291 lines
8.6 KiB
JavaScript
291 lines
8.6 KiB
JavaScript
const logger = require('logplease').create('job');
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const { v4: uuidv4 } = require('uuid');
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const cp = require('child_process');
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const path = require('path');
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const config = require('./config');
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const globals = require('./globals');
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const fs = require('fs/promises');
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const wait_pid = require('waitpid');
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const job_states = {
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READY: Symbol('Ready to be primed'),
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PRIMED: Symbol('Primed and ready for execution'),
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EXECUTED: Symbol('Executed and ready for cleanup'),
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};
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let uid = 0;
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let gid = 0;
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class Job {
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constructor({ runtime, files, args, stdin, timeouts, memory_limits }) {
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this.uuid = uuidv4();
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this.runtime = runtime;
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this.files = files.map((file, i) => ({
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name: file.name || `file${i}.code`,
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content: file.content,
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}));
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this.args = args;
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this.stdin = stdin;
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this.timeouts = timeouts;
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this.memory_limits = memory_limits;
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this.uid = config.runner_uid_min + uid;
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this.gid = config.runner_gid_min + gid;
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uid++;
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gid++;
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uid %= config.runner_uid_max - config.runner_uid_min + 1;
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gid %= config.runner_gid_max - config.runner_gid_min + 1;
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this.state = job_states.READY;
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this.dir = path.join(
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config.data_directory,
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globals.data_directories.jobs,
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this.uuid
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);
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}
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async prime() {
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logger.info(`Priming job uuid=${this.uuid}`);
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logger.debug('Writing files to job cache');
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logger.debug(`Transfering ownership uid=${this.uid} gid=${this.gid}`);
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await fs.mkdir(this.dir, { mode: 0o700 });
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await fs.chown(this.dir, this.uid, this.gid);
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for (const file of this.files) {
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let file_path = path.join(this.dir, file.name);
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const rel = path.relative(this.dir, file_path);
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if(rel.startsWith(".."))
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throw Error(`File path "${file.name}" tries to escape parent directory: ${rel}`)
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await fs.mkdir(path.dirname(file_path), {recursive: true, mode: 0o700})
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await fs.chown(path.dirname(file_path), this.uid, this.gid);
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await fs.write_file(file_path, file.content);
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await fs.chown(file_path, this.uid, this.gid);
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}
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this.state = job_states.PRIMED;
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logger.debug('Primed job');
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}
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async safe_call(file, args, timeout, memory_limit) {
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return new Promise((resolve, reject) => {
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const nonetwork = config.disable_networking ? ['nosocket'] : [];
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const prlimit = [
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'prlimit',
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'--nproc=' + config.max_process_count,
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'--nofile=' + config.max_open_files,
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'--fsize=' + config.max_file_size,
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];
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if (memory_limit >= 0) {
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prlimit.push('--as=' + memory_limit);
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}
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const proc_call = [...prlimit, ...nonetwork, 'bash', file, ...args];
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var stdout = '';
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var stderr = '';
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var output = '';
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const proc = cp.spawn(proc_call[0], proc_call.splice(1), {
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env: {
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...this.runtime.env_vars,
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PISTON_LANGUAGE: this.runtime.language,
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},
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stdio: 'pipe',
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cwd: this.dir,
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uid: this.uid,
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gid: this.gid,
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detached: true, //give this process its own process group
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});
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proc.stdin.write(this.stdin);
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proc.stdin.end();
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proc.stdin.destroy();
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const kill_timeout = set_timeout(
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_ => proc.kill('SIGKILL'),
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timeout
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);
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proc.stderr.on('data', data => {
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if (stderr.length > config.output_max_size) {
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proc.kill('SIGKILL');
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} else {
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stderr += data;
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output += data;
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}
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});
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proc.stdout.on('data', data => {
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if (stdout.length > config.output_max_size) {
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proc.kill('SIGKILL');
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} else {
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stdout += data;
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output += data;
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}
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});
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const exit_cleanup = () => {
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clear_timeout(kill_timeout);
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proc.stderr.destroy();
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proc.stdout.destroy();
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};
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proc.on('exit', (code, signal) => {
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exit_cleanup();
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resolve({stdout, stderr, code, signal, output });
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});
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proc.on('error', err => {
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exit_cleanup();
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reject({ error: err, stdout, stderr, output });
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});
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});
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}
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async execute() {
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if (this.state !== job_states.PRIMED) {
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throw new Error(
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'Job must be in primed state, current state: ' +
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this.state.toString()
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);
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}
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logger.info(
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`Executing job uuid=${this.uuid} uid=${this.uid} gid=${
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this.gid
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} runtime=${this.runtime.toString()}`
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);
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logger.debug('Compiling');
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let compile;
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if (this.runtime.compiled) {
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compile = await this.safe_call(
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path.join(this.runtime.pkgdir, 'compile'),
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this.files.map(x => x.name),
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this.timeouts.compile,
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this.memory_limits.compile
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);
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}
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logger.debug('Running');
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const run = await this.safe_call(
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path.join(this.runtime.pkgdir, 'run'),
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[this.files[0].name, ...this.args],
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this.timeouts.run,
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this.memory_limits.run
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);
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this.state = job_states.EXECUTED;
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return {
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compile,
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run,
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language: this.runtime.language,
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version: this.runtime.version.raw,
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};
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}
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async cleanup_processes() {
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let processes = [1];
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while (processes.length > 0) {
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processes = await new Promise((resolve, reject) =>
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cp.execFile('ps', ['awwxo', 'pid,ruid'], (err, stdout) => {
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if (err === null) {
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const lines = stdout.split('\n').slice(1); //Remove header with slice
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const procs = lines.map(line => {
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const [pid, ruid] = line
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.trim()
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.split(/\s+/)
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.map(n => parseInt(n));
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return { pid, ruid };
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});
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resolve(procs);
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} else {
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reject(error);
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}
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})
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);
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processes = processes.filter(proc => proc.ruid === this.uid);
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for (const proc of processes) {
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// First stop the processes, but keep their resources allocated so they cant re-fork
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try {
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process.kill(proc.pid, 'SIGSTOP');
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} catch {
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// Could already be dead
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}
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}
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for (const proc of processes) {
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// Then clear them out of the process tree
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try {
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process.kill(proc.pid, 'SIGKILL');
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} catch {
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// Could already be dead and just needs to be waited on
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}
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wait_pid(proc.pid);
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}
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}
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}
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async cleanup_filesystem() {
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for (const clean_path of globals.clean_directories) {
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const contents = await fs.readdir(clean_path);
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for (const file of contents) {
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const file_path = path.join(clean_path, file);
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try {
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const stat = await fs.stat(file_path);
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if (stat.uid === this.uid) {
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await fs.rm(file_path, {
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recursive: true,
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force: true,
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});
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}
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} catch (e) {
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// File was somehow deleted in the time that we read the dir to when we checked the file
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logger.warn(`Error removing file ${file_path}: ${e}`);
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}
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}
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}
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await fs.rm(this.dir, { recursive: true, force: true });
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}
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async cleanup() {
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logger.info(`Cleaning up job uuid=${this.uuid}`);
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await this.cleanup_processes();
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await this.cleanup_filesystem();
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}
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}
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module.exports = {
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Job,
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};
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