78 lines
1.5 KiB
JavaScript
78 lines
1.5 KiB
JavaScript
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'use strict';
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// We define these manually to ensure they're always copied
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// even if they would move up the prototype chain
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// https://nodejs.org/api/http.html#http_class_http_incomingmessage
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const knownProperties = [
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'aborted',
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'complete',
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'headers',
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'httpVersion',
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'httpVersionMinor',
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'httpVersionMajor',
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'method',
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'rawHeaders',
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'rawTrailers',
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'setTimeout',
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'socket',
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'statusCode',
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'statusMessage',
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'trailers',
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'url'
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];
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module.exports = (fromStream, toStream) => {
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if (toStream._readableState.autoDestroy) {
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throw new Error('The second stream must have the `autoDestroy` option set to `false`');
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}
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const fromProperties = new Set(Object.keys(fromStream).concat(knownProperties));
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const properties = {};
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for (const property of fromProperties) {
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// Don't overwrite existing properties.
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if (property in toStream) {
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continue;
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}
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properties[property] = {
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get() {
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const value = fromStream[property];
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const isFunction = typeof value === 'function';
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return isFunction ? value.bind(fromStream) : value;
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},
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set(value) {
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fromStream[property] = value;
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},
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enumerable: true,
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configurable: false
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};
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}
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Object.defineProperties(toStream, properties);
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fromStream.once('aborted', () => {
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toStream.destroy();
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toStream.emit('aborted');
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});
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fromStream.once('close', () => {
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if (fromStream.complete) {
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if (toStream.readable) {
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toStream.once('end', () => {
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toStream.emit('close');
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});
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} else {
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toStream.emit('close');
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}
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} else {
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toStream.emit('close');
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}
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});
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return toStream;
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};
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