複数のテキストファイルを結合し、zip アーカイバーを使用して単一の zip ファイルに変換しようとしています。
exports.downloadFilesInZip = function(req, res, next) {
var respObj = {};
var file_names = [];
var projectId = 111;
var file_ids = 11111;
console.log(projectId);
db.getConnection(function (err, connection) {
if (err) {
debug(err);
next(err);
}
else {
var updateQuery = "select data from file_data where file_id IN (?)";
console.log(updateQuery);
connection.query(updateQuery,[file_ids], function (err, results) {
console.log("inside" + updateQuery);
if (err) {
connection.release();
console.log("error" + JSON.stringify(err));
debug(err);
next(err);
}
else {
async.eachSeries(results,function(item,loopCallBack){
var text = "";
console.log("hllllllll");
console.log(item.data);
console.log(JSON.parse(item.data));
document_text = JSON.parse(item.data);
console.log("dssddssdsdsdsdsd"+document_text);
for(var j=0; j < document_text.length ;j++)
{
text += document_text[j]['text'];
}
//file_names.push(convertStringToTextFile(text));
convertStringToTextFile(text,function(err,file_name){
if(err){
console.log(err);
loopCallBack(err);
}
else {
file_names.push(file_name);
loopCallBack();
}
})
},function(err){
if(err){
console.log(err);
next(err);
}
else {
var updateQuery = "select name from project where id in (?)";
console.log(updateQuery);
connection.query(updateQuery,[projectId], function (err, results) {
console.log("inside" + updateQuery);
connection.release();
if (err) {
console.log("error" + JSON.stringify(err));
debug(err);
next(err);
}
else {
var fileName_link = JSON.stringify(results[0].name);
console.log("projectname"+fileName_link);
convertTextFilesToZip(file_names,fileName_link, function (err, filename) {
if (err) {
console.log(err);
next(err);
}
else {
console.log("filename link" + filename);
res.json({
status: 0,
file_link: filename
});
}
});
}
});
}
});
}
});
}
});
}
}
convertStringToTextFile = function(text,cb){
var json_filename = 'tmp/file_'+uuid.v4().replace('-','')+'.txt';
fs.writeFile(json_filename, text , function (err) {
if (err) {
debug(err);
cb(err);
}
else{
cb(null,json_filename);
}
});
};
convertTextFilesToZip = function(textFiles,file_link,cb){
console.log("textfiles"+textFiles);
var filename = 'reports/'+JSON.parse(file_link)+'_extractedText.zip';
var output = fs.createWriteStream(filename);
output.on('close', function() {
console.log(zipArchive.pointer() + ' total bytes');
console.log('archiver has been finalized and the output file descriptor has closed.');
});
zipArchive.on('error', function(err) {
cb(err);
});
zipArchive.pipe(output);
zipArchive.bulk([
{ expand: true, src: textFiles }
]);
zipArchive.finalize();
cb(null,filename);
}
初めて問題なく動作し、その後このエラーがスローされます.resが2回返される他の投稿を確認しましたが、見つかりませんでした.送信後にヘッダーを設定できないと書かれています.問題だと思います. convertTextFilesToZip 関数にありますが、エラーを生成している正確な場所を特定できないようです。
Error: Can't set headers after they are sent.
at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:350:11)
at ServerResponse.header (/Users/zeeshandar/Desktop/Agreements_info/agreements_info/node_modules/express/lib/response.js:700:10)
at ServerResponse.send (/Users/zeeshandar/Desktop/Agreements_info/agreements_info/node_modules/express/lib/response.js:154:12)
at fn (/Users/zeeshandar/Desktop/Agreements_info/agreements_info/node_modules/express/lib/response.js:934:10)
at View.exports.renderFile [as engine] (/Users/zeeshandar/Desktop/Agreements_info/agreements_info/node_modules/jade/lib/index.js:374:12)
at View.render (/Users/zeeshandar/Desktop/Agreements_info/agreements_info/node_modules/express/lib/view.js:93:8)
at EventEmitter.app.render (/Users/zeeshandar/Desktop/Agreements_info/agreements_info/node_modules/express/lib/application.js:566:10)
at ServerResponse.res.render (/Users/zeeshandar/Desktop/Agreements_info/agreements_info/node_modules/express/lib/response.js:938:7)
at /Users/zeeshandar/Desktop/Agreements_info/agreements_info/app.js:207:13
at Layer.handle_error (/Users/zeeshandar/Desktop/Agreements_info/agreements_info/node_modules/express/li b/router/layer.js:58:5)