Move the Node.js stuff out of the public www directory.

[remoteglot] / server / hash-lookup.js

diff --git a/server/hash-lookup.js b/server/hash-lookup.js
new file mode 100644 (file)
index 0000000..13f9758
--- /dev/null
+++ b/server/hash-lookup.js
@@ -0,0 +1,108 @@
+var grpc = require('grpc');
+var Chess = require('../www/js/chess.min.js').Chess;
+
+var PROTO_PATH = __dirname + '/hashprobe.proto';
+var hashprobe_proto = grpc.load(PROTO_PATH).hashprobe;
+
+// TODO: Make destination configurable.
+var client = new hashprobe_proto.HashProbe('localhost:50051', grpc.credentials.createInsecure());
+
+var board = new Chess();
+
+var handle_request = function(fen, response) {
+       if (!board.validate_fen(fen).valid) {
+               response.writeHead(400, {});
+               response.end();
+               return;
+       }
+       client.probe({fen: fen}, function(err, probe_response) {
+               if (err) {
+                       response.writeHead(500, {});
+                       response.end();
+               } else {
+                       handle_response(fen, response, probe_response);
+               }
+       });
+}
+exports.handle_request = handle_request;
+
+var handle_response = function(fen, response, probe_response) {
+       var lines = {};
+
+       var root = translate_line(board, fen, probe_response['root']);
+       for (var i = 0; i < probe_response['line'].length; ++i) {
+               var line = probe_response['line'][i];
+               var uci_move = line['move']['from_sq'] + line['move']['to_sq'] + line['move']['promotion'];
+               lines[uci_move] = translate_line(board, fen, line);
+       }
+
+       var text = JSON.stringify({
+               root: root,
+               lines: lines
+       });
+       var headers = {
+               'Content-Type': 'text/json; charset=utf-8'
+               //'Content-Length': text.length
+       };
+       response.writeHead(200, headers);
+       response.write(text);
+       response.end();
+}
+
+var translate_line = function(board, fen, line) {
+       var r = {};
+       board.load(fen);
+       var toplay = board.turn();
+
+       if (line['move'] && line['move']['from_sq']) {
+               var promo = line['move']['promotion'];
+               if (promo) {
+                       r['pretty_move'] = board.move({ from: line['move']['from_sq'], to: line['move']['to_sq'], promotion: promo.toLowerCase() }).san;
+               } else {
+                       r['pretty_move'] = board.move({ from: line['move']['from_sq'], to: line['move']['to_sq'] }).san;
+               }
+       } else {
+               r['pretty_move'] = '';
+       }
+       r['sort_key'] = r['pretty_move'];
+       if (!line['found']) {
+               r['pv_pretty'] = [];
+               return r;
+       }
+       r['depth'] = line['depth'];
+
+       // Convert the PV.
+       var pv = [];
+       if (r['pretty_move']) {
+               pv.push(r['pretty_move']);
+       }
+       for (var j = 0; j < line['pv'].length; ++j) {
+               var move = line['pv'][j];
+               var decoded = board.move({ from: move['from_sq'], to: move['to_sq'], promotion: move['promotion'] });
+               if (decoded === null) {
+                       break;
+               }
+               pv.push(decoded.san);
+       }
+       r['pv_pretty'] = pv;
+
+       // Convert the score. Use the static eval if no search.
+       var value = line['value'] || line['eval'];
+       var score = null;
+       if (value['score_type'] === 'SCORE_CP') {
+               score = ['cp', value['score_cp']];
+       } else if (value['score_type'] === 'SCORE_MATE') {
+               score = ['m', value['score_mate']];
+       }
+       if (score) {
+               if (line['bound'] === 'BOUND_UPPER') {
+                       score.push('≤');
+               } else if (line['bound'] === 'BOUND_LOWER') {
+                       score.push('≥');
+               }
+       }
+
+       r['score'] = score;
+
+       return r;
+}