X-Git-Url: https://git.sesse.net/?p=remoteglot;a=blobdiff_plain;f=server%2Fhash-lookup.js;fp=server%2Fhash-lookup.js;h=13f97582e51dd18f3bb562582218ecea7bdeb79c;hp=0000000000000000000000000000000000000000;hb=83aa0538ddb9037d37295f7e6e68348773661d7a;hpb=fa63488e30a81f4370aa1e9a565b3d2331f553a6

diff --git a/server/hash-lookup.js b/server/hash-lookup.js
new file mode 100644
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;
+}