay = board.turn();
  56
  57         if (line['move'] && line['move']['from_sq']) {
  58                 var promo = line['move']['promotion'];
  59                 if (promo) {
  60                         r['pretty_move'] = board.move({ from: line['move']['from_sq'], to: line['move']['to_sq'], promotion: promo.toLowerCase() }).san;
  61                 } else {
  62                         r['pretty_move'] = board.move({ from: line['move']['from_sq'], to: line['move']['to_sq'] }).san;
  63                 }
  64         } else {
  65                 r['pretty_move'] = '';
  66         }
  67         r['sort_key'] = r['pretty_move'];
  68         if (!line['found']) {
  69                 r['pv_pretty'] = [];
  70                 return r;
  71         }
  72         r['depth'] = line['depth'];
  73
  74         // Convert the PV.
  75         var pv = [];
  76         if (r['pretty_move']) {
  77                 pv.push(r['pretty_move']);
  78         }
  79         for (var j = 0; j < line['pv'].length; ++j) {
  80                 var move = line['pv'][j];
  81                 var decoded = board.move({ from: move['from_sq'], to: move['to_sq'], promotion: move['promotion'] });
  82                 if (decoded === null) {
  83                         break;
  84                 }
  85                 pv.push(decoded.san);
  86         }
  87         r['pv_pretty'] = pv;
  88
  89         // Convert the score. Use the static eval if no search.
  90         var value = line['value'] || line['eval'];
  91         var score = null;
  92         if (value['score_type'] === 'SCORE_CP') {
  93                 score = ['cp', value['score_cp']];
  94         } else if (value['score_type'] === 'SCORE_MATE') {
  95                 score = ['m', value['score_mate']];
  96         }
  97         if (score) {
  98                 if (line['bound'] === 'BOUND_UPPER') {
  99                         score.push('≤');
 100                 } else if (line['bound'] === 'BOUND_LOWER') {
 101                         score.push('≥');
 102                 }
 103         }
 104
 105         r['score'] = score;
 106
 107         return r;
 108 }