'use strict';
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const isStream = require('is-stream');
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const getStream = require('get-stream');
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const mergeStream = require('merge-stream');
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// `input` option
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const handleInput = (spawned, input) => {
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// Checking for stdin is workaround for https://github.com/nodejs/node/issues/26852
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// @todo remove `|| spawned.stdin === undefined` once we drop support for Node.js <=12.2.0
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if (input === undefined || spawned.stdin === undefined) {
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return;
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}
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if (isStream(input)) {
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input.pipe(spawned.stdin);
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} else {
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spawned.stdin.end(input);
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}
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};
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// `all` interleaves `stdout` and `stderr`
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const makeAllStream = (spawned, {all}) => {
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if (!all || (!spawned.stdout && !spawned.stderr)) {
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return;
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}
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const mixed = mergeStream();
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if (spawned.stdout) {
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mixed.add(spawned.stdout);
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}
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if (spawned.stderr) {
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mixed.add(spawned.stderr);
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}
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return mixed;
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};
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// On failure, `result.stdout|stderr|all` should contain the currently buffered stream
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const getBufferedData = async (stream, streamPromise) => {
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if (!stream) {
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return;
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}
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stream.destroy();
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try {
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return await streamPromise;
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} catch (error) {
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return error.bufferedData;
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}
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};
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const getStreamPromise = (stream, {encoding, buffer, maxBuffer}) => {
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if (!stream || !buffer) {
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return;
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}
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if (encoding) {
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return getStream(stream, {encoding, maxBuffer});
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}
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return getStream.buffer(stream, {maxBuffer});
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};
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// Retrieve result of child process: exit code, signal, error, streams (stdout/stderr/all)
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const getSpawnedResult = async ({stdout, stderr, all}, {encoding, buffer, maxBuffer}, processDone) => {
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const stdoutPromise = getStreamPromise(stdout, {encoding, buffer, maxBuffer});
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const stderrPromise = getStreamPromise(stderr, {encoding, buffer, maxBuffer});
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const allPromise = getStreamPromise(all, {encoding, buffer, maxBuffer: maxBuffer * 2});
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try {
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return await Promise.all([processDone, stdoutPromise, stderrPromise, allPromise]);
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} catch (error) {
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return Promise.all([
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{error, signal: error.signal, timedOut: error.timedOut},
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getBufferedData(stdout, stdoutPromise),
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getBufferedData(stderr, stderrPromise),
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getBufferedData(all, allPromise)
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]);
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}
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};
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const validateInputSync = ({input}) => {
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if (isStream(input)) {
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throw new TypeError('The `input` option cannot be a stream in sync mode');
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}
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};
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module.exports = {
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handleInput,
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makeAllStream,
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getSpawnedResult,
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validateInputSync
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};
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