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keepalive.js
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keepalive.js
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"use strict";
const util = require("util");
const v8 = require("v8");
const tls = require("tls");
const https = require("https");
const fs = require("fs");
class TestServer {
constructor() {
this.response = "HTTP/1.1 200 OK\r\n" +
"Connection: keep-alive\r\n" +
"Content-Length: 1\r\n" +
"Content-Type: text/plain\r\n\r\n!";
this.server = tls.createServer({
key: fs.readFileSync("certs/localhost-key.pem"),
cert: fs.readFileSync("certs/localhost-cert.pem")
}, socket => {
console.log(`server: incoming connection ${socket.remotePort}`);
socket.on("data", chunk => {
console.log(`server: chunk on ${socket.remotePort}: size: ${chunk.length}`);
setTimeout(() => socket.write(this.response), 1000);
});
socket.on("end", () => {
console.log(`server: connection end ${socket.remotePort}`);
});
});
this.server.on("error", error => {
console.log(`server: error: ${error}`);
console.dir(error);
});
this.server.listen(2000, () => {
console.log("server: listening on port 2000");
});
}
close() {
return new Promise(resolve => this.server.close(resolve));
}
}
class TestClient {
constructor() {
this.agent = new https.Agent({
keepAlive: true,
timeout: 3000,
maxSockets: 150,
maxFreeSockets: 256,
maxCachedSessions: 100
});
this.requestOptions = {
agent: this.agent,
timeout: 2000,
protocol: "https:",
hostname: "localhost",
port: 2000,
ca: fs.readFileSync("certs/localhost-cert.pem")
};
}
sendRequest() {
return new Promise((resolve, reject) => {
const clientRequest = https.request(this.requestOptions, response => {
response.setEncoding("utf8");
let received = "";
let chunkCount = 0;
response.on("data", chunk => {
received += chunk;
chunkCount += 1;
});
response.on("end", () => {
console.log(`client: end: chunks: ${chunkCount}`);
resolve(received);
});
});
clientRequest.on("error", error => {
console.log(`client: error: ${error}`);
reject(error);
});
clientRequest.on("timeout", () => {
console.log(`client: timeout`);
clientRequest.destroy(new Error("custom timeout"));
});
clientRequest.end();
});
}
inspect(description, arg) {
const count = Object.keys(arg).flatMap(key => arg[key]).length;
console.log(`${description}: ${util.inspect(count, true, 0)}`);
}
logSockets() {
this.inspect("requests", this.agent.requests);
this.inspect("freeSockets", this.agent.freeSockets);
this.inspect("sockets", this.agent.sockets);
}
close() {
this.agent.destroy();
}
}
class TestRun {
constructor() {
this.server = new TestServer();
this.client = new TestClient();
}
async sendUserRequests() {
await this.client.sendRequest();
await this.client.sendRequest();
}
async sendRequestSet() {
const requestsDone = [];
for (let i = 0; i < 100; i++) {
requestsDone.push(this.sendUserRequests());
}
this.client.logSockets();
await Promise.all(requestsDone);
this.client.logSockets();
// let keep alive timeout close connections
await new Promise(resolve => setTimeout(resolve, 5000));
this.client.logSockets();
}
async run() {
for (let i = 0; i < 5; i++) {
await this.sendRequestSet();
}
this.client.close();
await this.server.close();
}
}
new TestRun().run().catch(console.dir).then(() => {
if (global.gc) {
global.gc();
console.log("collected garbage");
}
v8.writeHeapSnapshot();
});