Subprocess support
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TODO.md
3
TODO.md
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@ -32,3 +32,6 @@
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some formulations of the game-restart logic in the flappy bird
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some formulations of the game-restart logic in the flappy bird
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demo.
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demo.
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- driver-streams-node/src/subprocess.js: perhaps figure out some way
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of blocking SIGQUIT, which I'm currently using to get debug output,
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in children, so they don't terminate too?
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@ -19,3 +19,4 @@
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Object.assign(module.exports, activate require('./streams.js'));
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Object.assign(module.exports, activate require('./streams.js'));
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Object.assign(module.exports, activate require('./net.js'));
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Object.assign(module.exports, activate require('./net.js'));
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Object.assign(module.exports, activate require('./subprocess.js'));
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@ -0,0 +1,87 @@
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//---------------------------------------------------------------------------
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// @syndicate-lang/driver-streams-node, Stream 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 S = activate require("./streams");
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const child_process = require('child_process');
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assertion type Subprocess(id, command, args, options);
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message type SubprocessError(id, err);
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assertion type SubprocessRunning(id, pid, stdio);
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assertion type SubprocessExit(id, code, signal);
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message type SubprocessKill(id, signal); // also on frame teardown
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export {
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Subprocess, SubprocessError,
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SubprocessRunning, SubprocessExit,
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SubprocessKill,
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};
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spawn named 'driver/Subprocess' {
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during Subprocess($id, $command, $args, $options) spawn named ['Subprocess', id] {
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const sp = child_process.spawn(command, args.toJS(), options ? options.toJS() : void 0);
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const stdio = sp.stdio.map((s, i) => {
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if (s !== null) {
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const fd = genUuid('fd');
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if (s.readable && s.writable) {
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on start react S.duplexStreamBehaviour(fd, s);
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} else if (s.readable) {
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on start react S.readableStreamBehaviour(fd, s);
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} else if (s.writable) {
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on start react S.writableStreamBehaviour(fd, s);
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}
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return fd;
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} else {
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return null;
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}
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});
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field this.isRunning = null;
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on stop if (this.isRunning !== false) sp.kill('SIGKILL');
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assert SubprocessRunning(id, sp.pid, stdio) when (this.isRunning === true);
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sp.on('exit', Dataspace.wrapExternal((code, signal) => {
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this.isRunning = false;
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react assert SubprocessExit(id, code, signal);
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}));
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sp.on('error', Dataspace.wrapExternal((err) => {
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this.isRunning = false;
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send SubprocessError(id, err);
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currentFacet().stop();
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}));
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process.nextTick(Dataspace.wrapExternal(() => {
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if (this.isRunning === null) {
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this.isRunning = true;
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}
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}));
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on message SubprocessKill(id, $signal) {
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if (this.isRunning !== false) {
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this.isRunning = false;
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sp.kill(signal);
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}
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}
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}
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}
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@ -0,0 +1,57 @@
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//---------------------------------------------------------------------------
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// @syndicate-lang/syntax-test, a demo of Syndicate extensions to 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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const { Observe, currentFacet, genUuid } = require("@syndicate-lang/core");
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const { sleep } = activate require("@syndicate-lang/driver-timer");
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const S = activate require("@syndicate-lang/driver-streams-node");
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const stdin = genUuid('stdin');
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const stdout = genUuid('stdout');
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spawn named 'stdioServer' {
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during Observe(S.Readable(stdin)) spawn S.readableStreamBehaviour(stdin, process.stdin);
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during Observe(S.Writable(stdout)) spawn S.writableStreamBehaviour(stdout, process.stdout);
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}
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spawn named 'chatclient-via-nc' {
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const id = genUuid('p');
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assert S.Subprocess(id, 'nc', ['localhost', '5999'], {stdio: ['pipe', 'pipe', 'ignore']});
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stop on message S.SubprocessError(id, $err) {
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console.error("Couldn't start subprocess", err);
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}
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stop on retracted S.Readable(stdin);
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stop on retracted S.Writable(stdout);
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on asserted S.SubprocessRunning(id, _, [$i, $o, _]) {
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react {
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on message S.Line(stdin, $line) {
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console.log('INPUT:', line);
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send S.Push(i, line.toString('utf-8') + '\n', null);
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}
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on message S.End(stdin) {
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console.log('INPUT EOF');
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send S.Close(i, null);
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}
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on message S.Line(o, $line) send S.Push(stdout, line.toString('utf-8') + '\n', null);
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}
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}
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stop on asserted S.SubprocessExit(id, $code, $signal) {
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if (code !== 0) {
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console.error('Subprocess exited with code', code, 'signal', signal);
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}
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}
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}
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@ -0,0 +1,46 @@
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//---------------------------------------------------------------------------
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// @syndicate-lang/syntax-test, a demo of Syndicate extensions to 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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const { currentFacet, genUuid } = require("@syndicate-lang/core");
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const { sleep } = activate require("@syndicate-lang/driver-timer");
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const S = activate require("@syndicate-lang/driver-streams-node");
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spawn named 'lister' {
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const go = () => {
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react {
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const id = genUuid('p');
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assert S.Subprocess(id, 'nc', ['localhost', '80'], {stdio: ['pipe', 'pipe', 'ignore']});
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stop on message S.SubprocessError(id, $err) {
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console.error("Couldn't start subprocess", err);
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}
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on asserted S.SubprocessRunning(id, _, [$i, $o, _]) {
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send S.Push(i, "GET / HTTP/1.0\r\n\r\n", null);
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send S.Close(i, null);
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react {
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on message S.Data(o, $chunk) console.log(chunk);
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on asserted S.End(o) console.log('DONE!');
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}
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}
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stop on asserted S.SubprocessExit(id, $code, $signal) {
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console.log('No longer running', new Date(), code, signal);
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sleep(1000, go);
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}
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}
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};
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on start go();
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}
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