urllib
Version:
Help in opening URLs (mostly HTTP) in a complex world — basic and digest authentication, redirections, cookies and more. Base undici fetch API.
127 lines • 6.77 kB
JavaScript
import diagnosticsChannel from 'diagnostics_channel';
import { performance } from 'perf_hooks';
import { debuglog } from 'util';
import symbols from './symbols.js';
import { globalId, performanceTime } from './utils.js';
const debug = debuglog('urllib:DiagnosticsChannel');
let initedDiagnosticsChannel = false;
// https://undici.nodejs.org/#/docs/api/DiagnosticsChannel
// client --> server
// undici:request:create => { request }
// -> [optional] undici:client:connected => { socket } [first request will create socket]
// -> undici:client:sendHeaders => { socket, request }
// -> undici:request:bodySent => { request }
//
// server --> client
// undici:request:headers => { request, response }
// -> undici:request:trailers => { request, trailers }
export function initDiagnosticsChannel() {
// makre sure init global DiagnosticsChannel once
if (initedDiagnosticsChannel)
return;
initedDiagnosticsChannel = true;
let kHandler;
// This message is published when a new outgoing request is created.
// Note: a request is only loosely completed to a given socket.
diagnosticsChannel.channel('undici:request:create').subscribe((message, name) => {
var _a, _b;
const { request } = message;
if (!kHandler) {
const symbols = Object.getOwnPropertySymbols(request);
for (const symbol of symbols) {
if (symbol.description === 'handler') {
kHandler = symbol;
break;
}
}
}
const opaque = (_b = (_a = request[kHandler]) === null || _a === void 0 ? void 0 : _a.opts) === null || _b === void 0 ? void 0 : _b.opaque;
// ignore non HttpClient Request
if (!opaque || !opaque[symbols.kRequestId])
return;
debug('[%s] Request#%d %s %s, path: %s', name, opaque[symbols.kRequestId], request.method, request.origin, request.path);
if (!opaque[symbols.kEnableRequestTiming])
return;
opaque[symbols.kRequestTiming].queuing = performanceTime(opaque[symbols.kRequestStartTime]);
});
// diagnosticsChannel.channel('undici:client:beforeConnect')
// diagnosticsChannel.channel('undici:client:connectError')
// This message is published after a connection is established.
diagnosticsChannel.channel('undici:client:connected').subscribe((message, name) => {
const { socket } = message;
socket[symbols.kSocketId] = globalId('UndiciSocket');
socket[symbols.kSocketStartTime] = performance.now();
socket[symbols.kHandledRequests] = 0;
socket[symbols.kHandledResponses] = 0;
debug('[%s] Socket#%d connected', name, socket[symbols.kSocketId]);
});
// This message is published right before the first byte of the request is written to the socket.
diagnosticsChannel.channel('undici:client:sendHeaders').subscribe((message, name) => {
var _a, _b;
const { request, socket } = message;
if (!kHandler)
return;
const opaque = (_b = (_a = request[kHandler]) === null || _a === void 0 ? void 0 : _a.opts) === null || _b === void 0 ? void 0 : _b.opaque;
if (!opaque || !opaque[symbols.kRequestId])
return;
socket[symbols.kHandledRequests]++;
// attach socket to opaque
opaque[symbols.kRequestSocket] = socket;
debug('[%s] Request#%d send headers on Socket#%d (handled %d requests)', name, opaque[symbols.kRequestId], socket[symbols.kSocketId], socket[symbols.kHandledRequests]);
if (!opaque[symbols.kEnableRequestTiming])
return;
opaque[symbols.kRequestTiming].requestHeadersSent = performanceTime(opaque[symbols.kRequestStartTime]);
// first socket need to caculate the connected time
if (socket[symbols.kHandledRequests] === 1) {
// kSocketStartTime - kRequestStartTime = connected time
opaque[symbols.kRequestTiming].connected =
performanceTime(opaque[symbols.kRequestStartTime], socket[symbols.kSocketStartTime]);
}
});
diagnosticsChannel.channel('undici:request:bodySent').subscribe((message, name) => {
var _a, _b;
const { request } = message;
if (!kHandler)
return;
const opaque = (_b = (_a = request[kHandler]) === null || _a === void 0 ? void 0 : _a.opts) === null || _b === void 0 ? void 0 : _b.opaque;
if (!opaque || !opaque[symbols.kRequestId])
return;
debug('[%s] Request#%d send body', name, opaque[symbols.kRequestId]);
if (!opaque[symbols.kEnableRequestTiming])
return;
opaque[symbols.kRequestTiming].requestSent = performanceTime(opaque[symbols.kRequestStartTime]);
});
// This message is published after the response headers have been received, i.e. the response has been completed.
diagnosticsChannel.channel('undici:request:headers').subscribe((message, name) => {
var _a, _b;
const { request, response } = message;
if (!kHandler)
return;
const opaque = (_b = (_a = request[kHandler]) === null || _a === void 0 ? void 0 : _a.opts) === null || _b === void 0 ? void 0 : _b.opaque;
if (!opaque || !opaque[symbols.kRequestId])
return;
// get socket from opaque
const socket = opaque[symbols.kRequestSocket];
socket[symbols.kHandledResponses]++;
debug('[%s] Request#%d get %s response headers on Socket#%d (handled %d responses)', name, opaque[symbols.kRequestId], response.statusCode, socket[symbols.kSocketId], socket[symbols.kHandledResponses]);
if (!opaque[symbols.kEnableRequestTiming])
return;
opaque[symbols.kRequestTiming].waiting = performanceTime(opaque[symbols.kRequestStartTime]);
});
// This message is published after the response body and trailers have been received, i.e. the response has been completed.
diagnosticsChannel.channel('undici:request:trailers').subscribe((message, name) => {
var _a, _b;
const { request } = message;
if (!kHandler)
return;
const opaque = (_b = (_a = request[kHandler]) === null || _a === void 0 ? void 0 : _a.opts) === null || _b === void 0 ? void 0 : _b.opaque;
if (!opaque || !opaque[symbols.kRequestId])
return;
debug('[%s] Request#%d get response body and trailers', name, opaque[symbols.kRequestId]);
if (!opaque[symbols.kEnableRequestTiming])
return;
opaque[symbols.kRequestTiming].contentDownload = performanceTime(opaque[symbols.kRequestStartTime]);
});
// diagnosticsChannel.channel('undici:request:error')
}
//# sourceMappingURL=diagnosticsChannel.js.map