/
agents.ts
71 lines (60 loc) · 2 KB
/
agents.ts
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/*!
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {Agent as HTTPAgent} from 'http';
import {Agent as HTTPSAgent} from 'https';
import {parse} from 'url';
import {Options} from './';
export const pool = new Map<string, HTTPAgent>();
export type HttpAnyAgent = HTTPAgent | HTTPSAgent;
/**
* Returns a custom request Agent if one is found, otherwise returns undefined
* which will result in the global http(s) Agent being used.
* @private
* @param {string} uri The request uri
* @param {Options} reqOpts The request options
* @returns {HttpAnyAgent|undefined}
*/
export function getAgent(
uri: string,
reqOpts: Options
): HttpAnyAgent | undefined {
const isHttp = uri.startsWith('http://');
const proxy =
reqOpts.proxy ||
process.env.HTTP_PROXY ||
process.env.http_proxy ||
process.env.HTTPS_PROXY ||
process.env.https_proxy;
const poolOptions = Object.assign({}, reqOpts.pool);
if (proxy) {
// tslint:disable-next-line variable-name
const Agent = isHttp
? require('http-proxy-agent')
: require('https-proxy-agent');
const proxyOpts = {...parse(proxy), ...poolOptions};
return new Agent(proxyOpts);
}
let key = isHttp ? 'http' : 'https';
if (reqOpts.forever) {
key += ':forever';
if (!pool.has(key)) {
// tslint:disable-next-line variable-name
const Agent = isHttp ? HTTPAgent : HTTPSAgent;
pool.set(key, new Agent({...poolOptions, keepAlive: true}));
}
}
return pool.get(key);
}