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'use strict';
const {constants: BufferConstants} = require('buffer');
const stream = require('stream');
const {promisify} = require('util');
const bufferStream = require('./buffer-stream');
const streamPipelinePromisified = promisify(stream.pipeline);
class MaxBufferError extends Error {
constructor() {
super('maxBuffer exceeded');
this.name = 'MaxBufferError';
}
}
async function getStream(inputStream, options) {
if (!inputStream) {
throw new Error('Expected a stream');
}
options = {
maxBuffer: Infinity,
...options
};
const {maxBuffer} = options;
const stream = bufferStream(options);
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);
};
(async () => {
try {
await streamPipelinePromisified(inputStream, stream);
resolve();
} catch (error) {
rejectPromise(error);
}
})();
stream.on('data', () => {
if (stream.getBufferedLength() > maxBuffer) {
rejectPromise(new MaxBufferError());
}
});
});
return stream.getBufferedValue();
}
module.exports = 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;
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