I have made an online multiplayer game where the backend is nodejs, and sometimes when people test it, they spam bullets or use a script to create lots of players, I get an error. I have limits for this, so there can only be 500 bullets and 20 players in the game, and they all disappear eventually, but even when it doesn't let people create too many bullets/players, when they try to, I get this error:
zlib.js:499
var newReq = self._handle.write(flushFlag,
^
TypeError: Cannot read property 'write' of null
at Zlib.callback (zlib.js:499:33)
I am using socket.io with express. There is nothing to do with zlib in my code, and those are the only npm dependencies I am using.
A very slimmed down version of the code I'm using (which should ideally not have been shared in any form):
//Dependencies
var express = require("express");
var app = express();
var server = require('http').Server(app);
var io = require('socket.io')(server);
var fs = require('fs');
/* a bunch of vars + config */
//Express
server.listen(7654);
//Some functions
//Socket.io Listeners
io.on('connection', function(socket) {
//Declare Player
socket.on("declare player", function (data) {
if (Object.keys(players).length > maxPlayers) return; //Make sure no more than 20 players
//If statements to check valid data was sent
var playerdata = {
//Player Data
};
//Referral code stuff
//Secret Names
switch (playerdata.name) {
//Secret player codes for powerups
}
playerSecrets[data.id] = data.secret;
players[data.id] = playerdata;
});
//Player Action
socket.on("player action", function (data) {
/* Player controls input, mostly redacted */
switch (data.action.command) {
case "shoot": //Shoot Bullet
players[data.id].score--;
if (bullets.length > maxBullets) return; //Maximum Bullets in Arena (500)
bullets.push({/*bullet data*/});
break;
}
});
});
//Kill Player
function kill(playerid) {
delete players[playerid];
delete playerSecrets[playerid];
}
//Generate stars
//Game loop
setInterval(function () {
//Emit gamedata to clients
io.emit("gamedata", {
players: players,
stars: stars,
bullets: bullets,
referrals: referralData
});
//For each player
for (var i = 0; i < Object.keys(players).length; i++) {
//Redacted
}
//For each bullet
for (var i = 0; i < bullets.length; i++) {
//Redacted
}
}, 1000 / tickSpeed);
I wonder if it's related to things being added to JSON/Arrays, because that is what happens when a player is created/a bullet is shot, and spamming those causes this to happen. See socket.on("player action" and socket.on("declare player".
