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import net from 'net'; import http from 'http'; import https from 'https'; import { Duplex } from 'stream'; import { EventEmitter } from 'events'; import createDebug from 'debug'; import promisify from './promisify'; const debug = createDebug('agent-base'); function isAgent(v: any): v is createAgent.AgentLike { return Boolean(v) && typeof v.addRequest === 'function'; } function isSecureEndpoint(): boolean { const { stack } = new Error(); if (typeof stack !== 'string') return false; return stack.split('\n').some(l => l.indexOf('(https.js:') !== -1 || l.indexOf('node:https:') !== -1); } function createAgent(opts?: createAgent.AgentOptions): createAgent.Agent; function createAgent( callback: createAgent.AgentCallback, opts?: createAgent.AgentOptions ): createAgent.Agent; function createAgent( callback?: createAgent.AgentCallback | createAgent.AgentOptions, opts?: createAgent.AgentOptions ) { return new createAgent.Agent(callback, opts); } namespace createAgent { export interface ClientRequest extends http.ClientRequest { _last?: boolean; _hadError?: boolean; method: string; } export interface AgentRequestOptions { host?: string; path?: string; // `port` on `http.RequestOptions` can be a string or undefined, // but `net.TcpNetConnectOpts` expects only a number port: number; } export interface HttpRequestOptions extends AgentRequestOptions, Omit<http.RequestOptions, keyof AgentRequestOptions> { secureEndpoint: false; } export interface HttpsRequestOptions extends AgentRequestOptions, Omit<https.RequestOptions, keyof AgentRequestOptions> { secureEndpoint: true; } export type RequestOptions = HttpRequestOptions | HttpsRequestOptions; export type AgentLike = Pick<createAgent.Agent, 'addRequest'> | http.Agent; export type AgentCallbackReturn = Duplex | AgentLike; export type AgentCallbackCallback = ( err?: Error | null, socket?: createAgent.AgentCallbackReturn ) => void; export type AgentCallbackPromise = ( req: createAgent.ClientRequest, opts: createAgent.RequestOptions ) => | createAgent.AgentCallbackReturn | Promise<createAgent.AgentCallbackReturn>; export type AgentCallback = typeof Agent.prototype.callback; export type AgentOptions = { timeout?: number; }; /** * Base `http.Agent` implementation. * No pooling/keep-alive is implemented by default. * * @param {Function} callback * @api public */ export class Agent extends EventEmitter { public timeout: number | null; public maxFreeSockets: number; public maxTotalSockets: number; public maxSockets: number; public sockets: { [key: string]: net.Socket[]; }; public freeSockets: { [key: string]: net.Socket[]; }; public requests: { [key: string]: http.IncomingMessage[]; }; public options: https.AgentOptions; private promisifiedCallback?: createAgent.AgentCallbackPromise; private explicitDefaultPort?: number; private explicitProtocol?: string; constructor( callback?: createAgent.AgentCallback | createAgent.AgentOptions, _opts?: createAgent.AgentOptions ) { super(); let opts = _opts; if (typeof callback === 'function') { this.callback = callback; } else if (callback) { opts = callback; } // Timeout for the socket to be returned from the callback this.timeout = null; if (opts && typeof opts.timeout === 'number') { this.timeout = opts.timeout; } // These aren't actually used by `agent-base`, but are required // for the TypeScript definition files in `@types/node` :/ this.maxFreeSockets = 1; this.maxSockets = 1; this.maxTotalSockets = Infinity; this.sockets = {}; this.freeSockets = {}; this.requests = {}; this.options = {}; } get defaultPort(): number { if (typeof this.explicitDefaultPort === 'number') { return this.explicitDefaultPort; } return isSecureEndpoint() ? 443 : 80; } set defaultPort(v: number) { this.explicitDefaultPort = v; } get protocol(): string { if (typeof this.explicitProtocol === 'string') { return this.explicitProtocol; } return isSecureEndpoint() ? 'https:' : 'http:'; } set protocol(v: string) { this.explicitProtocol = v; } callback( req: createAgent.ClientRequest, opts: createAgent.RequestOptions, fn: createAgent.AgentCallbackCallback ): void; callback( req: createAgent.ClientRequest, opts: createAgent.RequestOptions ): | createAgent.AgentCallbackReturn | Promise<createAgent.AgentCallbackReturn>; callback( req: createAgent.ClientRequest, opts: createAgent.AgentOptions, fn?: createAgent.AgentCallbackCallback ): | createAgent.AgentCallbackReturn | Promise<createAgent.AgentCallbackReturn> | void { throw new Error( '"agent-base" has no default implementation, you must subclass and override `callback()`' ); } /** * Called by node-core's "_http_client.js" module when creating * a new HTTP request with this Agent instance. * * @api public */ addRequest(req: ClientRequest, _opts: RequestOptions): void { const opts: RequestOptions = { ..._opts }; if (typeof opts.secureEndpoint !== 'boolean') { opts.secureEndpoint = isSecureEndpoint(); } if (opts.host == null) { opts.host = 'localhost'; } if (opts.port == null) { opts.port = opts.secureEndpoint ? 443 : 80; } if (opts.protocol == null) { opts.protocol = opts.secureEndpoint ? 'https:' : 'http:'; } if (opts.host && opts.path) { // If both a `host` and `path` are specified then it's most // likely the result of a `url.parse()` call... we need to // remove the `path` portion so that `net.connect()` doesn't // attempt to open that as a unix socket file. delete opts.path; } delete opts.agent; delete opts.hostname; delete opts._defaultAgent; delete opts.defaultPort; delete opts.createConnection; // Hint to use "Connection: close" // XXX: non-documented `http` module API :( req._last = true; req.shouldKeepAlive = false; let timedOut = false; let timeoutId: ReturnType<typeof setTimeout> | null = null; const timeoutMs = opts.timeout || this.timeout; const onerror = (err: NodeJS.ErrnoException) => { if (req._hadError) return; req.emit('error', err); // For Safety. Some additional errors might fire later on // and we need to make sure we don't double-fire the error event. req._hadError = true; }; const ontimeout = () => { timeoutId = null; timedOut = true; const err: NodeJS.ErrnoException = new Error( `A "socket" was not created for HTTP request before ${timeoutMs}ms` ); err.code = 'ETIMEOUT'; onerror(err); }; const callbackError = (err: NodeJS.ErrnoException) => { if (timedOut) return; if (timeoutId !== null) { clearTimeout(timeoutId); timeoutId = null; } onerror(err); }; const onsocket = (socket: AgentCallbackReturn) => { if (timedOut) return; if (timeoutId != null) { clearTimeout(timeoutId); timeoutId = null; } if (isAgent(socket)) { // `socket` is actually an `http.Agent` instance, so // relinquish responsibility for this `req` to the Agent // from here on debug( 'Callback returned another Agent instance %o', socket.constructor.name ); (socket as createAgent.Agent).addRequest(req, opts); return; } if (socket) { socket.once('free', () => { this.freeSocket(socket as net.Socket, opts); }); req.onSocket(socket as net.Socket); return; } const err = new Error( `no Duplex stream was returned to agent-base for \`${req.method} ${req.path}\`` ); onerror(err); }; if (typeof this.callback !== 'function') { onerror(new Error('`callback` is not defined')); return; } if (!this.promisifiedCallback) { if (this.callback.length >= 3) { debug('Converting legacy callback function to promise'); this.promisifiedCallback = promisify(this.callback); } else { this.promisifiedCallback = this.callback; } } if (typeof timeoutMs === 'number' && timeoutMs > 0) { timeoutId = setTimeout(ontimeout, timeoutMs); } if ('port' in opts && typeof opts.port !== 'number') { opts.port = Number(opts.port); } try { debug( 'Resolving socket for %o request: %o', opts.protocol, `${req.method} ${req.path}` ); Promise.resolve(this.promisifiedCallback(req, opts)).then( onsocket, callbackError ); } catch (err) { Promise.reject(err).catch(callbackError); } } freeSocket(socket: net.Socket, opts: AgentOptions) { debug('Freeing socket %o %o', socket.constructor.name, opts); socket.destroy(); } destroy() { debug('Destroying agent %o', this.constructor.name); } } // So that `instanceof` works correctly createAgent.prototype = createAgent.Agent.prototype; } export = createAgent;
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