const {
Worker, isMainThread, parentPort, workerData
} = require('worker_threads');
// this is in the main thread
if (isMainThread) {
const transform = async (data, options) => {
options = options || {}
if (!options.hasOwnProperty('output')) {
options.output = 'binary'
}
if (!options.hasOwnProperty('nodeExcel')) {
options.nodeExcel = undefined
}
const workerResult = await new Promise((resolve, reject) => {
const worker = new Worker(__filename, {
workerData: {
data: data,
options: options,
}
});
worker.on('message', resolve);
worker.on('error', reject);
worker.on('exit', (code) => {
if (code !== 0) {
reject(new Error(`Worker stopped with exit code ${code}`));
}
worker.terminate()
});
});
return workerResult
};
transform.middleware = function(req, res, next) {
res.xls = async (filename, data, config) => {
const xls = await transform(data, config);
res.setHeader('Content-Type', 'application/vnd.openxmlformats');
res.setHeader("Content-Disposition", "attachment; filename=" + filename);
res.end(xls, 'binary');
};
next();
};
module.exports = transform
} else {
if (typeof workerData.options.output !== 'string' && workerData.options.output !== 'binary' && workerData.options.output !== 'base64') {
throw new Error(`The p3x-json2xls-worker-thread output can be 'binary' or 'base64', you requested ${workerData.options.output}, which is wrong.`)
}
const json2xls = require('./util');
const xls = json2xls(workerData.data, workerData.options.nodeExcel);
if (workerData.options.output === 'base64') {
const xlsBase64 = Buffer.from(xls, 'binary').toString('base64');
parentPort.postMessage(xlsBase64)
} else {
parentPort.postMessage(xls)
}
}
