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Subprocess support

This commit is contained in:
Tony Garnock-Jones 2018-11-26 15:45:32 +00:00
parent 3713745a45
commit e62b117691
5 changed files with 194 additions and 0 deletions
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3
TODO.md
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@ -32,3 +32,6 @@
some formulations of the game-restart logic in the flappy bird
demo.
- driver-streams-node/src/subprocess.js: perhaps figure out some way
of blocking SIGQUIT, which I'm currently using to get debug output,
in children, so they don't terminate too?

1
packages/driver-streams-node/src/index.js
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@ -19,3 +19,4 @@
Object.assign(module.exports, activate require('./streams.js'));
Object.assign(module.exports, activate require('./net.js'));
Object.assign(module.exports, activate require('./subprocess.js'));

87
packages/driver-streams-node/src/subprocess.js Normal file
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@ -0,0 +1,87 @@
//---------------------------------------------------------------------------
// @syndicate-lang/driver-streams-node, Stream support for Syndicate/js
// Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//---------------------------------------------------------------------------
import { currentFacet, Observe, Dataspace, genUuid, Bytes } from "@syndicate-lang/core";
const S = activate require("./streams");
const child_process = require('child_process');
assertion type Subprocess(id, command, args, options);
message type SubprocessError(id, err);
assertion type SubprocessRunning(id, pid, stdio);
assertion type SubprocessExit(id, code, signal);
message type SubprocessKill(id, signal); // also on frame teardown
export {
Subprocess, SubprocessError,
SubprocessRunning, SubprocessExit,
SubprocessKill,
};
spawn named 'driver/Subprocess' {
during Subprocess($id, $command, $args, $options) spawn named ['Subprocess', id] {
const sp = child_process.spawn(command, args.toJS(), options ? options.toJS() : void 0);
const stdio = sp.stdio.map((s, i) => {
if (s !== null) {
const fd = genUuid('fd');
if (s.readable && s.writable) {
on start react S.duplexStreamBehaviour(fd, s);
} else if (s.readable) {
on start react S.readableStreamBehaviour(fd, s);
} else if (s.writable) {
on start react S.writableStreamBehaviour(fd, s);
}
return fd;
} else {
return null;
}
});
field this.isRunning = null;
on stop if (this.isRunning !== false) sp.kill('SIGKILL');
assert SubprocessRunning(id, sp.pid, stdio) when (this.isRunning === true);
sp.on('exit', Dataspace.wrapExternal((code, signal) => {
this.isRunning = false;
react assert SubprocessExit(id, code, signal);
}));
sp.on('error', Dataspace.wrapExternal((err) => {
this.isRunning = false;
send SubprocessError(id, err);
currentFacet().stop();
}));
process.nextTick(Dataspace.wrapExternal(() => {
if (this.isRunning === null) {
this.isRunning = true;
}
}));
on message SubprocessKill(id, $signal) {
if (this.isRunning !== false) {
this.isRunning = false;
sp.kill(signal);
}
}
}
}

57
packages/syntax-playground/src/ncchatclient.js Normal file
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@ -0,0 +1,57 @@
//---------------------------------------------------------------------------
// @syndicate-lang/syntax-test, a demo of Syndicate extensions to JS.
// Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//---------------------------------------------------------------------------
const { Observe, currentFacet, genUuid } = require("@syndicate-lang/core");
const { sleep } = activate require("@syndicate-lang/driver-timer");
const S = activate require("@syndicate-lang/driver-streams-node");
const stdin = genUuid('stdin');
const stdout = genUuid('stdout');
spawn named 'stdioServer' {
during Observe(S.Readable(stdin)) spawn S.readableStreamBehaviour(stdin, process.stdin);
during Observe(S.Writable(stdout)) spawn S.writableStreamBehaviour(stdout, process.stdout);
}
spawn named 'chatclient-via-nc' {
const id = genUuid('p');
assert S.Subprocess(id, 'nc', ['localhost', '5999'], {stdio: ['pipe', 'pipe', 'ignore']});
stop on message S.SubprocessError(id, $err) {
console.error("Couldn't start subprocess", err);
}
stop on retracted S.Readable(stdin);
stop on retracted S.Writable(stdout);
on asserted S.SubprocessRunning(id, _, [$i, $o, _]) {
react {
on message S.Line(stdin, $line) {
console.log('INPUT:', line);
send S.Push(i, line.toString('utf-8') + '\n', null);
}
on message S.End(stdin) {
console.log('INPUT EOF');
send S.Close(i, null);
}
on message S.Line(o, $line) send S.Push(stdout, line.toString('utf-8') + '\n', null);
}
}
stop on asserted S.SubprocessExit(id, $code, $signal) {
if (code !== 0) {
console.error('Subprocess exited with code', code, 'signal', signal);
}
}
}

46
packages/syntax-playground/src/subprocess.js Normal file
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@ -0,0 +1,46 @@
//---------------------------------------------------------------------------
// @syndicate-lang/syntax-test, a demo of Syndicate extensions to JS.
// Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//---------------------------------------------------------------------------
const { currentFacet, genUuid } = require("@syndicate-lang/core");
const { sleep } = activate require("@syndicate-lang/driver-timer");
const S = activate require("@syndicate-lang/driver-streams-node");
spawn named 'lister' {
const go = () => {
react {
const id = genUuid('p');
assert S.Subprocess(id, 'nc', ['localhost', '80'], {stdio: ['pipe', 'pipe', 'ignore']});
stop on message S.SubprocessError(id, $err) {
console.error("Couldn't start subprocess", err);
}
on asserted S.SubprocessRunning(id, _, [$i, $o, _]) {
send S.Push(i, "GET / HTTP/1.0\r\n\r\n", null);
send S.Close(i, null);
react {
on message S.Data(o, $chunk) console.log(chunk);
on asserted S.End(o) console.log('DONE!');
}
}
stop on asserted S.SubprocessExit(id, $code, $signal) {
console.log('No longer running', new Date(), code, signal);
sleep(1000, go);
}
}
};
on start go();
}