Develop Reference

Why does ioredis client timeout when keep-alive is enabled?

I have been getting the following error, when my script stays idle for sometime. I cannot understand the reason for this.
error: [ioredis] Unhandled error event:
error: Error: read ECONNRESET
at TCP.onStreamRead (internal/stream_base_commons.js:111:27)
error: [ioredis] Unhandled error event
error: Error: read ETIMEDOUT
at TCP.onStreamRead (internal/stream_base_commons.js:111:27)
I initialize my redis client as :
let redis = require("ioredis");
redis = Promise.promisifyAll(redis);
const redis = new redis({
host: "my hostname",
port: 6379,
password: "some password"
});
and I am using ioredis client.
Does anyone know the reason for this? The keep-alive is already enabled by default as suggested here https://github.com/luin/ioredis/blob/master/API.md
I want the client to never timeout and reconnect if the timeout occurs. I am using Redis service by azure.

We have an entire document that covers this topic: Troubleshoot Azure Cache for Redis timeouts
If using the StackExchange.Redis Client the best practice of using the following pattern is suggested:
private static Lazy<ConnectionMultiplexer> lazyConnection = new Lazy<ConnectionMultiplexer>(() =>
{
return ConnectionMultiplexer.Connect("cachename.redis.cache.windows.net,abortConnect=false,ssl=true,password=...");
});
public static ConnectionMultiplexer Connection
{
get
{
return lazyConnection.Value;
}
}
In the case of ioredis, you can set a client property: [options.lazyConnect]
You will also want to look at any retry methods available with your client. I hope this helps.

Google cloud functions error on redis createClient when using in async mode

I have a few google cloud functions which make use of the redis memory store and it gives me this Redis connection to :6379 failed - read ECONNRESET at TCP. onread error every time any of function deployed. Previously I shared the createClient() code with all of the functions by creating a separate util file and including them on the CFs, I thought that was the issue. But please note that this Redis cache is working as expected other than this error.
Then I tried putting util code inside each of the google cloud functions which use the redis client to create the client. But I'm still getting this error from every cloud functions when every I deploy any of a cloud function. Even when deploying the functions that do not use the redis.
Here's how I create a client :
const bluebird = require('bluebird');
const redis = bluebird.promisifyAll(require('redis'));
const cache = redis.createClient({ port: REDIS_PORT, host: REDIS_HOST });
cache.on("error", (err) => {
console.log("API One - Redis cache error : " + err);
});
const list = async(data) => {
// Do something with data.
let cachedData;
if(cache.connected) {
await cache.hgetAsync(key); // Get cached Data.
}
// Do something with cached data if cachedData available.
if(cache.connected) {
await cache.hsetAsync(key, data); // Set Some Data.
}
return data;
}
module.exports = functions.https.onCall(list);
Why I'm seeing this error on every cloud function logs?
Sample error logs I get:
API One - Redis cache error : Error: Redis connection to <Ip Address>:6379 failed - read ECONNRESET
API Two - Redis cache error : Error: Redis connection to <Ip Address>:6379 failed - read ECONNRESET

Have you tried closing the redis connection before the function finishes?
The redis module may have background callbacks active during the life of the client, not closing the connection prior to function termination may be causing the connection to timeout when the cloud function terminates. Make sure that all asynchronous operations finish before the function terminates.
For example:
Example
Let me know if this works for you.

Error: 12 UNIMPLEMENTED: unknown service discovery.Discovery Using Hyperledger Fabric Node sdk Service Discovery

I am trying to use the service discovery by bootstrapping (providing anchor peer) following this documentation: https://fabric-sdk-node.github.io/tutorial-discovery.html. Below is where the error is.
controller.js Error: 12 UNIMPLEMENTED: unknown service discovery.Discovery (I have tried different permutations of the channel.initialize method).
let fabric_client = new Fabric_Client();
let channel = fabric_client.newChannel('mychannel');
let peer = fabric_client.newPeer('grpc://localhost:7051');
channel.addPeer(peer);
try {
let discovery_response = await channel.initialize({
discover: true,
target: peer,
asLocalhost: true
});
} catch (error) {
console.log('discovery response: ', error || discovery_response);
}
I have also added the gossip protocol to the peer docker environment. Also I already able to submit transactions and use the node sdk with no issues except for the service discovery.

The solution was to upgrade the network peers to version 1.2
https://hyperledger-fabric.readthedocs.io/en/latest/upgrading_your_network_tutorial.html

Node JS VPN connect to endpoint

I hope you can help!
I have setup and Amazon echo applcation, the application makes a request to and AWS EC2 instance and gets JSON data as a response, this is working as expected however the use case for the final application is to connect to a private IP sending paramaters to an API to return the same JSON DATA.
for many reasons sadly I cannot share any of the endpoint information.
I need my NODE.js Application to make a request to the private IP over a VPN connection, Im currently using OPENVPN to make local requests to the endpoint.
I have looked at node packages to see if this is possible but I cannot seem to find one, except for this package here
https://www.npmjs.com/package/node-openvpn
This package is has a dependancy thats fails to download, so i got the node_module manually but Im getting an error when i try to execute the code
var openvpnmanager = require('node-openvpn');
var opts = {
host: 'xx.xx.xx.xx', // normally '127.0.0.1', will default to if undefined
port: 443, //port openvpn management console
timeout: 1500, //timeout for connection - optional, will default to 1500ms if undefined
logpath: 'log.txt' //optional write openvpn console output to file, can be relative path or absolute
};
var auth = {
user: '*******',
pass: '*******',
};
var openvpn = openvpnmanager.connect(opts)
openvpn.on('connected', function() { //will be emited on successful interfacing with openvpn instance
openvpnmanager.authorize(auth);
});
openvpn.on('console-output', function(output) { //emits console output of openvpn instance as a line
console.log(output)
});
openvpn.on('state-change', function(state) { //emits console output of openvpn state as a array
console.log(output)
});
// openvpnmanager.getLog(console.log) //get all console logs up to this point
// and finally when/if you want to
// openvpnmanager.disconnect();
openvpn.on('disconnected', function() { //emits on disconnect
openvpnmanager.destroy() //finally destroy the disconnected manager
});
this just gives me an error
Unhandled rejection TypeError: Cannot read property 'writable' of undefined
at Telnet.exec (C:\Users\user\Desktop\alexa- po\node_modules\node-openvpn\node_modules\telnet-client\lib\telnet- client.js:90:24)
If anybody has any suggetions on how to make this possible I would be very grateful.

Node js + Sails js + websocket app crashing every few hours

I am having a problem similar to socket.io issue using sails.js. Every once in a while (once per day, or even few hours, it varies), a visitor to the web site/app will crash Node, seemingly due to the way his websocket client tries to connect. Anyway, here's the crash log:
debug: Lowering sails...
/Volumes/Two/Sites/lsdfinder/node_modules/sails/node_modules/express/node_modules/connect/lib/utils.js:216
return 0 == str.indexOf('s:')
^
TypeError: Cannot call method 'indexOf' of undefined
at exports.parseSignedCookie (/Volumes/Two/Sites/lsdfinder/node_modules/sails/node_modules/express/node_modules/connect/lib/utils.js:216:19)
at Manager.socketAttemptingToConnect (/Volumes/Two/Sites/lsdfinder/node_modules/sails/lib/hooks/sockets/authorization.js:35:26)
at Manager.authorize (/Volumes/Two/Sites/lsdfinder/node_modules/sails/node_modules/socket.io/lib/manager.js:910:31)
at Manager.handleHandshake (/Volumes/Two/Sites/lsdfinder/node_modules/sails/node_modules/socket.io/lib/manager.js:786:8)
at Manager.handleRequest (/Volumes/Two/Sites/lsdfinder/node_modules/sails/node_modules/socket.io/lib/manager.js:593:12)
at Server.<anonymous> (/Volumes/Two/Sites/lsdfinder/node_modules/sails/node_modules/socket.io/lib/manager.js:119:10)
at Server.EventEmitter.emit (events.js:98:17)
at HTTPParser.parser.onIncoming (http.js:2076:12)
at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:120:23)
at Socket.socket.ondata (http.js:1966:22)
9 Oct 10:42:24 - [nodemon] app crashed - waiting for file changes before starting...
In config/sockets.js, authorization is set to true. Not sure what else to do, where to fix this. Any suggestions? I can read the Sails docs too, but this appears to be a problem in Express/Connect, no? Thanks.
...René

The problem is that once every so often, a client will connect that has no cookies. Sails.js is using util.parseSignedCookie() from Connect without checking for errors, and therefore an error is thrown. This is what it looks like in Sails:
if (handshake.headers.cookie) {
handshake.cookie = cookie.parse(handshake.headers.cookie);
handshake.sessionID = parseSignedCookie(handshake.cookie[sails.config.session.key], sails.config.session.secret);
}
If you take a look into the cookieParser() middleware of Connect, you can see error checking is required:
if (cookies) {
try {
req.cookies = cookie.parse(cookies);
if (secret) {
req.signedCookies = utils.parseSignedCookies(req.cookies, secret);
req.signedCookies = utils.parseJSONCookies(req.signedCookies);
}
req.cookies = utils.parseJSONCookies(req.cookies);
} catch (err) {
err.status = 400;
return next(err);
}
}
I've created a Gist here that fixes the problem, and will submit a pull request to Sails.js when I have the time. The Gist uses Connect's cookieParser() middleware to automatically handle errors. If you want to use this, modify this file in your modules folder:
node_modules/sails/lib/hooks/sockets/authorization.js

If you are doing a crossdomain request, you could turn off authorization.
In *site_dir/config/sockets.js* set authorization to false. One way of doing it. You can also call your api with something like this
bash
**http://localhost:1337?cookie=smokeybear**
Its is in the comments on the sockets.js file.