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// ZeroTier distributed HTTP test agent
// ---------------------------------------------------------------------------
// Customizable parameters:
// Time between startup and first test attempt
var TEST_STARTUP_LAG = 10000;
// Maximum interval between test attempts (actual timing is random % this)
var TEST_INTERVAL_MAX = (60000 * 10);
// Test timeout in ms
var TEST_TIMEOUT = 30000;
// Where should I get other agents' IDs and POST results?
var SERVER_HOST = '52.26.196.147';
var SERVER_PORT = 18080;
// Which port do agents use to serve up test data to each other?
var AGENT_PORT = 18888;
// Payload size in bytes
var PAYLOAD_SIZE = 5000;
// ---------------------------------------------------------------------------
var ipaddr = require('ipaddr.js');
var os = require('os');
var http = require('http');
var async = require('async');
var express = require('express');
var app = express();
// Find our ZeroTier-assigned RFC4193 IPv6 address
var thisAgentId = null;
var interfaces = os.networkInterfaces();
if (!interfaces) {
console.error('FATAL: os.networkInterfaces() failed.');
process.exit(1);
}
for(var ifname in interfaces) {
var ifaddrs = interfaces[ifname];
if (Array.isArray(ifaddrs)) {
for(var i=0;i<ifaddrs.length;++i) {
if (ifaddrs[i].family == 'IPv6') {
try {
var ipbytes = ipaddr.parse(ifaddrs[i].address).toByteArray();
if ((ipbytes.length === 16)&&(ipbytes[0] == 0xfd)&&(ipbytes[9] == 0x99)&&(ipbytes[10] == 0x93)) {
thisAgentId = '';
for(var j=0;j<16;++j) {
var tmp = ipbytes[j].toString(16);
if (tmp.length === 1)
thisAgentId += '0';
thisAgentId += tmp;
}
}
} catch (e) {
console.error(e);
}
}
}
}
}
if (thisAgentId === null) {
console.error('FATAL: no ZeroTier-assigned RFC4193 IPv6 addresses found on any local interface!');
process.exit(1);
}
//console.log(thisAgentId);
// Create a random (and therefore not very compressable) payload
var payload = new Buffer(PAYLOAD_SIZE);
for(var xx=0;xx<PAYLOAD_SIZE;++xx) {
payload.writeUInt8(Math.round(Math.random() * 255.0),xx);
}
function agentIdToIp(agentId)
{
var ip = '';
ip += agentId.substr(0,4);
ip += ':';
ip += agentId.substr(4,4);
ip += ':';
ip += agentId.substr(8,4);
ip += ':';
ip += agentId.substr(12,4);
ip += ':';
ip += agentId.substr(16,4);
ip += ':';
ip += agentId.substr(20,4);
ip += ':';
ip += agentId.substr(24,4);
ip += ':';
ip += agentId.substr(28,4);
return ip;
};
var lastTestResult = null;
var allOtherAgents = {};
function doTest()
{
var submit = http.request({
host: SERVER_HOST,
port: SERVER_PORT,
path: '/'+thisAgentId,
method: 'POST'
},function(res) {
var body = '';
res.on('data',function(chunk) { body += chunk.toString(); });
res.on('end',function() {
if (body) {
try {
var peers = JSON.parse(body);
if (Array.isArray(peers)) {
for(var xx=0;xx<peers.length;++xx)
allOtherAgents[peers[xx]] = true;
}
} catch (e) {}
}
var agents = Object.keys(allOtherAgents);
if (agents.length > 1) {
var target = agents[Math.floor(Math.random() * agents.length)];
while (target === thisAgentId)
target = agents[Math.floor(Math.random() * agents.length)];
var testRequest = null;
var timeoutId = null;
timeoutId = setTimeout(function() {
if (testRequest !== null)
testRequest.abort();
timeoutId = null;
},TEST_TIMEOUT);
var startTime = Date.now();
testRequest = http.get({
host: agentIdToIp(target),
port: AGENT_PORT,
path: '/'
},function(res) {
var bytes = 0;
res.on('data',function(chunk) { bytes += chunk.length; });
res.on('end',function() {
lastTestResult = {
source: thisAgentId,
target: target,
time: (Date.now() - startTime),
bytes: bytes,
timedOut: (timeoutId === null),
error: null
};
if (timeoutId !== null)
clearTimeout(timeoutId);
return setTimeout(doTest,Math.round(Math.random() * TEST_INTERVAL_MAX) + 1);
});
}).on('error',function(e) {
lastTestResult = {
source: thisAgentId,
target: target,
time: (Date.now() - startTime),
bytes: 0,
timedOut: (timeoutId === null),
error: e.toString()
};
if (timeoutId !== null)
clearTimeout(timeoutId);
return setTimeout(doTest,Math.round(Math.random() * TEST_INTERVAL_MAX) + 1);
});
} else {
return setTimeout(doTest,1000);
}
});
}).on('error',function(e) {
console.log('POST failed: '+e.toString());
return setTimeout(doTest,1000);
});
if (lastTestResult !== null) {
submit.write(JSON.stringify(lastTestResult));
lastTestResult = null;
}
submit.end();
};
// Agents just serve up a test payload
app.get('/',function(req,res) { return res.status(200).send(payload); });
var expressServer = app.listen(AGENT_PORT,function () {
// Start timeout-based loop
setTimeout(doTest(),TEST_STARTUP_LAG);
});
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