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'use strict';
const {constants: BufferConstants} = require('buffer');
const pump = require('pump');
const bufferStream = require('./buffer-stream');

class MaxBufferError extends Error {
	constructor() {
		super('maxBuffer exceeded');
		this.name = 'MaxBufferError';
	}
}

async function getStream(inputStream, options) {
	if (!inputStream) {
		return Promise.reject(new Error('Expected a stream'));
	}

	options = {
		maxBuffer: Infinity,
		...options
	};

	const {maxBuffer} = options;

	let stream;
	await new Promise((resolve, reject) => {
		const rejectPromise = error => {
			// Don't retrieve an oversized buffer.
			if (error && stream.getBufferedLength() <= BufferConstants.MAX_LENGTH) {
				error.bufferedData = stream.getBufferedValue();
			}

			reject(error);
		};

		stream = pump(inputStream, bufferStream(options), error => {
			if (error) {
				rejectPromise(error);
				return;
			}

			resolve();
		});

		stream.on('data', () => {
			if (stream.getBufferedLength() > maxBuffer) {
				rejectPromise(new MaxBufferError());
			}
		});
	});

	return stream.getBufferedValue();
}

module.exports = getStream;
// TODO: Remove this for the next major release
module.exports.default = getStream;
module.exports.buffer = (stream, options) => getStream(stream, {...options, encoding: 'buffer'});
module.exports.array = (stream, options) => getStream(stream, {...options, array: true});
module.exports.MaxBufferError = MaxBufferError;