495 lines
16 KiB
JavaScript
495 lines
16 KiB
JavaScript
const logplease = require('logplease');
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const logger = 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 fss = require('fs');
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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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let remaining_job_spaces = config.max_concurrent_jobs;
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let job_queue = [];
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class Job {
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#active_timeouts;
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#active_parent_processes;
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constructor({ runtime, files, args, stdin, timeouts, memory_limits }) {
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this.uuid = uuidv4();
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this.logger = logplease.create(`job/${this.uuid}`);
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this.runtime = runtime;
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this.files = files.map((file, i) => ({
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name: file.name || `file${i}.code`,
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content: file.content,
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encoding: ['base64', 'hex', 'utf8'].includes(file.encoding)
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? file.encoding
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: 'utf8',
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}));
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this.args = args;
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this.stdin = stdin;
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// Add a trailing newline if it doesn't exist
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if (this.stdin.slice(-1) !== '\n') {
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this.stdin += '\n';
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}
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this.#active_timeouts = [];
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this.#active_parent_processes = [];
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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.logger.debug(`Assigned uid=${this.uid} gid=${this.gid}`);
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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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if (remaining_job_spaces < 1) {
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this.logger.info(`Awaiting job slot`);
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await new Promise(resolve => {
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job_queue.push(resolve);
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});
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}
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this.logger.info(`Priming job`);
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remaining_job_spaces--;
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this.logger.debug('Writing files to job cache');
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this.logger.debug(`Transfering ownership`);
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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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const file_path = path.join(this.dir, file.name);
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const rel = path.relative(this.dir, file_path);
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const file_content = Buffer.from(file.content, file.encoding);
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if (rel.startsWith('..'))
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throw Error(
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`File path "${file.name}" tries to escape parent directory: ${rel}`
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);
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await fs.mkdir(path.dirname(file_path), {
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recursive: true,
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mode: 0o700,
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});
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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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this.logger.debug('Primed job');
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}
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exit_cleanup() {
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for (const timeout of this.#active_timeouts) {
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clear_timeout(timeout);
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}
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this.#active_timeouts = [];
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this.logger.debug('Cleared the active timeouts');
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this.cleanup_processes();
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this.logger.debug(`Finished exit cleanup`);
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}
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close_cleanup() {
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for (const proc of this.#active_parent_processes) {
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proc.stderr.destroy();
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if (!proc.stdin.destroyed) {
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proc.stdin.end();
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proc.stdin.destroy();
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}
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proc.stdout.destroy();
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}
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this.#active_parent_processes = [];
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this.logger.debug('Destroyed processes writables');
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}
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async safe_call(file, args, timeout, memory_limit, event_bus = null) {
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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=' + this.runtime.max_process_count,
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'--nofile=' + this.runtime.max_open_files,
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'--fsize=' + this.runtime.max_file_size,
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];
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const timeout_call = [
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'timeout',
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'-s',
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'9',
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Math.ceil(timeout / 1000),
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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 = [
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'nice',
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...timeout_call,
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...prlimit,
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...nonetwork,
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'bash',
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file,
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...args,
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];
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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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this.#active_parent_processes.push(proc);
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if (event_bus === null) {
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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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} else {
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event_bus.on('stdin', data => {
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proc.stdin.write(data);
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});
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event_bus.on('kill', signal => {
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proc.kill(signal);
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});
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}
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const kill_timeout =
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(timeout >= 0 &&
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set_timeout(async _ => {
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this.logger.info(`Timeout exceeded timeout=${timeout}`);
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try {
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process.kill(proc.pid, 'SIGKILL');
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}
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catch (e) {
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// Could already be dead and just needs to be waited on
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this.logger.debug(
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`Got error while SIGKILLing process ${proc}:`,
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e
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);
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}
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}, timeout)) ||
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null;
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this.#active_timeouts.push(kill_timeout);
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proc.stderr.on('data', async data => {
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if (event_bus !== null) {
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event_bus.emit('stderr', data);
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} else if (stderr.length > this.runtime.output_max_size) {
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this.logger.info(`stderr length exceeded`);
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try {
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process.kill(proc.pid, 'SIGKILL');
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}
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catch (e) {
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// Could already be dead and just needs to be waited on
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this.logger.debug(
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`Got error while SIGKILLing process ${proc}:`,
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e
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);
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}
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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', async data => {
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if (event_bus !== null) {
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event_bus.emit('stdout', data);
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} else if (stdout.length > this.runtime.output_max_size) {
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this.logger.info(`stdout length exceeded`);
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try {
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process.kill(proc.pid, 'SIGKILL');
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}
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catch (e) {
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// Could already be dead and just needs to be waited on
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this.logger.debug(
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`Got error while SIGKILLing process ${proc}:`,
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e
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);
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}
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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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proc.on('exit', () => this.exit_cleanup());
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proc.on('close', (code, signal) => {
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this.close_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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this.exit_cleanup();
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this.close_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(event_bus = null) {
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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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this.logger.info(`Executing job runtime=${this.runtime.toString()}`);
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const code_files =
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(this.runtime.language === 'file' && this.files) ||
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this.files.filter(file => file.encoding == 'utf8');
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this.logger.debug('Compiling');
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let compile;
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let compile_errored = false;
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const { emit_event_bus_result, emit_event_bus_stage } =
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event_bus === null
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? {
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emit_event_bus_result: () => { },
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emit_event_bus_stage: () => { },
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}
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: {
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emit_event_bus_result: (stage, result, event_bus) => {
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const { error, code, signal } = result;
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event_bus.emit('exit', stage, {
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error,
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code,
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signal,
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});
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},
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emit_event_bus_stage: (stage, event_bus) => {
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event_bus.emit('stage', stage);
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},
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};
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if (this.runtime.compiled) {
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this.logger.debug('Compiling');
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emit_event_bus_stage('compile', event_bus);
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compile = await this.safe_call(
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path.join(this.runtime.pkgdir, 'compile'),
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code_files.map(x => x.name),
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this.timeouts.compile,
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this.memory_limits.compile,
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event_bus
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);
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emit_event_bus_result('compile', compile, event_bus);
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compile_errored = compile.code !== 0;
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}
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let run;
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if (!compile_errored) {
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this.logger.debug('Running');
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emit_event_bus_stage('run', event_bus);
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run = await this.safe_call(
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path.join(this.runtime.pkgdir, 'run'),
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[code_files[0].name, ...this.args],
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this.timeouts.run,
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this.memory_limits.run,
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event_bus
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);
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emit_event_bus_result('run', run, event_bus);
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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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cleanup_processes(dont_wait = []) {
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let processes = [1];
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const to_wait = [];
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this.logger.debug(`Cleaning up processes`);
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while (processes.length > 0) {
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processes = [];
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const proc_ids = fss.readdir_sync('/proc');
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processes = proc_ids.map(proc_id => {
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if (isNaN(proc_id)) return -1;
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try {
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const proc_status = fss.read_file_sync(
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path.join('/proc', proc_id, 'status')
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);
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const proc_lines = proc_status.to_string().split('\n');
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const state_line = proc_lines.find(line =>
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line.starts_with('State:')
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);
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const uid_line = proc_lines.find(line =>
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line.starts_with('Uid:')
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);
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const [_, ruid, euid, suid, fuid] = uid_line.split(/\s+/);
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const [_1, state, user_friendly] = state_line.split(/\s+/);
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const proc_id_int = parse_int(proc_id);
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// Skip over any processes that aren't ours.
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if (ruid != this.uid && euid != this.uid) return -1;
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if (state == 'Z') {
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// Zombie process, just needs to be waited, regardless of the user id
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if (!to_wait.includes(proc_id_int))
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to_wait.push(proc_id_int);
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return -1;
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}
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// We should kill in all other state (Sleep, Stopped & Running)
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return proc_id_int;
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} catch {
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return -1;
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}
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return -1;
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});
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processes = processes.filter(p => p > 0);
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if (processes.length > 0)
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this.logger.debug(`Got processes to kill: ${processes}`);
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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, 'SIGSTOP');
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} catch (e) {
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// Could already be dead
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this.logger.debug(
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`Got error while SIGSTOPping process ${proc}:`,
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e
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);
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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, 'SIGKILL');
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} catch (e) {
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// Could already be dead and just needs to be waited on
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this.logger.debug(
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`Got error while SIGKILLing process ${proc}:`,
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e
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);
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}
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to_wait.push(proc);
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}
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}
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this.logger.debug(
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`Finished kill-loop, calling wait_pid to end any zombie processes`
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);
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for (const proc of to_wait) {
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if (dont_wait.includes(proc)) continue;
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wait_pid(proc);
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}
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this.logger.debug(`Cleaned up processes`);
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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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this.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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this.logger.info(`Cleaning up job`);
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this.exit_cleanup(); // Run process janitor, just incase there are any residual processes somehow
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this.close_cleanup();
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await this.cleanup_filesystem();
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remaining_job_spaces++;
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if (job_queue.length > 0) {
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job_queue.shift()();
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}
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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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