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test-http-agent-keepalive.js
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test-http-agent-keepalive.js
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'use strict';
const common = require('../common');
const assert = require('assert');
const http = require('http');
const Agent = require('_http_agent').Agent;
let name;
const agent = new Agent({
keepAlive: true,
keepAliveMsecs: 1000,
maxSockets: 5,
maxFreeSockets: 5
});
const server = http.createServer(common.mustCall((req, res) => {
if (req.url === '/error') {
res.destroy();
return;
} else if (req.url === '/remote_close') {
// cache the socket, close it after a short delay
const socket = res.connection;
setImmediate(common.mustCall(() => socket.end()));
}
res.end('hello world');
}, 4));
function get(path, callback) {
return http.get({
host: 'localhost',
port: server.address().port,
agent: agent,
path: path
}, callback);
}
function checkDataAndSockets(body) {
assert.strictEqual(body.toString(), 'hello world');
assert.strictEqual(agent.sockets[name].length, 1);
assert.strictEqual(agent.freeSockets[name], undefined);
}
function second() {
// request second, use the same socket
get('/second', common.mustCall((res) => {
assert.strictEqual(res.statusCode, 200);
res.on('data', checkDataAndSockets);
res.on('end', common.mustCall(() => {
assert.strictEqual(agent.sockets[name].length, 1);
assert.strictEqual(agent.freeSockets[name], undefined);
process.nextTick(common.mustCall(() => {
assert.strictEqual(agent.sockets[name], undefined);
assert.strictEqual(agent.freeSockets[name].length, 1);
remoteClose();
}));
}));
}));
}
function remoteClose() {
// mock remote server close the socket
get('/remote_close', common.mustCall((res) => {
assert.deepStrictEqual(res.statusCode, 200);
res.on('data', checkDataAndSockets);
res.on('end', common.mustCall(() => {
assert.strictEqual(agent.sockets[name].length, 1);
assert.strictEqual(agent.freeSockets[name], undefined);
process.nextTick(common.mustCall(() => {
assert.strictEqual(agent.sockets[name], undefined);
assert.strictEqual(agent.freeSockets[name].length, 1);
// waiting remote server close the socket
setTimeout(common.mustCall(() => {
assert.strictEqual(agent.sockets[name], undefined);
assert.strictEqual(agent.freeSockets[name], undefined,
'freeSockets is not empty');
remoteError();
}), common.platformTimeout(200));
}));
}));
}));
}
function remoteError() {
// remote server will destroy the socket
const req = get('/error', common.mustNotCall());
req.on('error', common.mustCall((err) => {
assert(err);
assert.strictEqual(err.message, 'socket hang up');
assert.strictEqual(agent.sockets[name].length, 1);
assert.strictEqual(agent.freeSockets[name], undefined);
// Wait socket 'close' event emit
setTimeout(common.mustCall(() => {
assert.strictEqual(agent.sockets[name], undefined);
assert.strictEqual(agent.freeSockets[name], undefined);
server.close();
}), common.platformTimeout(1));
}));
}
server.listen(0, common.mustCall(() => {
name = `localhost:${server.address().port}:`;
// request first, and keep alive
get('/first', common.mustCall((res) => {
assert.strictEqual(res.statusCode, 200);
res.on('data', checkDataAndSockets);
res.on('end', common.mustCall(() => {
assert.strictEqual(agent.sockets[name].length, 1);
assert.strictEqual(agent.freeSockets[name], undefined);
process.nextTick(common.mustCall(() => {
assert.strictEqual(agent.sockets[name], undefined);
assert.strictEqual(agent.freeSockets[name].length, 1);
second();
}));
}));
}));
}));