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job.js
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job.js
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const logplease = require('logplease');
const logger = logplease.create('job');
const { v4: uuidv4 } = require('uuid');
const cp = require('child_process');
const path = require('path');
const config = require('./config');
const globals = require('./globals');
const fs = require('fs/promises');
const fss = require('fs');
const wait_pid = require('waitpid');
const job_states = {
READY: Symbol('Ready to be primed'),
PRIMED: Symbol('Primed and ready for execution'),
EXECUTED: Symbol('Executed and ready for cleanup'),
};
let uid = 0;
let gid = 0;
let remaining_job_spaces = config.max_concurrent_jobs;
let job_queue = [];
class Job {
#active_timeouts;
#active_parent_processes;
constructor({ runtime, files, args, stdin, timeouts, memory_limits }) {
this.uuid = uuidv4();
this.logger = logplease.create(`job/${this.uuid}`);
this.runtime = runtime;
this.files = files.map((file, i) => ({
name: file.name || `file${i}.code`,
content: file.content,
encoding: ['base64', 'hex', 'utf8'].includes(file.encoding)
? file.encoding
: 'utf8',
}));
this.args = args;
this.stdin = stdin;
// Add a trailing newline if it doesn't exist
if (this.stdin.slice(-1) !== '\n') {
this.stdin += '\n';
}
this.#active_timeouts = [];
this.#active_parent_processes = [];
this.timeouts = timeouts;
this.memory_limits = memory_limits;
this.uid = config.runner_uid_min + uid;
this.gid = config.runner_gid_min + gid;
uid++;
gid++;
uid %= config.runner_uid_max - config.runner_uid_min + 1;
gid %= config.runner_gid_max - config.runner_gid_min + 1;
this.logger.debug(`Assigned uid=${this.uid} gid=${this.gid}`);
this.state = job_states.READY;
this.dir = path.join(
config.data_directory,
globals.data_directories.jobs,
this.uuid
);
}
async prime() {
if (remaining_job_spaces < 1) {
this.logger.info(`Awaiting job slot`);
await new Promise(resolve => {
job_queue.push(resolve);
});
}
this.logger.info(`Priming job`);
remaining_job_spaces--;
this.logger.debug('Writing files to job cache');
this.logger.debug(`Transfering ownership`);
await fs.mkdir(this.dir, { mode: 0o700 });
await fs.chown(this.dir, this.uid, this.gid);
for (const file of this.files) {
const file_path = path.join(this.dir, file.name);
const rel = path.relative(this.dir, file_path);
const file_content = Buffer.from(file.content, file.encoding);
if (rel.startsWith('..'))
throw Error(
`File path "${file.name}" tries to escape parent directory: ${rel}`
);
await fs.mkdir(path.dirname(file_path), {
recursive: true,
mode: 0o700,
});
await fs.chown(path.dirname(file_path), this.uid, this.gid);
await fs.write_file(file_path, file_content);
await fs.chown(file_path, this.uid, this.gid);
}
this.state = job_states.PRIMED;
this.logger.debug('Primed job');
}
exit_cleanup() {
for (const timeout of this.#active_timeouts) {
clear_timeout(timeout);
}
this.#active_timeouts = [];
this.logger.debug('Cleared the active timeouts');
this.cleanup_processes();
this.logger.debug(`Finished exit cleanup`);
}
close_cleanup() {
for (const proc of this.#active_parent_processes) {
proc.stderr.destroy();
if (!proc.stdin.destroyed) {
proc.stdin.end();
proc.stdin.destroy();
}
proc.stdout.destroy();
}
this.#active_parent_processes = [];
this.logger.debug('Destroyed processes writables');
}
async safe_call(file, args, timeout, memory_limit, event_bus = null) {
return new Promise((resolve, reject) => {
const nonetwork = config.disable_networking ? ['nosocket'] : [];
const prlimit = [
'prlimit',
'--nproc=' + this.runtime.max_process_count,
'--nofile=' + this.runtime.max_open_files,
'--fsize=' + this.runtime.max_file_size,
];
const timeout_call = [
'timeout',
'-s',
'9',
Math.ceil(timeout / 1000),
];
if (memory_limit >= 0) {
prlimit.push('--as=' + memory_limit);
}
const proc_call = [
'nice',
...timeout_call,
...prlimit,
...nonetwork,
'bash',
file,
...args,
];
var stdout = '';
var stderr = '';
var output = '';
const proc = cp.spawn(proc_call[0], proc_call.splice(1), {
env: {
...this.runtime.env_vars,
PISTON_LANGUAGE: this.runtime.language,
},
stdio: 'pipe',
cwd: this.dir,
uid: this.uid,
gid: this.gid,
detached: true, //give this process its own process group
});
this.#active_parent_processes.push(proc);
if (event_bus === null) {
proc.stdin.write(this.stdin);
proc.stdin.end();
proc.stdin.destroy();
} else {
event_bus.on('stdin', data => {
proc.stdin.write(data);
});
event_bus.on('kill', signal => {
proc.kill(signal);
});
}
const kill_timeout =
(timeout >= 0 &&
set_timeout(async _ => {
this.logger.info(`Timeout exceeded timeout=${timeout}`);
try {
process.kill(proc.pid, 'SIGKILL');
}
catch (e) {
// Could already be dead and just needs to be waited on
this.logger.debug(
`Got error while SIGKILLing process ${proc}:`,
e
);
}
}, timeout)) ||
null;
this.#active_timeouts.push(kill_timeout);
proc.stderr.on('data', async data => {
if (event_bus !== null) {
event_bus.emit('stderr', data);
} else if ((stderr.length + data.length) > this.runtime.output_max_size) {
this.logger.info(`stderr length exceeded`);
try {
process.kill(proc.pid, 'SIGKILL');
}
catch (e) {
// Could already be dead and just needs to be waited on
this.logger.debug(
`Got error while SIGKILLing process ${proc}:`,
e
);
}
} else {
stderr += data;
output += data;
}
});
proc.stdout.on('data', async data => {
if (event_bus !== null) {
event_bus.emit('stdout', data);
} else if ((stdout.length + data.length) > this.runtime.output_max_size) {
this.logger.info(`stdout length exceeded`);
try {
process.kill(proc.pid, 'SIGKILL');
}
catch (e) {
// Could already be dead and just needs to be waited on
this.logger.debug(
`Got error while SIGKILLing process ${proc}:`,
e
);
}
} else {
stdout += data;
output += data;
}
});
proc.on('exit', () => this.exit_cleanup());
proc.on('close', (code, signal) => {
this.close_cleanup();
resolve({ stdout, stderr, code, signal, output });
});
proc.on('error', err => {
this.exit_cleanup();
this.close_cleanup();
reject({ error: err, stdout, stderr, output });
});
});
}
async execute(event_bus = null) {
if (this.state !== job_states.PRIMED) {
throw new Error(
'Job must be in primed state, current state: ' +
this.state.toString()
);
}
this.logger.info(`Executing job runtime=${this.runtime.toString()}`);
const code_files =
(this.runtime.language === 'file' && this.files) ||
this.files.filter(file => file.encoding == 'utf8');
this.logger.debug('Compiling');
let compile;
let compile_errored = false;
const { emit_event_bus_result, emit_event_bus_stage } =
event_bus === null
? {
emit_event_bus_result: () => { },
emit_event_bus_stage: () => { },
}
: {
emit_event_bus_result: (stage, result, event_bus) => {
const { error, code, signal } = result;
event_bus.emit('exit', stage, {
error,
code,
signal,
});
},
emit_event_bus_stage: (stage, event_bus) => {
event_bus.emit('stage', stage);
},
};
if (this.runtime.compiled) {
this.logger.debug('Compiling');
emit_event_bus_stage('compile', event_bus);
compile = await this.safe_call(
path.join(this.runtime.pkgdir, 'compile'),
code_files.map(x => x.name),
this.timeouts.compile,
this.memory_limits.compile,
event_bus
);
emit_event_bus_result('compile', compile, event_bus);
compile_errored = compile.code !== 0;
}
let run;
if (!compile_errored) {
this.logger.debug('Running');
emit_event_bus_stage('run', event_bus);
run = await this.safe_call(
path.join(this.runtime.pkgdir, 'run'),
[code_files[0].name, ...this.args],
this.timeouts.run,
this.memory_limits.run,
event_bus
);
emit_event_bus_result('run', run, event_bus);
}
this.state = job_states.EXECUTED;
return {
compile,
run,
language: this.runtime.language,
version: this.runtime.version.raw,
};
}
cleanup_processes(dont_wait = []) {
let processes = [1];
const to_wait = [];
this.logger.debug(`Cleaning up processes`);
while (processes.length > 0) {
processes = [];
const proc_ids = fss.readdir_sync('/proc');
processes = proc_ids.map(proc_id => {
if (isNaN(proc_id)) return -1;
try {
const proc_status = fss.read_file_sync(
path.join('/proc', proc_id, 'status')
);
const proc_lines = proc_status.to_string().split('\n');
const state_line = proc_lines.find(line =>
line.starts_with('State:')
);
const uid_line = proc_lines.find(line =>
line.starts_with('Uid:')
);
const [_, ruid, euid, suid, fuid] = uid_line.split(/\s+/);
const [_1, state, user_friendly] = state_line.split(/\s+/);
const proc_id_int = parse_int(proc_id);
// Skip over any processes that aren't ours.
if (ruid != this.uid && euid != this.uid) return -1;
if (state == 'Z') {
// Zombie process, just needs to be waited, regardless of the user id
if (!to_wait.includes(proc_id_int))
to_wait.push(proc_id_int);
return -1;
}
// We should kill in all other state (Sleep, Stopped & Running)
return proc_id_int;
} catch {
return -1;
}
return -1;
});
processes = processes.filter(p => p > 0);
if (processes.length > 0)
this.logger.debug(`Got processes to kill: ${processes}`);
for (const proc of processes) {
// First stop the processes, but keep their resources allocated so they cant re-fork
try {
process.kill(proc, 'SIGSTOP');
} catch (e) {
// Could already be dead
this.logger.debug(
`Got error while SIGSTOPping process ${proc}:`,
e
);
}
}
for (const proc of processes) {
// Then clear them out of the process tree
try {
process.kill(proc, 'SIGKILL');
} catch (e) {
// Could already be dead and just needs to be waited on
this.logger.debug(
`Got error while SIGKILLing process ${proc}:`,
e
);
}
to_wait.push(proc);
}
}
this.logger.debug(
`Finished kill-loop, calling wait_pid to end any zombie processes`
);
for (const proc of to_wait) {
if (dont_wait.includes(proc)) continue;
wait_pid(proc);
}
this.logger.debug(`Cleaned up processes`);
}
async cleanup_filesystem() {
for (const clean_path of globals.clean_directories) {
const contents = await fs.readdir(clean_path);
for (const file of contents) {
const file_path = path.join(clean_path, file);
try {
const stat = await fs.stat(file_path);
if (stat.uid === this.uid) {
await fs.rm(file_path, {
recursive: true,
force: true,
});
}
} catch (e) {
// File was somehow deleted in the time that we read the dir to when we checked the file
this.logger.warn(`Error removing file ${file_path}: ${e}`);
}
}
}
await fs.rm(this.dir, { recursive: true, force: true });
}
async cleanup() {
this.logger.info(`Cleaning up job`);
this.exit_cleanup(); // Run process janitor, just incase there are any residual processes somehow
this.close_cleanup();
await this.cleanup_filesystem();
remaining_job_spaces++;
if (job_queue.length > 0) {
job_queue.shift()();
}
}
}
module.exports = {
Job,
};