uptime-kuma/server/ping-lite.js

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// https://github.com/ben-bradley/ping-lite/blob/master/ping-lite.js
// Fixed on Windows
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let spawn = require("child_process").spawn,
events = require("events"),
fs = require("fs"),
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WIN = /^win/.test(process.platform),
LIN = /^linux/.test(process.platform),
MAC = /^darwin/.test(process.platform);
module.exports = Ping;
function Ping(host, options) {
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if (!host) {
throw new Error("You must specify a host to ping!");
}
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this._host = host;
this._options = options = (options || {});
events.EventEmitter.call(this);
if (WIN) {
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this._bin = "c:/windows/system32/ping.exe";
this._args = (options.args) ? options.args : [ "-n", "1", "-w", "5000", host ];
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this._regmatch = /[><=]([0-9.]+?)ms/;
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} else if (LIN) {
this._bin = "/bin/ping";
this._args = (options.args) ? options.args : [ "-n", "-w", "2", "-c", "1", host ];
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this._regmatch = /=([0-9.]+?) ms/; // need to verify this
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} else if (MAC) {
this._bin = "/sbin/ping";
this._args = (options.args) ? options.args : [ "-n", "-t", "2", "-c", "1", host ];
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this._regmatch = /=([0-9.]+?) ms/;
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} else {
throw new Error("Could not detect your ping binary.");
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}
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if (!fs.existsSync(this._bin)) {
throw new Error("Could not detect " + this._bin + " on your system");
}
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this._i = 0;
return this;
}
Ping.prototype.__proto__ = events.EventEmitter.prototype;
// SEND A PING
// ===========
Ping.prototype.send = function(callback) {
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let self = this;
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callback = callback || function(err, ms) {
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if (err) {
return self.emit("error", err);
}
return self.emit("result", ms);
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};
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let _ended, _exited, _errored;
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this._ping = spawn(this._bin, this._args); // spawn the binary
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this._ping.on("error", function(err) { // handle binary errors
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_errored = true;
callback(err);
});
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this._ping.stdout.on("data", function(data) { // log stdout
this._stdout = (this._stdout || "") + data;
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});
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this._ping.stdout.on("end", function() {
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_ended = true;
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if (_exited && !_errored) {
onEnd.call(self._ping);
}
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});
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this._ping.stderr.on("data", function(data) { // log stderr
this._stderr = (this._stderr || "") + data;
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});
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this._ping.on("exit", function(code) { // handle complete
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_exited = true;
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if (_ended && !_errored) {
onEnd.call(self._ping);
}
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});
function onEnd() {
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let stdout = this.stdout._stdout,
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stderr = this.stderr._stderr,
ms;
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if (stderr) {
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return callback(new Error(stderr));
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}
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if (!stdout) {
return callback(new Error("No stdout detected"));
}
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ms = stdout.match(self._regmatch); // parse out the ##ms response
ms = (ms && ms[1]) ? Number(ms[1]) : ms;
callback(null, ms);
}
};
// CALL Ping#send(callback) ON A TIMER
// ===================================
Ping.prototype.start = function(callback) {
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let self = this;
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this._i = setInterval(function() {
self.send(callback);
}, (self._options.interval || 5000));
self.send(callback);
};
// STOP SENDING PINGS
// ==================
Ping.prototype.stop = function() {
clearInterval(this._i);
};