feat: export HttpAgent as standalone class to avoid namespace clutt…

…er and support ESM style imports (#119)

This PR changes that `HttpAgent` class is exported as standalone member,
allowing use of `import { HttpAgent } from 'agentkeepalive'; or `const
HttpAgent = require('agentkeepalive').HttpAgent;`
It also deprecates use of `import * as HttpAgent from 'agentkeepalive';
or `const HttpAgent = require('agentkeepalive');`

This way fixing case when using Typescript and having
`"esModuleInterop": false` (that is the default), users can not import
and use the `HttpAgent` class and construct objects of it, because of
compiler / type errors like `Type 'typeof AgentKeepAlive' has no
construct signatures.`

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Documentation**
- Updated README.md with consistent usage of `HttpAgent` instead of
`Agent`
	- Renamed code examples to use `HttpAgent` across documentation

- **Refactor**
	- Renamed `Agent` to `HttpAgent` in multiple files and test fixtures
	- Updated TypeScript type definitions and import statements
	- Modified module export structure in `index.js`

- **Tests**
	- Updated test files to use `HttpAgent`
	- Adjusted test configurations and compiler options

- **Security**
- Increased key size from 1024 to 2048 bits in test key generation
script

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

README.md

@@ -61,9 +61,9 @@ $ npm install agentkeepalive --save
 
 ```js
 const http = require('http');
-const Agent = require('agentkeepalive');
+const HttpAgent = require('agentkeepalive').HttpAgent;
 
-const keepaliveAgent = new Agent({
+const keepaliveAgent = new HttpAgent({
   maxSockets: 100,
   maxFreeSockets: 10,
   timeout: 60000, // active socket keepalive for 60 seconds
@@ -162,8 +162,8 @@ When server closes connection at unfortunate time ([keep-alive race](https://cod
 
 ```js
 const http = require('http');
-const Agent = require('agentkeepalive');
-const agent = new Agent();
+const HttpAgent = require('agentkeepalive').HttpAgent;
+const agent = new HttpAgent();
 
 const req = http
   .get('http://localhost:3000', { agent }, (res) => {

benchmark/echo.js

@@ -1,8 +1,8 @@
 'use strict';
 
-const Agent = require('../');
+const HttpAgent = require('../').HttpAgent;
 
-const agent = new Agent({
+const agent = new HttpAgent({
   keepAlive: true,
   maxSockets: 2,
   maxFreeSockets: 2,
@@ -54,7 +54,7 @@ function showAgentDetail() {
   }
 
   const requestPerSocket = agent.createSocketCount && agent.requestFinishedCount / agent.createSocketCount;
-  console.log('[%s] [worker:%d] Agent(%s,%sms,%s,%s): requests: %d, created: %d, timeout: %d, reqs/socket: %s, pedding requests: %j, alive sockets: %j, free sockets: %j',
+  console.log('[%s] [worker:%d] HttpAgent(%s,%sms,%s,%s): requests: %d, created: %d, timeout: %d, reqs/socket: %s, pedding requests: %j, alive sockets: %j, free sockets: %j',
     Date(), process.pid,
     agent.keepAlive && agent.options.keepAlive, agent.keepAliveMsecs,
     agent.maxSockets, agent.maxFreeSockets,

benchmark/proxy.js

@@ -1,19 +1,19 @@
 'use strict';
 
 var http = require('http');
-var AgentKeepalive = require('../');
+var HttpAgent = require('../').HttpAgent;
 
 var maxSockets = parseInt(process.argv[2]) || 10;
 var maxFreeSockets = parseInt(process.argv[3]) || maxSockets;
 var SERVER = process.argv[4] || '127.0.0.1';
 
-var agentKeepalive = new AgentKeepalive({
+var agentKeepalive = new HttpAgent({
   keepAlive: true,
   maxSockets: maxSockets,
   maxFreeSockets: maxFreeSockets,
   keepAliveTimeout: 30000,
 });
-var agentHttp = new AgentKeepalive({
+var agentHttp = new HttpAgent({
   maxSockets: maxSockets,
   keepAlive: false,
 });

example/agent.js → example/http_agent.js

@@ -1,17 +1,17 @@
 'use strict';
 
 const http = require('http');
-const Agent = require('..');
+const HttpAgent = require('..').HttpAgent;
 
-const agent = new Agent();
+const http_agent = new HttpAgent();
 // https://www.google.com/search?q=nodejs&sugexp=chrome,mod=12&sourceid=chrome&ie=UTF-8
 
 const options = {
   host: 'www.taobao.com',
   path: '/',
   method: 'GET',
   port: 80,
-  agent,
+  agent: http_agent,
 };
 
 function get() {
@@ -34,15 +34,15 @@ function get() {
 get();
 
 setTimeout(() => {
-  console.log('keep alive sockets:', agent);
+  console.log('keep alive sockets:', http_agent);
   process.exit();
 }, 300000);
 
 let count = 0;
 setInterval(() => {
-  const name = agent.getName(options);
-  const sockets = agent.sockets[name] || [];
-  const freeSockets = agent.freeSockets[name] || [];
+  const name = http_agent.getName(options);
+  const sockets = http_agent.sockets[name] || [];
+  const freeSockets = http_agent.freeSockets[name] || [];
   console.log('%ss, %s, sockets: %d, destroyed: %s, free sockets: %d, destroyed: %s', ++count,
     name, sockets.length, sockets[0] && sockets[0].destroyed,
     freeSockets.length, freeSockets[0] && freeSockets[0].destroyed);

index.d.ts

@@ -6,7 +6,7 @@ interface PlainObject {
   [key: string]: any;
 }
 
-declare class HttpAgent extends http.Agent {
+declare class _HttpAgent extends http.Agent {
   constructor(opts?: AgentKeepAlive.HttpOptions);
   readonly statusChanged: boolean;
   createConnection(options: net.NetConnectOpts, cb?: Function): net.Socket;
@@ -25,7 +25,10 @@ interface Constants {
   SOCKET_REQUEST_FINISHED_COUNT: Symbol;
 }
 
-declare class AgentKeepAlive extends HttpAgent {}
+/**
+ * @deprecated instead use `import { HttpAgent } from 'agentkeepalive'; or `const HttpAgent = require('agentkeepalive').HttpAgent;`
+ */
+declare class AgentKeepAlive extends _HttpAgent {}
 
 declare namespace AgentKeepAlive {
   export interface AgentStatus {
@@ -51,6 +54,7 @@ declare namespace AgentKeepAlive {
   export interface HttpOptions extends http.AgentOptions, CommonHttpOption { }
   export interface HttpsOptions extends https.AgentOptions, CommonHttpOption { }
 
+  export class HttpAgent extends _HttpAgent {}
   export class HttpsAgent extends https.Agent {
     constructor(opts?: HttpsOptions);
     readonly statusChanged: boolean;

index.js

@@ -1,5 +1,7 @@
 'use strict';
 
-module.exports = require('./lib/agent');
+const HttpAgent = require('./lib/agent');
+module.exports = HttpAgent;
+module.exports.HttpAgent = HttpAgent;
 module.exports.HttpsAgent = require('./lib/https_agent');
 module.exports.constants = require('./lib/constants');

test/fixtures/agenttest-cert.pem

@@ -1,18 +1,23 @@
 -----BEGIN CERTIFICATE-----
-MIIC+jCCAeKgAwIBAgIJAMuPffHFVqVzMA0GCSqGSIb3DQEBCwUAMGExCzAJBgNV
-BAYTAlNFMRIwEAYDVQQIDAlTdG9ja2hvbG0xEjAQBgNVBAcMCVN0b2NraG9sbTEL
-MAkGA1UEAwwCY2ExHTAbBgkqhkiG9w0BCQEWDmNhQGV4YW1wbGUuY29tMB4XDTE3
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-BH8AAAGHEAAAAAAAAAAAAAAAAAAAAAGCCWxvY2FsaG9zdDAJBgNVHRMEAjAAMAsG
-A1UdDwQEAwIF4DANBgkqhkiG9w0BAQsFAAOCAQEAsD/3f+HO1FJo9kOSitaJV4z7
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-BhtYMKeNMlwZigyJ0k/ygWXRADSzwcSbrhuB/QZoDdxqhinJCTS4OestY1nQoA==
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+hwR/AAABhxAAAAAAAAAAAAAAAAAAAAABgglsb2NhbGhvc3QwCQYDVR0TBAIwADAL
+BgNVHQ8EBAMCBeAwHQYDVR0OBBYEFPp94MOUHtJpzS+9rDjBtyrxEPqgMB8GA1Ud
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+TjiKvg3asb2CwDe3y0fG
 -----END CERTIFICATE-----

test/fixtures/agenttest-key.pem

@@ -1,15 +1,28 @@
------BEGIN RSA PRIVATE KEY-----
-MIICXgIBAAKBgQDlkW4qHfyFy0d892w3zeAzKs15/AOfle0M92fxaYDKEMVf31IL
-ySIeJegsAjfmgWvaQb0VH1O+wpxrkp9bkACiEVr5SeSqq8x6gslNN2xUXADw8BQx
-aw+fuPSHIuTObU0riLI+z42blSDi+KF2eAYqvD/ChhZfYPQbPE7Y+La5jwIDAQAB
-AoGAf4Icb1ZCeUnkRhvjRseZ/LGMeXGpzYznoqkUWblg6FsSVeLjXlp0Ecy6PR9q
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-ooNrBva7VvyuOw+OgQKnXZ4sH37uNkS1KQHDp/x5kZX+DQ==
------END RSA PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCsiKbzm3v7DS8N
+JPCgEIil4Vdt98D0A56HMD+cZqGIuwLvOFOA8XrGJP2rq7HNkv45IjNVwjt+/xRH
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+-----END PRIVATE KEY-----

test/fixtures/ca.key

@@ -1,28 +1,28 @@
 -----BEGIN PRIVATE KEY-----
-MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQDirhR/SK8uxDp3
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+yKupukGvTwKBgQCP05xrIoB2J54r31pfH0gyrZGe0g5W+dYrBX0lydeQivL/SipW
++xh7107pM7IAJFj1zwhqXWoJ6qnSxFKEMfza1cw/5LOncIC0ZC3TAkcIqqSg7ILR
+7/87ysQs4dNSRNbhyaqoDER56q25/fIt5y5uYSat27PRW57G0ly4X5Tu3wKBgGZJ
+A9X/mBrRXely7wtySC5oX9e/bmJBBjz6B7UekCeDPjZKY0pot4MnRR9l1icvYuC4
+3hbOPUrFWx4v/XyPTLLq9F7AvEkg3fJuDhHspdqhxxy0BkFDzCjtBMPgiPkWJ4H2
+BaEAa/B7UtBYZ5Mu8mYE8U0w4tK9mHgiloo43l71AoGBAKJcF1MuHvddV7SzyK7j
+Hf7QdPzsLrPrqH6k9L1yVP1RsouHEgoHh63ot3cZBJEtDodjw9ISoiT4Z1SeGCva
+BSXYYjKlwo6ik6kFdy237VJu7XorEmpzhK+K2hoG7azyVJG3imsKCWHW7N75e+Id
+A+8fxkdCTHA8dB0pk4Rdth1l
 -----END PRIVATE KEY-----

test/fixtures/ca.pem

@@ -1,20 +1,21 @@
 -----BEGIN CERTIFICATE-----
-MIIDPjCCAiYCCQDsuRUq6wfGEDANBgkqhkiG9w0BAQsFADBhMQswCQYDVQQGEwJT
-RTESMBAGA1UECAwJU3RvY2tob2xtMRIwEAYDVQQHDAlTdG9ja2hvbG0xCzAJBgNV
-BAMMAmNhMR0wGwYJKoZIhvcNAQkBFg5jYUBleGFtcGxlLmNvbTAeFw0xNzEwMjAx
-MTM0MDhaFw00NTAzMDYxMTM0MDhaMGExCzAJBgNVBAYTAlNFMRIwEAYDVQQIDAlT
-dG9ja2hvbG0xEjAQBgNVBAcMCVN0b2NraG9sbTELMAkGA1UEAwwCY2ExHTAbBgkq
-hkiG9w0BCQEWDmNhQGV4YW1wbGUuY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A
-MIIBCgKCAQEA4q4Uf0ivLsQ6d6WQDbVdyHkyhcC3QNhusTYKO4rIAhvjp8xDfMyn
-j0i+r0qFCZ2B+SmJjTpTts3NG6q71EFnd++Vgf85dzBIyUtfrWi8cjvpRZau3z6A
-f1eFzvrNJdnAOD8hgJAnIrCebCwiNqGsa245Dj8xwuFtOQo/Er5+ONJH/9n2nh2C
-HYRxlbN+rep2+Xdlp4rz75rnKRTkoYSvixQcS+wECHaHg3aZI3bpE/Qp50U+UtS1
-KukXl844WKoRlPp5p+hqs56T53J2RSEXQULzN2+QS9jS2+Vc4JVGtnzWKmBijRoM
-4/Rv3XqVvEBzsZN1VCUu72mNMz5ZE4DztwIDAQABMA0GCSqGSIb3DQEBCwUAA4IB
-AQAgR8F1/E3slNqbHEk5pLqPw4V0Trk3jB8yNwpkhdpYJKSeAxuX4FdS+vCd1wG6
-V3GG7VR/iQABlH/YQjhqAMGjMhmGbZgvEENr9hRYf6Rp7eEC4gddwn4zq/xv90n6
-/St4V5Ek4/jnTXdwaZFWR1UHiwhYJ4qUYsKR1TiA3nGckKtd52+Veu+xu9DCEOlI
-R2PAKca7bwH+M9GosIV6SJdh+YT3+7hp0d2xUjPvDDXVcb2ezGyxsfDJmXsa0YEt
-V5NvocKipnU2ZYHUvORLix/7OyaHkrsfdwvaFlvRNBKge3F/l+bcs50WhD5daB+g
-bdLER/TWIIcc6x4karOucHS8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 -----END CERTIFICATE-----

test/fixtures/genkey.sh

@@ -6,11 +6,11 @@ openssl req -new -x509 -nodes -days 9999 -config ca.cnf -keyout ca.key -out ca.p
 
 # Generate server key
 # openssl genrsa -out server.key 2048
-openssl genrsa -out agenttest-key.pem 1024 
+openssl genrsa -out agenttest-key.pem 2048
 
 # Generate a certificate signing request for server.key
 # openssl req -new  -key server.key -out server.csr
-openssl req -new -key agenttest-key.pem -out agenttest.csr -config server.cnf 
+openssl req -new -key agenttest-key.pem -out agenttest.csr -config server.cnf
 
 # Sign the csr with the ca certificate, generating server.pem
 openssl x509 -req -extfile server.cnf -days 999 -passin "pass:password" -extensions v3_req -in agenttest.csr -CA ca.pem -CAkey ca.key -CAcreateserial -out agenttest-cert.pem

test/fixtures/ts/index.ts

@@ -1,19 +1,18 @@
-import http from 'http';
-import Agent from '../../..';
-import assert from 'assert';
+import * as http from 'http';
+import { constants, HttpAgent, HttpsAgent, HttpOptions, HttpsOptions, AgentStatus } from '../../..';
+import * as assert from 'assert';
 
-const constants = Agent.constants;
 assert(constants.CREATE_ID);
 assert(constants.CREATE_HTTPS_CONNECTION);
 assert(constants.CURRENT_ID);
 
-const httpOpt: Agent.HttpOptions = {
+const httpOpt: HttpOptions = {
   maxSockets: 100,
   maxFreeSockets: 10,
   timeout: 60000, // active socket keepalive for 60 seconds
   freeSocketTimeout: 30000, // free socket keepalive for 30 seconds
 };
-const keepaliveAgent = new Agent(httpOpt);
+const keepaliveAgent = new HttpAgent(httpOpt);
 
 const options = {
   host: 'cnodejs.org',
@@ -40,19 +39,18 @@ req.end();
 
 setTimeout(() => {
   if (keepaliveAgent.statusChanged) {
-    const httpAgentStatus: Agent.AgentStatus = keepaliveAgent.getCurrentStatus();
+    const httpAgentStatus: AgentStatus = keepaliveAgent.getCurrentStatus();
     console.log('[%s] agent status changed: %j', Date(), httpAgentStatus);
   }
 }, 2000);
 
 // https
-const HttpsAgent = Agent.HttpsAgent;
-const httpsOpt: Agent.HttpsOptions = {
+const httpsOpt: HttpsOptions = {
   maxSockets: 100,
   maxFreeSockets: 10,
   timeout: 60000, // active socket keepalive for 60 seconds
   freeSocketTimeout: 30000, // free socket keepalive for 30 seconds
 };
 const keepaliveHttpsAgent = new HttpsAgent(httpsOpt);
-const httpsAgentStatus: Agent.AgentStatus = keepaliveHttpsAgent.getCurrentStatus();
+const httpsAgentStatus: AgentStatus = keepaliveHttpsAgent.getCurrentStatus();
 assert(httpsAgentStatus);

test/fixtures/ts/tsconfig.json

@@ -21,7 +21,6 @@
     "skipLibCheck": false,
     "skipDefaultLibCheck": false,
     "importHelpers": false,
-    "inlineSourceMap": true,
-    "esModuleInterop": true
+    "inlineSourceMap": true
   }
 }