hackpro-sdk
Version:
154 lines • 6.85 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.
*/
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
const bluebird_1 = require("bluebird");
const _debug = require("debug");
const readable_stream_1 = require("readable-stream");
const constants_1 = require("./constants");
const errors_1 = require("./errors");
const progress_1 = require("./source-destination/progress");
const utils_1 = require("./utils");
const debug = _debug('etcher:writer:block-write-stream');
class BlockWriteStream extends readable_stream_1.Writable {
constructor(destination, firstBytesToKeep = 0, maxRetries = 5) {
super({ objectMode: true, highWaterMark: 1 });
this.destination = destination;
this.firstBytesToKeep = firstBytesToKeep;
this.maxRetries = maxRetries;
this.bytesWritten = 0;
this._firstBuffers = [];
this._buffers = [];
this._bytes = 0;
this.firstBytesToKeep =
Math.ceil(firstBytesToKeep / destination.blockSize) *
destination.blockSize;
}
writeChunk(buffer, position, flushing = false) {
return __awaiter(this, void 0, void 0, function* () {
let retries = 0;
while (true) {
try {
const { bytesWritten } = yield this.destination.write(buffer, 0, buffer.length, position);
if (!flushing) {
this.bytesWritten += bytesWritten;
}
return;
}
catch (error) {
if (errors_1.isTransientError(error)) {
if (retries < this.maxRetries) {
retries += 1;
yield bluebird_1.delay(constants_1.RETRY_BASE_TIMEOUT * retries);
continue;
}
error.code = 'EUNPLUGGED';
}
throw error;
}
}
});
}
writeBuffers() {
return __awaiter(this, void 0, void 0, function* () {
if (this._bytes >= constants_1.CHUNK_SIZE) {
let block = Buffer.concat(this._buffers);
const length = Math.floor(block.length / this.destination.blockSize) *
this.destination.blockSize;
this._buffers.length = 0;
this._bytes = 0;
if (block.length !== length) {
this._buffers.push(block.slice(length));
this._bytes += block.length - length;
block = block.slice(0, length);
}
yield this.writeChunk(block, this.bytesWritten);
}
});
}
__write(buffer) {
return __awaiter(this, void 0, void 0, function* () {
debug('_write', buffer.length, this.bytesWritten);
// Keep the first blocks in memory and write them once the rest has been written.
// This is to prevent Windows from mounting the device while we flash it.
if (this.bytesWritten < this.firstBytesToKeep) {
const end = this.bytesWritten + buffer.length;
if (end <= this.firstBytesToKeep) {
this._firstBuffers.push(buffer);
this.bytesWritten += buffer.length;
}
else {
const difference = this.firstBytesToKeep - this.bytesWritten;
this._firstBuffers.push(buffer.slice(0, difference));
this._buffers.push(buffer.slice(difference));
this._bytes += buffer.length - difference;
this.bytesWritten += difference;
yield this.writeBuffers();
}
}
else if (this._bytes === 0 &&
buffer.length >= constants_1.CHUNK_SIZE &&
buffer.length % this.destination.blockSize === 0) {
yield this.writeChunk(buffer, this.bytesWritten);
}
else {
this._buffers.push(buffer);
this._bytes += buffer.length;
yield this.writeBuffers();
}
});
}
_write(buffer, _encoding, callback) {
utils_1.asCallback(this.__write(buffer), callback);
}
__final() {
return __awaiter(this, void 0, void 0, function* () {
debug('_final');
try {
if (this._bytes) {
yield this.writeChunk(Buffer.concat(this._buffers, this._bytes), this.bytesWritten);
}
let position = 0;
for (const buffer of this._firstBuffers) {
yield this.writeChunk(buffer, position, true);
position += buffer.length;
}
}
catch (error) {
this.destroy();
throw error;
}
});
}
/**
* @summary Write buffered data before a stream ends, called by stream internals
*/
_final(callback) {
utils_1.asCallback(this.__final(), callback);
}
}
exports.BlockWriteStream = BlockWriteStream;
exports.ProgressBlockWriteStream = progress_1.makeClassEmitProgressEvents(BlockWriteStream, 'bytesWritten', 'bytesWritten', constants_1.PROGRESS_EMISSION_INTERVAL);
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