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| 1 | +import { CoreOptions } from "request"; |
| 2 | +import request from "@magda/typescript-common/dist/request"; |
| 3 | +import * as http from "http"; |
| 4 | +import DevNull from "./DevNull"; |
| 5 | + |
| 6 | +/** |
| 7 | + * Depends on statusCode, determine a request is failed or not |
| 8 | + * @param response http.IncomingMessage |
| 9 | + */ |
| 10 | +function processResponse(response: http.IncomingMessage) { |
| 11 | + if ( |
| 12 | + (response.statusCode >= 200 && response.statusCode <= 299) || |
| 13 | + response.statusCode === 429 |
| 14 | + ) { |
| 15 | + return response.statusCode; |
| 16 | + } else { |
| 17 | + throw new BadHttpResponseError( |
| 18 | + response.statusMessage, |
| 19 | + response, |
| 20 | + response.statusCode |
| 21 | + ); |
| 22 | + } |
| 23 | +} |
| 24 | + |
| 25 | +/** |
| 26 | + * Send head request to the URL |
| 27 | + * Received data will be discarded |
| 28 | + * @param url String: url to be tested |
| 29 | + */ |
| 30 | +export async function headRequest( |
| 31 | + url: string, |
| 32 | + requestOpts: CoreOptions = {} |
| 33 | +): Promise<number> { |
| 34 | + return doRequest(url, "head", requestOpts); |
| 35 | +} |
| 36 | + |
| 37 | +/** |
| 38 | + * Send head request to the URL |
| 39 | + * Received data will be discarded |
| 40 | + * @param url String: url to be tested |
| 41 | + */ |
| 42 | +export async function getRequest( |
| 43 | + url: string, |
| 44 | + requestOpts: CoreOptions = {} |
| 45 | +): Promise<number> { |
| 46 | + return doRequest(url, "get", { |
| 47 | + ...requestOpts, |
| 48 | + headers: { |
| 49 | + Range: "bytes=0-50" |
| 50 | + } |
| 51 | + }); |
| 52 | +} |
| 53 | + |
| 54 | +/** |
| 55 | + * Send request to the URL |
| 56 | + * Received data will be discarded |
| 57 | + * @param url String: url to be tested |
| 58 | + */ |
| 59 | +export async function doRequest( |
| 60 | + url: string, |
| 61 | + method: "get" | "head", |
| 62 | + requestOpts: CoreOptions = {} |
| 63 | +): Promise<number> { |
| 64 | + const devnull = new DevNull(); |
| 65 | + console.info(`${method} ${url}`); |
| 66 | + |
| 67 | + let resolveResponse: (number: number) => void; |
| 68 | + let resolveStreamEnd: () => void; |
| 69 | + let rejectResponse: (error: Error) => void; |
| 70 | + let rejectStreamEnd: (error: Error) => void; |
| 71 | + |
| 72 | + const reqPromise: Promise<number> = new Promise((resolve, reject) => { |
| 73 | + resolveResponse = resolve; |
| 74 | + rejectResponse = reject; |
| 75 | + }); |
| 76 | + |
| 77 | + const streamPromise = new Promise((resolve, reject) => { |
| 78 | + rejectStreamEnd = reject; |
| 79 | + resolveStreamEnd = resolve; |
| 80 | + }); |
| 81 | + |
| 82 | + const req = request[method](url, requestOpts) |
| 83 | + .on("error", err => rejectResponse(err)) |
| 84 | + .on("response", (response: http.IncomingMessage) => { |
| 85 | + try { |
| 86 | + console.info( |
| 87 | + `Got ${response.statusCode} from ${method} ${url}` |
| 88 | + ); |
| 89 | + |
| 90 | + resolveResponse(processResponse(response)); |
| 91 | + } catch (e) { |
| 92 | + rejectResponse(e); |
| 93 | + } |
| 94 | + }) |
| 95 | + .on("end", () => { |
| 96 | + resolveStreamEnd(); |
| 97 | + }); |
| 98 | + |
| 99 | + req.pipe(devnull).on("error", rejectStreamEnd); |
| 100 | + req.on("error", rejectStreamEnd); |
| 101 | + |
| 102 | + const [responseCode] = await Promise.all([reqPromise, streamPromise]); |
| 103 | + |
| 104 | + return responseCode; |
| 105 | +} |
| 106 | + |
| 107 | +export class BadHttpResponseError extends Error { |
| 108 | + public response: http.IncomingMessage; |
| 109 | + public httpStatusCode: number; |
| 110 | + |
| 111 | + constructor( |
| 112 | + message?: string, |
| 113 | + response?: http.IncomingMessage, |
| 114 | + httpStatusCode?: number |
| 115 | + ) { |
| 116 | + super(message); |
| 117 | + this.message = message; |
| 118 | + this.response = response; |
| 119 | + this.httpStatusCode = httpStatusCode; |
| 120 | + this.stack = new Error().stack; |
| 121 | + } |
| 122 | +} |
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