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我從Busboy獲取文件流,然後將其管道傳輸到自定義轉換流以驗證並清除它。它適用於小文件,但隨着它們變大,我的自定義流不會等待busboy流完成並被截斷。節點轉換流不等待
這裏是打雜代碼:
busboy
.on("file", function(fieldname, file, filename, encoding, mimetype) {
//Creating a mongo doc first
Dataset.create(dataset, function (err, ds) {
if(err) {...}
else {
file.pipe(validateCSV));
}
});
validateCSV
.on("finish", function() {
// Send to Data Import
datasetService.import(validateCSV, dataset, function (err, result) {
...
});
});
});
我的變換流:
module.exports.ValidateCSV = ValidateCSV;
function ValidateCSV(options) {
if (!(this instanceof ValidateCSV)) return new ValidateCSV(options);
if (!options) options = {};
options.objectMode = true;
Transform.call(this, options);
}
util.inherits(ValidateCSV, Transform);
ValidateCSV.prototype._transform = function (chunk, encoding, done) {
if (this._checked) {
this.push(chunk);
} else {
//Do some validation
var data = chunk.toString();
var lines = data.match(/[^\r\n]+/g);
var headerline = lines[0] || "";
var header = headerline.split(",");
...
this._checked = true;
this.push(chunk);
}
done()
}