118 lines
3.9 KiB
JavaScript
118 lines
3.9 KiB
JavaScript
//---------------------------------------------------------------------------
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// @syndicate-lang/driver-tcp-node, TCP support for Syndicate/js
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// Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//---------------------------------------------------------------------------
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import { currentFacet, Observe, Dataspace, genUuid, Bytes } from "@syndicate-lang/core";
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const net = require('net');
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const { sleep } = activate require("@syndicate-lang/driver-timer");
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assertion type TcpConnection(id, spec);
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assertion type TcpAccepted(id);
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assertion type TcpRejected(id, reason);
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message type LineIn(id, line);
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message type DataIn(id, chunk);
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message type DataOut(id, chunk);
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assertion type TcpAddress(host, port);
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assertion type TcpListener(port);
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export {
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TcpConnection, TcpAccepted, TcpRejected,
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DataOut, DataIn, LineIn,
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TcpAddress, TcpListener,
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};
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spawn named 'driver/TcpDriver' {
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during Observe(TcpConnection(_, TcpListener($port))) spawn named ['driver/TcpListener', port] {
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let finish = Dataspace.backgroundTask();
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on stop finish();
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let server = net.createServer(Dataspace.wrapExternal((socket) => {
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let id = genUuid('tcp' + port);
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spawn named ['driver/TcpInbound', id] {
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assert TcpConnection(id, TcpListener(port));
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on asserted TcpAccepted(id) _connectionCommon.call(this, currentFacet(), id, socket, true);
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stop on retracted TcpAccepted(id);
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stop on asserted TcpRejected(id, _);
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}
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}));
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server.listen(port, '0.0.0.0');
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on stop try { server.close() } catch (e) { console.error(e); }
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}
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during TcpConnection($id, TcpAddress($host, $port))
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spawn named ['driver/TcpOutbound', id, host, port] {
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let finish = Dataspace.backgroundTask();
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on stop finish();
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let socket = new net.Socket();
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on start {
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socket.connect(port, host);
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_connectionCommon.call(this, currentFacet(), id, socket, false);
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}
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}
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during Observe(LineIn($id, _)) spawn named ['driver/TcpLineReader', id] {
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field this.buffer = Bytes();
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on message DataIn(id, $data) this.buffer = Bytes.concat([this.buffer, data]);
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dataflow {
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const pos = this.buffer.indexOf(10);
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if (pos !== -1) {
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const line = this.buffer.slice(0, pos);
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this.buffer = this.buffer.slice(pos + 1);
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send LineIn(id, line);
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}
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}
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}
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}
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function _connectionCommon(rootFacet, id, socket, established) {
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react {
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field this.ready = established;
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socket.on('ready', Dataspace.wrapExternal(() => {
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if (!established) react assert TcpAccepted(id);
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this.ready = true;
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}));
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socket.on('error', Dataspace.wrapExternal((err) => {
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if (!this.ready) {
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// Pre-connection error: "rejected"
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react assert TcpRejected(id, err);
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} else {
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// Post-establishment error
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console.error(err);
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rootFacet.stop();
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}
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}));
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socket.on('close', Dataspace.wrapExternal(() => { rootFacet.stop(); }));
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on stop try { socket.destroy() } catch (e) { console.error(e); }
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on start react stop on asserted Observe(DataIn(id, _)) {
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socket.on('data', Dataspace.wrapExternal((data) => { send DataIn(id, Bytes.fromIO(data)); }));
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}
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on message DataOut(id, $data) {
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socket.write(Bytes.toIO(data));
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}
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}
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}
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