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revisited parsing of http requests & responses using HttpMirror
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| const http = require('http'); | ||
| const net = require('net'); | ||
|
|
||
| const {STRINGS} = require('../lib/constants'); | ||
| const {CRLF, TRANSFER_ENCODING, CONTENT_LENGTH, CHUNKED, ZERO} = STRINGS; | ||
|
|
||
| module.exports = class HttpMirror { | ||
| constructor(session) { | ||
| this.server = http.createServer(); | ||
| // this.client = http.request; | ||
| this.isListening = false; | ||
| this._session = session; | ||
| this._mirror = { | ||
| server: {request: false, response: false}, | ||
| client: {request: false, response: false} | ||
| }; | ||
| } | ||
|
|
||
| async close() { | ||
| return new Promise((resolve) => { | ||
| if (this.isListening) { | ||
| this.server.close(resolve); | ||
| return true; | ||
| } | ||
| resolve(false); | ||
| return false; | ||
| }); | ||
|
|
||
| } | ||
|
|
||
| listen() { | ||
| return new Promise((resolve, reject) => { | ||
| if (this.isListening) { | ||
| resolve(true); | ||
| return; | ||
| } | ||
| //starting http-server on random port | ||
| this.server.listen(0, 'localhost', () => { | ||
| this.isListening = true; | ||
| resolve(true); | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| waitForRequest(data) { | ||
| const session = this._session; | ||
|
|
||
| return new Promise(async (resolve) => { | ||
| const serverInfo = this.server.address(); | ||
| const config = {host: serverInfo.address, port: serverInfo.port}; | ||
|
|
||
| if (!this._mirror?.client?.request) { | ||
| this._mirror.client.request = net.createConnection(config); | ||
|
|
||
| this.server | ||
| .once('connect', (request, clientSocket) => { | ||
| const {method, url, headers, httpVersion, trailers} = request; | ||
| this._mirror.client.request = false; | ||
| clientSocket.destroy(); | ||
| resolve({method, url, headers, httpVersion, trailers}); | ||
| }) | ||
| .once('request', (request, response) => { | ||
| this._mirror.client.requesthandler = request; | ||
| this._mirror.client.response = response; | ||
| const {method, url, headers, httpVersion, trailers} = request; | ||
|
|
||
| request.on('data', (chunk) => { | ||
| session._requestCounter++; | ||
| session._rawRequestBodyChunks.push(chunk); | ||
| }) | ||
| .once('data', () => { | ||
| resolve({method, url, headers, httpVersion, trailers}); | ||
| }) | ||
| .once('end', () => { | ||
| this._mirror.client.response.end(); | ||
| this._mirror.client.request.destroy(); | ||
| this._mirror.client.requesthandler.destroy(); | ||
| session._request.complete = true; | ||
| resolve({method, url, headers, httpVersion, trailers}); | ||
| }); | ||
| }); | ||
| return this._mirror.client.request.write(data); | ||
| } | ||
| else { | ||
| const {method, url, headers, httpVersion, trailers} = this._mirror.client.requestHandler; | ||
|
|
||
| this._mirror.client.requestHandler | ||
| .once('data', () => { | ||
| resolve({method, url, headers, httpVersion, trailers}); | ||
| }) | ||
| .once('end', () => { | ||
| resolve({method, url, headers, httpVersion, trailers}); | ||
| }); | ||
| return this._mirror.client.request.write(data); | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| waitForResponse(data) { | ||
| const session = this._session; | ||
| return new Promise((resolve) => { | ||
| if (!this._mirror?.server?.response) { | ||
| this.server.once('request', (request, response) => { | ||
| this._mirror.server.response = response; | ||
| response.socket.write(data); //dumping TCP data | ||
| }); | ||
|
|
||
| const {address, port} = this.server.address(); | ||
| const request = session._request; | ||
| const options = {method: request.method, headers: request.headers, path: '/', host: address, port}; | ||
| delete options.headers.host; | ||
|
|
||
| http.request(options, (response) => { | ||
| const {headers, httpVersion, statusCode} = response; | ||
| this._mirror.server.request = response; | ||
|
|
||
| response | ||
| .on('data', (chunk) => { | ||
| session._responseCounter++; | ||
| session._rawResponseBodyChunks.push(chunk); | ||
| if (headers?.[CONTENT_LENGTH]) { | ||
| const bodyBytes = Buffer.byteLength(session.rawResponse); | ||
| session._response.complete = parseInt(headers[CONTENT_LENGTH]) <= bodyBytes; | ||
| } | ||
| }) | ||
| .once('data', (chunk) => { | ||
| resolve({headers, httpVersion, statusCode}); | ||
| }) | ||
| .once('close', async () => { | ||
| session._response.complete = true; | ||
| this._mirror?.server?.request?.destroy(); | ||
| this._mirror?.server?.response?.end(); | ||
| await this.close(); //closing this instance at the end of response | ||
| resolve({headers, httpVersion, statusCode}); | ||
| }); | ||
|
|
||
| setTimeout(() => { | ||
| resolve({headers, httpVersion, statusCode}); //resolving in case of no data after 10ms | ||
| }, 10); | ||
| }) | ||
| .end(); | ||
| } | ||
| else { | ||
| const {headers, httpVersion, statusCode} = this._mirror.server.request; | ||
| this._mirror.server.request | ||
| .once('data', () => { | ||
| resolve({headers, httpVersion, statusCode}); | ||
| }) | ||
| .once('close', () => { | ||
| resolve({headers, httpVersion, statusCode}); | ||
| }); | ||
| return this._mirror.server.response.socket.write(data); //dumping TCP data to existing response-Object | ||
| } | ||
| }); | ||
| } | ||
| }; |
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