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'use strict';
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const {Transform} = require('stream');
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module.exports = {
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download(response, emitter, downloadBodySize) {
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let downloaded = 0;
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return new Transform({
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transform(chunk, encoding, callback) {
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downloaded += chunk.length;
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const percent = downloadBodySize ? downloaded / downloadBodySize : 0;
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// Let `flush()` be responsible for emitting the last event
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if (percent < 1) {
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emitter.emit('downloadProgress', {
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percent,
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transferred: downloaded,
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total: downloadBodySize
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});
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}
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callback(null, chunk);
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},
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flush(callback) {
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emitter.emit('downloadProgress', {
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percent: 1,
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transferred: downloaded,
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total: downloadBodySize
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});
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callback();
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}
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});
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},
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upload(request, emitter, uploadBodySize) {
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const uploadEventFrequency = 150;
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let uploaded = 0;
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let progressInterval;
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emitter.emit('uploadProgress', {
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percent: 0,
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transferred: 0,
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total: uploadBodySize
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});
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request.once('error', () => {
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clearInterval(progressInterval);
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});
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request.once('response', () => {
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clearInterval(progressInterval);
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emitter.emit('uploadProgress', {
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percent: 1,
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transferred: uploaded,
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total: uploadBodySize
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});
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});
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request.once('socket', socket => {
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const onSocketConnect = () => {
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progressInterval = setInterval(() => {
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const lastUploaded = uploaded;
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/* istanbul ignore next: see #490 (occurs randomly!) */
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const headersSize = request._header ? Buffer.byteLength(request._header) : 0;
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uploaded = socket.bytesWritten - headersSize;
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// Don't emit events with unchanged progress and
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// prevent last event from being emitted, because
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// it's emitted when `response` is emitted
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if (uploaded === lastUploaded || uploaded === uploadBodySize) {
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return;
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}
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emitter.emit('uploadProgress', {
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percent: uploadBodySize ? uploaded / uploadBodySize : 0,
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transferred: uploaded,
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total: uploadBodySize
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});
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}, uploadEventFrequency);
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};
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/* istanbul ignore next: hard to test */
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if (socket.connecting) {
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socket.once('connect', onSocketConnect);
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} else if (socket.writable) {
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// The socket is being reused from pool,
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// so the connect event will not be emitted
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onSocketConnect();
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}
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});
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}
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};
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