94 lines
2.3 KiB
TypeScript
94 lines
2.3 KiB
TypeScript
import { ChildProcessWithoutNullStreams, spawn } from 'child_process';
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import { BaseError } from 'noicejs';
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import { Writable } from 'stream';
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import { encode } from './Buffer';
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import { ChildProcessError } from './error/ChildProcessError';
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import { NameValuePair } from './Map';
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import { doesExist, Optional } from './Maybe';
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export interface ChildProcessOptions {
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cwd: string;
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env: Array<NameValuePair<string>>;
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timeout: number;
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}
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export interface ChildOptions extends ChildProcessOptions {
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args: Array<string>;
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command: string;
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}
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export interface ChildResult {
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status: number;
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stderr: string;
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stdout: string;
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}
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export type ChildStreams = ChildProcessWithoutNullStreams;
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export type ChildSpawner = typeof spawn;
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const CHILD_ENCODING = 'utf-8';
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const CHILD_EVENT = 'child process emitted error event';
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const CHILD_STATUS = 'child process exited with error status';
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const CHILD_OUTPUT = 'child process emitted error output';
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/**
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* Wait for a child process to exit, collecting output, errors, and exit status.
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*
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* @public
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*/
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export function waitForChild(child: ChildStreams): Promise<ChildResult> {
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return new Promise((res, rej) => {
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const stderr: Array<Buffer> = [];
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const stdout: Array<Buffer> = [];
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child.stderr.on('data', (chunk) => {
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stderr.push(chunk);
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});
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child.stdout.on('data', (chunk) => {
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stdout.push(chunk);
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});
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child.on('error', (err: Error | number) => {
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if (err instanceof Error) {
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rej(new ChildProcessError(CHILD_EVENT, err));
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}
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});
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child.on('close', (status: number) => {
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const errors = encode(stderr, CHILD_ENCODING);
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if (status > 0) {
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const msg = `${CHILD_STATUS}: ${status}`;
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rej(new ChildProcessError(msg, new BaseError(errors)));
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return;
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}
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if (errors.length > 0) {
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rej(new ChildProcessError(CHILD_OUTPUT, new BaseError(errors)));
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return;
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}
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res({
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status,
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stderr: errors,
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stdout: encode(stdout, CHILD_ENCODING),
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});
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});
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});
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}
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export function writeValue(stream: Writable, value: string): Promise<boolean> {
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return new Promise<boolean>((res, rej) => {
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stream.write(value, (err: Optional<Error>) => {
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if (doesExist(err)) {
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rej(err);
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} else {
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stream.end(() => {
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res(true);
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});
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}
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});
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});
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}
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