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Viewing file:     progress.js (2.27 KB)      -rw-r--r--

'use strict';
const {Transform} = require('stream');

module.exports = {
	download(response, emitter, downloadBodySize) {
		let downloaded = 0;

		return new Transform({
			transform(chunk, encoding, callback) {
				downloaded += chunk.length;

				const percent = downloadBodySize ? downloaded / downloadBodySize : 0;

				// Let `flush()` be responsible for emitting the last event
				if (percent < 1) {
					emitter.emit('downloadProgress', {
						percent,
						transferred: downloaded,
						total: downloadBodySize
					});
				}

				callback(null, chunk);
			},

			flush(callback) {
				emitter.emit('downloadProgress', {
					percent: 1,
					transferred: downloaded,
					total: downloadBodySize
				});

				callback();
			}
		});
	},

	upload(request, emitter, uploadBodySize) {
		const uploadEventFrequency = 150;
		let uploaded = 0;
		let progressInterval;

		emitter.emit('uploadProgress', {
			percent: 0,
			transferred: 0,
			total: uploadBodySize
		});

		request.once('error', () => {
			clearInterval(progressInterval);
		});

		request.once('response', () => {
			clearInterval(progressInterval);

			emitter.emit('uploadProgress', {
				percent: 1,
				transferred: uploaded,
				total: uploadBodySize
			});
		});

		request.once('socket', socket => {
			const onSocketConnect = () => {
				progressInterval = setInterval(() => {
					const lastUploaded = uploaded;
					/* istanbul ignore next: see #490 (occurs randomly!) */
					const headersSize = request._header ? Buffer.byteLength(request._header) : 0;
					uploaded = socket.bytesWritten - headersSize;

					// Don't emit events with unchanged progress and
					// prevent last event from being emitted, because
					// it's emitted when `response` is emitted
					if (uploaded === lastUploaded || uploaded === uploadBodySize) {
						return;
					}

					emitter.emit('uploadProgress', {
						percent: uploadBodySize ? uploaded / uploadBodySize : 0,
						transferred: uploaded,
						total: uploadBodySize
					});
				}, uploadEventFrequency);
			};

			/* istanbul ignore next: hard to test */
			if (socket.connecting) {
				socket.once('connect', onSocketConnect);
			} else if (socket.writable) {
				// The socket is being reused from pool,
				// so the connect event will not be emitted
				onSocketConnect();
			}
		});
	}
};