I am new on nodejs
ı have a project for server sent events.
I am trying get datas with server sent events on console.
this is my code:
var source = new EventSource('https://sse.now.sh');
source.onmessage = function(e) {
console.log(e.data)
};
but when i try start project with node file.js :
ReferenceError: EventSource is not defined
at Object.<anonymous> (c:\Users\SYDNEY\Desktop\server-sent-events-demo\src\client\js\app.js:7:5)
at Module._compile (internal/modules/cjs/loader.js:953:14)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
at Module.load (internal/modules/cjs/loader.js:812:32)
at Function.Module._load (internal/modules/cjs/loader.js:724:14)
at Function.Module.runMain (internal/modules/cjs/loader.js:1025:10)
at internal/main/run_main_module.js:17:11
its just simple but i couldnt do anyting. should ı download anything about that ? bcz this script working on jsbin(website)
I solved this problem with add top of codes
var EventSource = require('eventsource')
var source = new EventSource('https://sse.now.sh');
source.onmessage = function(e) {
console.log(e.data)
};
Related
I'm planning to create simple users browser tracking system, where I want to track whether user is idle for certain time or not. I thought NodeJS would be the ideal choice.
Found certain NodeJS modules as well. But the problem is that all of them are using document. But in my case there is not document object is available, as I'm using pure NodeJS where there is no browser interaction is possible as I want to tack browser inactivity in background.
I tried below NPM Module.
https://www.npmjs.com/package/away
Which gives below error.
ReferenceError: document is not defined
at Object.<anonymous> (/media/d/Projects/PHPProjects/ets/node_modules/away/index.js:16:14)
at Module._compile (module.js:571:32)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.require (module.js:498:17)
at require (internal/module.js:20:19)
at Object.<anonymous> (/media/d/Projects/PHPProjects/ets/index.js:16:16)
at Module._compile (module.js:571:32)
Here is my implementation
// HTTP Module
var http = require('http');
// OS Utility Module
var os = require('os-utils');
// Native OS object
var osNative = require('os');
// MySQL Connection Setup
var mysql = require('mysql');
// Create server
var server = http.createServer(function() {});
var away = require('away');
// detect users who are idle for 10 seconds
var timer = away(5000);
timer.on('idle', function() {
console.log('user is idle');
});
timer.on('active', function() {
console.log('user is active');
});
Let's say I have this
userinfo={
userDetails:
{
username:"",
password:"",
cookie:"",
firstname:"",
lastname:"",
phonenumber:"",
postalcode:"",
country:""
},
applicationsInfo:[
{
application:"",
consumerKey:"",
accessToken:""
}
]
}
First I created user and latter I am to update applicationsInfo section when user creates an application. First I tried this way and It works
var consumerKey="asdyfsatfdtyafydsahyadsy";
var findCon={"userDetails.username":"someName"};
db.find(findCon,function(err,docs){
if(err){
console.log(err);
}else{
var updateCon={$set:{"applicationsInfo.0.consumerKey":consumerKey}};
db.update(findCon,updateCon,{},function(err,docs){
console.log(docs);
});
}
});
But actually what I want is update some selected one I tried that in this way.
........
var appNum=0;
var updateCon={$set:{"applicationsInfo."+appNum+".consumerKey":consumerKey}};
then I start my node server then I got error like this.
/home/jobs/nodeserver/routes/initusers.js:180
"applicationsInfo."+appNum+
^
SyntaxError: Unexpected token +
at Module._compile (module.js:439:25)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
You need to set it the below way:
var appNum = 0;
var updateCon = {$set:{}};
updateCon.$set["applicationsInfo."+appNum+".consumerKey"] = 1;
Setting an expression ("applicationsInfo."+appNum+".consumerKey") as key of an object during initialization is not allowed in java script.
I am trying to connect oracle with NodeJS. Steps followed as below. Pre - requisites there is no client installed except NodeJS(0.10.25) and npm(1.3.24).
In my ExpressJS Project:
npm install db-oracle
There is no error found while installing.
In app.js
var oracle = require('db-oracle');
var connString = "(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=xxxx)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=xxxx)))";
var connectData = { "tns": connString, "user": "XPPS_OWNER", "password": "Ex3ec" };
In one of the endpoint i coded like this,
app.get('/oracleendpoint',function(req,res){
connectData.connect(function(error) {
if (error) {
return console.log("CONNECTION ERROR: " + error);
}
this.query().select('*').from('Users').execute(function(error, rows) {
if (error) {
return console.log('ERROR: ' + error);
}
console.log(rows.length + ' ROWS');
});
});
});
Expected output is to connect the DB.
FYI: DB Instance is running fine.
Query:
What is the DB Name?
It is showing an error which show below. what would be root cause for this?
module.js:340
throw err;
^
Error: Cannot find module './build/Release/oracle_bindings'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous>
(C:\xampp\htdocs\mytest\node_modules\db-oracle\db-oracle.js:18:15)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
Please let me know any missing or Installation required or any node modules required or code changes. I have Googled but in vain. Haven't found proper document for this error.
Oracle themselves have just released an Oracle driver for node.js: https://blogs.oracle.com/opal/entry/introducing_node_oracledb_a_node
Looks promising.
In your example, you use db-oracle module, I would recommend to use node-oracle module instead, as it is more popular/better maintained.
To connect to Oracle DB from Node, you have to follow the instructions on the page mentioned above.
After migrating my application from IntoVPS to Digital Ocean, my application crashes when it tries to upload photos to AWS S3.
The differences between the servers are: IntoVPS was running Ubuntu 10.10, and Digital Ocean is running Debian; IntoVPS had node 0.8.x, and Digital Ocean has 0.10.26.
There are no firewalls on the new server that could be causing this issue (I've checked).
The crash errors are:
Error: read ECONNRESET
at errnoException (net.js:904:11)
at Pipe.onread (net.js:558:19)
Error: spawn ENOENT
at errnoException (child_process.js:988:11)
at Process.ChildProcess._handle.onexit (child_process.js:779:34)
Error: write EPIPE
at errnoException (net.js:904:11)
at Object.afterWrite (net.js:720:19)
Some of these might be related to forever trying to restart the process (I figured that's what spawn might mean). The one I'd focus on is the ECONNRESET one.
So, I'm running my process using forever, and I'm using the knox module to connect to S3.
After googling I found: https://github.com/LearnBoost/knox/issues/198
I tried adding res.resume() to the callback of putFile like it says in the, but nothing changes; I still get the ECONNRESET error.
I've spent an entire day (yesterday) trying to fix this issue, and I can't continue having my production application be broken, so I decided to try switching to an older version of Node in order to temporarily (but quickly) fix this issue. So, I installed the n module to try and get 0.8.26 as the node version installed. Unfortunately, n didn't work, and here's the issue I created on that: https://github.com/visionmedia/n/issues/170
EDIT:
After exiting my ssh session and opening a new one, n is working. However, switching to 0.8.26 version of node causes another errors:
/apps/Foobar/node_modules/dnode/node_modules/weak/node_modules/bindings/bindings.js:83
throw e
^
Error: Module version mismatch, refusing to load.
at Object.Module._extensions..node (module.js:485:11)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at bindings (/apps/Foobar/node_modules/dnode/node_modules/weak/node_modules/bindings/bindings.js:76:44)
at Object.<anonymous> (/apps/Foobar/node_modules/dnode/node_modules/weak/lib/weak.js:1:97)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at Object.<anonymous> (/apps/Foobar/node_modules/dnode/index.js:5:12)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at Object.<anonymous> (/apps/Foobar/controllers/sock.js:2:13)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at global.Controller (/apps/Foobar/globals.js:2:9)
at Object.<anonymous> (/apps/Foobar/controllers/generosity.js:209:12)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at global.Controller (/apps/Foobar/globals.js:2:9)
at Object.<anonymous> (/apps/Foobar/app.js:282:1)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
at process.startup.processNextTick.process._tickCallback (node.js:245:9)
As you can see I'm having the darnedest time trying to fix this issue with S3, and I'm to the point of crying (metaphorically). I can't keep wasting time on this issue, but I can't seem to solve it. It's almost like Node itself is broken.
Can anyone provide any insight on what's going on? Any help with this is appreciated.
Why isn't knox working anymore?
EDIT
Here's more details.
Code that errors:
// S3
var endpoint = "https://s3.amazonaws.com/"+global.config.aws.s3.bucket+"/";
var knox = require('knox');
var s3 = knox.createClient(global.config.aws.s3);
var photosPrefix = 'photos/';
var model = module.exports;
model.emitter = new events.EventEmitter;
// ::Photos
model.createPhoto = function(info, cb){
if (!info.file || path.resolve(info.file) === path.resolve(global.__tempdir))
return cb(new Error('missing info.file'));
var db = info.db;
var photoId;
if (typeof info.public === 'undefined')
info.public = false;
// Move file to a specific location
var basename = path.basename(info.file);
var destination = photosPrefix+basename+'/original';
yarn
(function(){
// Upload photo to AWS
s3.putFile(
info.file,
destination,
{
'Content-Type': 'image/png'
},
this());
})
(function(err, res){
if (err) return this.error(new Error(err));
// Remove temporary file
fs.unlink(info.file, this());
})
(function(err){
if (err) return this.error(new Error(err));
// Retrieve photo stream from AWS
s3.getFile(destination, this());
})
(function(err, res){
if (err) return this.error(new Error(err));
// Get the dimensions of the photo using the stream (res)
gm(res).size(this());
})
(function(err, size){
if (err) return this.error(new Error(err));
// Insert record into photos table (include the dimensions, width and height)
db.query("INSERT photos (resource, width, height, public) VALUES (?, ?, ?, ?)", [basename, size.width, size.height, info.public], this());
})
(function(err, results){
if (err) return this.error(new Error(err));
photoId = results.insertId;
cb(null, photoId);
})
.error(function(err){
cb(err);
});
}
All photos no matter what the size or format cause the same error.
I found that the issue wasn't with AWS and knox, but rather with gm and the fact that GraphicsMagick wasn't installed on my system.
For reference for others, if you're experiencing similar errors, remember that gm doesn't report that GraphicsMagick or ImageMagick are absent when they are absent. I reported this error on the gm module here: https://github.com/aheckmann/gm/issues/273
My code for server.js is:
var express = require('express');
var ENV = process.env['NODE_ENV'] || 'development';
var config = require('./config')[ENV];
// The express server to listen for both the clients
var main = express();
// Main application
main.use(express.vhost('vypics', require('./web_app/app').app))
// Example sub domain
main.use(express.vhost('android.vypics',require('./android_app/app').app));
main.listen(3000);
console.log('started on 3000');
when I am running node server.js I am getting the following error.
/Users/saransh2012/Developer/vypics/node_modules/express/node_modules/connect/lib/middleware/vhost.js:30
if (!server) throw new Error('vhost server required');
^
Error: vhost server required
at Function.vhost (/Users/saransh2012/Developer/vypics/node_modules/express/node_modules/connect/lib/middleware/vhost.js:30:22)
at Object.<anonymous> (/Users/saransh2012/Developer/vypics/server.js:8:18)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:901:3
Please help.....What Am i Doing wrong.
You'll get that error when the second argument to express.vhost is falsy.
My guess would be that either require('./web_app/app').app or require('./android_app/app').app (or both) is undefined.
The error was in the require('.web_app/app').app part as mentioned by robertklep.It was a very silly error on my part as i forgot to write the export for the app.
Sorry guys for such a silly error but sometimes those are the one very difficult to see.