Я пытаюсь прочитать электронную таблицу, загруженную в Google Storage из приложения Nodejs, работающего в App Engine.
Функцией, предлагаемой @ google-cloud / storage package в Nodejs, является createReadStream ().Я передаю этот поток объекту Exceljs.
Код выглядит следующим образом:
const blob = bucket.file(req.file.originalname);
const blobStream = blob.createWriteStream();
blobStream.on('finish', () => {
let readStream = storage.bucket(bucket.name).file(blob.name).createReadStream();
let returnString = '';
const workbook = new Excel.stream.xlsx.WorkbookReader();
var options = {
entries: "emit",
sharedStrings: "cache",
worksheets: "emit"
};
workbook.read(readStream, options);
workbook.on('worksheet', function (worksheet) {
console.log("worksheet", worksheet.name);
worksheet.on('row', function (row) {
if(row.values.length > 0){
console.log(" row.values", row.values[1]);
returnString += row.values[1] + " ";
}
});
worksheet.on('close', function () {
console.log("worksheet close");
});
worksheet.on('finished', function () {
console.log("worksheet finished");
res.send(returnString);
});
});
});
blobStream.end(req.file.buffer);
Получает ли workbook.read (readStream, options) правильный readStream?
Поскольку я получаю следующую ошибку, упоминающую это:
UnhandledPromiseRejectionWarning: Error: Could not recognise input
2019-07-07 20:35:09 default[20190708t020308] at module.exports._getStream (/srv/node_modules/exceljs/dist/es5/stream/xlsx/workbook-reader.js:58:11)
2019-07-07 20:35:09 default[20190708t020308] at module.exports.read (/srv/node_modules/exceljs/dist/es5/stream/xlsx/workbook-reader.js:79:37)
2019-07-07 20:35:09 default[20190708t020308] at Pumpify.blobStream.on (/srv/app.js:80:14)
2019-07-07 20:35:09 default[20190708t020308] at Pumpify.emit (events.js:198:13)
2019-07-07 20:35:09 default[20190708t020308] at finishMaybe (/srv/node_modules/readable-stream/lib/_stream_writable.js:630:14)
2019-07-07 20:35:09 default[20190708t020308] at afterWrite (/srv/node_modules/readable-stream/lib/_stream_writable.js:492:3)
2019-07-07 20:35:09 default[20190708t020308] at onwrite (/srv/node_modules/readable-stream/lib/_stream_writable.js:483:7)
2019-07-07 20:35:09 default[20190708t020308] at Pumpify.WritableState.onwrite (/srv/node_modules/readable-stream/lib/_stream_writable.js:180:5)
2019-07-07 20:35:09 default[20190708t020308] at Object.onceWrapper (events.js:286:20)
2019-07-07 20:35:09 default[20190708t020308] at Pumpify.emit (events.js:198:13)
2019-07-07 20:35:09 default[20190708t020308] at Pumpify.Duplexify.uncork (/srv/node_modules/duplexify/index.js:77:50)