var cql = require('node-cassandra-cql');
var client = new cql.Client({hosts: ['*.*.*.*'], keyspace: '*',
username:'*', password: '*'});
console.log('connected to ' , client);
console.log('Querying....');
client.execute('select * from example where field1=?', [1],
function(err, result) {
console.log('inside', result);
if (err)
console.log('execute failed',err);
else
console.log('got chat ' + result.rows[0].field1);
client.shutdown();
}
);
I am using this code, the execute() callbacks aren't getting called . To test I used an incorrect IP address, it immediately responds and this line console.log('execute failed',err) logs what is below.
execute failed { [PoolConnectionError]
name: 'PoolConnectionError',
info: 'Represents a error while trying to connect the pool, all the connections failed.',
individualErrors:
[ { Error: getaddrinfo ENOTFOUND
at errnoException (dns.js:28:10)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:79:26)
code: 'ENOTFOUND',
errno: 'ENOTFOUND',
syscall: 'getaddrinfo',
hostname: '*.*.*.*'
host: '*.*.*.*'
port: 9042 } ] }
If with right IP address nothing happens may because new cql.Client internally calls connect (asynchronously) before even connection is made execute is attempted ? All perfectly works in CQLSH, my servers are in AWS US west coast.
Any inputs welcome.
You are using the legacy Cassandra driver node-cassandra-cql, as the project readme states, it is no longer maintained:
node-cassandra-cql has graduated from community driver to being the
foundation of the official Datastax Node.js Driver for Apache Cassandra.
There will be no more development in this repository. I encourage
everyone to start migrating to the new driver as soon as you can, it's
got some great new features that you should try out, along with an
improved cql to javascript type mapping for prepared statements.
Use DataStax Node.js driver instead:
npm install cassandra-driver --save
Related
I'm getting the error described below when running my node.js app after perfoming a few api calls.
The error does not always show in the exactly same place/line of code. But most of the times it is at the end of the api call.
events.js:167
throw er; // Unhandled 'error' event
^
Error: connect ECONNREFUSED 127.0.0.1:443
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1113:14)
Emitted 'error' event at:
at TLSSocket.socketErrorListener (_http_client.js:391:9)
at TLSSocket.emit (events.js:182:13)
at emitErrorNT (internal/streams/destroy.js:82:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:50:3)
at process._tickCallback (internal/process/next_tick.js:63:19)
Based on similar questions here at SO my hypothesis is that a) there is something using 127.0.0.1:443 and therefore conflicting with my app or b) node is trying to use 127.0.0.1:443 but there is nothing there for it to use (my app is listening to localhost :3000).
Hyphothesis a) doesn't seem likely since after running netstat -ano | findstr 127.0.0.1:443 nothing shows up (when app is running and right after it terminates).
Also killed every node.exe and mongod.exeb using any port in my computer, closed the terminal and restarted the node app without success.
In case error is related with hypothesis b) I'm not sure how to address it.
api.post('/parsePOpdf', wagner.invoke(function(Pdfeq, Pdfdocspec, Product, User, Order){
return async function(req,res){
//... some code
pdfParser.on("pdfParser_dataError", errData => console.error(errData.parserError) );
pdfParser.on("pdfParser_dataReady", async function(pdfData) {
fs.writeFile("./test.json", JSON.stringify(pdfData), function(err){
console.log(err);
});
let pages = pdfData.formImage.Pages;
//console.log('pages 557', pages);
let order = {
orderDetails : {
supplier : [{
item : []
}]
}
};
for (const page of pages){
let value = await getItemsInPDF(page, productKeys, pdfParsingDetails, order, Product, customer, supplierLink, User);
//... more code
order = value;
}
return res.json(order);
});
pdfParser.loadPDF(pdfFile);
}
}));
I would expect the code to finish without throwing this error.
It turns out that the problem was in the api code: an http.get line to fetch a remote file was generating the conflict. This makes sense since the error was not present for other endpoints of the api.
So learning is that if the terminal reports no app using the suspected conflicting port (see question) answser should be within the same code and you need to go line by line to identify which one is causing the problem (instead of focusing on other apps trying to use the same port, like I was focusing on).
I am trying to track down why my code is failing with this error:
{ Error: connect ECONNREFUSED 127.0.0.1:443
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1082:14)
errno: 'ECONNREFUSED',
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 443 }
and the stack trace for that error looks like this:
Error: connect ECONNREFUSED 127.0.0.1:443
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1082:14)
I am making a network connection, but I am not trying to connect to localhost.
The network code I am using works just fine (and connects to the right host) in other contexts.
I'm using node 11.6.0 as supplied by brew install, and it looks like the only occurrence of the string "net.js" in the brew "Cellar" directory structure is in the node binary itself. In other words, even after
brew install --build-from-source node
running
find /usr/local/Cellar/node/11.6.0 -type f | xargs fgrep -l net.js
only finds one file: /usr/local/Cellar/node/11.6.0/bin/node and there's no net.* files in that directory tree.
If it matters, my code which seems to trigger this error looks like this:
const get_json_with_auth= async (channel, url) => {
const parsed_url= URL.parse(url);
return new Promise((good, fail) => {
let request= require('https').get({
hostname: parsed_url.hostname,
path: parsed_url.path,
headers: {
Authorization: get_auth('GET', channel, url)
}
});
console.log('url', url);
request.on('response', response=> {
const chunks= [];
response.on('data', data=> chunks.push(data));
response.on('end', ()=> good(JSON.parse(Buffer.concat(chunks).toString())));
});
request.on('error', err=> fail(err));
});
};
(I'm on OSX high sierra here.)
But, once again, the host name in the url I'm using does not resolve to localhost (and works just fine in other contexts).
How do I isolate a problem like this?
Running my code with the environmental variable NODE_DEBUG='net,tls,http,https' gave me enough information to recognize (and isolate) the problem.
I am getting error for even a simple nodejs redis commands.
This is the error I am getting.
/home/veera/Radha/node_modules/redis-client/lib/redis-client.js:394
var callback = originalCommand[originalCommand.length - 1];
^
TypeError: Cannot read property 'length' of undefined
at Client.onReply_ (/home/veera/Radha/node_modules/redis-client/lib/redis-client.js:394:51)
at maybeCallbackWithReply (/home/veera/Radha/node_modules/redis-client/lib/redis-client.js:143:30)
at ReplyParser.feed (/home/veera/Radha/node_modules/redis-client/lib/redis-client.js:183:29)
at Socket. (/home/veera/Radha/node_modules/redis-client/lib/redis-client.js:337:28)
at Socket.emit (events.js:95:17)
at Socket. (_stream_readable.js:765:14)
at Socket.emit (events.js:92:17)
at emitReadable_ (_stream_readable.js:427:10)
at emitReadable (_stream_readable.js:423:5)
at readableAddChunk (_stream_readable.js:166:9)
And the code is,
var client = require("./redis-node-client/lib/redis-client").createClient();
client.set('test', 'data');
My redis version is ,
redis-server --version
Redis server v=3.0.4 sha=00000000:0 malloc=jemalloc-3.6.0 bits=64 build=4e722bd58502cba0
https://github.com/fictorial/redis-node-client/issues/26 - same issue has been discussed long time back but the version they are discussing is 1.2.
My version is 3.0.4.
Please help me to fix this issue.
It looks like this library is no more supported. ( Description itself says abandoned project.) Unless you have strict requirement, use actively developed and production ready library like node-redis.
Example using node-redis
var client = require("node-redis").createClient();
client.set('test', 'data');
client.get('test',function(err, data){
if(err) console.log(err);
else console.log('reply from redis:' + data);
});
client.quit();
I'm using node.js with socket.io to give my web page access to character data served by a TCP socket. I'm quite new to node.js.
User ----> Web Page <--(socket.io)--> node.js <--(TCP)--> TCP Server
The code is mercifully brief:
io.on('connection', function (webSocket) {
tcpConnection = net.connect(5558, 'localhost', function() {});
tcpConnection.on('error', function(error) {
webSocket.emit('error', error);
tcpConnection.close();
});
tcpConnection.on('data', function(tcpData) {
webSocket.emit('data', { data: String.fromCharCode.apply(null, new Uint8Array(tcpData))});
});
});
It all works just fine in the normal case, but I can't guarantee that the TCP server will be there all the time. When it isn't, the TCP stack returns ECONNREFUSED to node.js - this is entirely expected and I need to handle it gracefully. Currently, I see:
events.js:72
throw er; // Unhandled 'error' event
^
Error: connect ECONNREFUSED
at errnoException (net.js:904:11)
at Object.afterConnect [as oncomplete] (net.js:895:19)
... and the whole process ends.
I've done a lot of searching for solutions to this; most hits seem to be from programmers asking why ECONNREFUSED is received in the first place - and the advice is simply to make sure that the TCP server is available. No discussing of handling failure cases.
This post - Node.js connectListener still called on socket error - suggests adding a handler for the 'error' event as I've done in the code above. This is exactly how I would like it to work ... except it doesn't (for me), my program does not trap ECONNREFUSED.
I've tried to RTFM, and the node.js docs at http://nodejs.org/api/net.html#net_event_error_1 suggest that there is indeed an 'error' event - but give little clue how to use it.
Answers to other similar SO posts (such as Node.js Error: connect ECONNREFUSED ) advise a global uncaught exception handler, but this seems like a poor solution to me. This is not my program throwing an exception due to bad code, it's working fine - it's supposed to be handling external failures as it's designed to.
So
Am I approaching this in the right way? (happy to admit this is a newbie error)
Is it possible to do what I want to do, and if so, how?
Oh, and:
$ node -v
v0.10.31
I ran the following code:
var net = require('net');
var client = net.connect(5558, 'localhost', function() {
console.log("bla");
});
client.on('error', function(ex) {
console.log("handled error");
console.log(ex);
});
As I do not have 5558 open, the output was:
$ node test.js
handled error
{ [Error: connect ECONNREFUSED]
code: 'ECONNREFUSED',
errno: 'ECONNREFUSED',
syscall: 'connect' }
This proves that the error gets handled just fine... suggesting that the error is happening else-where.
As discussed in another answer, the problem is actually this line:
webSocket.emit('error', error);
The 'error' event is special and needs to be handled somewhere (if it isn't, the process ends).
Simply renaming the event to 'problem' or 'warning' results in the whole error object being transmitted back through the socket.io socket up to the web page:
webSocket.emit('warning', error);
The only way I found to fix this is wrapping the net stuff in a domain:
const domain = require('domain');
const net = require('net');
const d = domain.create();
d.on('error', (domainErr) => {
console.log(domainErr.message);
});
d.run(() => {
const client = net.createConnection(options, () => {
client.on('error', (err) => {
throw err;
});
client.write(...);
client.on('data', (data) => {
...
});
});
});
The domain error captures error conditions which arise before the net client has been created, such as an invalid host.
See also: https://nodejs.org/api/domain.html
I am implementing a node app, which brings in order details from BigCommerce.
Multiple calls are made to BigCommerce API asynchronously using Restify JsonClient.
It works fine for some calls but after that i gives error: [Error: socket hang up] code: 'ECONNRESET', sslError: undefined, body: {}
I have tried turning off socket pooling ie by setting agent=false, but it still gives same error.
Following is code which makes call to BigCommerce API
makeRequest = function (url, params, headers, orderDetails, cb) {
var options = {
headers: headers
};
var client = restify.createJsonClient({
url: url
});
client.get(options, function(err, req, res, obj) {
if(err){
console.log(err);
cb(err,obj);
} else if(obj != null) {
var result = obj;
if(orderDetails == null) {
cb(null,result);
} else {
cb(null, result , orderDetails);
}
}
});
};
I get following error:
{ [Error: socket hang up] code: 'ECONNRESET', sslError: unde
fined, body: {} } Error: socket hang up
at SecurePair.error (tls.js:993:23)
at EncryptedStream.CryptoStream._done (tls.js:689:22)
at CleartextStream.read [as _read] (tls.js:490:24)
at CleartextStream.Readable.read (_stream_readable.js:320:10)
at EncryptedStream.onCryptoStreamFinish (tls.js:301:47)
at EncryptedStream.g (events.js:175:14)
at EncryptedStream.EventEmitter.emit (events.js:117:20)
at finishMaybe (_stream_writable.js:352:12)
at endWritable (_stream_writable.js:359:3)
at EncryptedStream.Writable.end (_stream_writable.js:337:5)
at EncryptedStream.CryptoStream.end (tls.js:628:31)
at Socket.onend (_stream_readable.js:483:10)
Why am i getting such error? How can i handle it?
Thanks
I just wanted to make sure that you're setting the agent setting in the right area.
Include the
"agent": false
in your options. (It's not set in the options in the code you pasted)
Per gfpacheco in the comments here: https://github.com/restify/node-restify/issues/485
By default NodeJS uses agents to keep the TCP connection open, so you can reuse it.
The problem is that if the server is closed, or it closes your connection for whatever reason you get the ECONNRESET error.
To close the connection every time you just need to set agent: false in your client creation
I've tried this solution and it worked for me.
Other than that, the
"secureOptions": "constants.SSL_OP_NO_TLSv1_2"
solution posted here sounds like it could be the right path, since you're getting an sslError.
Maybe you are running into this issue https://github.com/joyent/node/issues/5360
TL;DR: You could try with latest node version and secureOptions: constants.SSL_OP_NO_TLSv1_2 added to your options.