log4js-logstash-tcp
Version:
This is a copy of the logstashUDP appender but instead sending via UDP send via TCP to avoid the maximum 64k bytes message size with the logstashUDP appender.
475 lines (461 loc) • 19.3 kB
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<h1><a href="../../index.html">All files</a> / <a href="index.html">log4js-logstash-tcp/classes</a> TcpConnectionPool.js</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
const net = require("net");
const EventEmitter = require('events');
const DEFAULT_MAX_TCP_CONNECTIONS = 300;
class TcpConnectionWrapper extends EventEmitter {
constructor(host, port, config) {
super();
this.connectionNotReadyRetryInterval = parseInt(config.connectionNotReadyRetryInterval || 500);
this.connectionTimeout = parseInt(config.connectionTimeout || 5000);
const self = this;
this.connection = net.connect({
host: host,
port: port
}, function() {
self.connected = true;
});
this.connection.setTimeout(this.connectionTimeout);
this.connection.on("timeout", <span class="fstat-no" title="function not covered" >()</span> => {<span class="cstat-no" title="statement not covered" >self.destroy()}</span>);
this.connection.on("close", () => {self.destroy()});
this.connection.on("error", <span class="fstat-no" title="function not covered" >(e</span>rr) => {
<span class="cstat-no" title="statement not covered" > console.error(`logstash Error with the connection to ${host}:${port}. ${err}`);</span>
// From docs: "The close event will be called just after this one
});
}
send(logObject) {
const message = ( (obj) => {
<span class="missing-if-branch" title="if path not taken" >I</span>if (typeof obj === "string") {
<span class="cstat-no" title="statement not covered" > return obj + "\n";</span>
} else {
return JSON.stringify(obj) + "\n";
}
} )(logObject);
this.realSend(message);
}
realSend(message) {
const self = this;
if(this.connected === true) {
this.connection.write(message)
} else {
const timeout = setTimeout(() => {
self.realSend(message);
clearTimeout(timeout);
}, this.connectionNotReadyRetryInterval);
}
}
destroy(cb) {
const self = this;
this.connection.end(() => {
self.connection.destroy();
if (typeof cb === "function") {
cb();
}
});
this.emit("destroy");
}
}
class TcpConnectionPool {
constructor(config) {
this.tcpConnections = {}
<span class="missing-if-branch" title="if path not taken" >I</span>if(config) <span class="cstat-no" title="statement not covered" >this.config = config;</span>
else this.config = {};
<span class="missing-if-branch" title="else path not taken" >E</span>if(!this.config.maxTcpConnections) {
this.config.maxTcpConnections = DEFAULT_MAX_TCP_CONNECTIONS;
}
}
send(host, port, logObject) {
this._getTcpConnection(host, port).send(logObject);
}
_getTcpConnection(host, port) {
const index = this._createIndexForTcpConnection();
return this.tcpConnections[index] || this._createTcpConnection(index, host, port);
}
_createTcpConnection(index, host, port) {
const self = this;
const tcpConnectionWrapper = new TcpConnectionWrapper(host, port, this.config);
this.tcpConnections[index] = tcpConnectionWrapper;
tcpConnectionWrapper.on("destroy", () => {
delete self.tcpConnections[index];
});
return tcpConnectionWrapper;
}
_createIndexForTcpConnection() {
return Math.floor( Math.random() * this.config.maxTcpConnections) % this.config.maxTcpConnections;
}
close(cb) {
const connections = [];
Object.keys(this.tcpConnections).forEach((index) => {
connections.push(this.tcpConnections[index]);
});
let completed = 0;
const complete = () => {
<span class="missing-if-branch" title="else path not taken" >E</span>if (++completed >= connections.length) {
<span class="missing-if-branch" title="else path not taken" >E</span>if (typeof cb === "function") {
cb();
}
}
};
for (const tcpConnectionWrapper of connections) {
tcpConnectionWrapper.destroy(complete);
}
}
}
module.exports.TcpConnectionPool = TcpConnectionPool;
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