etcher-sdk
Version:
60 lines • 2.6 kB
JavaScript
"use strict";
/*
* Copyright 2018 balena.io
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.StreamLimiter = void 0;
const stream_1 = require("stream");
const zlib = require("zlib");
const compressed_source_1 = require("./source-destination/compressed-source");
class StreamLimiter extends stream_1.Transform {
constructor(stream, maxBytes) {
super();
this.stream = stream;
this.maxBytes = maxBytes;
this.stream.on('error', this.emit.bind(this, 'error'));
this.stream.pipe(this);
}
_transform(buffer, _encoding, callback) {
var _a, _b, _c, _d, _e, _f;
const length = Math.min(buffer.length, this.maxBytes);
if (length > 0) {
this.push(buffer.slice(0, length));
}
this.maxBytes -= length;
if (this.maxBytes === 0) {
(_b = (_a = this.stream).unpipe) === null || _b === void 0 ? void 0 : _b.call(_a, this);
this.push(null);
this.emit('finish');
// Emit an 'end' event on the root stream because we want to stop reporting progress events on it.
(0, compressed_source_1.getRootStream)(this.stream).emit('end');
// TODO: maybe we don't need to try to close / destroy the stream ?
// We could let it be destroyed later when there is no more references to it.
// avoid https://github.com/nodejs/node/issues/15625
// @ts-expect-error zlib.Gunzip exists
if (!(this.stream instanceof zlib.Gunzip)) {
//eslint-disable-line
(_d = (_c = this.stream).close) === null || _d === void 0 ? void 0 : _d.call(_c);
}
// avoid `stream.push() after EOF`
if (this.stream.constructor.name !== 'JSLzmaStream') {
(_f = (_e = this.stream).destroy) === null || _f === void 0 ? void 0 : _f.call(_e);
}
}
callback();
}
}
exports.StreamLimiter = StreamLimiter;
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