1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586 |
- // Ported from https://github.com/mafintosh/pump with
- // permission from the author, Mathias Buus (@mafintosh).
- 'use strict';
- var eos;
- function once(callback) {
- var called = false;
- return function () {
- if (called) return;
- called = true;
- callback.apply(void 0, arguments);
- };
- }
- var _require$codes = require('../../../errors').codes,
- ERR_MISSING_ARGS = _require$codes.ERR_MISSING_ARGS,
- ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED;
- function noop(err) {
- // Rethrow the error if it exists to avoid swallowing it
- if (err) throw err;
- }
- function isRequest(stream) {
- return stream.setHeader && typeof stream.abort === 'function';
- }
- function destroyer(stream, reading, writing, callback) {
- callback = once(callback);
- var closed = false;
- stream.on('close', function () {
- closed = true;
- });
- if (eos === undefined) eos = require('./end-of-stream');
- eos(stream, {
- readable: reading,
- writable: writing
- }, function (err) {
- if (err) return callback(err);
- closed = true;
- callback();
- });
- var destroyed = false;
- return function (err) {
- if (closed) return;
- if (destroyed) return;
- destroyed = true;
- // request.destroy just do .end - .abort is what we want
- if (isRequest(stream)) return stream.abort();
- if (typeof stream.destroy === 'function') return stream.destroy();
- callback(err || new ERR_STREAM_DESTROYED('pipe'));
- };
- }
- function call(fn) {
- fn();
- }
- function pipe(from, to) {
- return from.pipe(to);
- }
- function popCallback(streams) {
- if (!streams.length) return noop;
- if (typeof streams[streams.length - 1] !== 'function') return noop;
- return streams.pop();
- }
- function pipeline() {
- for (var _len = arguments.length, streams = new Array(_len), _key = 0; _key < _len; _key++) {
- streams[_key] = arguments[_key];
- }
- var callback = popCallback(streams);
- if (Array.isArray(streams[0])) streams = streams[0];
- if (streams.length < 2) {
- throw new ERR_MISSING_ARGS('streams');
- }
- var error;
- var destroys = streams.map(function (stream, i) {
- var reading = i < streams.length - 1;
- var writing = i > 0;
- return destroyer(stream, reading, writing, function (err) {
- if (!error) error = err;
- if (err) destroys.forEach(call);
- if (reading) return;
- destroys.forEach(call);
- callback(error);
- });
- });
- return streams.reduce(pipe);
- }
- module.exports = pipeline;
|