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child.js
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child.js
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/* @flow */
/* global child_process$spawnOpts */
import * as constants from '../constants.js';
import BlockingQueue from './blocking-queue.js';
import {ProcessSpawnError, ProcessTermError} from '../errors.js';
import {promisify} from './promise.js';
const os = require('os');
const child = require('child_process');
const fs = require('fs');
const path = require('path');
export const queue = new BlockingQueue('child', constants.CHILD_CONCURRENCY);
// TODO: this uid check is kinda whack
let uid = 0;
export const exec = promisify(child.exec);
function validate(program: string, opts?: Object = {}) {
if (program.match(/[\\\/]/)) {
return;
}
if (process.platform === 'win32' && process.env.PATHEXT) {
const cwd = opts.cwd || process.cwd();
const pathext = process.env.PATHEXT;
for (const ext of pathext.split(';')) {
const candidate = path.join(cwd, `${program}${ext}`);
if (fs.existsSync(candidate)) {
throw new Error(`Potentially dangerous call to "${program}" in ${cwd}`);
}
}
}
}
export function forkp(program: string, args: Array<string>, opts?: Object): Promise<number> {
validate(program, opts);
const key = String(++uid);
return new Promise((resolve, reject) => {
const proc = child.fork(program, args, opts);
spawnedProcesses[key] = proc;
proc.on('error', error => {
reject(error);
});
proc.on('close', (exitCode: number, signal: string) => {
const finalExitCode =
typeof exitCode !== `undefined` && exitCode !== null ? exitCode : 128 + os.constants.signals[signal];
resolve(finalExitCode);
});
});
}
export function spawnp(program: string, args: Array<string>, opts?: Object): Promise<number> {
validate(program, opts);
const key = String(++uid);
return new Promise((resolve, reject) => {
const proc = child.spawn(program, args, opts);
spawnedProcesses[key] = proc;
proc.on('error', error => {
reject(error);
});
proc.on('close', (exitCode: number, signal: string) => {
const finalExitCode =
typeof exitCode !== `undefined` && exitCode !== null ? exitCode : 128 + os.constants.signals[signal];
resolve(finalExitCode);
});
});
}
const spawnedProcesses = {};
export function forwardSignalToSpawnedProcesses(signal: string) {
for (const key of Object.keys(spawnedProcesses)) {
spawnedProcesses[key].kill(signal);
}
}
type ProcessFn = (
proc: child_process$ChildProcess,
update: (chunk: string) => void,
reject: (err: mixed) => void,
done: () => void,
) => void;
export function spawn(
program: string,
args: Array<string>,
opts?: child_process$spawnOpts & {detached?: boolean, process?: ProcessFn} = {},
onData?: (chunk: Buffer | string) => void,
): Promise<string> {
const key = opts.cwd || String(++uid);
return queue.push(
key,
(): Promise<string> =>
new Promise((resolve, reject) => {
validate(program, opts);
const proc = child.spawn(program, args, opts);
spawnedProcesses[key] = proc;
let processingDone = false;
let processClosed = false;
let err = null;
let stdout = '';
proc.on('error', err => {
if (err.code === 'ENOENT') {
reject(new ProcessSpawnError(`Couldn't find the binary ${program}`, err.code, program));
} else {
reject(err);
}
});
function updateStdout(chunk: string) {
stdout += chunk;
if (onData) {
onData(chunk);
}
}
function finish() {
delete spawnedProcesses[key];
if (err) {
reject(err);
} else {
resolve(stdout.trim());
}
}
if (typeof opts.process === 'function') {
opts.process(proc, updateStdout, reject, function() {
if (processClosed) {
finish();
} else {
processingDone = true;
}
});
} else {
if (proc.stderr) {
proc.stderr.on('data', updateStdout);
}
if (proc.stdout) {
proc.stdout.on('data', updateStdout);
}
processingDone = true;
}
proc.on('close', (code: number, signal: string) => {
if (signal || code >= 1) {
err = new ProcessTermError(
[
'Command failed.',
signal ? `Exit signal: ${signal}` : `Exit code: ${code}`,
`Command: ${program}`,
`Arguments: ${args.join(' ')}`,
`Directory: ${opts.cwd || process.cwd()}`,
`Output:\n${stdout.trim()}`,
].join('\n'),
);
err.EXIT_SIGNAL = signal;
err.EXIT_CODE = code;
}
if (processingDone || err) {
finish();
} else {
processClosed = true;
}
});
}),
);
}