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

   1 var grpc = require('grpc');
   2 var Chess = require(__dirname + '/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 handle_request = function(fen, response) {
  11         client.probe({fen: fen}, function(err, probe_response) {
  12                 if (err) {
  13                         response.writeHead(500, {});
  14                         response.end();
  15                 } else {
  16                         handle_response(fen, response, probe_response);
  17                 }
  18         });
  19 }
  20 exports.handle_request = handle_request;
  21
  22 var handle_response = function(fen, response, probe_response) {
  23         var board = new Chess();
  24
  25         var lines = {};
  26
  27         var root = translate_line(board, fen, probe_response['root'], true);
  28         for (var i = 0; i < probe_response['line'].length; ++i) {
  29                 var line = probe_response['line'][i];
  30                 var uci_move = line['move']['from_sq'] + line['move']['to_sq'] + line['move']['promotion'];
  31                 lines[uci_move] = translate_line(board, fen, line, false);
  32         }
  33
  34         var text = JSON.stringify({
  35                 root: root,
  36                 lines: lines
  37         });
  38         var headers = {
  39                 'Content-Type': 'text/json; charset=utf-8'
  40                 //'Content-Length': text.length
  41         };
  42         response.writeHead(200, headers);
  43         response.write(text);
  44         response.end();
  45 }
  46
  47 var translate_line = function(board, fen, line, pretty_score) {
  48         var r = {};
  49         board.load(fen);
  50         var toplay = board.turn();
  51
  52         if (line['move'] && line['move']['from_sq']) {
  53                 r['pretty_move'] = board.move({ from: line['move']['from_sq'], to: line['move']['to_sq'], promotion: line['move']['promotion'] }).san;
  54         } else {
  55                 r['pretty_move'] = '';
  56         }
  57         r['sort_key'] = r['pretty_move'];
  58         if (!line['found']) {
  59                 r['pv_pretty'] = [];
  60                 r['score_sort_key'] = -100000000;
  61                 return r;
  62         }
  63         r['depth'] = line['depth'];
  64
  65         // Convert the PV.
  66         var pv = [];
  67         if (r['pretty_move']) {
  68                 pv.push(r['pretty_move']);
  69         }
  70         for (var j = 0; j < line['pv'].length; ++j) {
  71                 var move = line['pv'][j];
  72                 var decoded = board.move({ from: move['from_sq'], to: move['to_sq'], promotion: move['promotion'] });
  73                 if (decoded === null) {
  74                         break;
  75                 }
  76                 pv.push(decoded.san);
  77         }
  78         r['pv_pretty'] = pv;
  79
  80         // Write out the pretty score.
  81         // TODO: mates!
  82         var score = pretty_score ? 'Score: ' : '';
  83
  84         if (line['bound'] === 'BOUND_UPPER') {
  85                 score += '≤\u00a0';
  86         } else if (line['bound'] === 'BOUND_LOWER') {
  87                 score += '≥\u00a0';
  88         }
  89
  90         var value = line['value']['score_cp'];
  91         if (value > 0) {
  92                 score += '+' + (value / 100.0).toFixed(2);
  93         } else if (value < 0) {
  94                 score += (value / 100.0).toFixed(2);
  95         } else if (value == 0) {
  96                 score += '0.00';
  97         } else {
  98                 score += '';
  99         }
 100         r['pretty_score'] = score;
 101         r['score_sort_key'] = score_sort_key(line['value'], toplay === 'b') * 200 + r['depth'];
 102
 103         return r;
 104 }
 105
 106 var score_sort_key = function(score, invert) {
 107         if (score['score_type'] === 'SCORE_MATE') {
 108                 var mate = score['score_mate'];
 109                 var score;
 110                 if (mate > 0) {
 111                         // Side to move mates
 112                         score = 99999 - mate;
 113                 } else {
 114                         // Side to move is getting mated (note the double negative for mate)
 115                         score = -99999 - mate;
 116                 }
 117                 if (invert) {
 118                         score = -score;
 119                 }
 120                 return score;
 121         } else if (score['score_type'] === 'SCORE_CP') {
 122                 var score = score['score_cp'];
 123                 if (invert) {
 124                         score = -score;
 125                 }
 126                 return score;
 127         }
 128
 129         return null;
 130 }