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urllib

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Help in opening URLs (mostly HTTP) in a complex world — basic and digest authentication, redirections, timeout and more. Base undici API.

213 lines 15.8 kB
import { AsyncLocalStorage } from 'node:async_hooks'; import { debuglog } from 'node:util'; import { fetch as UndiciFetch, Request, getGlobalDispatcher, } from 'undici'; // eslint-disable-next-line @typescript-eslint/ban-ts-comment // @ts-ignore import undiciSymbols from 'undici/lib/core/symbols.js'; // eslint-disable-next-line @typescript-eslint/ban-ts-comment // @ts-ignore import { getResponseState } from 'undici/lib/web/fetch/response.js'; import { channels, } from './HttpClient.js'; import { HttpAgent, } from './HttpAgent.js'; import { initDiagnosticsChannel } from './diagnosticsChannel.js'; import { convertHeader, globalId, performanceTime, updateSocketInfo } from './utils.js'; import symbols from './symbols.js'; import { BaseAgent } from './BaseAgent.js'; const debug = debuglog('urllib/fetch'); export class FetchFactory { static #dispatcher; static #opaqueLocalStorage = new AsyncLocalStorage(); static getDispatcher() { return FetchFactory.#dispatcher ?? getGlobalDispatcher(); } static setDispatcher(dispatcher) { FetchFactory.#dispatcher = dispatcher; } static setClientOptions(clientOptions) { let dispatcherOption = { opaqueLocalStorage: FetchFactory.#opaqueLocalStorage, }; let dispatcherClazz = BaseAgent; if (clientOptions?.lookup || clientOptions?.checkAddress) { dispatcherOption = { ...dispatcherOption, lookup: clientOptions.lookup, checkAddress: clientOptions.checkAddress, connect: clientOptions.connect, allowH2: clientOptions.allowH2, }; dispatcherClazz = HttpAgent; } else if (clientOptions?.connect) { dispatcherOption = { ...dispatcherOption, connect: clientOptions.connect, allowH2: clientOptions.allowH2, }; dispatcherClazz = BaseAgent; } else if (clientOptions?.allowH2) { // Support HTTP2 dispatcherOption = { ...dispatcherOption, allowH2: clientOptions.allowH2, }; dispatcherClazz = BaseAgent; } FetchFactory.#dispatcher = new dispatcherClazz(dispatcherOption); initDiagnosticsChannel(); } static getDispatcherPoolStats() { const agent = FetchFactory.getDispatcher(); // origin => Pool Instance const clients = Reflect.get(agent, undiciSymbols.kClients); const poolStatsMap = {}; if (!clients) { return poolStatsMap; } for (const [key, ref] of clients) { const pool = typeof ref.deref === 'function' ? ref.deref() : ref; const stats = pool?.stats; if (!stats) continue; poolStatsMap[key] = { connected: stats.connected, free: stats.free, pending: stats.pending, queued: stats.queued, running: stats.running, size: stats.size, }; } return poolStatsMap; } static async fetch(input, init) { const requestStartTime = performance.now(); init = init ?? {}; init.dispatcher = init.dispatcher ?? FetchFactory.#dispatcher; const request = new Request(input, init); const requestId = globalId('HttpClientRequest'); // https://developer.chrome.com/docs/devtools/network/reference/?utm_source=devtools#timing-explanation const timing = { // socket assigned queuing: 0, // dns lookup time dnslookup: 0, // socket connected connected: 0, // request headers sent requestHeadersSent: 0, // request sent, including headers and body requestSent: 0, // Time to first byte (TTFB), the response headers have been received waiting: 0, // the response body and trailers have been received contentDownload: 0, }; // using opaque to diagnostics channel, binding request and socket const internalOpaque = { [symbols.kRequestId]: requestId, [symbols.kRequestStartTime]: requestStartTime, [symbols.kEnableRequestTiming]: !!(init.timing ?? true), [symbols.kRequestTiming]: timing, // [symbols.kRequestOriginalOpaque]: originalOpaque, }; const reqMeta = { requestId, url: request.url, args: { method: request.method, type: request.method, data: request.body, headers: convertHeader(request.headers), }, retries: 0, }; const fetchMeta = { requestId, request, }; const socketInfo = { id: 0, localAddress: '', localPort: 0, remoteAddress: '', remotePort: 0, remoteFamily: '', bytesWritten: 0, bytesRead: 0, handledRequests: 0, handledResponses: 0, }; channels.request.publish({ request: reqMeta, }); channels.fetchRequest.publish({ fetch: fetchMeta, }); let res; // keep urllib createCallbackResponse style const resHeaders = {}; const urllibResponse = { status: -1, statusCode: -1, statusText: '', statusMessage: '', headers: resHeaders, size: 0, aborted: false, rt: 0, keepAliveSocket: true, requestUrls: [ request.url, ], timing, socket: socketInfo, retries: 0, socketErrorRetries: 0, }; try { await FetchFactory.#opaqueLocalStorage.run(internalOpaque, async () => { res = await UndiciFetch(request); }); } catch (e) { updateSocketInfo(socketInfo, internalOpaque, e); urllibResponse.rt = performanceTime(requestStartTime); debug('Request#%d throw error: %s', requestId, e); channels.fetchResponse.publish({ fetch: fetchMeta, error: e, }); channels.response.publish({ request: reqMeta, response: urllibResponse, error: e, }); throw e; } // get undici internal response const state = getResponseState(res); updateSocketInfo(socketInfo, internalOpaque); urllibResponse.headers = convertHeader(res.headers); urllibResponse.status = urllibResponse.statusCode = res.status; urllibResponse.statusMessage = res.statusText; if (urllibResponse.headers['content-length']) { urllibResponse.size = parseInt(urllibResponse.headers['content-length']); } urllibResponse.rt = performanceTime(requestStartTime); debug('Request#%d got response, status: %s, headers: %j, timing: %j, socket: %j', requestId, urllibResponse.status, urllibResponse.headers, timing, urllibResponse.socket); channels.fetchResponse.publish({ fetch: fetchMeta, timingInfo: state.timingInfo, response: res, }); channels.response.publish({ request: reqMeta, response: urllibResponse, }); return res; } } export const fetch = FetchFactory.fetch; //# 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