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keksAccountGUI/node_modulesOLD/thread-loader/dist/worker.js

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2019-08-11 18:48:02 +00:00
'use strict';
var _fs = require('fs');
var _fs2 = _interopRequireDefault(_fs);
var _module = require('module');
var _module2 = _interopRequireDefault(_module);
var _loaderRunner = require('loader-runner');
var _loaderRunner2 = _interopRequireDefault(_loaderRunner);
var _queue = require('neo-async/queue');
var _queue2 = _interopRequireDefault(_queue);
var _readBuffer = require('./readBuffer');
var _readBuffer2 = _interopRequireDefault(_readBuffer);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
const writePipe = _fs2.default.createWriteStream(null, { fd: 3 }); /* global require */
/* eslint-disable no-console */
const readPipe = _fs2.default.createReadStream(null, { fd: 4 });
writePipe.on('finish', onTerminateWrite);
readPipe.on('end', onTerminateRead);
writePipe.on('close', onTerminateWrite);
readPipe.on('close', onTerminateRead);
readPipe.on('error', onError);
writePipe.on('error', onError);
const PARALLEL_JOBS = +process.argv[2];
let terminated = false;
let nextQuestionId = 0;
const callbackMap = Object.create(null);
function onError(error) {
console.error(error);
}
function onTerminateRead() {
terminateRead();
}
function onTerminateWrite() {
terminateWrite();
}
function writePipeWrite(...args) {
if (!terminated) {
writePipe.write(...args);
}
}
function writePipeCork() {
if (!terminated) {
writePipe.cork();
}
}
function writePipeUncork() {
if (!terminated) {
writePipe.uncork();
}
}
function terminateRead() {
terminated = true;
readPipe.removeAllListeners();
}
function terminateWrite() {
terminated = true;
writePipe.removeAllListeners();
}
function terminate() {
terminateRead();
terminateWrite();
}
function toErrorObj(err) {
return {
message: err.message,
details: err.details,
stack: err.stack,
hideStack: err.hideStack
};
}
function toNativeError(obj) {
if (!obj) return null;
const err = new Error(obj.message);
err.details = obj.details;
err.missing = obj.missing;
return err;
}
function writeJson(data) {
writePipeCork();
process.nextTick(() => {
writePipeUncork();
});
const lengthBuffer = Buffer.alloc(4);
const messageBuffer = Buffer.from(JSON.stringify(data), 'utf-8');
lengthBuffer.writeInt32BE(messageBuffer.length, 0);
writePipeWrite(lengthBuffer);
writePipeWrite(messageBuffer);
}
const queue = (0, _queue2.default)(({ id, data }, taskCallback) => {
try {
_loaderRunner2.default.runLoaders({
loaders: data.loaders,
resource: data.resource,
readResource: _fs2.default.readFile.bind(_fs2.default),
context: {
version: 2,
resolve: (context, request, callback) => {
callbackMap[nextQuestionId] = callback;
writeJson({
type: 'resolve',
id,
questionId: nextQuestionId,
context,
request
});
nextQuestionId += 1;
},
emitWarning: warning => {
writeJson({
type: 'emitWarning',
id,
data: toErrorObj(warning)
});
},
emitError: error => {
writeJson({
type: 'emitError',
id,
data: toErrorObj(error)
});
},
exec: (code, filename) => {
const module = new _module2.default(filename, undefined);
module.paths = _module2.default._nodeModulePaths(undefined.context); // eslint-disable-line no-underscore-dangle
module.filename = filename;
module._compile(code, filename); // eslint-disable-line no-underscore-dangle
return module.exports;
},
options: {
context: data.optionsContext
},
webpack: true,
'thread-loader': true,
sourceMap: data.sourceMap,
target: data.target,
minimize: data.minimize,
resourceQuery: data.resourceQuery
}
}, (err, lrResult) => {
const {
result,
cacheable,
fileDependencies,
contextDependencies
} = lrResult;
const buffersToSend = [];
const convertedResult = Array.isArray(result) && result.map(item => {
const isBuffer = Buffer.isBuffer(item);
if (isBuffer) {
buffersToSend.push(item);
return {
buffer: true
};
}
if (typeof item === 'string') {
const stringBuffer = Buffer.from(item, 'utf-8');
buffersToSend.push(stringBuffer);
return {
buffer: true,
string: true
};
}
return {
data: item
};
});
writeJson({
type: 'job',
id,
error: err && toErrorObj(err),
result: {
result: convertedResult,
cacheable,
fileDependencies,
contextDependencies
},
data: buffersToSend.map(buffer => buffer.length)
});
buffersToSend.forEach(buffer => {
writePipeWrite(buffer);
});
setImmediate(taskCallback);
});
} catch (e) {
writeJson({
type: 'job',
id,
error: toErrorObj(e)
});
taskCallback();
}
}, PARALLEL_JOBS);
function dispose() {
terminate();
queue.kill();
process.exit(0);
}
function onMessage(message) {
try {
const { type, id } = message;
switch (type) {
case 'job':
{
queue.push(message);
break;
}
case 'result':
{
const { error, result } = message;
const callback = callbackMap[id];
if (callback) {
const nativeError = toNativeError(error);
callback(nativeError, result);
} else {
console.error(`Worker got unexpected result id ${id}`);
}
delete callbackMap[id];
break;
}
case 'warmup':
{
const { requires } = message;
// load modules into process
requires.forEach(r => require(r)); // eslint-disable-line import/no-dynamic-require, global-require
break;
}
default:
{
console.error(`Worker got unexpected job type ${type}`);
break;
}
}
} catch (e) {
console.error(`Error in worker ${e}`);
}
}
function readNextMessage() {
(0, _readBuffer2.default)(readPipe, 4, (lengthReadError, lengthBuffer) => {
if (lengthReadError) {
console.error(`Failed to communicate with main process (read length) ${lengthReadError}`);
return;
}
const length = lengthBuffer.length && lengthBuffer.readInt32BE(0);
if (length === 0) {
// worker should dispose and exit
dispose();
return;
}
(0, _readBuffer2.default)(readPipe, length, (messageError, messageBuffer) => {
if (terminated) {
return;
}
if (messageError) {
console.error(`Failed to communicate with main process (read message) ${messageError}`);
return;
}
const messageString = messageBuffer.toString('utf-8');
const message = JSON.parse(messageString);
onMessage(message);
setImmediate(() => readNextMessage());
});
});
}
// start reading messages from main process
readNextMessage();